[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
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-- Commit Summary --
* stm32/periph/spi : Add check for GPIO_UNDEF
-- File Changes --
M cpu/stm32/periph/spi.c (20)
-- Patch Links --
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