That's sweet! I am updating an existing design from
ESP32-WROOM-32U-N4/platformio to ESP32-S3-WROOM-1U-N16/nuttx
so I got this new S3 board -
https://www.mouser.com/ProductDetail/356-ESP32S3DEVKTM1N8
I will have to try it out! Thank you!
On Fri, Dec 9, 2022 at 6:17 AM Sebastien Lorquet
wrote:
Hi Petro,
I checked the Errata:
https://ww1.microchip.com/downloads/en/DeviceDoc/SAM-E70-S70-V70-V71-Family-Errata-DS8767J.pdf
There is the ARM note:
3. Arm® Cortex®-M73.1 Arm Cortex-M7All issues related to the Arm r0p1 (for
MRLA) and r1p1 (and MRLB)
cores are described on the Arm website.
W
Thanks Petro,
You are right, or so it seems, but from what I can tell most of this is
working already
and since the armv7-m code is common across STM32 as well that should be ok.
But I did tst and try what you said, it is an easy change because we are in
thumb mode and
the SAMBA bootloader initia
> Have you ensured that all the code (and support code, systic etc) is in
RAM?
Primarily yes, besides the general setting breakpoints and seeing stuff end
up in ram, that is all good.
I also did some deep dive analysis before and after using GDB memory dumps
and objdump ..
Disassemble nuttx from
(Note that I did write "use" not port :p)
I got it working very fast by reading all the provided docs! This was
very well made this time, the level of support for this chip is very pro.
I could even recompile the required second stage bootloader from source.
It's fun that this bootloader requ
Hi Sebastien,
On 12/9/22, Sebastien Lorquet wrote:
> Hi,
>
> As an introduction to the RISCV, I would like to use NuttX on my M5stamp
> C3U, which I can get for 8 dollars at a local store.
>
> https://docs.m5stack.com/en/core/stamp_c3u
>
This M5stamp C3U uses that ESP32-C3 that is already comple
Hi,
OK I got the bootloading part figured out (eg, it shoud work because the
esp32c3 has a serial bootloader mode in ROM that should support usb CDC,
and I see a serial port by pushing the GPIO9 button while plugging it
in), I will try to use my board as a esp32c3 devkit for now, it shoud be
In order to have the possibility to reprogram the whole internal flash you
will need to implement CONFIG_BOOT_COPYTORAM option in sam_start.c and
create a proper linker script.
Maybe even you will need to move the __start routine to the assembly file
because after copying code to RAM you will need
Hi,
As an introduction to the RISCV, I would like to use NuttX on my M5stamp
C3U, which I can get for 8 dollars at a local store.
https://docs.m5stack.com/en/core/stamp_c3u
The module does not use a usb serial chip but direct USB connection
(there is a schematic in the bottom of the page).
Hi,
Finally I was able to take a look here. The case is that armv7-m (and some
other ARM versions) do not use arm_head.S and __start entry points are
implemented in C code and CONFIG_BOOT_COPYTORAM option is not implemented,
so code is always executed from internal flash. So when you are trying to
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