Arduino for STM32

Posted: **Mon Jun 03, 2024 12:44 pm**

I started playing with some WeAct CH32X035 boards and came across wagiminator / MCU-Flash-Tools which contains Python flash scripts for various MCUs including stm32isp

I want to add support for the chprog flash tool to arduino_core_ch32. For testing purposes, I have done the following:

1. Download and copy chprog.py to: `/Users/ZZZ/Library/Arduino15/packages/WCH/tools/openocd/1.0.0/bin`
2. Add the following to platform.txt:

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    ## CHPROG
    tools.CHPROG.path={runtime.tools.openocd-1.0.0.path}/bin/
    tools.CHPROG.cmd=chprog.py
    tools.CHPROG.upload.params.verbose=
    tools.CHPROG.upload.params.quiet=
    tools.CHPROG.upload.pattern=python3 "{path}{cmd}" "{build.path}/{build.project_name}.bin"

3. Add the following to boards.txt:

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    CH32X035_EVT.menu.upload_method.chprogMethod=Wagiminator chprog
    CH32X035_EVT.menu.upload_method.chprogMethod.upload.protocol=chprog
    CH32X035_EVT.menu.upload_method.chprogMethod.upload.options=
    CH32X035_EVT.menu.upload_method.chprogMethod.upload.tool=CHPROG

I then select Wagiminator chprog as the upload method and hit upload. The correct upload command is generated:

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python3 /Users/ZZZ/Library/Arduino15/packages/WCH/tools/openocd/1.0.0/bin/chprog.py /var/folders/tq/dqrghm993td49tz1pvg8psxm0000gn/T/arduino_build_807950/Blink.ino.bin

But the command fails with:

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Traceback (most recent call last):
  File "/Users/ZZZ/Library/Arduino15/packages/WCH/tools/openocd/1.0.0/bin/chprog.py", line 45, in <module>
    import usb.core
ModuleNotFoundError: No module named 'usb'

When I run the generated upload command from the command line, it works as expected, thus it seems as if my environment is set up correctly.

Running which python3 gives:

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/Library/Frameworks/Python.framework/Versions/3.12/bin/python3

From Arduino, the following version of python3 is executed:

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/Applications/Xcode.app/Contents/Developer/usr/bin/python3

I hardcoded the path to the non-xcode python3 executable in platform.txt with the same error described above. I do not know enough about the python environment to fix this.

I downloaded pyinstaller and bundle chprog.py to a "One File" executable using:

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pyinstaller --onefile chprog.py

I then modified platform.txt to reference this executable, and it is working as expected.

I was hoping someone can help me understand what I need to do to get the original chprog.py python script working

My setup:

macOS Sonoma 14.5 M1
arduino_core_ch32 1.0.4
Arduino 1.8.19

Arduino for STM32

How to invoke a python upload script correctly?

How to invoke a python upload script correctly?