STM32H7B3I_DK board: HOWTO build micropython

[luccons]

Hi all,

I've followed your guide in order to build and install micropython binary firmware for STM32H7B3I_DK board but it seems I miss some steps.
Could you recap all the necessary steps to complete the build for this board?

Many thanks and best regards,

Francesco

[davefes]

Do you get errors during the build process, errors uploading the firmware or ??

[luccons]

Hi Dave,

I don't get errors during build process and I suppose that upload process about firmware has been successfully completed, I say that because I've installed your binary firmware (released on micropython website) and it works.

[davefes]

I have recently been using the build process here:
https://github.com/nspsck/STM32F411CEU6_BlackPill_Micropython/tree/main
maybe that helps.

Is your firmware .hex file similar in size to the Micropython .hex file?

[luccons]

I've followed your guide but my firmware.hex size is lower than Micropython one. What should I enable further during build process?

[davefes]

I find they are slightly different, guess it depends on the machine you are building on. Post a link to the specific guide you are using.

Maybe someone who has experience on this board would be helpful.

[luccons]

At first I've installed in my host pc (featured with Ubuntu 22.04 LTS) the arm toolchain:
sudo apt-get -y install gcc-arm-none-eabi build-essential

Later I've downloaded micropython source code and switched to branch v1.22.2:
git clone https://github.com/micropython/micropython.git
cd micrpython
git checkout 'v1.22.2'
git submodule update --init --recursive

Build mpy-cross:
cd mpy-cross
make -j
Build firmware for board STM32H7B3I_DK and write it on internal flash storage:
cd ../ports/stm32
make -j BOARD=STM32H7B3I_DK
st-flash erase
st-flash --format ihex write build-STM32H7B3I_DK/firmware.hex

[davefes]

@luccons The only other things I can suggest:

Do a make clean BOARD=STM32H7B31_DK after your cd ../ports/stm32

I use STM32Cube Programmer to do the erase and upload.

Sorry, don't think I can help further.

[IHOXOHI]

Hi,
Do you have tried to use the firmware from micropython download page, with just the cube programmer software?
I have mine which works, but without the display...
I tried to find a lib for that, without success...

[luccons]

Hi,
below you can find a valid micropython build procedure for board STM32H7B31_DK:

cd ports/mboot
make -C mboot BOARD=STM32H7B3I_DK
cd ..
BUILDING_MBOOT=1 make BOARD=STM32H7B3I_DK
st-flash erase
st-flash --format ihex write build-STM32H7B3I_DK/firmware.hex