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github-bot pushed a commit to branch asf-site
in repository https://gitbox.apache.org/repos/asf/nuttx-website.git
The following commit(s) were added to refs/heads/asf-site by this push:
new 6ce00d8f08 Publishing web: 31ab6eb45e7903daced4cf8f07660e86e8a79bb7
docs: f47ff76589811abfc8534ca3303b7b50f99a2001
6ce00d8f08 is described below
commit 6ce00d8f086f5fa8f9e9b5045f35a07dc36a8e9b
Author: Tomasz 'CeDeROM' CEDRO <[email protected]>
AuthorDate: Wed Jan 14 00:37:38 2026 +0000
Publishing web: 31ab6eb45e7903daced4cf8f07660e86e8a79bb7 docs:
f47ff76589811abfc8534ca3303b7b50f99a2001
---
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index 7a97cd8144..13b82ff934 100644
--- a/content/docs/10.0.0/index.html
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index 0e9b7cd142..49b8928362 100644
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diff --git a/content/docs/12.8.0/index.html b/content/docs/12.8.0/index.html
index 6d0a33e62a..8910e6e3e8 100644
--- a/content/docs/12.8.0/index.html
+++ b/content/docs/12.8.0/index.html
@@ -183,7 +183,7 @@ 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: 13 January 26 at 00:24</p>
+<p>Last Updated: 14 January 26 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/12.8.0/searchindex.js
b/content/docs/12.8.0/searchindex.js
index d09b356387..6106d6fecb 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 2aeb67829a..647a1bd044 100644
--- a/content/docs/12.9.0/index.html
+++ b/content/docs/12.9.0/index.html
@@ -183,7 +183,7 @@ 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: 13 January 26 at 00:26</p>
+<p>Last Updated: 14 January 26 at 00:27</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 b36566485f..8021f01315 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/components/drivers/special/ioexpander.rst.txt
b/content/docs/latest/_sources/components/drivers/special/ioexpander.rst.txt
index 5a2f5134dd..f52f019df4 100644
--- a/content/docs/latest/_sources/components/drivers/special/ioexpander.rst.txt
+++ b/content/docs/latest/_sources/components/drivers/special/ioexpander.rst.txt
@@ -2,29 +2,37 @@
IO Expander Device Drivers
==========================
-- ``include/nuttx/ioexpander/ioexpander.h`` and
``include/nuttx/ioexpander/gpio.h``.
- All structures and APIs needed to work with ioexpander drivers are provided
in
- this header file.
+The IO Expander subsystem is defined in the following headers:
-- ``struct ioexpander_ops_s``. Each ioexpand device driver must implement
- an instance of ``struct ioexpander_ops_s``. That structure defines a
- call table with the methods, and we also provide macros to help access
methods.
+- ``include/nuttx/ioexpander/ioexpander.h`` — defines the public IO expander
+ interface: macros, types, and helper access macros used by drivers and
+ consumers.
+- ``include/nuttx/ioexpander/gpio.h`` — provides the "gpio lower half"
+ helper that allows registering an IO expander pin as a standard GPIO
+ character device (see ``gpio_lower_half`` and ``gpio_lower_half_byname``).
-- we also provide method ``gpio_lower_half`` to make ioexpander compatible
with normal gpio.
+Each IO expander driver must implement an instance of ``struct
+ioexpander_ops_s``. That structure defines the lower-half call table and
+the operations a driver must provide; the public header also includes
+helper macros that dispatch to the lower-half operations table.
-- **Binding ioexpander Drivers**. ioexpander drivers are not normally directly
- accessed by user code, we should always get lower level drivers, for
example I2C,
- and map extended gpio feature same asa normal gpio. See for example,
- ``int nrf52_sx1509_initialize(void)``
- in ``boards/arm/nrf52/thingy52/src/nrf52_sx1509.c``. In general, the binding
- sequence is:
+The helper ``gpio_lower_half`` can be used to register individual expander
+pins as standard GPIO devices so that upper-half GPIO consumers can access
+expander pins through the common GPIO character driver.
- #. Get an instance of ``struct i2c_master_s`` from the
- hardware-specific I2C device driver, and
- #. Provide that instance and configurations to the ioexpander
initialization method
- to get the ``struct ioexpander_dev_s`` ioe device instance.
- #. Then use ioe device instance to do ioexpander operations, or use
``gpio_lower_half``
- to make ioexpand compatible with normal gpio.
+**Binding IO expander drivers**
+
+IO expander drivers are usually bound by board-specific code rather than
+accessed directly from application code. For I2C- or SPI-connected
+expanders the typical sequence is:
+
+#. Obtain the bus instance (for example, a ``struct i2c_master_s *``) from
+ the hardware-specific bus driver.
+#. Call the expander driver's initialization routine with the bus instance
+ and device-specific configuration; the init routine returns a
+ ``struct ioexpander_dev_s *`` instance.
+#. Use the returned ``ioe`` instance directly, or register individual
+ expander pins with the upper-half GPIO driver via ``gpio_lower_half``.
- **Examples**: ``drivers/ioexpander/pca9555.c``,
@@ -33,3 +41,213 @@ IO Expander Device Drivers
``drivers/ioexpander/ioe_rpmsg.c``,
``boards/sim/sim/sim/src/sim_ioexpander.c``,
``boards/arm/nrf52/thingy52/src/nrf52_sx1509.c`` etc.
+
+Further details
+===============
+
+Header files
+------------
+
+The relevant header files are:
+
+- ``include/nuttx/ioexpander/ioexpander.h`` — defines macros, types and access
+ macros used to interact with IO expanders.
+- ``include/nuttx/ioexpander/gpio.h`` — provides the "gpio lower half" helper
+ that allows registering an IO expander pin as a standard GPIO device.
+
+Overview of key macros and options
+----------------------------------
+
+The following is a concise reference of the important macros defined in the
+header. These are the options you will typically use through
``IOEXP_SETOPTION``
+and the various access macros. The primary preprocessor definitions are
+listed below (C syntax):
+
+.. code-block:: c
+
+ /* Direction definitions */
+ #define IOEXPANDER_DIRECTION_IN 0 /* float */
+ #define IOEXPANDER_DIRECTION_IN_PULLUP 1
+ #define IOEXPANDER_DIRECTION_IN_PULLDOWN 2
+ #define IOEXPANDER_DIRECTION_OUT 3 /* push-pull */
+ #define IOEXPANDER_DIRECTION_OUT_OPENDRAIN 4
+ #define IOEXPANDER_DIRECTION_OUT_LED 5 /* LED output */
+
+ /* Pinset mask helpers */
+ #define IOEXPANDER_PINMASK (((ioe_pinset_t)1 << CONFIG_IOEXPANDER_NPINS) -
1)
+ #define PINSET_ALL (~((ioe_pinset_t)0))
+
+ /* Common option values (used with IOEXP_SETOPTION) */
+ /* Invert (active level) */
+ #define IOEXPANDER_OPTION_INVERT 1
+ #define IOEXPANDER_VAL_NORMAL 0 /* normal polarity */
+ #define IOEXPANDER_VAL_INVERT 1 /* inverted polarity */
+
+ /* Interrupt configuration (level/edge and high/low/rising/falling/both) */
+ #define IOEXPANDER_OPTION_INTCFG 2
+ #define IOEXPANDER_VAL_DISABLE 0 /* 0000 disable interrupts */
+ #define IOEXPANDER_VAL_LEVEL 1 /* xx01: level triggered */
+ #define IOEXPANDER_VAL_EDGE 2 /* xx10: edge triggered */
+ #define IOEXPANDER_VAL_HIGH 5 /* 0101: high level */
+ #define IOEXPANDER_VAL_LOW 9 /* 1001: low level */
+ #define IOEXPANDER_VAL_RISING 6 /* 0110: rising edge */
+ #define IOEXPANDER_VAL_FALLING 10 /* 1010: falling edge */
+ #define IOEXPANDER_VAL_BOTH 14 /* 1110: both edges */
+
+ /* LED configuration */
+ #define IOEXPANDER_OPTION_LEDCFG 3 /* assign an LED number to a pin */
+
+ /* Non-generic (driver-specific) option */
+ #define IOEXPANDER_OPTION_NONGENERIC 4 /* pass driver-specific struct */
+
+ /* Wakeup configuration (configure pin as SoC wake-up source) */
+ #define IOEXPANDER_OPTION_WAKEUPCFG 5
+ #define IOEXPANDER_WAKEUP_DISABLE 0
+ #define IOEXPANDER_WAKEUP_ENABLE 1
+
+ /* Debounce and interrupt mask (recent additions) */
+ #define IOEXPANDER_OPTION_SETDEBOUNCE 6 /* configure debounce */
+ #define IOEXPANDER_DEBOUNCE_DISABLE 0
+ #define IOEXPANDER_DEBOUNCE_ENABLE 1
+
+ #define IOEXPANDER_OPTION_SETMASK 7 /* control interrupt masking */
+ #define IOEXPANDER_MASK_DISABLE 0 /* unmask (enable) interrupts */
+ #define IOEXPANDER_MASK_ENABLE 1 /* mask (suppress) interrupts */
+
+Access macros (API)
+-------------------
+
+The header exposes a set of helper macros that dispatch to the underlying
+driver operations table (``struct ioexpander_ops_s``):
+
+.. c:macro:: IOEXP_SETDIRECTION(dev, pin, dir)
+
+ Set a pin direction (input, output, open-drain, LED, pull-up/down).
+ Returns 0 on success or a negative errno on failure.
+
+.. c:macro:: IOEXP_SETOPTION(dev, pin, opt, val)
+
+ Generic option setting interface used to configure the options listed
+ above. Note that ``val`` is a ``void *``; drivers may accept an integer
+ casted to a pointer or a pointer to a driver-specific structure.
+
+ Examples::
+
+ /* Invert pin polarity */
+ IOEXP_SETOPTION(dev, 3, IOEXPANDER_OPTION_INVERT,
+ (FAR void *)IOEXPANDER_VAL_INVERT);
+
+ /* Enable debounce on pin 2 */
+ IOEXP_SETOPTION(dev, 2, IOEXPANDER_OPTION_SETDEBOUNCE,
+ (FAR void *)IOEXPANDER_DEBOUNCE_ENABLE);
+
+ /* Mask interrupts for pin 5 */
+ IOEXP_SETOPTION(dev, 5, IOEXPANDER_OPTION_SETMASK,
+ (FAR void *)IOEXPANDER_MASK_ENABLE);
+
+.. c:macro:: IOEXP_WRITEPIN(dev, pin, val)
+
+ Set the pin level. Returns 0 on success or a negative errno on error.
+
+.. c:macro:: IOEXP_READPIN(dev, pin, valptr)
+
+ Read the actual physical pin level. The value is returned via ``valptr``.
+
+.. c:macro:: IOEXP_READBUF(dev, pin, valptr)
+
+ Read the buffered/register value cached by the expander.
+
+ - ``IOEXP_WRITEPIN`` sets the pin level (TRUE typically means high).
+ Drivers handle polarity inversion if configured.
+ - ``IOEXP_READPIN`` reads the actual physical pin level.
+ - ``IOEXP_READBUF`` reads the buffered/register value cached by the
+ expander.
+
+Multi-pin operations
+--------------------
+
+When ``CONFIG_IOEXPANDER_MULTIPIN`` is enabled, batch operations are
+available that may be more efficient than repeated single-pin calls:
+
+- ``IOEXP_MULTIWRITEPIN(dev, pins, vals, count)``
+- ``IOEXP_MULTIREADPIN(dev, pins, vals, count)``
+- ``IOEXP_MULTIREADBUF(dev, pins, vals, count)``
+
+Interrupts and callbacks
+------------------------
+
+If ``CONFIG_IOEXPANDER_INT_ENABLE`` is enabled the header defines the
+callback type and attach/detach helper macros. The callback signature
+is::
+
+ typedef CODE int (*ioe_callback_t)(FAR struct ioexpander_dev_s *dev,
+ ioe_pinset_t pinset,
FAR void *arg);
+
+The callback is invoked when events occur for the monitored pinset. The
+attach/detach helpers are provided as macros that dispatch to the lower-half
+driver when ``CONFIG_IOEXPANDER_INT_ENABLE`` is enabled:
+
+.. c:macro:: IOEP_ATTACH(dev, pinset, callback, arg)
+
+ Attach and enable a pin interrupt callback. Returns a non-NULL opaque
+ handle on success. ``pinset`` selects which pin(s) will generate the
+ callback; ``callback`` is a function of type ``ioe_callback_t`` and
+ ``arg`` is passed through to the callback.
+
+.. c:macro:: IOEP_DETACH(dev, handle)
+
+ Detach and disable a previously attached callback referenced by ``handle``.
+
+Note: when ``CONFIG_IOEXPANDER_NPINS`` > 64, ``ioe_pinset_t`` represents a
+single interrupt pin number rather than a bitmask.
+
+Driver interface (lower-half)
+-----------------------------
+
+Each IO expander driver must implement the operations table
+``struct ioexpander_ops_s``. At minimum the driver should provide:
+
+- ``ioe_direction``
+- ``ioe_option``
+- ``ioe_writepin``
+- ``ioe_readpin``
+- ``ioe_readbuf``
+
+Optional multi-pin and interrupt attach/detach methods should be provided
+when the corresponding configuration options are enabled.
+
+Binding to the upper layer (gpio_lower_half)
+--------------------------------------------
+
+Applications normally do not access IO expander drivers directly. Typical
+binding steps are:
+
+1. Obtain the bus instance (for example, ``struct i2c_master_s *``) from
+ the hardware-specific bus driver.
+2. Call the expander driver's initialization routine with the bus instance
+ and device configuration to obtain a ``struct ioexpander_dev_s *``.
+3. Use the returned ``ioe`` instance directly, or register individual
+ expander pins as standard GPIO devices via ``gpio_lower_half`` or
+ ``gpio_lower_half_byname``.
+
+Example (pseudocode)::
+
+ /* Get the I2C bus */
+ struct i2c_master_s *i2c = up_i2cinitialize(0);
+
+ /* Initialize the expander (driver-specific init) */
+ struct ioexpander_dev_s *ioe = pca9555_initialize(i2c, CONFIG_PCA9555_ADDR);
+
+ /* Configure pin 0 as input with pull-up and enable debounce */
+ IOEXP_SETDIRECTION(ioe, 0, IOEXPANDER_DIRECTION_IN_PULLUP);
+ IOEXP_SETOPTION(ioe, 0, IOEXPANDER_OPTION_SETDEBOUNCE,
+ (FAR void *)IOEXPANDER_DEBOUNCE_ENABLE);
+
+Examples and references
+-----------------------
+
+See the following drivers and board examples for concrete usage:
+
+- ``drivers/ioexpander/pca9555.c`` — I2C IO expander implementation.
+- ``drivers/ioexpander/ioe_rpmsg.c`` — RPMSG-based IO expander.
+- ``boards/arm/nrf52/thingy52/src/nrf52_sx1509.c`` — binding example.
diff --git a/content/docs/latest/_sources/reference/os/nuttx.rst.txt
b/content/docs/latest/_sources/reference/os/nuttx.rst.txt
index 9e38497342..04c8b60643 100644
--- a/content/docs/latest/_sources/reference/os/nuttx.rst.txt
+++ b/content/docs/latest/_sources/reference/os/nuttx.rst.txt
@@ -22,16 +22,6 @@ OS List Management APIs
periodically -- the calling interval must be
``CONFIG_USEC_PER_TICK``.
-.. c:function:: void nxsched_tick_expiration(void)
-
- Description: if ``CONFIG_SCHED_TICKLESS`` is defined, then this
- function is provided by the RTOS base code and called from
- platform-specific code when the interval timer used to implemented
- the tick-less OS expires.
-
- **Assumptions**: Base code implementation assumes that this
- function is called from interrupt handling logic with interrupts disabled.
-
.. c:function:: void irq_dispatch(int irq, FAR void *context)
This function must be called from the
diff --git a/content/docs/latest/_sources/reference/os/time_clock.rst.txt
b/content/docs/latest/_sources/reference/os/time_clock.rst.txt
index c679ea949b..f178f98075 100644
--- a/content/docs/latest/_sources/reference/os/time_clock.rst.txt
+++ b/content/docs/latest/_sources/reference/os/time_clock.rst.txt
@@ -372,7 +372,7 @@ In addition to these imported interfaces, the RTOS will
export the
following interfaces for use by the platform-specific interval
timer implementation:
-- ``nxsched_tick_expiration()``: called by the platform-specific logic when
the interval time expires.
+- ``nxsched_process_timer()``: called by the platform-specific logic when the
interval time expires.
.. c:function:: void archname_timer_initialize(void)
@@ -410,7 +410,7 @@ timer implementation:
Cancel the alarm and return the time of cancellation of the alarm.
These two steps need to be as nearly atomic as possible.
- ``nxsched_tick_expiration()`` will not be called unless the alarm
+ ``nxsched_process_timer()`` will not be called unless the alarm
is restarted with ``up_alarm_start()``. If, as a race condition,
the alarm has already expired when this function is called, then
time returned is the current time.
@@ -427,13 +427,13 @@ timer implementation:
.. c:function:: int up_alarm_start(FAR const struct timespec *ts)
- Start the alarm. ``nxsched_tick_expiration()`` will be called
+ Start the alarm. ``nxsched_process_timer()`` will be called
when the alarm occurs (unless ``up_alarm_cancel`` is called to
stop it).
:param ts: The time in the future at the alarm is expected to
occur. When the alarm occurs the timer logic will call
- ``nxsched_tick_expiration()``.
+ ``nxsched_process_timer()``.
:return: Zero (OK) on success; a negated errno value on failure.
@@ -445,11 +445,11 @@ timer implementation:
Cancel the interval timer and return the time remaining on the
timer. These two steps need to be as nearly atomic as possible.
-``nxsched_tick_expiration()`` will not be called unless the timer
+``nxsched_process_timer()`` will not be called unless the timer
is restarted with ``up_timer_start()``. If, as a race condition,
the timer has already expired when this function is called, then
that pending interrupt must be cleared so that
-``nxsched_tick_expiration()`` is not called spuriously and the
+``nxsched_process_timer()`` is not called spuriously and the
remaining time of zero should be returned.
:param ts: Location to return the remaining time. Zero should be
@@ -463,12 +463,12 @@ disabled internally to assure non-reentrancy.
.. c:function:: int up_timer_start(FAR const struct timespec *ts)
-Start the interval timer. ``nxsched_tick_expiration()`` will be
+Start the interval timer. ``nxsched_process_timer()`` will be
called at the completion of the timeout (unless
``up_timer_cancel()`` is called to stop the timing).
:param ts: Provides the time interval until
- ``nxsched_tick_expiration()`` is called.
+ ``nxsched_process_timer()`` is called.
:return: Zero (OK) on success; a negated errno value on failure.
@@ -564,41 +564,6 @@ or ``kill()`` to communicate with NuttX tasks.
context of the timer interrupt handler and is subject to all ISR
restrictions.
-.. c:function:: int wd_restart(FAR struct wdog_s *wdog, clock_t delay)
-
- This function restarts the specified watchdog timer using the same
- function and argument that were specified in the previous wd_start()
- call, but with a new delay value. It can be used when the user wants
- to restart the same watchdog with a different timeout value, or to
- refresh (feed) an existing watchdog before it expires.
-
- :param wdog: Pointer to the watchdog timer to restart
- :param delay: Delay count in clock ticks
-
- **NOTE**: The parameter must be of type ``wdparm_t``.
-
- :return: Zero (``OK``) is returned on success; a negated ``errno`` value
- is return to indicate the nature of any failure.
-
-.. c:function:: int wd_restart_next(FAR struct wdog_s *wdog, clock_t delay)
-
- This function restarts the specified watchdog timer using a new delay
- value, but schedules the next expiration based on the previous
- expiration time (wdog->expired + delay). This allows the watchdog to
- maintain a consistent periodic interval even if there is some delay in
- handling the expiration callback.
-
- It can be used when the user wants to restart a watchdog for a different
- purpose or continue periodic timing based on the previous timeout point.
-
- :param wdog: Pointer to the watchdog timer to restart
- :param delay: Delay count in clock ticks
-
- **NOTE**: The parameter must be of type ``wdparm_t``.
-
- :return: Zero (``OK``) is returned on success; a negated ``errno`` value
- is return to indicate the nature of any failure.
-
.. c:function:: int wd_cancel(FAR struct wdog_s *wdog)
This function cancels a currently running
@@ -745,12 +710,15 @@ that returns immediately without waiting for the timer to
stop executing.
**POSIX Compatibility:** This is a NON-POSIX interface.
-.. c:function:: int hrtimer_start(FAR hrtimer_t *hrtimer, uint64_t ns, \
+.. c:function:: int hrtimer_start(FAR hrtimer_t *hrtimer, \
+ hrtimer_entry_t func, \
+ uint64_t expired, \
enum hrtimer_mode_e mode)
This function starts a high-resolution timer in absolute or relative mode.
:param hrtimer: Timer instance to cancel
+ :param func: Expiration callback function
:param ns: Timer expiration in nanoseconds (absolute or relative)
:param mode: HRTIMER_MODE_ABS or HRTIMER_MODE_REL
@@ -758,7 +726,8 @@ that returns immediately without waiting for the timer to
stop executing.
**POSIX Compatibility:** This is a NON-POSIX interface.
-.. c:type:: uint64_t (*hrtimer_cb)(FAR hrtimer_t *hrtimer, uint64_t expired)
+.. c:type:: uint64_t (*hrtimer_entry_t)(FAR hrtimer_t *hrtimer, \
+ uint64_t expired)
**High-resolution Timer Callback**: when a hrtimer expires,
the callback function with this type is called.
diff --git a/content/docs/latest/components/drivers/special/index.html
b/content/docs/latest/components/drivers/special/index.html
index d803827235..c91b53f171 100644
--- a/content/docs/latest/components/drivers/special/index.html
+++ b/content/docs/latest/components/drivers/special/index.html
@@ -308,7 +308,20 @@ and thus expose them to applications.</p>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="i3c.html">I3C
Device Drivers</a></li>
-<li class="toctree-l1"><a class="reference internal" href="ioexpander.html">IO
Expander Device Drivers</a></li>
+<li class="toctree-l1"><a class="reference internal" href="ioexpander.html">IO
Expander Device Drivers</a><ul>
+<li class="toctree-l2"><a class="reference internal"
href="ioexpander.html#further-details">Further details</a><ul>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#header-files">Header files</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#overview-of-key-macros-and-options">Overview of key
macros and options</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#access-macros-api">Access macros (API)</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#multi-pin-operations">Multi-pin operations</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#interrupts-and-callbacks">Interrupts and
callbacks</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#driver-interface-lower-half">Driver interface
(lower-half)</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#binding-to-the-upper-layer-gpio-lower-half">Binding to
the upper layer (gpio_lower_half)</a></li>
+<li class="toctree-l3"><a class="reference internal"
href="ioexpander.html#examples-and-references">Examples and references</a></li>
+</ul>
+</li>
+</ul>
+</li>
<li class="toctree-l1"><a class="reference internal" href="lcd.html">LCD
Character Drivers</a><ul>
<li class="toctree-l2"><a class="reference internal"
href="lcd.html#binding">Binding</a><ul>
<li class="toctree-l3"><a class="reference internal"
href="lcd.html#generic-lcd-character-driver">Generic LCD Character
Driver</a></li>
diff --git a/content/docs/latest/components/drivers/special/ioexpander.html
b/content/docs/latest/components/drivers/special/ioexpander.html
index 7db4b3edf5..362f3598d5 100644
--- a/content/docs/latest/components/drivers/special/ioexpander.html
+++ b/content/docs/latest/components/drivers/special/ioexpander.html
@@ -150,7 +150,10 @@
<li class="toctree-l4"><a class="reference internal"
href="i2c.html#i2c-bit-bang-driver">I2C Bit-Bang Driver</a></li>
<li class="toctree-l4"><a class="reference internal"
href="i2c.html#i2c-slave-device-drivers">I2C Slave Device Drivers</a></li>
<li class="toctree-l4"><a class="reference internal" href="i3c.html">I3C
Device Drivers</a></li>
-<li class="toctree-l4 current"><a class="current reference internal"
href="#">IO Expander Device Drivers</a></li>
+<li class="toctree-l4 current"><a class="current reference internal"
href="#">IO Expander Device Drivers</a><ul>
+<li class="toctree-l5"><a class="reference internal"
href="#further-details">Further details</a></li>
+</ul>
+</li>
<li class="toctree-l4"><a class="reference internal" href="lcd.html">LCD
Character Drivers</a></li>
<li class="toctree-l4"><a class="reference internal"
href="mtd/index.html">Memory Technology Device Drivers</a></li>
<li class="toctree-l4"><a class="reference internal"
href="regmap.html">drivers/regmap</a></li>
@@ -248,29 +251,42 @@
<section id="io-expander-device-drivers">
<h1>IO Expander Device Drivers<a class="headerlink"
href="#io-expander-device-drivers" title="Permalink to this heading"></a></h1>
+<p>The IO Expander subsystem is defined in the following headers:</p>
<ul class="simple">
-<li><p><code class="docutils literal notranslate"><span
class="pre">include/nuttx/ioexpander/ioexpander.h</span></code> and <code
class="docutils literal notranslate"><span
class="pre">include/nuttx/ioexpander/gpio.h</span></code>.
-All structures and APIs needed to work with ioexpander drivers are provided in
-this header file.</p></li>
-<li><p><code class="docutils literal notranslate"><span
class="pre">struct</span> <span class="pre">ioexpander_ops_s</span></code>.
Each ioexpand device driver must implement
-an instance of <code class="docutils literal notranslate"><span
class="pre">struct</span> <span class="pre">ioexpander_ops_s</span></code>.
That structure defines a
-call table with the methods, and we also provide macros to help access
methods.</p></li>
-<li><p>we also provide method <code class="docutils literal notranslate"><span
class="pre">gpio_lower_half</span></code> to make ioexpander compatible with
normal gpio.</p></li>
-<li><p><strong>Binding ioexpander Drivers</strong>. ioexpander drivers are not
normally directly
-accessed by user code, we should always get lower level drivers, for example
I2C,
-and map extended gpio feature same asa normal gpio. See for example,
-<code class="docutils literal notranslate"><span class="pre">int</span> <span
class="pre">nrf52_sx1509_initialize(void)</span></code>
-in <code class="docutils literal notranslate"><span
class="pre">boards/arm/nrf52/thingy52/src/nrf52_sx1509.c</span></code>. In
general, the binding
-sequence is:</p>
+<li><dl class="simple">
+<dt><code class="docutils literal notranslate"><span
class="pre">include/nuttx/ioexpander/ioexpander.h</span></code> — defines the
public IO expander</dt><dd><p>interface: macros, types, and helper access
macros used by drivers and
+consumers.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt><code class="docutils literal notranslate"><span
class="pre">include/nuttx/ioexpander/gpio.h</span></code> — provides the “gpio
lower half”</dt><dd><p>helper that allows registering an IO expander pin as a
standard GPIO
+character device (see <code class="docutils literal notranslate"><span
class="pre">gpio_lower_half</span></code> and <code class="docutils literal
notranslate"><span class="pre">gpio_lower_half_byname</span></code>).</p>
+</dd>
+</dl>
+</li>
+</ul>
+<p>Each IO expander driver must implement an instance of <code class="docutils
literal notranslate"><span class="pre">struct</span>
+<span class="pre">ioexpander_ops_s</span></code>. That structure defines the
lower-half call table and
+the operations a driver must provide; the public header also includes
+helper macros that dispatch to the lower-half operations table.</p>
+<p>The helper <code class="docutils literal notranslate"><span
class="pre">gpio_lower_half</span></code> can be used to register individual
expander
+pins as standard GPIO devices so that upper-half GPIO consumers can access
+expander pins through the common GPIO character driver.</p>
+<p><strong>Binding IO expander drivers</strong></p>
+<p>IO expander drivers are usually bound by board-specific code rather than
+accessed directly from application code. For I2C- or SPI-connected
+expanders the typical sequence is:</p>
<ol class="arabic simple">
-<li><p>Get an instance of <code class="docutils literal notranslate"><span
class="pre">struct</span> <span class="pre">i2c_master_s</span></code> from the
-hardware-specific I2C device driver, and</p></li>
-<li><p>Provide that instance and configurations to the ioexpander
initialization method
-to get the <code class="docutils literal notranslate"><span
class="pre">struct</span> <span class="pre">ioexpander_dev_s</span></code> ioe
device instance.</p></li>
-<li><p>Then use ioe device instance to do ioexpander operations, or use <code
class="docutils literal notranslate"><span
class="pre">gpio_lower_half</span></code>
-to make ioexpand compatible with normal gpio.</p></li>
+<li><p>Obtain the bus instance (for example, a <code class="docutils literal
notranslate"><span class="pre">struct</span> <span
class="pre">i2c_master_s</span> <span class="pre">*</span></code>) from
+the hardware-specific bus driver.</p></li>
+<li><p>Call the expander driver’s initialization routine with the bus instance
+and device-specific configuration; the init routine returns a
+<code class="docutils literal notranslate"><span class="pre">struct</span>
<span class="pre">ioexpander_dev_s</span> <span class="pre">*</span></code>
instance.</p></li>
+<li><p>Use the returned <code class="docutils literal notranslate"><span
class="pre">ioe</span></code> instance directly, or register individual
+expander pins with the upper-half GPIO driver via <code class="docutils
literal notranslate"><span class="pre">gpio_lower_half</span></code>.</p></li>
</ol>
-</li>
+<ul class="simple">
<li><p><strong>Examples</strong>: <code class="docutils literal
notranslate"><span class="pre">drivers/ioexpander/pca9555.c</span></code>,
<code class="docutils literal notranslate"><span
class="pre">drivers/input/aw86225.c</span></code>,
<code class="docutils literal notranslate"><span
class="pre">drivers/analog/lmp92001.c</span></code>,
@@ -278,6 +294,240 @@ to make ioexpand compatible with normal gpio.</p></li>
<code class="docutils literal notranslate"><span
class="pre">boards/sim/sim/sim/src/sim_ioexpander.c</span></code>,
<code class="docutils literal notranslate"><span
class="pre">boards/arm/nrf52/thingy52/src/nrf52_sx1509.c</span></code>
etc.</p></li>
</ul>
+<section id="further-details">
+<h2>Further details<a class="headerlink" href="#further-details"
title="Permalink to this heading"></a></h2>
+<section id="header-files">
+<h3>Header files<a class="headerlink" href="#header-files" title="Permalink to
this heading"></a></h3>
+<p>The relevant header files are:</p>
+<ul class="simple">
+<li><dl class="simple">
+<dt><code class="docutils literal notranslate"><span
class="pre">include/nuttx/ioexpander/ioexpander.h</span></code> — defines
macros, types and access</dt><dd><p>macros used to interact with IO
expanders.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt><code class="docutils literal notranslate"><span
class="pre">include/nuttx/ioexpander/gpio.h</span></code> — provides the “gpio
lower half” helper</dt><dd><p>that allows registering an IO expander pin as a
standard GPIO device.</p>
+</dd>
+</dl>
+</li>
+</ul>
+</section>
+<section id="overview-of-key-macros-and-options">
+<h3>Overview of key macros and options<a class="headerlink"
href="#overview-of-key-macros-and-options" title="Permalink to this
heading"></a></h3>
+<p>The following is a concise reference of the important macros defined in the
+header. These are the options you will typically use through <code
class="docutils literal notranslate"><span
class="pre">IOEXP_SETOPTION</span></code>
+and the various access macros. The primary preprocessor definitions are
+listed below (C syntax):</p>
+<div class="highlight-c notranslate"><div
class="highlight"><pre><span></span><span class="cm">/* Direction definitions
*/</span>
+<span class="cp">#define IOEXPANDER_DIRECTION_IN 0 </span><span
class="cm">/* float */</span>
+<span class="cp">#define IOEXPANDER_DIRECTION_IN_PULLUP 1</span>
+<span class="cp">#define IOEXPANDER_DIRECTION_IN_PULLDOWN 2</span>
+<span class="cp">#define IOEXPANDER_DIRECTION_OUT 3 </span><span
class="cm">/* push-pull */</span>
+<span class="cp">#define IOEXPANDER_DIRECTION_OUT_OPENDRAIN 4</span>
+<span class="cp">#define IOEXPANDER_DIRECTION_OUT_LED 5 </span><span
class="cm">/* LED output */</span>
+
+<span class="cm">/* Pinset mask helpers */</span>
+<span class="cp">#define IOEXPANDER_PINMASK (((ioe_pinset_t)1 <<
CONFIG_IOEXPANDER_NPINS) - 1)</span>
+<span class="cp">#define PINSET_ALL (~((ioe_pinset_t)0))</span>
+
+<span class="cm">/* Common option values (used with IOEXP_SETOPTION) */</span>
+<span class="cm">/* Invert (active level) */</span>
+<span class="cp">#define IOEXPANDER_OPTION_INVERT 1</span>
+<span class="cp">#define IOEXPANDER_VAL_NORMAL 0 </span><span
class="cm">/* normal polarity */</span>
+<span class="cp">#define IOEXPANDER_VAL_INVERT 1 </span><span
class="cm">/* inverted polarity */</span>
+
+<span class="cm">/* Interrupt configuration (level/edge and
high/low/rising/falling/both) */</span>
+<span class="cp">#define IOEXPANDER_OPTION_INTCFG 2</span>
+<span class="cp">#define IOEXPANDER_VAL_DISABLE 0 </span><span
class="cm">/* 0000 disable interrupts */</span>
+<span class="cp">#define IOEXPANDER_VAL_LEVEL 1 </span><span
class="cm">/* xx01: level triggered */</span>
+<span class="cp">#define IOEXPANDER_VAL_EDGE 2 </span><span
class="cm">/* xx10: edge triggered */</span>
+<span class="cp">#define IOEXPANDER_VAL_HIGH 5 </span><span
class="cm">/* 0101: high level */</span>
+<span class="cp">#define IOEXPANDER_VAL_LOW 9 </span><span
class="cm">/* 1001: low level */</span>
+<span class="cp">#define IOEXPANDER_VAL_RISING 6 </span><span
class="cm">/* 0110: rising edge */</span>
+<span class="cp">#define IOEXPANDER_VAL_FALLING 10 </span><span
class="cm">/* 1010: falling edge */</span>
+<span class="cp">#define IOEXPANDER_VAL_BOTH 14 </span><span
class="cm">/* 1110: both edges */</span>
+
+<span class="cm">/* LED configuration */</span>
+<span class="cp">#define IOEXPANDER_OPTION_LEDCFG 3 </span><span
class="cm">/* assign an LED number to a pin */</span>
+
+<span class="cm">/* Non-generic (driver-specific) option */</span>
+<span class="cp">#define IOEXPANDER_OPTION_NONGENERIC 4 </span><span
class="cm">/* pass driver-specific struct */</span>
+
+<span class="cm">/* Wakeup configuration (configure pin as SoC wake-up source)
*/</span>
+<span class="cp">#define IOEXPANDER_OPTION_WAKEUPCFG 5</span>
+<span class="cp">#define IOEXPANDER_WAKEUP_DISABLE 0</span>
+<span class="cp">#define IOEXPANDER_WAKEUP_ENABLE 1</span>
+
+<span class="cm">/* Debounce and interrupt mask (recent additions) */</span>
+<span class="cp">#define IOEXPANDER_OPTION_SETDEBOUNCE 6 </span><span
class="cm">/* configure debounce */</span>
+<span class="cp">#define IOEXPANDER_DEBOUNCE_DISABLE 0</span>
+<span class="cp">#define IOEXPANDER_DEBOUNCE_ENABLE 1</span>
+
+<span class="cp">#define IOEXPANDER_OPTION_SETMASK 7 </span><span
class="cm">/* control interrupt masking */</span>
+<span class="cp">#define IOEXPANDER_MASK_DISABLE 0 </span><span
class="cm">/* unmask (enable) interrupts */</span>
+<span class="cp">#define IOEXPANDER_MASK_ENABLE 1 </span><span
class="cm">/* mask (suppress) interrupts */</span>
+</pre></div>
+</div>
+</section>
+<section id="access-macros-api">
+<h3>Access macros (API)<a class="headerlink" href="#access-macros-api"
title="Permalink to this heading"></a></h3>
+<p>The header exposes a set of helper macros that dispatch to the underlying
+driver operations table (<code class="docutils literal notranslate"><span
class="pre">struct</span> <span class="pre">ioexpander_ops_s</span></code>):</p>
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEXP_SETDIRECTION">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEXP_SETDIRECTION</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">pin</span></span>, <span class="n"><span
class="pre">dir</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.IOEXP_SETDIRECTION" title="Permalink to this
definition"></a><br /></dt>
+<dd><p>Set a pin direction (input, output, open-drain, LED, pull-up/down).
+Returns 0 on success or a negative errno on failure.</p>
+</dd></dl>
+
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEXP_SETOPTION">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEXP_SETOPTION</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">pin</span></span>, <span class="n"><span
class="pre">opt</span></span>, <span class="n"><span
class="pre">val</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.IOEXP_SETOPTION" title="Permalink to this
definition"></a><br /></dt>
+<dd><p>Generic option setting interface used to configure the options listed
+above. Note that <code class="docutils literal notranslate"><span
class="pre">val</span></code> is a <code class="docutils literal
notranslate"><span class="pre">void</span> <span class="pre">*</span></code>;
drivers may accept an integer
+casted to a pointer or a pointer to a driver-specific structure.</p>
+<p>Examples:</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>/* Invert pin polarity */
+IOEXP_SETOPTION(dev, 3, IOEXPANDER_OPTION_INVERT,
+ (FAR void *)IOEXPANDER_VAL_INVERT);
+
+/* Enable debounce on pin 2 */
+IOEXP_SETOPTION(dev, 2, IOEXPANDER_OPTION_SETDEBOUNCE,
+ (FAR void *)IOEXPANDER_DEBOUNCE_ENABLE);
+
+/* Mask interrupts for pin 5 */
+IOEXP_SETOPTION(dev, 5, IOEXPANDER_OPTION_SETMASK,
+ (FAR void *)IOEXPANDER_MASK_ENABLE);
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEXP_WRITEPIN">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEXP_WRITEPIN</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">pin</span></span>, <span class="n"><span
class="pre">val</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.IOEXP_WRITEPIN" title="Permalink to this
definition"></a><br /></dt>
+<dd><p>Set the pin level. Returns 0 on success or a negative errno on
error.</p>
+</dd></dl>
+
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEXP_READPIN">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEXP_READPIN</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">pin</span></span>, <span class="n"><span
class="pre">valptr</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.IOEXP_READPIN" title="Permalink to this
definition"></a><br /></dt>
+<dd><p>Read the actual physical pin level. The value is returned via <code
class="docutils literal notranslate"><span class="pre">valptr</span></code>.</p>
+</dd></dl>
+
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEXP_READBUF">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEXP_READBUF</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">pin</span></span>, <span class="n"><span
class="pre">valptr</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.IOEXP_READBUF" title="Permalink to this
definition"></a><br /></dt>
+<dd><p>Read the buffered/register value cached by the expander.</p>
+<ul class="simple">
+<li><p><code class="docutils literal notranslate"><span
class="pre">IOEXP_WRITEPIN</span></code> sets the pin level (TRUE typically
means high).
+Drivers handle polarity inversion if configured.</p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">IOEXP_READPIN</span></code> reads the actual physical pin
level.</p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">IOEXP_READBUF</span></code> reads the buffered/register value
cached by the
+expander.</p></li>
+</ul>
+</dd></dl>
+
+</section>
+<section id="multi-pin-operations">
+<h3>Multi-pin operations<a class="headerlink" href="#multi-pin-operations"
title="Permalink to this heading"></a></h3>
+<p>When <code class="docutils literal notranslate"><span
class="pre">CONFIG_IOEXPANDER_MULTIPIN</span></code> is enabled, batch
operations are
+available that may be more efficient than repeated single-pin calls:</p>
+<ul class="simple">
+<li><p><code class="docutils literal notranslate"><span
class="pre">IOEXP_MULTIWRITEPIN(dev,</span> <span class="pre">pins,</span>
<span class="pre">vals,</span> <span class="pre">count)</span></code></p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">IOEXP_MULTIREADPIN(dev,</span> <span class="pre">pins,</span> <span
class="pre">vals,</span> <span class="pre">count)</span></code></p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">IOEXP_MULTIREADBUF(dev,</span> <span class="pre">pins,</span> <span
class="pre">vals,</span> <span class="pre">count)</span></code></p></li>
+</ul>
+</section>
+<section id="interrupts-and-callbacks">
+<h3>Interrupts and callbacks<a class="headerlink"
href="#interrupts-and-callbacks" title="Permalink to this heading"></a></h3>
+<p>If <code class="docutils literal notranslate"><span
class="pre">CONFIG_IOEXPANDER_INT_ENABLE</span></code> is enabled the header
defines the
+callback type and attach/detach helper macros. The callback signature
+is:</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>typedef CODE int (*ioe_callback_t)(FAR
struct ioexpander_dev_s *dev,
+ ioe_pinset_t pinset, FAR
void *arg);
+</pre></div>
+</div>
+<p>The callback is invoked when events occur for the monitored pinset. The
+attach/detach helpers are provided as macros that dispatch to the lower-half
+driver when <code class="docutils literal notranslate"><span
class="pre">CONFIG_IOEXPANDER_INT_ENABLE</span></code> is enabled:</p>
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEP_ATTACH">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEP_ATTACH</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">pinset</span></span>, <span class="n"><span
class="pre">callback</span></span>, <span class="n"><span
class="pre">arg</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.IOEP_ATTACH" title="Permalink to this
definition"></a><br /></dt>
+<dd><p>Attach and enable a pin interrupt callback. Returns a non-NULL opaque
+handle on success. <code class="docutils literal notranslate"><span
class="pre">pinset</span></code> selects which pin(s) will generate the
+callback; <code class="docutils literal notranslate"><span
class="pre">callback</span></code> is a function of type <code class="docutils
literal notranslate"><span class="pre">ioe_callback_t</span></code> and
+<code class="docutils literal notranslate"><span class="pre">arg</span></code>
is passed through to the callback.</p>
+</dd></dl>
+
+<dl class="c macro">
+<dt class="sig sig-object c" id="c.IOEP_DETACH">
+<span class="sig-name descname"><span class="n"><span
class="pre">IOEP_DETACH</span></span></span><span
class="sig-paren">(</span><span class="n"><span class="pre">dev</span></span>,
<span class="n"><span class="pre">handle</span></span><span
class="sig-paren">)</span><a class="headerlink" href="#c.IOEP_DETACH"
title="Permalink to this definition"></a><br /></dt>
+<dd><p>Detach and disable a previously attached callback referenced by <code
class="docutils literal notranslate"><span class="pre">handle</span></code>.</p>
+</dd></dl>
+
+<p>Note: when <code class="docutils literal notranslate"><span
class="pre">CONFIG_IOEXPANDER_NPINS</span></code> > 64, <code
class="docutils literal notranslate"><span
class="pre">ioe_pinset_t</span></code> represents a
+single interrupt pin number rather than a bitmask.</p>
+</section>
+<section id="driver-interface-lower-half">
+<h3>Driver interface (lower-half)<a class="headerlink"
href="#driver-interface-lower-half" title="Permalink to this heading"></a></h3>
+<p>Each IO expander driver must implement the operations table
+<code class="docutils literal notranslate"><span class="pre">struct</span>
<span class="pre">ioexpander_ops_s</span></code>. At minimum the driver should
provide:</p>
+<ul class="simple">
+<li><p><code class="docutils literal notranslate"><span
class="pre">ioe_direction</span></code></p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">ioe_option</span></code></p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">ioe_writepin</span></code></p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">ioe_readpin</span></code></p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">ioe_readbuf</span></code></p></li>
+</ul>
+<p>Optional multi-pin and interrupt attach/detach methods should be provided
+when the corresponding configuration options are enabled.</p>
+</section>
+<section id="binding-to-the-upper-layer-gpio-lower-half">
+<h3>Binding to the upper layer (gpio_lower_half)<a class="headerlink"
href="#binding-to-the-upper-layer-gpio-lower-half" title="Permalink to this
heading"></a></h3>
+<p>Applications normally do not access IO expander drivers directly. Typical
+binding steps are:</p>
+<ol class="arabic simple">
+<li><dl class="simple">
+<dt>Obtain the bus instance (for example, <code class="docutils literal
notranslate"><span class="pre">struct</span> <span
class="pre">i2c_master_s</span> <span class="pre">*</span></code>)
from</dt><dd><p>the hardware-specific bus driver.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Call the expander driver’s initialization routine with the bus
instance</dt><dd><p>and device configuration to obtain a <code class="docutils
literal notranslate"><span class="pre">struct</span> <span
class="pre">ioexpander_dev_s</span> <span class="pre">*</span></code>.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="simple">
+<dt>Use the returned <code class="docutils literal notranslate"><span
class="pre">ioe</span></code> instance directly, or register
individual</dt><dd><p>expander pins as standard GPIO devices via <code
class="docutils literal notranslate"><span
class="pre">gpio_lower_half</span></code> or
+<code class="docutils literal notranslate"><span
class="pre">gpio_lower_half_byname</span></code>.</p>
+</dd>
+</dl>
+</li>
+</ol>
+<p>Example (pseudocode):</p>
+<div class="highlight-none notranslate"><div
class="highlight"><pre><span></span>/* Get the I2C bus */
+struct i2c_master_s *i2c = up_i2cinitialize(0);
+
+/* Initialize the expander (driver-specific init) */
+struct ioexpander_dev_s *ioe = pca9555_initialize(i2c, CONFIG_PCA9555_ADDR);
+
+/* Configure pin 0 as input with pull-up and enable debounce */
+IOEXP_SETDIRECTION(ioe, 0, IOEXPANDER_DIRECTION_IN_PULLUP);
+IOEXP_SETOPTION(ioe, 0, IOEXPANDER_OPTION_SETDEBOUNCE,
+ (FAR void *)IOEXPANDER_DEBOUNCE_ENABLE);
+</pre></div>
+</div>
+</section>
+<section id="examples-and-references">
+<h3>Examples and references<a class="headerlink"
href="#examples-and-references" title="Permalink to this heading"></a></h3>
+<p>See the following drivers and board examples for concrete usage:</p>
+<ul class="simple">
+<li><p><code class="docutils literal notranslate"><span
class="pre">drivers/ioexpander/pca9555.c</span></code> — I2C IO expander
implementation.</p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">drivers/ioexpander/ioe_rpmsg.c</span></code> — RPMSG-based IO
expander.</p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">boards/arm/nrf52/thingy52/src/nrf52_sx1509.c</span></code> —
binding example.</p></li>
+</ul>
+</section>
+</section>
</section>
diff --git a/content/docs/latest/genindex.html
b/content/docs/latest/genindex.html
index 47da59947d..d9d5f9c651 100644
--- a/content/docs/latest/genindex.html
+++ b/content/docs/latest/genindex.html
@@ -595,7 +595,7 @@
</li>
</ul></td>
<td style="width: 33%; vertical-align: top;"><ul>
- <li><a href="reference/os/time_clock.html#c.hrtimer_cb">hrtimer_cb (C
type)</a>
+ <li><a
href="reference/os/time_clock.html#c.hrtimer_entry_t">hrtimer_entry_t (C
type)</a>
</li>
<li><a href="reference/os/time_clock.html#c.hrtimer_init">hrtimer_init
(C function)</a>
</li>
@@ -653,8 +653,6 @@
</li>
<li><a href="reference/os/iob.html#c.iob_dump">iob_dump (C function)</a>
</li>
- </ul></td>
- <td style="width: 33%; vertical-align: top;"><ul>
<li><a href="reference/os/iob.html#c.iob_free">iob_free (C function)</a>
</li>
<li><a href="reference/os/iob.html#c.iob_free_chain">iob_free_chain (C
function)</a>
@@ -663,6 +661,8 @@
</li>
<li><a
href="reference/os/iob.html#c.iob_free_queue_qentry">iob_free_queue_qentry (C
function)</a>
</li>
+ </ul></td>
+ <td style="width: 33%; vertical-align: top;"><ul>
<li><a
href="reference/os/iob.html#c.iob_get_queue_size">iob_get_queue_size (C
function)</a>
</li>
<li><a href="reference/os/iob.html#c.iob_initialize">iob_initialize (C
function)</a>
@@ -688,6 +688,20 @@
<li><a href="glossary.html#term-IOCTL"><strong>IOCTL</strong></a>
</li>
<li><a href="components/filesystem/index.html#c.ioctl">ioctl (C
function)</a>, <a href="reference/user/10_filesystem.html#c.ioctl">[1]</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEP_ATTACH">IOEP_ATTACH (C
macro)</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEP_DETACH">IOEP_DETACH (C
macro)</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEXP_READBUF">IOEXP_READBUF
(C macro)</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEXP_READPIN">IOEXP_READPIN
(C macro)</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEXP_SETDIRECTION">IOEXP_SETDIRECTION
(C macro)</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEXP_SETOPTION">IOEXP_SETOPTION
(C macro)</a>
+</li>
+ <li><a
href="components/drivers/special/ioexpander.html#c.IOEXP_WRITEPIN">IOEXP_WRITEPIN
(C macro)</a>
</li>
<li><a href="glossary.html#term-IoT"><strong>IoT</strong></a>
</li>
@@ -1086,11 +1100,11 @@
<li><a href="components/nxgraphics/nx.html#c.nx_kbdchin">nx_kbdchin (C
function)</a>
</li>
<li><a href="components/nxgraphics/nx.html#c.nx_kbdin">nx_kbdin (C
function)</a>
-</li>
- <li><a href="components/nxgraphics/nx.html#c.nx_lower">nx_lower (C
function)</a>
</li>
</ul></td>
<td style="width: 33%; vertical-align: top;"><ul>
+ <li><a href="components/nxgraphics/nx.html#c.nx_lower">nx_lower (C
function)</a>
+</li>
<li><a href="components/nxgraphics/nx.html#c.nx_modal">nx_modal (C
function)</a>
</li>
<li><a href="components/nxgraphics/nx.html#c.nx_mousein">nx_mousein (C
function)</a>
@@ -1270,8 +1284,6 @@
<li><a
href="reference/os/nuttx.html#c.nxsched_process_timer">nxsched_process_timer (C
function)</a>
</li>
<li><a href="reference/os/sleep.html#c.nxsched_sleep">nxsched_sleep (C
function)</a>
-</li>
- <li><a
href="reference/os/nuttx.html#c.nxsched_tick_expiration">nxsched_tick_expiration
(C function)</a>
</li>
<li><a
href="reference/os/sleep.html#c.nxsched_ticksleep">nxsched_ticksleep (C
function)</a>
</li>
@@ -2136,10 +2148,6 @@
<li><a href="reference/os/time_clock.html#c.wd_cancel">wd_cancel (C
function)</a>
</li>
<li><a href="reference/os/time_clock.html#c.wd_gettime">wd_gettime (C
function)</a>
-</li>
- <li><a href="reference/os/time_clock.html#c.wd_restart">wd_restart (C
function)</a>
-</li>
- <li><a
href="reference/os/time_clock.html#c.wd_restart_next">wd_restart_next (C
function)</a>
</li>
<li><a href="reference/os/time_clock.html#c.wd_start">wd_start (C
function)</a>
</li>
@@ -2149,10 +2157,10 @@
</li>
<li><a
href="components/drivers/character/timers/watchdog.html#c.WDIOC_CAPTURE">WDIOC_CAPTURE
(C macro)</a>
</li>
- </ul></td>
- <td style="width: 33%; vertical-align: top;"><ul>
<li><a
href="components/drivers/character/timers/watchdog.html#c.WDIOC_GETSTATUS">WDIOC_GETSTATUS
(C macro)</a>
</li>
+ </ul></td>
+ <td style="width: 33%; vertical-align: top;"><ul>
<li><a
href="components/drivers/character/timers/watchdog.html#c.WDIOC_KEEPALIVE">WDIOC_KEEPALIVE
(C macro)</a>
</li>
<li><a
href="components/drivers/character/timers/watchdog.html#c.WDIOC_SETTIMEOUT">WDIOC_SETTIMEOUT
(C macro)</a>
diff --git a/content/docs/latest/guides/fully_linked_elf.html
b/content/docs/latest/guides/fully_linked_elf.html
index 7b91b32530..8a870be192 100644
--- a/content/docs/latest/guides/fully_linked_elf.html
+++ b/content/docs/latest/guides/fully_linked_elf.html
@@ -482,7 +482,7 @@ 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="adfee87c-0960-4d45-aa46-40f4a2ec0826"
name="adfee87c-0960-4d45-aa46-40f4a2ec0826" type="checkbox"><label
class="sphinx_collapse__label" for="adfee87c-0960-4d45-aa46-40f4a2ec0826"><i
class="sphinx_collapse__icon"></i>Show content:</label><div
class="sphinx_collapse__content docutils">
+<input class="sphinx_collapse__input"
id="79b9ff92-53f3-4b1c-b796-61fe7ae12359"
name="79b9ff92-53f3-4b1c-b796-61fe7ae12359" type="checkbox"><label
class="sphinx_collapse__label" for="79b9ff92-53f3-4b1c-b796-61fe7ae12359"><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 215504f0ce..8959265987 100644
--- a/content/docs/latest/guides/partially_linked_elf.html
+++ b/content/docs/latest/guides/partially_linked_elf.html
@@ -508,7 +508,7 @@ 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="50df57df-e074-4295-8a2e-e286d337fe1e"
name="50df57df-e074-4295-8a2e-e286d337fe1e" type="checkbox"><label
class="sphinx_collapse__label" for="50df57df-e074-4295-8a2e-e286d337fe1e"><i
class="sphinx_collapse__icon"></i>Show content:</label><div
class="sphinx_collapse__content docutils">
+<input class="sphinx_collapse__input"
id="2e4458a3-ff35-47ea-9832-2b1505000edb"
name="2e4458a3-ff35-47ea-9832-2b1505000edb" type="checkbox"><label
class="sphinx_collapse__label" for="2e4458a3-ff35-47ea-9832-2b1505000edb"><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 f72ef61e21..275cf84c6b 100644
--- a/content/docs/latest/index.html
+++ b/content/docs/latest/index.html
@@ -191,7 +191,7 @@ 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: 13 January 26 at 00:33</p>
+<p>Last Updated: 14 January 26 at 00:34</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 b334592619..a1032d1eb5 100644
Binary files a/content/docs/latest/objects.inv and
b/content/docs/latest/objects.inv differ
diff --git a/content/docs/latest/reference/os/nuttx.html
b/content/docs/latest/reference/os/nuttx.html
index eef2b9fab0..b278e73331 100644
--- a/content/docs/latest/reference/os/nuttx.html
+++ b/content/docs/latest/reference/os/nuttx.html
@@ -224,17 +224,6 @@ periodically – the calling interval must be
<code class="docutils literal notranslate"><span
class="pre">CONFIG_USEC_PER_TICK</span></code>.</p>
</dd></dl>
-<dl class="c function">
-<dt class="sig sig-object c" id="c.nxsched_tick_expiration">
-<span class="kt"><span class="pre">void</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">nxsched_tick_expiration</span></span></span><span
class="sig-paren">(</span><span class="kt"><span
class="pre">void</span></span><span class="sig-paren">)</span><a
class="headerlink" href="#c.nxsched_tick_expiration" title="Permalink to this
definition"></a><br /></dt>
-<dd><p>Description: if <code class="docutils literal notranslate"><span
class="pre">CONFIG_SCHED_TICKLESS</span></code> is defined, then this
-function is provided by the RTOS base code and called from
-platform-specific code when the interval timer used to implemented
-the tick-less OS expires.</p>
-<p><strong>Assumptions</strong>: Base code implementation assumes that this
-function is called from interrupt handling logic with interrupts disabled.</p>
-</dd></dl>
-
<dl class="c function">
<dt class="sig sig-object c" id="c.irq_dispatch">
<span class="kt"><span class="pre">void</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">irq_dispatch</span></span></span><span
class="sig-paren">(</span><span class="kt"><span
class="pre">int</span></span><span class="w"> </span><span class="n"><span
class="pre">irq</span></span>, <span class="pre">FAR</span><span class="w">
</span><span class="kt"><span class="pre">void</span></span><span class="w">
</span><span class="p"><span clas [...]
diff --git a/content/docs/latest/reference/os/time_clock.html
b/content/docs/latest/reference/os/time_clock.html
index 21f5c8e053..00623555fc 100644
--- a/content/docs/latest/reference/os/time_clock.html
+++ b/content/docs/latest/reference/os/time_clock.html
@@ -562,7 +562,7 @@ and a free-running counter with the same timer!</p>
following interfaces for use by the platform-specific interval
timer implementation:</p>
<ul class="simple">
-<li><p><code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code>: called by the
platform-specific logic when the interval time expires.</p></li>
+<li><p><code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code>: called by the
platform-specific logic when the interval time expires.</p></li>
</ul>
<dl class="c function">
<dt class="sig sig-object c" id="c.archname_timer_initialize">
@@ -612,7 +612,7 @@ order to assure atomic register operations.</p>
<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">up_alarm_cancel</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="k"><span class="pre">struct</span></span><span class="w">
</span><a class="reference internal" href="../user/structures.html#c.timespec"
title="timespec"><span class="n"><span
class="pre">timespec</span></span></a><sp [...]
<dd><p>Cancel the alarm and return the time of cancellation of the alarm.
These two steps need to be as nearly atomic as possible.
-<code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code> will not be called unless
the alarm
+<code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code> will not be called unless the
alarm
is restarted with <code class="docutils literal notranslate"><span
class="pre">up_alarm_start()</span></code>. If, as a race condition,
the alarm has already expired when this function is called, then
time returned is the current time.</p>
@@ -636,7 +636,7 @@ internally to assure non-reentrancy.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.up_alarm_start">
<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">up_alarm_start</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="k"><span class="pre">const</span></span><span class="w">
</span><span class="k"><span class="pre">struct</span></span><span class="w">
</span><a class="reference internal" href="../user/structures.html#c.timespec"
titl [...]
-<dd><p>Start the alarm. <code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code> will be called
+<dd><p>Start the alarm. <code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code> will be called
when the alarm occurs (unless <code class="docutils literal notranslate"><span
class="pre">up_alarm_cancel</span></code> is called to
stop it).</p>
<dl class="field-list simple">
@@ -644,7 +644,7 @@ stop it).</p>
<dd class="field-odd"><ul class="simple">
<li><p><strong>ts</strong> – The time in the future at the alarm is expected to
occur. When the alarm occurs the timer logic will call
-<code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code>.</p></li>
+<code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code>.</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
@@ -663,11 +663,11 @@ disabled internally to assure non-reentrancy.</p>
<p>Cancel the interval timer and return the time remaining on the
timer. These two steps need to be as nearly atomic as possible.
-<code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code> will not be called unless
the timer
+<code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code> will not be called unless the
timer
is restarted with <code class="docutils literal notranslate"><span
class="pre">up_timer_start()</span></code>. If, as a race condition,
the timer has already expired when this function is called, then
that pending interrupt must be cleared so that
-<code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code> is not called spuriously
and the
+<code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code> is not called spuriously and
the
remaining time of zero should be returned.</p>
<dl class="field-list simple">
<dt class="field-odd">param ts<span class="colon">:</span></dt>
@@ -686,13 +686,13 @@ disabled internally to assure non-reentrancy.</p>
<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">up_timer_start</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="k"><span class="pre">const</span></span><span class="w">
</span><span class="k"><span class="pre">struct</span></span><span class="w">
</span><a class="reference internal" href="../user/structures.html#c.timespec"
titl [...]
<dd></dd></dl>
-<p>Start the interval timer. <code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code> will be
+<p>Start the interval timer. <code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code> will be
called at the completion of the timeout (unless
<code class="docutils literal notranslate"><span
class="pre">up_timer_cancel()</span></code> is called to stop the timing).</p>
<dl class="field-list simple">
<dt class="field-odd">param ts<span class="colon">:</span></dt>
<dd class="field-odd"><p>Provides the time interval until
-<code class="docutils literal notranslate"><span
class="pre">nxsched_tick_expiration()</span></code> is called.</p>
+<code class="docutils literal notranslate"><span
class="pre">nxsched_process_timer()</span></code> is called.</p>
</dd>
<dt class="field-even">return<span class="colon">:</span></dt>
<dd class="field-even"><p>Zero (OK) on success; a negated errno value on
failure.</p>
@@ -716,8 +716,8 @@ or <code class="docutils literal notranslate"><span
class="pre">kill()</span></c
<ul class="simple">
<li><p><a class="reference internal" href="#c.wd_start" title="wd_start"><code
class="xref c c-func docutils literal notranslate"><span
class="pre">wd_start()</span></code></a></p></li>
<li><p><a class="reference internal" href="#c.wd_start_next"
title="wd_start_next"><code class="xref c c-func docutils literal
notranslate"><span class="pre">wd_start_next()</span></code></a></p></li>
-<li><p><a class="reference internal" href="#c.wd_restart"
title="wd_restart"><code class="xref c c-func docutils literal
notranslate"><span class="pre">wd_restart()</span></code></a></p></li>
-<li><p><a class="reference internal" href="#c.wd_restart_next"
title="wd_restart_next"><code class="xref c c-func docutils literal
notranslate"><span class="pre">wd_restart_next()</span></code></a></p></li>
+<li><p><code class="xref c c-func docutils literal notranslate"><span
class="pre">wd_restart()</span></code></p></li>
+<li><p><code class="xref c c-func docutils literal notranslate"><span
class="pre">wd_restart_next()</span></code></p></li>
<li><p><a class="reference internal" href="#c.wd_cancel"
title="wd_cancel"><code class="xref c c-func docutils literal
notranslate"><span class="pre">wd_cancel()</span></code></a></p></li>
<li><p><a class="reference internal" href="#c.wd_gettime"
title="wd_gettime"><code class="xref c c-func docutils literal
notranslate"><span class="pre">wd_gettime()</span></code></a></p></li>
<li><p>Watchdog Timer Callback</p></li>
@@ -801,58 +801,6 @@ context of the timer interrupt handler and is subject to
all ISR
restrictions.</p>
</dd></dl>
-<dl class="c function">
-<dt class="sig sig-object c" id="c.wd_restart">
-<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">wd_restart</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="k"><span class="pre">struct</span></span><span class="w">
</span><span class="n"><span class="pre">wdog_s</span></span><span class="w">
</span><span class="p"><span class="pre">*</span></span><span class="n"><span
class="p [...]
-<dd><p>This function restarts the specified watchdog timer using the same
-function and argument that were specified in the previous wd_start()
-call, but with a new delay value. It can be used when the user wants
-to restart the same watchdog with a different timeout value, or to
-refresh (feed) an existing watchdog before it expires.</p>
-<dl class="field-list simple">
-<dt class="field-odd">Parameters<span class="colon">:</span></dt>
-<dd class="field-odd"><ul class="simple">
-<li><p><strong>wdog</strong> – Pointer to the watchdog timer to
restart</p></li>
-<li><p><strong>delay</strong> – Delay count in clock ticks</p></li>
-</ul>
-</dd>
-</dl>
-<p><strong>NOTE</strong>: The parameter must be of type <code class="docutils
literal notranslate"><span class="pre">wdparm_t</span></code>.</p>
-<dl class="field-list simple">
-<dt class="field-odd">Returns<span class="colon">:</span></dt>
-<dd class="field-odd"><p>Zero (<code class="docutils literal
notranslate"><span class="pre">OK</span></code>) is returned on success; a
negated <code class="docutils literal notranslate"><span
class="pre">errno</span></code> value
-is return to indicate the nature of any failure.</p>
-</dd>
-</dl>
-</dd></dl>
-
-<dl class="c function">
-<dt class="sig sig-object c" id="c.wd_restart_next">
-<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">wd_restart_next</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="k"><span class="pre">struct</span></span><span class="w">
</span><span class="n"><span class="pre">wdog_s</span></span><span class="w">
</span><span class="p"><span class="pre">*</span></span><span class="n"><span
cla [...]
-<dd><p>This function restarts the specified watchdog timer using a new delay
-value, but schedules the next expiration based on the previous
-expiration time (wdog->expired + delay). This allows the watchdog to
-maintain a consistent periodic interval even if there is some delay in
-handling the expiration callback.</p>
-<p>It can be used when the user wants to restart a watchdog for a different
-purpose or continue periodic timing based on the previous timeout point.</p>
-<dl class="field-list simple">
-<dt class="field-odd">Parameters<span class="colon">:</span></dt>
-<dd class="field-odd"><ul class="simple">
-<li><p><strong>wdog</strong> – Pointer to the watchdog timer to
restart</p></li>
-<li><p><strong>delay</strong> – Delay count in clock ticks</p></li>
-</ul>
-</dd>
-</dl>
-<p><strong>NOTE</strong>: The parameter must be of type <code class="docutils
literal notranslate"><span class="pre">wdparm_t</span></code>.</p>
-<dl class="field-list simple">
-<dt class="field-odd">Returns<span class="colon">:</span></dt>
-<dd class="field-odd"><p>Zero (<code class="docutils literal
notranslate"><span class="pre">OK</span></code>) is returned on success; a
negated <code class="docutils literal notranslate"><span
class="pre">errno</span></code> value
-is return to indicate the nature of any failure.</p>
-</dd>
-</dl>
-</dd></dl>
-
<dl class="c function">
<dt class="sig sig-object c" id="c.wd_cancel">
<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">wd_cancel</span></span></span><span class="sig-paren">(</span><span
class="pre">FAR</span><span class="w"> </span><span class="k"><span
class="pre">struct</span></span><span class="w"> </span><span class="n"><span
class="pre">wdog_s</span></span><span class="w"> </span><span class="p"><span
class="pre">*</span></span><span class="n"><span class="pr [...]
@@ -1024,12 +972,13 @@ transitioned to HRTIMER_STATE_INACTIVE.</p>
<dl class="c function">
<dt class="sig sig-object c" id="c.hrtimer_start">
-<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">hrtimer_start</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="n"><span class="pre">hrtimer_t</span></span><span
class="w"> </span><span class="p"><span class="pre">*</span></span><span
class="n"><span class="pre">hrtimer</span></span>, <span class="n"><span
class="pre">uint64_t</s [...]
+<span class="kt"><span class="pre">int</span></span><span class="w">
</span><span class="sig-name descname"><span class="n"><span
class="pre">hrtimer_start</span></span></span><span
class="sig-paren">(</span><span class="pre">FAR</span><span class="w">
</span><span class="n"><span class="pre">hrtimer_t</span></span><span
class="w"> </span><span class="p"><span class="pre">*</span></span><span
class="n"><span class="pre">hrtimer</span></span>, <a class="reference
internal" href="#c.hrtime [...]
<dd><p>This function starts a high-resolution timer in absolute or relative
mode.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>hrtimer</strong> – Timer instance to cancel</p></li>
+<li><p><strong>func</strong> – Expiration callback function</p></li>
<li><p><strong>ns</strong> – Timer expiration in nanoseconds (absolute or
relative)</p></li>
<li><p><strong>mode</strong> – HRTIMER_MODE_ABS or HRTIMER_MODE_REL</p></li>
</ul>
@@ -1042,8 +991,8 @@ transitioned to HRTIMER_STATE_INACTIVE.</p>
</dd></dl>
<dl class="c type">
-<dt class="sig sig-object c" id="c.hrtimer_cb">
-<span class="k"><span class="pre">typedef</span></span><span class="w">
</span><span class="n"><span class="pre">uint64_t</span></span><span class="w">
</span><span class="p"><span class="pre">(</span></span><span class="p"><span
class="pre">*</span></span><span class="sig-name descname"><span
class="n"><span class="pre">hrtimer_cb</span></span></span><span
class="p"><span class="pre">)</span></span><span class="p"><span
class="pre">(</span></span><span class="pre">FAR</span><span class= [...]
+<dt class="sig sig-object c" id="c.hrtimer_entry_t">
+<span class="k"><span class="pre">typedef</span></span><span class="w">
</span><span class="n"><span class="pre">uint64_t</span></span><span class="w">
</span><span class="p"><span class="pre">(</span></span><span class="p"><span
class="pre">*</span></span><span class="sig-name descname"><span
class="n"><span class="pre">hrtimer_entry_t</span></span></span><span
class="p"><span class="pre">)</span></span><span class="p"><span
class="pre">(</span></span><span class="pre">FAR</span><span c [...]
<dd><p><strong>High-resolution Timer Callback</strong>: when a hrtimer expires,
the callback function with this type is called.</p>
</dd></dl>
diff --git a/content/docs/latest/searchindex.js
b/content/docs/latest/searchindex.js
index 59d2e41aec..49edc4f6dc 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/arch-risc-v",
"_tags/arch-riscv", "_tags/arch-sim", "_tags/chip-a527", "_tags/chip-a64",
"_tags/chip-at32uc3", "_tags/chip-at90usb", "_tags/chip-atmega",
"_tags/chip-atmega128", "_tags/chip-atmega1284p", "_tags/chip-atmega2560",
"_tags/chip-bcm2711", "_tags/chip-esp32", "_tags/chip-esp32-c3",
"_tags/chip-esp32a1s", "_tags/chip-esp32picod4", "_tags/chip-esp32s2", "_tags/c
[...]
\ No newline at end of file
+Search.setIndex({"docnames": ["_tags/arch-arm64", "_tags/arch-avr",
"_tags/arch-example", "_tags/arch-renesas", "_tags/arch-risc-v",
"_tags/arch-riscv", "_tags/arch-sim", "_tags/chip-a527", "_tags/chip-a64",
"_tags/chip-at32uc3", "_tags/chip-at90usb", "_tags/chip-atmega",
"_tags/chip-atmega128", "_tags/chip-atmega1284p", "_tags/chip-atmega2560",
"_tags/chip-bcm2711", "_tags/chip-esp32", "_tags/chip-esp32-c3",
"_tags/chip-esp32a1s", "_tags/chip-esp32picod4", "_tags/chip-esp32s2", "_tags/c
[...]
\ No newline at end of file
diff --git a/content/feed.xml b/content/feed.xml
index a014fb13b6..6a87e18f2b 100644
--- a/content/feed.xml
+++ b/content/feed.xml
@@ -5,8 +5,8 @@
<description></description>
<link>/</link>
<atom:link href="/feed.xml" rel="self" type="application/rss+xml"/>
- <pubDate>Tue, 13 Jan 2026 00:36:13 +0000</pubDate>
- <lastBuildDate>Tue, 13 Jan 2026 00:36:13 +0000</lastBuildDate>
+ <pubDate>Wed, 14 Jan 2026 00:37:16 +0000</pubDate>
+ <lastBuildDate>Wed, 14 Jan 2026 00:37:16 +0000</lastBuildDate>
<generator>Jekyll v4.4.1</generator>
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