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

benpicco notifications at github.com
Thu Jul 8 13:04:50 CEST 2021

@benpicco commented on this pull request.

> @@ -134,12 +134,20 @@ void spi_init_pins(spi_t bus)
     gpio_init_af(spi_config[bus].mosi_pin, GPIO_AF_OUT_PP);
     gpio_init(spi_config[bus].miso_pin, GPIO_IN);

you should also update the `CPU_FAM_STM32F1` case 

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