[riot-notifications] [RIOT-OS/RIOT] stm32/spi : Add check for GPIO_UNDEF (#16625)

Akshai M (Augustus Diode) notifications at github.com
Wed Jul 7 17:35:45 CEST 2021


### Contribution description

This PR address issue first discovered in #16579 .  STM32WL55JC use a memory mapped SPI interface instead of a GPIO. The change would init the `pins` only if it's not `GPIO_UNDEF`

### Testing procedure

Tested using #16579. Works!

### Issues/PRs references

#16579
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/16625

-- Commit Summary --

  * stm32/periph/spi : Add check for GPIO_UNDEF

-- File Changes --

    M cpu/stm32/periph/spi.c (20)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/16625.patch
https://github.com/RIOT-OS/RIOT/pull/16625.diff

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https://github.com/RIOT-OS/RIOT/pull/16625
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