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The following commit(s) were added to refs/heads/asf-site by this push:
new c27e45139 Publishing web: 9908cfdaeea2c4a523a0ce7bec4c19981b4dc146
docs: d598f97746efc5179621b35729dad09f83b1ef57
c27e45139 is described below
commit c27e451394366d0b5693a14a07e7713af96d84a0
Author: Matteo Golin <[email protected]>
AuthorDate: Thu Oct 2 00:32:40 2025 +0000
Publishing web: 9908cfdaeea2c4a523a0ce7bec4c19981b4dc146 docs:
d598f97746efc5179621b35729dad09f83b1ef57
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index 60b41b114..32dcd545a 100644
--- a/content/docs/10.0.0/index.html
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-<p>Last Updated: 01 October 25 at 00:17</p>
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<p class="caption" role="heading"><span class="caption-text">Table of
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for functionality that is not appropriate for deeply-embedded environments
(such as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:19</p>
+<p>Last Updated: 02 October 25 at 00:17</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.3.0/searchindex.js
b/content/docs/12.3.0/searchindex.js
index b50520513..829bd6452 100644
--- a/content/docs/12.3.0/searchindex.js
+++ b/content/docs/12.3.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/index",
"applications/nsh/builtin", "applications/nsh/commands",
"applications/nsh/config", "applications/nsh/customizing",
"applications/nsh/index", "applications/nsh/installation",
"applications/nsh/login", "applications/nsh/nsh", "applications/nxdiag/config",
"applications/nxdiag/index", "applications/wapi/commands",
"applications/wapi/index", "applications/wapi/wireless", "components/binfmt",
"components/drivers/block/index", "components/dr [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/index",
"applications/nsh/builtin", "applications/nsh/commands",
"applications/nsh/config", "applications/nsh/customizing",
"applications/nsh/index", "applications/nsh/installation",
"applications/nsh/login", "applications/nsh/nsh", "applications/nxdiag/config",
"applications/nxdiag/index", "applications/wapi/commands",
"applications/wapi/index", "applications/wapi/wireless", "components/binfmt",
"components/drivers/block/index", "components/dr [...]
\ No newline at end of file
diff --git a/content/docs/12.4.0/index.html b/content/docs/12.4.0/index.html
index ffc8f1a99..0c11444fa 100644
--- a/content/docs/12.4.0/index.html
+++ b/content/docs/12.4.0/index.html
@@ -179,7 +179,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:20</p>
+<p>Last Updated: 02 October 25 at 00:17</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.4.0/searchindex.js
b/content/docs/12.4.0/searchindex.js
index bea7966a6..f622ec7b6 100644
--- a/content/docs/12.4.0/searchindex.js
+++ b/content/docs/12.4.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/coremark/index", "applications/benchmarks/index",
"applications/boot/index", "applications/boot/mcuboot/index",
"applications/boot/miniboot/index", "applications/canutils/candump/index",
"applications/canutils/canlib/index", "applications/canutils/cansend/index",
"applications/c [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/coremark/index", "applications/benchmarks/index",
"applications/boot/index", "applications/boot/mcuboot/index",
"applications/boot/miniboot/index", "applications/canutils/candump/index",
"applications/canutils/canlib/index", "applications/canutils/cansend/index",
"applications/c [...]
\ No newline at end of file
diff --git a/content/docs/12.5.0/index.html b/content/docs/12.5.0/index.html
index f5cd5bad0..5241948c9 100644
--- a/content/docs/12.5.0/index.html
+++ b/content/docs/12.5.0/index.html
@@ -179,7 +179,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:21</p>
+<p>Last Updated: 02 October 25 at 00:19</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.5.0/searchindex.js
b/content/docs/12.5.0/searchindex.js
index 37654167c..6c1e2ba0a 100644
--- a/content/docs/12.5.0/searchindex.js
+++ b/content/docs/12.5.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/coremark/index", "applications/benchmarks/index",
"applications/boot/index", "applications/boot/mcuboot/index",
"applications/boot/miniboot/index", "applications/canutils/candump/index",
"applications/canutils/canlib/index", "applications/canutils/cansend/index",
"applications/c [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/coremark/index", "applications/benchmarks/index",
"applications/boot/index", "applications/boot/mcuboot/index",
"applications/boot/miniboot/index", "applications/canutils/candump/index",
"applications/canutils/canlib/index", "applications/canutils/cansend/index",
"applications/c [...]
\ No newline at end of file
diff --git a/content/docs/12.5.1/index.html b/content/docs/12.5.1/index.html
index 515797676..42134d4d7 100644
--- a/content/docs/12.5.1/index.html
+++ b/content/docs/12.5.1/index.html
@@ -179,7 +179,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:23</p>
+<p>Last Updated: 02 October 25 at 00:20</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.5.1/searchindex.js
b/content/docs/12.5.1/searchindex.js
index a5e24ba6b..bfdeafcc3 100644
--- a/content/docs/12.5.1/searchindex.js
+++ b/content/docs/12.5.1/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/coremark/index", "applications/benchmarks/index",
"applications/boot/index", "applications/boot/mcuboot/index",
"applications/boot/miniboot/index", "applications/canutils/candump/index",
"applications/canutils/canlib/index", "applications/canutils/cansend/index",
"applications/c [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/coremark/index", "applications/benchmarks/index",
"applications/boot/index", "applications/boot/mcuboot/index",
"applications/boot/miniboot/index", "applications/canutils/candump/index",
"applications/canutils/canlib/index", "applications/canutils/cansend/index",
"applications/c [...]
\ No newline at end of file
diff --git a/content/docs/12.6.0/index.html b/content/docs/12.6.0/index.html
index deacb633c..9b3e3ccbc 100644
--- a/content/docs/12.6.0/index.html
+++ b/content/docs/12.6.0/index.html
@@ -180,7 +180,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:24</p>
+<p>Last Updated: 02 October 25 at 00:21</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.6.0/searchindex.js
b/content/docs/12.6.0/searchindex.js
index 48a6efe0d..5ccc050d9 100644
--- a/content/docs/12.6.0/searchindex.js
+++ b/content/docs/12.6.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/benchmarks/iozone/index",
"applications/bench [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/benchmarks/iozone/index",
"applications/bench [...]
\ No newline at end of file
diff --git a/content/docs/12.7.0/index.html b/content/docs/12.7.0/index.html
index d03e906a1..c77fb243c 100644
--- a/content/docs/12.7.0/index.html
+++ b/content/docs/12.7.0/index.html
@@ -179,7 +179,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:25</p>
+<p>Last Updated: 02 October 25 at 00:23</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.7.0/searchindex.js
b/content/docs/12.7.0/searchindex.js
index 704b68032..ebb10fbe1 100644
--- a/content/docs/12.7.0/searchindex.js
+++ b/content/docs/12.7.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/benchmarks/iozone/index",
"applications/bench [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/benchmarks/iozone/index",
"applications/bench [...]
\ No newline at end of file
diff --git a/content/docs/12.8.0/index.html b/content/docs/12.8.0/index.html
index 275a3839f..a7987b45d 100644
--- a/content/docs/12.8.0/index.html
+++ b/content/docs/12.8.0/index.html
@@ -179,7 +179,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:27</p>
+<p>Last Updated: 02 October 25 at 00:24</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.8.0/searchindex.js
b/content/docs/12.8.0/searchindex.js
index 32558fa16..5e10257b4 100644
--- a/content/docs/12.8.0/searchindex.js
+++ b/content/docs/12.8.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/benchmarks/iozone/index",
"applications/bench [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/benchmarks/iozone/index",
"applications/bench [...]
\ No newline at end of file
diff --git a/content/docs/12.9.0/index.html b/content/docs/12.9.0/index.html
index f74b86b76..bdee426b2 100644
--- a/content/docs/12.9.0/index.html
+++ b/content/docs/12.9.0/index.html
@@ -179,7 +179,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:29</p>
+<p>Last Updated: 02 October 25 at 00:26</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/12.9.0/searchindex.js
b/content/docs/12.9.0/searchindex.js
index 26acf4749..ffc7d43f4 100644
--- a/content/docs/12.9.0/searchindex.js
+++ b/content/docs/12.9.0/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/cyclictest/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/b [...]
\ No newline at end of file
+Search.setIndex({"docnames": ["applications/audioutils/fmsynt/index",
"applications/audioutils/index", "applications/audioutils/mml_parser/index",
"applications/audioutils/nxaudio/index",
"applications/benchmarks/cachespeed/index",
"applications/benchmarks/coremark-pro/index",
"applications/benchmarks/coremark/index",
"applications/benchmarks/cyclictest/index",
"applications/benchmarks/dhrystone/index", "applications/benchmarks/fio/index",
"applications/benchmarks/index", "applications/b [...]
\ No newline at end of file
diff --git
a/content/docs/latest/_sources/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.rst.txt
b/content/docs/latest/_sources/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.rst.txt
index 15110fe53..0173dbe2e 100644
---
a/content/docs/latest/_sources/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.rst.txt
+++
b/content/docs/latest/_sources/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.rst.txt
@@ -621,6 +621,47 @@ the ``Device Drivers -> CAN Driver Support -> CAN loopback
mode`` option and run
SJW: 3
ID: 1 DLC: 1
+ulp
+---
+
+This configuration enables the support for the ULP RISC-V core coprocessor.
+To get more information about LP Core please check :ref:`ULP LP Core
Coprocessor docs. <esp32s2_ulp>`
+
+Configuration uses a pre-built binary in
``Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin``
+which is a blink example for GPIO0. After flashing operation, GPIO0 pin will
blink.
+
+Prebuild binary runs this code:
+
+.. code-block:: C
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <stdbool.h>
+ #include "ulp_riscv.h"
+ #include "ulp_riscv_utils.h"
+ #include "ulp_riscv_gpio.h"
+
+ #define GPIO_PIN 0
+
+ #define nop() __asm__ __volatile__ ("nop")
+
+ bool gpio_level_previous = true;
+
+ int main (void)
+ {
+ while (1)
+ {
+ ulp_riscv_gpio_output_level(GPIO_PIN, gpio_level_previous);
+ gpio_level_previous = !gpio_level_previous;
+ for (int i = 0; i < 10000; i++)
+ {
+ nop();
+ }
+ }
+
+ return 0;
+ }
+
watchdog
--------
diff --git
a/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
b/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
index f0394902f..2b6e11af7 100644
--- a/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/xtensa/esp32s2/index.rst.txt
@@ -821,6 +821,167 @@ to ``Application image secondary slot``.
and change usage mode to ``Release`` in `System Type --> Application Image
Configuration --> Enable usage mode`.
**After disabling UART Download Mode you will not be able to flash other
images through UART.**
+.. _esp32s2_ulp:
+
+ULP RISC-V Coprocessor
+======================
+
+The ULP RISC-V core is a 32-bit coprocessor integrated into the ESP32-S2 SoC.
+It is designed to run independently of the main high-performance (HP) core and
is capable of executing lightweight tasks
+such as GPIO polling, simple peripheral control and I/O interactions.
+
+This coprocessor benefits to offload simple tasks from HP core (e.g., GPIO
polling , I2C operations, basic control logic) and
+frees the main CPU for higher-level processing
+
+For more information about ULP RISC-V Coprocessor `check here
<https://docs.espressif.com/projects/esp-idf/en/stable/esp32s2/api-reference/system/ulp-risc-v.html>`__.
+
+Features of the ULP RISC-V Coprocessor
+--------------------------------------
+
+* Processor Architecture
+ - RV32IMC RISC-V core — Integer (I), Multiplication/Division (M), and
Compressed (C) instructions
+ - Runs at 17.5 MHz
+* Memory
+ - Access to 8 KB of RTC slow memory (RTC_SLOW_MEM) memory region, and
registers in RTC_CNTL, RTC_IO, and SARADC peripherals
+* Debugging
+ - Logging via bit-banged UART
+ - Shared memory for state inspection
+ - Panic or exception handlers can trigger wake-up or signal to main CPU if
main CPU is in sleep
+* Peripheral support
+ - RTC domain peripherals (RTC GPIO, RTC I2C, ADC)
+
+Loading Binary into ULP RISC-V Coprocessor
+------------------------------------------
+
+There are two ways to load a binary into LP-Core:
+ - Using a prebuilt binary
+ - Using NuttX internal build system to build your own (bare-metal)
application
+
+When using a prebuilt binary, the already compiled output for the ULP system
whether built from NuttX
+or the ESP-IDF environment can be leveraged. However, whenever the ULP code
needs to be modified, it must be rebuilt separately,
+and the resulting .bin file has to be integrated into NuttX. This workflow,
while compatible, can become tedious.
+
+With NuttX internal build system, the ULP binary code can be built and flashed
from a single location. It is more convenient but
+using build system has some dependencies on example side.
+
+Both methods requires `CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM` variable to set
ULP RISC-V core and
+`CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH` variable to set the path to the ULP
project or prebuilt binary file
+relative to NuttX root folder.
+These variables can be set using `make menuconfig` or `kconfig-tweak` commands.
+
+Here is an example for enabling ULP and using a prebuilt binary for ULP RISC-V
core::
+
+ make distclean
+ ./tools/configure.sh esp32s2-saola-1:nsh
+ kconfig-tweak --set-val CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM 8176
+ kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin"
+ make olddefconfig
+ make -j
+
+Creating an ULP RISC-V Coprocessor Application
+----------------------------------------------
+
+To use NuttX's internal build system to compile the bare-metal ULP RISC-V
Coprocessor binary, check the following instructions.
+
+First, create a folder for the ULP source and header files. This folder is
just for ULP project and it is
+an independent project. Therefore, the NuttX example guide should not be
followed, and no Makefile or similar
+build files should be added. Also folder location could be anywhere. To
include ULP folder into build
+system don't forget to set `CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH` variable
with path of the ULP project folder relative to
+NuttX root folder. Instructions for setting up can be found above.
+
+NuttX's internal functions or POSIX calls are not supported.
+
+Here is an example:
+
+- ULP UART Snippet:
+
+.. code-block:: C
+
+ #include "ulp_riscv.h"
+ #include "ulp_riscv_utils.h"
+ #include "ulp_riscv_print.h"
+ #include "ulp_riscv_uart_ulp_core.h"
+ #include "sdkconfig.h"
+
+ static ulp_riscv_uart_t s_print_uart;
+
+ int main (void)
+ {
+ ulp_riscv_uart_cfg_t cfg = {
+ .tx_pin = 0,
+ };
+ ulp_riscv_uart_init(&s_print_uart, &cfg);
+ ulp_riscv_print_install((putc_fn_t)ulp_riscv_uart_putc, &s_print_uart);
+
+ while(1)
+ {
+ ulp_riscv_print_str("Hello from the LP core!!\r\n");
+ ulp_riscv_delay_cycles(1000 * ULP_RISCV_CYCLES_PER_MS);
+ }
+
+ return 0;
+ }
+
+For more information about ULP RISC-V Coprocessor examples `check here
<https://github.com/espressif/esp-idf/tree/master/examples/system/ulp/lp_core>`__.
+After these settings follow the same steps as for any other configuration to
build NuttX. Build system checks ULP project path,
+adds every source and header file into project and builds it.
+
+To sum up, here is an complete example. `ulp_example/ulp (../ulp_example/ulp)`
folder selected as example
+to create a subfolder for ULP but folder that includes ULP source code can be
anywhere:
+
+- Tree view:
+
+.. code-block:: text
+
+ nuttxspace/
+ ├── nuttx/
+ └── apps/
+ └── ulp_example/
+ └── ulp/
+ └── ulp_main.c
+
+- Contents in ulp_main.c:
+
+.. code-block:: C
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <stdbool.h>
+ #include "ulp_riscv.h"
+ #include "ulp_riscv_utils.h"
+ #include "ulp_riscv_gpio.h"
+
+ #define GPIO_PIN 0
+
+ #define nop() __asm__ __volatile__ ("nop")
+
+ bool gpio_level_previous = true;
+
+ int main (void)
+ {
+ while (1)
+ {
+ ulp_riscv_gpio_output_level(GPIO_PIN, gpio_level_previous);
+ gpio_level_previous = !gpio_level_previous;
+ for (int i = 0; i < 10000; i++)
+ {
+ nop();
+ }
+ }
+
+ return 0;
+ }
+
+- Command to build::
+
+ make distclean
+ ./tools/configure.sh esp32s2-saola-1:nsh
+ kconfig-tweak --set-val CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM 8176
+ kconfig-tweak -e CONFIG_DEV_GPIO
+ kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"../ulp_example/ulp"
+ make olddefconfig
+ make -j
+
_`Managing esptool on virtual environment`
==========================================
diff --git
a/content/docs/latest/_sources/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.rst.txt
b/content/docs/latest/_sources/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.rst.txt
index fa7017011..4a6dd901b 100644
---
a/content/docs/latest/_sources/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.rst.txt
+++
b/content/docs/latest/_sources/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.rst.txt
@@ -1151,6 +1151,47 @@ the ``Device Drivers -> CAN Driver Support -> CAN
loopback mode`` option and run
SJW: 3
ID: 1 DLC: 1
+ulp
+---
+
+This configuration enables the support for the ULP RISC-V core coprocessor.
+To get more information about LP Core please check :ref:`ULP LP Core
Coprocessor docs. <esp32s3_ulp>`
+
+Configuration uses a pre-built binary in
``Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin``
+which is a blink example for GPIO0. After flashing operation, GPIO0 pin will
blink.
+
+Prebuild binary runs this code:
+
+.. code-block:: C
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <stdbool.h>
+ #include "ulp_riscv.h"
+ #include "ulp_riscv_utils.h"
+ #include "ulp_riscv_gpio.h"
+
+ #define GPIO_PIN 0
+
+ #define nop() __asm__ __volatile__ ("nop")
+
+ bool gpio_level_previous = true;
+
+ int main (void)
+ {
+ while (1)
+ {
+ ulp_riscv_gpio_output_level(GPIO_PIN, gpio_level_previous);
+ gpio_level_previous = !gpio_level_previous;
+ for (int i = 0; i < 10000; i++)
+ {
+ nop();
+ }
+ }
+
+ return 0;
+ }
+
usbnsh
------
diff --git
a/content/docs/latest/_sources/platforms/xtensa/esp32s3/index.rst.txt
b/content/docs/latest/_sources/platforms/xtensa/esp32s3/index.rst.txt
index 76b6be36e..8309bdd97 100644
--- a/content/docs/latest/_sources/platforms/xtensa/esp32s3/index.rst.txt
+++ b/content/docs/latest/_sources/platforms/xtensa/esp32s3/index.rst.txt
@@ -646,6 +646,170 @@ Set the attribute ``__attribute__ ((section
(".ext_ram.bss")))`` to the variable
This is particularly useful when the internal RAM is not enough to hold all
the data.
+.. _esp32s3_ulp:
+
+ULP RISC-V Coprocessor
+======================
+
+The ULP RISC-V core is a 32-bit coprocessor integrated into the ESP32-S3 SoC.
+It is designed to run independently of the main high-performance (HP) core and
is capable of executing lightweight tasks
+such as GPIO polling, simple peripheral control and I/O interactions.
+
+This coprocessor benefits to offload simple tasks from HP core (e.g., GPIO
polling , I2C operations, basic control logic) and
+frees the main CPU for higher-level processing
+
+For more information about ULP RISC-V Coprocessor `check here
<https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/api-reference/system/ulp-risc-v.html>`__.
+
+Features of the ULP RISC-V Coprocessor
+--------------------------------------
+
+* Processor Architecture
+ - RV32IMC RISC-V core — Integer (I), Multiplication/Division (M), and
Compressed (C) instructions
+ - Runs at 17.5 MHz
+* Memory
+ - Access to 8 KB of RTC slow memory (RTC_SLOW_MEM) memory region, and
registers in RTC_CNTL, RTC_IO, and SARADC peripherals
+* Debugging
+ - Logging via bit-banged UART
+ - Shared memory for state inspection
+ - Panic or exception handlers can trigger wake-up or signal to main CPU if
main CPU is in sleep
+* Peripheral support
+ - RTC domain peripherals (RTC GPIO, RTC I2C, ADC)
+
+Loading Binary into ULP RISC-V Coprocessor
+------------------------------------------
+
+There are two ways to load a binary into LP-Core:
+ - Using a prebuilt binary
+ - Using NuttX internal build system to build your own (bare-metal)
application
+
+When using a prebuilt binary, the already compiled output for the ULP system
whether built from NuttX
+or the ESP-IDF environment can be leveraged. However, whenever the ULP code
needs to be modified, it must be rebuilt separately,
+and the resulting .bin file has to be integrated into NuttX. This workflow,
while compatible, can become tedious.
+
+With NuttX internal build system, the ULP binary code can be built and flashed
from a single location. It is more convenient but
+using build system has some dependencies on example side.
+
+Both methods requires `CONFIG_ESP32S3_ULP_COPROC_ENABLED` and
`CONFIG_ESP32S3_ULP_COPROC_RESERVE_MEM` variables to set ULP RISC-V core and
+`CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH` variable to set the path to the ULP
project or prebuilt binary file
+relative to NuttX root folder.
+These variables can be set using `make menuconfig` or `kconfig-tweak` commands.
+
+Here is an example for enabling ULP and using a prebuilt binary for ULP RISC-V
core::
+
+ make distclean
+ ./tools/configure.sh esp32s3-devkit:nsh
+ kconfig-tweak -e CONFIG_ESP32S3_ULP_COPROC_ENABLED
+ kconfig-tweak --set-val CONFIG_ESP32S3_ULP_COPROC_RESERVE_MEM 8176
+ kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin"
+ make olddefconfig
+ make -j
+
+Creating an ULP RISC-V Coprocessor Application
+----------------------------------------------
+
+To use NuttX's internal build system to compile the bare-metal ULP RISC-V
Coprocessor binary, check the following instructions.
+
+First, create a folder for the ULP source and header files. This folder is
just for ULP project and it is
+an independent project. Therefore, the NuttX example guide should not be
followed, and no Makefile or similar
+build files should be added. Also folder location could be anywhere. To
include ULP folder into build
+system don't forget to set `CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH` variable
with path of the ULP project folder relative to
+NuttX root folder. Instructions for setting up can be found above.
+
+NuttX's internal functions or POSIX calls are not supported.
+
+Here is an example:
+
+- ULP UART Snippet:
+
+.. code-block:: C
+
+ #include "ulp_riscv.h"
+ #include "ulp_riscv_utils.h"
+ #include "ulp_riscv_print.h"
+ #include "ulp_riscv_uart_ulp_core.h"
+ #include "sdkconfig.h"
+
+ static ulp_riscv_uart_t s_print_uart;
+
+ int main (void)
+ {
+ ulp_riscv_uart_cfg_t cfg = {
+ .tx_pin = 0,
+ };
+ ulp_riscv_uart_init(&s_print_uart, &cfg);
+ ulp_riscv_print_install((putc_fn_t)ulp_riscv_uart_putc, &s_print_uart);
+
+ while(1)
+ {
+ ulp_riscv_print_str("Hello from the LP core!!\r\n");
+ ulp_riscv_delay_cycles(1000 * ULP_RISCV_CYCLES_PER_MS);
+ }
+
+ return 0;
+ }
+
+For more information about ULP RISC-V Coprocessor examples `check here
<https://github.com/espressif/esp-idf/tree/master/examples/system/ulp/lp_core>`__.
+After these settings follow the same steps as for any other configuration to
build NuttX. Build system checks ULP project path,
+adds every source and header file into project and builds it.
+
+To sum up, here is an complete example. `ulp_example/ulp (../ulp_example/ulp)`
folder selected as example
+to create a subfolder for ULP but folder that includes ULP source code can be
anywhere:
+
+- Tree view:
+
+.. code-block:: text
+
+ nuttxspace/
+ ├── nuttx/
+ └── apps/
+ └── ulp_example/
+ └── ulp/
+ └── ulp_main.c
+
+- Contents in ulp_main.c:
+
+.. code-block:: C
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <stdbool.h>
+ #include "ulp_riscv.h"
+ #include "ulp_riscv_utils.h"
+ #include "ulp_riscv_gpio.h"
+
+ #define GPIO_PIN 0
+
+ #define nop() __asm__ __volatile__ ("nop")
+
+ bool gpio_level_previous = true;
+
+ int main (void)
+ {
+ while (1)
+ {
+ ulp_riscv_gpio_output_level(GPIO_PIN, gpio_level_previous);
+ gpio_level_previous = !gpio_level_previous;
+ for (int i = 0; i < 10000; i++)
+ {
+ nop();
+ }
+ }
+
+ return 0;
+ }
+
+- Command to build::
+
+ make distclean
+ ./tools/configure.sh esp32s3-devkitc:nsh
+ kconfig-tweak -e CONFIG_ESP32S3_ULP_COPROC_ENABLED
+ kconfig-tweak --set-val CONFIG_ESP32S3_ULP_COPROC_RESERVE_MEM 8176
+ kconfig-tweak -e CONFIG_DEV_GPIO
+ kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"../ulp_example/ulp"
+ make olddefconfig
+ make -j
+
+
_`Managing esptool on virtual environment`
==========================================
diff --git a/content/docs/latest/guides/fully_linked_elf.html
b/content/docs/latest/guides/fully_linked_elf.html
index c4169adb5..58fcad127 100644
--- a/content/docs/latest/guides/fully_linked_elf.html
+++ b/content/docs/latest/guides/fully_linked_elf.html
@@ -475,7 +475,7 @@ NuttX package: <code class="docutils literal
notranslate"><span class="pre">nutt
<div
class="admonition-here-is-an-alternative-minimal-and-possibly-outdated-version
admonition">
<p class="admonition-title">Here is an alternative minimal (and possibly
outdated) version</p>
<div class="sphinx_collapse docutils">
-<input class="sphinx_collapse__input"
id="e024079d-fdc9-429f-b228-ab4c8a6b8bb9"
name="e024079d-fdc9-429f-b228-ab4c8a6b8bb9" type="checkbox"><label
class="sphinx_collapse__label" for="e024079d-fdc9-429f-b228-ab4c8a6b8bb9"><i
class="sphinx_collapse__icon"></i>Show content:</label><div
class="sphinx_collapse__content docutils">
+<input class="sphinx_collapse__input"
id="96ed738b-0db8-42fa-b619-ffce593032cb"
name="96ed738b-0db8-42fa-b619-ffce593032cb" type="checkbox"><label
class="sphinx_collapse__label" for="96ed738b-0db8-42fa-b619-ffce593032cb"><i
class="sphinx_collapse__icon"></i>Show content:</label><div
class="sphinx_collapse__content docutils">
<div class="highlight-text notranslate"><div
class="highlight"><pre><span></span>SECTIONS
{
.text 0x00000000 :
diff --git a/content/docs/latest/guides/partially_linked_elf.html
b/content/docs/latest/guides/partially_linked_elf.html
index b15f7ea31..5226df1d6 100644
--- a/content/docs/latest/guides/partially_linked_elf.html
+++ b/content/docs/latest/guides/partially_linked_elf.html
@@ -501,7 +501,7 @@ NuttX package: <code class="docutils literal
notranslate"><span class="pre">nutt
<div
class="admonition-here-is-an-alternative-minimal-and-possibly-outdated-version
admonition">
<p class="admonition-title">Here is an alternative minimal (and possibly
outdated) version</p>
<div class="sphinx_collapse docutils">
-<input class="sphinx_collapse__input"
id="8904b9ca-a4ad-49fc-aa2a-ad0e993cb3f8"
name="8904b9ca-a4ad-49fc-aa2a-ad0e993cb3f8" type="checkbox"><label
class="sphinx_collapse__label" for="8904b9ca-a4ad-49fc-aa2a-ad0e993cb3f8"><i
class="sphinx_collapse__icon"></i>Show content:</label><div
class="sphinx_collapse__content docutils">
+<input class="sphinx_collapse__input"
id="425abb5d-46b1-4b96-b6a8-3c06d7c95f79"
name="425abb5d-46b1-4b96-b6a8-3c06d7c95f79" type="checkbox"><label
class="sphinx_collapse__label" for="425abb5d-46b1-4b96-b6a8-3c06d7c95f79"><i
class="sphinx_collapse__icon"></i>Show content:</label><div
class="sphinx_collapse__content docutils">
<div class="highlight-text notranslate"><div
class="highlight"><pre><span></span>SECTIONS
{
.text 0x00000000 :
diff --git a/content/docs/latest/index.html b/content/docs/latest/index.html
index a4e0f9a42..113b8f33b 100644
--- a/content/docs/latest/index.html
+++ b/content/docs/latest/index.html
@@ -185,7 +185,7 @@ standards. Additional standard APIs from Unix and other
common RTOS’s (such as
VxWorks) are adopted for functionality not available under these standards, or
for functionality that is not appropriate for deeply-embedded environments
(such
as fork()).</p>
-<p>Last Updated: 01 October 25 at 00:32</p>
+<p>Last Updated: 02 October 25 at 00:30</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of
Contents</span></p>
<ul class="current">
diff --git a/content/docs/latest/objects.inv b/content/docs/latest/objects.inv
index 62976efcb..1ee7c66a9 100644
Binary files a/content/docs/latest/objects.inv and
b/content/docs/latest/objects.inv differ
diff --git
a/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-kaluga-1/index.html
b/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-kaluga-1/index.html
index ff283bca9..bb07ba82b 100644
---
a/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-kaluga-1/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-kaluga-1/index.html
@@ -161,6 +161,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi-softap">Wi-Fi SoftAP</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5 current"><a class="current reference internal"
href="#">ESP32-S2-Kaluga-1 Kit v1.3</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.html
b/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.html
index 06c701366..979d31f5a 100644
---
a/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s2/boards/esp32s2-saola-1/index.html
@@ -161,6 +161,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi-softap">Wi-Fi SoftAP</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s2-kaluga-1/index.html">ESP32-S2-Kaluga-1 Kit v1.3</a></li>
@@ -866,6 +867,43 @@ Bit timing:
</pre></div>
</div>
</section>
+<section id="ulp">
+<h3>ulp<a class="headerlink" href="#ulp" title="Permalink to this
heading"></a></h3>
+<p>This configuration enables the support for the ULP RISC-V core coprocessor.
+To get more information about LP Core please check <a class="reference
internal" href="../../index.html#esp32s2-ulp"><span class="std std-ref">ULP LP
Core Coprocessor docs.</span></a></p>
+<p>Configuration uses a pre-built binary in <code class="docutils literal
notranslate"><span
class="pre">Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin</span></code>
+which is a blink example for GPIO0. After flashing operation, GPIO0 pin will
blink.</p>
+<p>Prebuild binary runs this code:</p>
+<div class="highlight-C notranslate"><div
class="highlight"><pre><span></span><span class="cp">#include</span><span
class="w"> </span><span class="cpf"><stdio.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdint.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdbool.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_utils.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_gpio.h"</span>
+
+<span class="cp">#define GPIO_PIN 0</span>
+
+<span class="cp">#define nop() __asm__ __volatile__ ("nop")</span>
+
+<span class="kt">bool</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="nb">true</span><span
class="p">;</span>
+
+<span class="kt">int</span><span class="w"> </span><span
class="nf">main</span><span class="w"> </span><span class="p">(</span><span
class="kt">void</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="k">while</span><span class="w">
</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span
class="n">ulp_riscv_gpio_output_level</span><span class="p">(</span><span
class="n">GPIO_PIN</span><span class="p">,</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="p">);</span>
+<span class="w"> </span><span class="n">gpio_level_previous</span><span
class="w"> </span><span class="o">=</span><span class="w"> </span><span
class="o">!</span><span class="n">gpio_level_previous</span><span
class="p">;</span>
+<span class="w"> </span><span class="k">for</span><span class="w">
</span><span class="p">(</span><span class="kt">int</span><span class="w">
</span><span class="n">i</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="mi">0</span><span
class="p">;</span><span class="w"> </span><span class="n">i</span><span
class="w"> </span><span class="o"><</span><span class="w"> </span><span
class="mi">10000</span><span class="p">;</span><span class="w" [...]
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="n">nop</span><span
class="p">();</span>
+<span class="w"> </span><span class="p">}</span>
+<span class="w"> </span><span class="p">}</span>
+
+<span class="w"> </span><span class="k">return</span><span class="w">
</span><span class="mi">0</span><span class="p">;</span>
+<span class="w"> </span><span class="p">}</span>
+</pre></div>
+</div>
+</section>
<section id="watchdog">
<h3>watchdog<a class="headerlink" href="#watchdog" title="Permalink to this
heading"></a></h3>
<p>This config test the watchdog timers. It includes the 2 MWDTs,
diff --git a/content/docs/latest/platforms/xtensa/esp32s2/index.html
b/content/docs/latest/platforms/xtensa/esp32s2/index.html
index f993c4670..0b7ad0f3a 100644
--- a/content/docs/latest/platforms/xtensa/esp32s2/index.html
+++ b/content/docs/latest/platforms/xtensa/esp32s2/index.html
@@ -187,6 +187,12 @@
<li class="toctree-l5"><a class="reference internal"
href="#secure-boot-and-flash-encryption">Secure Boot and Flash
Encryption</a></li>
</ul>
</li>
+<li class="toctree-l4"><a class="reference internal"
href="#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a><ul>
+<li class="toctree-l5"><a class="reference internal"
href="#features-of-the-ulp-risc-v-coprocessor">Features of the ULP RISC-V
Coprocessor</a></li>
+<li class="toctree-l5"><a class="reference internal"
href="#loading-binary-into-ulp-risc-v-coprocessor">Loading Binary into ULP
RISC-V Coprocessor</a></li>
+<li class="toctree-l5"><a class="reference internal"
href="#creating-an-ulp-risc-v-coprocessor-application">Creating an ULP RISC-V
Coprocessor Application</a></li>
+</ul>
+</li>
<li class="toctree-l4"><a class="reference internal" href="#id1">Managing
esptool on virtual environment</a><ul>
<li class="toctree-l5"><a class="reference internal"
href="#using-pipx-recommended">Using pipx (recommended)</a></li>
<li class="toctree-l5"><a class="reference internal"
href="#using-venv-alternative">Using venv (alternative)</a></li>
@@ -1444,6 +1450,180 @@ and change usage mode to <code class="docutils literal
notranslate"><span class=
</section>
</section>
</section>
+<section id="ulp-risc-v-coprocessor">
+<span id="esp32s2-ulp"></span><h2>ULP RISC-V Coprocessor<a class="headerlink"
href="#ulp-risc-v-coprocessor" title="Permalink to this heading"></a></h2>
+<p>The ULP RISC-V core is a 32-bit coprocessor integrated into the ESP32-S2
SoC.
+It is designed to run independently of the main high-performance (HP) core and
is capable of executing lightweight tasks
+such as GPIO polling, simple peripheral control and I/O interactions.</p>
+<p>This coprocessor benefits to offload simple tasks from HP core (e.g., GPIO
polling , I2C operations, basic control logic) and
+frees the main CPU for higher-level processing</p>
+<p>For more information about ULP RISC-V Coprocessor <a class="reference
external"
href="https://docs.espressif.com/projects/esp-idf/en/stable/esp32s2/api-reference/system/ulp-risc-v.html";>check
here</a>.</p>
+<section id="features-of-the-ulp-risc-v-coprocessor">
+<h3>Features of the ULP RISC-V Coprocessor<a class="headerlink"
href="#features-of-the-ulp-risc-v-coprocessor" title="Permalink to this
heading"></a></h3>
+<ul class="simple">
+<li><dl class="simple">
+<dt>Processor Architecture</dt><dd><ul>
+<li><p>RV32IMC RISC-V core — Integer (I), Multiplication/Division (M), and
Compressed (C) instructions</p></li>
+<li><p>Runs at 17.5 MHz</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Memory</dt><dd><ul>
+<li><p>Access to 8 KB of RTC slow memory (RTC_SLOW_MEM) memory region, and
registers in RTC_CNTL, RTC_IO, and SARADC peripherals</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Debugging</dt><dd><ul>
+<li><p>Logging via bit-banged UART</p></li>
+<li><p>Shared memory for state inspection</p></li>
+<li><p>Panic or exception handlers can trigger wake-up or signal to main CPU
if main CPU is in sleep</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Peripheral support</dt><dd><ul>
+<li><p>RTC domain peripherals (RTC GPIO, RTC I2C, ADC)</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+</ul>
+</section>
+<section id="loading-binary-into-ulp-risc-v-coprocessor">
+<h3>Loading Binary into ULP RISC-V Coprocessor<a class="headerlink"
href="#loading-binary-into-ulp-risc-v-coprocessor" title="Permalink to this
heading"></a></h3>
+<dl class="simple">
+<dt>There are two ways to load a binary into LP-Core:</dt><dd><ul
class="simple">
+<li><p>Using a prebuilt binary</p></li>
+<li><p>Using NuttX internal build system to build your own (bare-metal)
application</p></li>
+</ul>
+</dd>
+</dl>
+<p>When using a prebuilt binary, the already compiled output for the ULP
system whether built from NuttX
+or the ESP-IDF environment can be leveraged. However, whenever the ULP code
needs to be modified, it must be rebuilt separately,
+and the resulting .bin file has to be integrated into NuttX. This workflow,
while compatible, can become tedious.</p>
+<p>With NuttX internal build system, the ULP binary code can be built and
flashed from a single location. It is more convenient but
+using build system has some dependencies on example side.</p>
+<p>Both methods requires <cite>CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM</cite>
variable to set ULP RISC-V core and
+<cite>CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH</cite> variable to set the path
to the ULP project or prebuilt binary file
+relative to NuttX root folder.
+These variables can be set using <cite>make menuconfig</cite> or
<cite>kconfig-tweak</cite> commands.</p>
+<p>Here is an example for enabling ULP and using a prebuilt binary for ULP
RISC-V core:</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>make distclean
+./tools/configure.sh esp32s2-saola-1:nsh
+kconfig-tweak --set-val CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM 8176
+kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin"
+make olddefconfig
+make -j
+</pre></div>
+</div>
+</section>
+<section id="creating-an-ulp-risc-v-coprocessor-application">
+<h3>Creating an ULP RISC-V Coprocessor Application<a class="headerlink"
href="#creating-an-ulp-risc-v-coprocessor-application" title="Permalink to this
heading"></a></h3>
+<p>To use NuttX’s internal build system to compile the bare-metal ULP RISC-V
Coprocessor binary, check the following instructions.</p>
+<p>First, create a folder for the ULP source and header files. This folder is
just for ULP project and it is
+an independent project. Therefore, the NuttX example guide should not be
followed, and no Makefile or similar
+build files should be added. Also folder location could be anywhere. To
include ULP folder into build
+system don’t forget to set
<cite>CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH</cite> variable with path of the
ULP project folder relative to
+NuttX root folder. Instructions for setting up can be found above.</p>
+<p>NuttX’s internal functions or POSIX calls are not supported.</p>
+<p>Here is an example:</p>
+<ul class="simple">
+<li><p>ULP UART Snippet:</p></li>
+</ul>
+<div class="highlight-C notranslate"><div
class="highlight"><pre><span></span><span class="cp">#include</span><span
class="w"> </span><span class="cpf">"ulp_riscv.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_utils.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_print.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_uart_ulp_core.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"sdkconfig.h"</span>
+
+<span class="k">static</span><span class="w"> </span><span
class="n">ulp_riscv_uart_t</span><span class="w"> </span><span
class="n">s_print_uart</span><span class="p">;</span>
+
+<span class="kt">int</span><span class="w"> </span><span
class="nf">main</span><span class="w"> </span><span class="p">(</span><span
class="kt">void</span><span class="p">)</span>
+<span class="p">{</span>
+<span class="w"> </span><span class="n">ulp_riscv_uart_cfg_t</span><span
class="w"> </span><span class="n">cfg</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="p">.</span><span
class="n">tx_pin</span><span class="w"> </span><span class="o">=</span><span
class="w"> </span><span class="mi">0</span><span class="p">,</span>
+<span class="w"> </span><span class="p">};</span>
+<span class="w"> </span><span class="n">ulp_riscv_uart_init</span><span
class="p">(</span><span class="o">&</span><span
class="n">s_print_uart</span><span class="p">,</span><span class="w">
</span><span class="o">&</span><span class="n">cfg</span><span
class="p">);</span>
+<span class="w"> </span><span class="n">ulp_riscv_print_install</span><span
class="p">((</span><span class="n">putc_fn_t</span><span
class="p">)</span><span class="n">ulp_riscv_uart_putc</span><span
class="p">,</span><span class="w"> </span><span class="o">&</span><span
class="n">s_print_uart</span><span class="p">);</span>
+
+<span class="w"> </span><span class="k">while</span><span
class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="n">ulp_riscv_print_str</span><span
class="p">(</span><span class="s">"Hello from the LP core!!</span><span
class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
+<span class="w"> </span><span class="n">ulp_riscv_delay_cycles</span><span
class="p">(</span><span class="mi">1000</span><span class="w"> </span><span
class="o">*</span><span class="w"> </span><span
class="n">ULP_RISCV_CYCLES_PER_MS</span><span class="p">);</span>
+<span class="w"> </span><span class="p">}</span>
+
+<span class="w"> </span><span class="k">return</span><span class="w">
</span><span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>For more information about ULP RISC-V Coprocessor examples <a
class="reference external"
href="https://github.com/espressif/esp-idf/tree/master/examples/system/ulp/lp_core";>check
here</a>.
+After these settings follow the same steps as for any other configuration to
build NuttX. Build system checks ULP project path,
+adds every source and header file into project and builds it.</p>
+<p>To sum up, here is an complete example. <cite>ulp_example/ulp
(../ulp_example/ulp)</cite> folder selected as example
+to create a subfolder for ULP but folder that includes ULP source code can be
anywhere:</p>
+<ul class="simple">
+<li><p>Tree view:</p></li>
+</ul>
+<div class="highlight-text notranslate"><div
class="highlight"><pre><span></span>nuttxspace/
+├── nuttx/
+└── apps/
+└── ulp_example/
+ └── ulp/
+ └── ulp_main.c
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>Contents in ulp_main.c:</p></li>
+</ul>
+<div class="highlight-C notranslate"><div
class="highlight"><pre><span></span><span class="cp">#include</span><span
class="w"> </span><span class="cpf"><stdio.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdint.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdbool.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_utils.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_gpio.h"</span>
+
+<span class="cp">#define GPIO_PIN 0</span>
+
+<span class="cp">#define nop() __asm__ __volatile__ ("nop")</span>
+
+<span class="kt">bool</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="nb">true</span><span
class="p">;</span>
+
+<span class="kt">int</span><span class="w"> </span><span
class="nf">main</span><span class="w"> </span><span class="p">(</span><span
class="kt">void</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="k">while</span><span class="w">
</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span
class="n">ulp_riscv_gpio_output_level</span><span class="p">(</span><span
class="n">GPIO_PIN</span><span class="p">,</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="p">);</span>
+<span class="w"> </span><span class="n">gpio_level_previous</span><span
class="w"> </span><span class="o">=</span><span class="w"> </span><span
class="o">!</span><span class="n">gpio_level_previous</span><span
class="p">;</span>
+<span class="w"> </span><span class="k">for</span><span class="w">
</span><span class="p">(</span><span class="kt">int</span><span class="w">
</span><span class="n">i</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="mi">0</span><span
class="p">;</span><span class="w"> </span><span class="n">i</span><span
class="w"> </span><span class="o"><</span><span class="w"> </span><span
class="mi">10000</span><span class="p">;</span><span class="w" [...]
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="n">nop</span><span
class="p">();</span>
+<span class="w"> </span><span class="p">}</span>
+<span class="w"> </span><span class="p">}</span>
+
+<span class="w"> </span><span class="k">return</span><span class="w">
</span><span class="mi">0</span><span class="p">;</span>
+<span class="w"> </span><span class="p">}</span>
+</pre></div>
+</div>
+<ul>
+<li><p>Command to build:</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>make distclean
+./tools/configure.sh esp32s2-saola-1:nsh
+kconfig-tweak --set-val CONFIG_ESP32S2_ULP_COPROC_RESERVE_MEM 8176
+kconfig-tweak -e CONFIG_DEV_GPIO
+kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"../ulp_example/ulp"
+make olddefconfig
+make -j
+</pre></div>
+</div>
+</li>
+</ul>
+</section>
+</section>
<section id="id1">
<h2><span class="target" id="managing-esptool-on-virtual-environment">Managing
esptool on virtual environment</span><a class="headerlink" href="#id1"
title="Permalink to this heading"></a></h2>
<p>This section describes how to install <code class="docutils literal
notranslate"><span class="pre">esptool</span></code>, <code class="docutils
literal notranslate"><span class="pre">imgtool</span></code> or any other
Python packages in a
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-8048S043/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-8048S043/index.html
index f510d75a0..586757eb9 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-8048S043/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-8048S043/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5 current"><a class="current reference internal"
href="#">ESP32S3-8048S043</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.html
index baa35f5ab..1de4b627a 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-devkit/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
@@ -1393,6 +1394,43 @@ Bit timing:
</pre></div>
</div>
</section>
+<section id="ulp">
+<h3>ulp<a class="headerlink" href="#ulp" title="Permalink to this
heading"></a></h3>
+<p>This configuration enables the support for the ULP RISC-V core coprocessor.
+To get more information about LP Core please check <a class="reference
internal" href="../../index.html#esp32s3-ulp"><span class="std std-ref">ULP LP
Core Coprocessor docs.</span></a></p>
+<p>Configuration uses a pre-built binary in <code class="docutils literal
notranslate"><span
class="pre">Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin</span></code>
+which is a blink example for GPIO0. After flashing operation, GPIO0 pin will
blink.</p>
+<p>Prebuild binary runs this code:</p>
+<div class="highlight-C notranslate"><div
class="highlight"><pre><span></span><span class="cp">#include</span><span
class="w"> </span><span class="cpf"><stdio.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdint.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdbool.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_utils.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_gpio.h"</span>
+
+<span class="cp">#define GPIO_PIN 0</span>
+
+<span class="cp">#define nop() __asm__ __volatile__ ("nop")</span>
+
+<span class="kt">bool</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="nb">true</span><span
class="p">;</span>
+
+<span class="kt">int</span><span class="w"> </span><span
class="nf">main</span><span class="w"> </span><span class="p">(</span><span
class="kt">void</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="k">while</span><span class="w">
</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span
class="n">ulp_riscv_gpio_output_level</span><span class="p">(</span><span
class="n">GPIO_PIN</span><span class="p">,</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="p">);</span>
+<span class="w"> </span><span class="n">gpio_level_previous</span><span
class="w"> </span><span class="o">=</span><span class="w"> </span><span
class="o">!</span><span class="n">gpio_level_previous</span><span
class="p">;</span>
+<span class="w"> </span><span class="k">for</span><span class="w">
</span><span class="p">(</span><span class="kt">int</span><span class="w">
</span><span class="n">i</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="mi">0</span><span
class="p">;</span><span class="w"> </span><span class="n">i</span><span
class="w"> </span><span class="o"><</span><span class="w"> </span><span
class="mi">10000</span><span class="p">;</span><span class="w" [...]
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="n">nop</span><span
class="p">();</span>
+<span class="w"> </span><span class="p">}</span>
+<span class="w"> </span><span class="p">}</span>
+
+<span class="w"> </span><span class="k">return</span><span class="w">
</span><span class="mi">0</span><span class="p">;</span>
+<span class="w"> </span><span class="p">}</span>
+</pre></div>
+</div>
+</section>
<section id="usbnsh">
<h3>usbnsh<a class="headerlink" href="#usbnsh" title="Permalink to this
heading"></a></h3>
<p>Basic NuttShell configuration console enabled over USB Device (USB
CDC/ACM).</p>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-eye/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-eye/index.html
index 2f32b36dd..b5251ac64 100644
--- a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-eye/index.html
+++ b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-eye/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-korvo-2/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-korvo-2/index.html
index 011c3e63e..20b4163f8 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-korvo-2/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-korvo-2/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lcd-ev/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lcd-ev/index.html
index e16b07160..8b7431478 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lcd-ev/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lcd-ev/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lhcbit/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lhcbit/index.html
index 9351b21d7..6b639a0fb 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lhcbit/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-lhcbit/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-xiao/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-xiao/index.html
index 95a8596bf..440677fc6 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-xiao/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/esp32s3-xiao/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
diff --git
a/content/docs/latest/platforms/xtensa/esp32s3/boards/lckfb-szpi-esp32s3/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/boards/lckfb-szpi-esp32s3/index.html
index bb3a50b05..85cd0949a 100644
---
a/content/docs/latest/platforms/xtensa/esp32s3/boards/lckfb-szpi-esp32s3/index.html
+++
b/content/docs/latest/platforms/xtensa/esp32s3/boards/lckfb-szpi-esp32s3/index.html
@@ -158,6 +158,7 @@
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#mcuboot-and-ota-update">MCUBoot and OTA Update</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#wi-fi">Wi-Fi</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#power-management">Power Management</a></li>
+<li class="toctree-l4"><a class="reference internal"
href="../../index.html#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a></li>
<li class="toctree-l4"><a class="reference internal"
href="../../index.html#id1">Managing esptool on virtual environment</a></li>
<li class="toctree-l4 current"><a class="reference internal"
href="../../index.html#supported-boards">Supported Boards</a><ul
class="current">
<li class="toctree-l5"><a class="reference internal"
href="../esp32s3-8048S043/index.html">ESP32S3-8048S043</a></li>
diff --git a/content/docs/latest/platforms/xtensa/esp32s3/index.html
b/content/docs/latest/platforms/xtensa/esp32s3/index.html
index fb11dd784..626ed5c77 100644
--- a/content/docs/latest/platforms/xtensa/esp32s3/index.html
+++ b/content/docs/latest/platforms/xtensa/esp32s3/index.html
@@ -187,6 +187,12 @@
<li class="toctree-l5"><a class="reference internal"
href="#psram">PSRAM</a></li>
</ul>
</li>
+<li class="toctree-l4"><a class="reference internal"
href="#ulp-risc-v-coprocessor">ULP RISC-V Coprocessor</a><ul>
+<li class="toctree-l5"><a class="reference internal"
href="#features-of-the-ulp-risc-v-coprocessor">Features of the ULP RISC-V
Coprocessor</a></li>
+<li class="toctree-l5"><a class="reference internal"
href="#loading-binary-into-ulp-risc-v-coprocessor">Loading Binary into ULP
RISC-V Coprocessor</a></li>
+<li class="toctree-l5"><a class="reference internal"
href="#creating-an-ulp-risc-v-coprocessor-application">Creating an ULP RISC-V
Coprocessor Application</a></li>
+</ul>
+</li>
<li class="toctree-l4"><a class="reference internal" href="#id1">Managing
esptool on virtual environment</a><ul>
<li class="toctree-l5"><a class="reference internal"
href="#using-pipx-recommended">Using pipx (recommended)</a></li>
<li class="toctree-l5"><a class="reference internal"
href="#using-venv-alternative">Using venv (alternative)</a></li>
@@ -1011,6 +1017,182 @@ Set the attribute <code class="docutils literal
notranslate"><span class="pre">_
</section>
</section>
</section>
+<section id="ulp-risc-v-coprocessor">
+<span id="esp32s3-ulp"></span><h2>ULP RISC-V Coprocessor<a class="headerlink"
href="#ulp-risc-v-coprocessor" title="Permalink to this heading"></a></h2>
+<p>The ULP RISC-V core is a 32-bit coprocessor integrated into the ESP32-S3
SoC.
+It is designed to run independently of the main high-performance (HP) core and
is capable of executing lightweight tasks
+such as GPIO polling, simple peripheral control and I/O interactions.</p>
+<p>This coprocessor benefits to offload simple tasks from HP core (e.g., GPIO
polling , I2C operations, basic control logic) and
+frees the main CPU for higher-level processing</p>
+<p>For more information about ULP RISC-V Coprocessor <a class="reference
external"
href="https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/api-reference/system/ulp-risc-v.html";>check
here</a>.</p>
+<section id="features-of-the-ulp-risc-v-coprocessor">
+<h3>Features of the ULP RISC-V Coprocessor<a class="headerlink"
href="#features-of-the-ulp-risc-v-coprocessor" title="Permalink to this
heading"></a></h3>
+<ul class="simple">
+<li><dl class="simple">
+<dt>Processor Architecture</dt><dd><ul>
+<li><p>RV32IMC RISC-V core — Integer (I), Multiplication/Division (M), and
Compressed (C) instructions</p></li>
+<li><p>Runs at 17.5 MHz</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Memory</dt><dd><ul>
+<li><p>Access to 8 KB of RTC slow memory (RTC_SLOW_MEM) memory region, and
registers in RTC_CNTL, RTC_IO, and SARADC peripherals</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Debugging</dt><dd><ul>
+<li><p>Logging via bit-banged UART</p></li>
+<li><p>Shared memory for state inspection</p></li>
+<li><p>Panic or exception handlers can trigger wake-up or signal to main CPU
if main CPU is in sleep</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Peripheral support</dt><dd><ul>
+<li><p>RTC domain peripherals (RTC GPIO, RTC I2C, ADC)</p></li>
+</ul>
+</dd>
+</dl>
+</li>
+</ul>
+</section>
+<section id="loading-binary-into-ulp-risc-v-coprocessor">
+<h3>Loading Binary into ULP RISC-V Coprocessor<a class="headerlink"
href="#loading-binary-into-ulp-risc-v-coprocessor" title="Permalink to this
heading"></a></h3>
+<dl class="simple">
+<dt>There are two ways to load a binary into LP-Core:</dt><dd><ul
class="simple">
+<li><p>Using a prebuilt binary</p></li>
+<li><p>Using NuttX internal build system to build your own (bare-metal)
application</p></li>
+</ul>
+</dd>
+</dl>
+<p>When using a prebuilt binary, the already compiled output for the ULP
system whether built from NuttX
+or the ESP-IDF environment can be leveraged. However, whenever the ULP code
needs to be modified, it must be rebuilt separately,
+and the resulting .bin file has to be integrated into NuttX. This workflow,
while compatible, can become tedious.</p>
+<p>With NuttX internal build system, the ULP binary code can be built and
flashed from a single location. It is more convenient but
+using build system has some dependencies on example side.</p>
+<p>Both methods requires <cite>CONFIG_ESP32S3_ULP_COPROC_ENABLED</cite> and
<cite>CONFIG_ESP32S3_ULP_COPROC_RESERVE_MEM</cite> variables to set ULP RISC-V
core and
+<cite>CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH</cite> variable to set the path
to the ULP project or prebuilt binary file
+relative to NuttX root folder.
+These variables can be set using <cite>make menuconfig</cite> or
<cite>kconfig-tweak</cite> commands.</p>
+<p>Here is an example for enabling ULP and using a prebuilt binary for ULP
RISC-V core:</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>make distclean
+./tools/configure.sh esp32s3-devkit:nsh
+kconfig-tweak -e CONFIG_ESP32S3_ULP_COPROC_ENABLED
+kconfig-tweak --set-val CONFIG_ESP32S3_ULP_COPROC_RESERVE_MEM 8176
+kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"Documentation/platforms/xtensa/esp32s3/boards/esp32s3-devkit/ulp_riscv_blink.bin"
+make olddefconfig
+make -j
+</pre></div>
+</div>
+</section>
+<section id="creating-an-ulp-risc-v-coprocessor-application">
+<h3>Creating an ULP RISC-V Coprocessor Application<a class="headerlink"
href="#creating-an-ulp-risc-v-coprocessor-application" title="Permalink to this
heading"></a></h3>
+<p>To use NuttX’s internal build system to compile the bare-metal ULP RISC-V
Coprocessor binary, check the following instructions.</p>
+<p>First, create a folder for the ULP source and header files. This folder is
just for ULP project and it is
+an independent project. Therefore, the NuttX example guide should not be
followed, and no Makefile or similar
+build files should be added. Also folder location could be anywhere. To
include ULP folder into build
+system don’t forget to set
<cite>CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH</cite> variable with path of the
ULP project folder relative to
+NuttX root folder. Instructions for setting up can be found above.</p>
+<p>NuttX’s internal functions or POSIX calls are not supported.</p>
+<p>Here is an example:</p>
+<ul class="simple">
+<li><p>ULP UART Snippet:</p></li>
+</ul>
+<div class="highlight-C notranslate"><div
class="highlight"><pre><span></span><span class="cp">#include</span><span
class="w"> </span><span class="cpf">"ulp_riscv.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_utils.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_print.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_uart_ulp_core.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"sdkconfig.h"</span>
+
+<span class="k">static</span><span class="w"> </span><span
class="n">ulp_riscv_uart_t</span><span class="w"> </span><span
class="n">s_print_uart</span><span class="p">;</span>
+
+<span class="kt">int</span><span class="w"> </span><span
class="nf">main</span><span class="w"> </span><span class="p">(</span><span
class="kt">void</span><span class="p">)</span>
+<span class="p">{</span>
+<span class="w"> </span><span class="n">ulp_riscv_uart_cfg_t</span><span
class="w"> </span><span class="n">cfg</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="p">.</span><span
class="n">tx_pin</span><span class="w"> </span><span class="o">=</span><span
class="w"> </span><span class="mi">0</span><span class="p">,</span>
+<span class="w"> </span><span class="p">};</span>
+<span class="w"> </span><span class="n">ulp_riscv_uart_init</span><span
class="p">(</span><span class="o">&</span><span
class="n">s_print_uart</span><span class="p">,</span><span class="w">
</span><span class="o">&</span><span class="n">cfg</span><span
class="p">);</span>
+<span class="w"> </span><span class="n">ulp_riscv_print_install</span><span
class="p">((</span><span class="n">putc_fn_t</span><span
class="p">)</span><span class="n">ulp_riscv_uart_putc</span><span
class="p">,</span><span class="w"> </span><span class="o">&</span><span
class="n">s_print_uart</span><span class="p">);</span>
+
+<span class="w"> </span><span class="k">while</span><span
class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="n">ulp_riscv_print_str</span><span
class="p">(</span><span class="s">"Hello from the LP core!!</span><span
class="se">\r\n</span><span class="s">"</span><span class="p">);</span>
+<span class="w"> </span><span class="n">ulp_riscv_delay_cycles</span><span
class="p">(</span><span class="mi">1000</span><span class="w"> </span><span
class="o">*</span><span class="w"> </span><span
class="n">ULP_RISCV_CYCLES_PER_MS</span><span class="p">);</span>
+<span class="w"> </span><span class="p">}</span>
+
+<span class="w"> </span><span class="k">return</span><span class="w">
</span><span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>For more information about ULP RISC-V Coprocessor examples <a
class="reference external"
href="https://github.com/espressif/esp-idf/tree/master/examples/system/ulp/lp_core";>check
here</a>.
+After these settings follow the same steps as for any other configuration to
build NuttX. Build system checks ULP project path,
+adds every source and header file into project and builds it.</p>
+<p>To sum up, here is an complete example. <cite>ulp_example/ulp
(../ulp_example/ulp)</cite> folder selected as example
+to create a subfolder for ULP but folder that includes ULP source code can be
anywhere:</p>
+<ul class="simple">
+<li><p>Tree view:</p></li>
+</ul>
+<div class="highlight-text notranslate"><div
class="highlight"><pre><span></span>nuttxspace/
+├── nuttx/
+└── apps/
+└── ulp_example/
+ └── ulp/
+ └── ulp_main.c
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>Contents in ulp_main.c:</p></li>
+</ul>
+<div class="highlight-C notranslate"><div
class="highlight"><pre><span></span><span class="cp">#include</span><span
class="w"> </span><span class="cpf"><stdio.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdint.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf"><stdbool.h></span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_utils.h"</span>
+<span class="cp">#include</span><span class="w"> </span><span
class="cpf">"ulp_riscv_gpio.h"</span>
+
+<span class="cp">#define GPIO_PIN 0</span>
+
+<span class="cp">#define nop() __asm__ __volatile__ ("nop")</span>
+
+<span class="kt">bool</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="nb">true</span><span
class="p">;</span>
+
+<span class="kt">int</span><span class="w"> </span><span
class="nf">main</span><span class="w"> </span><span class="p">(</span><span
class="kt">void</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="k">while</span><span class="w">
</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span
class="n">ulp_riscv_gpio_output_level</span><span class="p">(</span><span
class="n">GPIO_PIN</span><span class="p">,</span><span class="w"> </span><span
class="n">gpio_level_previous</span><span class="p">);</span>
+<span class="w"> </span><span class="n">gpio_level_previous</span><span
class="w"> </span><span class="o">=</span><span class="w"> </span><span
class="o">!</span><span class="n">gpio_level_previous</span><span
class="p">;</span>
+<span class="w"> </span><span class="k">for</span><span class="w">
</span><span class="p">(</span><span class="kt">int</span><span class="w">
</span><span class="n">i</span><span class="w"> </span><span
class="o">=</span><span class="w"> </span><span class="mi">0</span><span
class="p">;</span><span class="w"> </span><span class="n">i</span><span
class="w"> </span><span class="o"><</span><span class="w"> </span><span
class="mi">10000</span><span class="p">;</span><span class="w" [...]
+<span class="w"> </span><span class="p">{</span>
+<span class="w"> </span><span class="n">nop</span><span
class="p">();</span>
+<span class="w"> </span><span class="p">}</span>
+<span class="w"> </span><span class="p">}</span>
+
+<span class="w"> </span><span class="k">return</span><span class="w">
</span><span class="mi">0</span><span class="p">;</span>
+<span class="w"> </span><span class="p">}</span>
+</pre></div>
+</div>
+<ul>
+<li><p>Command to build:</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>make distclean
+./tools/configure.sh esp32s3-devkitc:nsh
+kconfig-tweak -e CONFIG_ESP32S3_ULP_COPROC_ENABLED
+kconfig-tweak --set-val CONFIG_ESP32S3_ULP_COPROC_RESERVE_MEM 8176
+kconfig-tweak -e CONFIG_DEV_GPIO
+kconfig-tweak --set-str CONFIG_ESPRESSIF_ULP_RISCV_PROJECT_PATH
"../ulp_example/ulp"
+make olddefconfig
+make -j
+</pre></div>
+</div>
+</li>
+</ul>
+</section>
+</section>
<section id="id1">
<h2><span class="target" id="managing-esptool-on-virtual-environment">Managing
esptool on virtual environment</span><a class="headerlink" href="#id1"
title="Permalink to this heading"></a></h2>
<p>This section describes how to install <code class="docutils literal
notranslate"><span class="pre">esptool</span></code>, <code class="docutils
literal notranslate"><span class="pre">imgtool</span></code> or any other
Python packages in a
diff --git a/content/docs/latest/searchindex.js
b/content/docs/latest/searchindex.js
index 40f0665a5..e4039acc7 100644
--- a/content/docs/latest/searchindex.js
+++ b/content/docs/latest/searchindex.js
@@ -1 +1 @@
-Search.setIndex({"docnames": ["_tags/arch-arm64", "_tags/arch-avr",
"_tags/arch-example", "_tags/arch-renesas", "_tags/chip-a527",
"_tags/chip-a64", "_tags/chip-at90usb", "_tags/chip-atmega",
"_tags/chip-atmega2560", "_tags/chip-bcm2711", "_tags/chip-esp32",
"_tags/chip-esp32a1s", "_tags/chip-esp32picod4", "_tags/chip-esp32s2",
"_tags/chip-esp32s3", "_tags/chip-esp32wroom32", "_tags/chip-esp32wrover32",
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index 551981fa4..6cf0d9940 100644
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