Sparkfun Micromod STM32 - Add additional UART

[SYNiMAK]

I am looking to modify the SPARKFUN_MICROMOD_STM32 port of micropython to add a second uart on pins PB6 and PB7.

I have modified mpconfigboard.h and pins.csv but I am obviously missing something because when I compile and load the firmware I get a value error for "UART(2)"

This is what I added to mpconfigboard.h...

// UART2 config (MicroMod UART2)
#define MICROPY_HW_UART2_NAME "UART2"
#define MICROPY_HW_UART2_TX (pin_B6)
#define MICROPY_HW_UART2_RX (pin_B7)

and this to pins.csv...

UART_TX2, PB6
UART_RX2, PB7

I have compiled with these commands...

cd micropython/ports/stm32
make BOARD=SPARKFUN_MICROMOD_STM32 submodules
make BOARD=SPARKFUN_MICROMOD_STM32

What else do I have to change to get this to work?

Any help greatly appreciated!

[davefes]

Maybe start with:
make BOARD=SPARKFUN_MICROMOD_STM32 clean

[SYNiMAK]

Yeah tried a clean. Didn't make any difference.

But I did find pins_SPARKFUN_MICROMOD_STM32.c which is generated by make-pins.py. That seems to have the answers I am looking for. Giving it a go today.

[davefes]

Ok, when I enabled a 2nd UART on a STM32F411 I did not change any pins.csv.

[SYNiMAK]

I have UART1, UART3 and UART6 working.

Looking through 'pins_SPARKFUN_MICROMOD_STM32.c' gave me the pins that the different uart ports work on.

Modified 'pins_SPARKFUN_MICROMOD_STM32.c' and 'pins.csv' and it works.

[davefes]

Could you point to a guide that describes how to make these changes properly?

[SYNiMAK]

@davefes I didn't really follow any guide. There is probable a much better way to do it from my hack it together way but the general steps were...

View the pins_SPARKFUN_MICROMOD_STM32.c file and work out which pins can be used with which UART ports.
This may require a compile first to generate the file.

Modify pins.csv and mpconfigboard.h to reflect the changes in pins that you want to make

Compile and test

[davefes]

In micropython/ports.stm32/SPARKFUN_MICROMOD_STM32 I see a pins.csv, which seems more descriptive than the pins.csv I have seen so far ... which isn't many!

Where is the file pins_SPARKFUN_MICROMOD_STM32.c ??

I have been trying to put Micropython on a E77-400M22S. I think I managed to get a 2nd UART working, but can't sure.

Thanks,
Dave