ValueError: SPI(0) doesn't exist on Nucleo F767ZI

[luca827]

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Port, board and/or hardware

Nucleo F767ZI

MicroPython version

MicroPython v1.22.2

Reproduction

from machine import SPI

spi = SPI(0, sck='D13', miso='D12', mosi='D11')

Expected behaviour

No response

Observed behaviour

Traceback (most recent call last):
File "", line 3, in
ValueError: SPI(0) doesn't exist

Additional Information

No, I've provided everything above.

[dpgeorge]

SPI indices start at 1 on STM32 boards. There is no SPI(0).

[luca827]

Hello,
i also tryed SPI(1), SPI(2), SPI(3) and SPI(4). Only SPI(3) is working. SPI(1), SPI(2) and SPI(4) raise the ValueError: SPI(x) doesn't exist. Is this behavior expected? Where can I find the documentation which indices should work?

But thanks for your help, I only tried SPI 0-2 before. Your recommendation encouraged me to try SPI(3), which seems to worked.

[andrewleech]

Check the pins your specifying are correct for the SPI channel you're trying to use, stm chips generally only have 1 or 2 pins that can work for each SPI channel.

[dpgeorge]

Where can I find the documentation which indices should work?

Each board has a configuration that specifies which UART/SPI/etc are defined. For the Nucleo F767ZI see here: https://github.com/micropython/micropython/blob/master/ports/stm32/boards/NUCLEO_F767ZI/mpconfigboard.h#L52-L56

Only SPI(3) is defined, on pins PB3, PB4, PB5.

[andrewleech]

You should be able to use the other SPI channels too by specifying the pins in the unit call like on your original example.

The supported pins for each peripheral on this chip can be found in https://github.com/micropython/micropython/blob/master/ports/stm32/boards/stm32f767_af.csv