A couple of us have ported micropython to the STM32L462 and overall it's working. We've hacked together a fix to allow micropython to work on CPUs with the non-OTG USB found on the smaller ST parts as well as this one.
https://github.com/oskirby/micropython
I'm having a bit of trouble with the CDC part and am looking for any help in case it's something obvious.
Right now opening up the interface in putty I receive what ever's in the buffer, so error messages and the output from the last command run, etc. Typing stuff in I get no echo back. On pressing enter micropython does run what ever I've typed though it's hard to know for sure as I don't get any text back. If I close off the shell and open a connection again I get what's in the buffer.
I don't quite follow how the CDC interface works - it looks like there's a UART being used under the hood and it's somehow copied into the USB interface; I'm guessing this isn't happening correctly.
Any help would be greatly appreciated
STM32L462 Port
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Re: STM32L462 Port
Found the issue... Around line 167 of usbd_cdc_interface.c we wrote the check if the TX buffer is in use incorrectly. Commenting that section out makes things work but I bet it's not ideal.
I'm guessing experience with the USB (non-OTG) peripheral is lacking here as it's not supported yet, but if anyone has any suggestions on how to implement that check, let me know. Thanks.
I'm guessing experience with the USB (non-OTG) peripheral is lacking here as it's not supported yet, but if anyone has any suggestions on how to implement that check, let me know. Thanks.