RE: nRF52840 as SPI slave

bojan — Tue, 08 Dec 2020 12:53:25 GMT

I found the issue, guys.

The problem was in the way I defined GPIOs for SPI connection. I initially did it through #define pre-processor directives:

#define SPIS_CS_PIN     31 // P0.31
#define SPIS_MISO_PIN   30 // P0.30
#define SPIS_MOSI_PIN   29 // P0.29
#define SPIS_SCK_PIN    28 // P0.28

However, this was not enough. It was needed to explicitly cast to uint_32t:

#define SPIS_CS_PIN     ((uint32_t)31) // P0.31
#define SPIS_MISO_PIN   ((uint32_t)30) // P0.30
#define SPIS_MOSI_PIN   ((uint32_t)29) // P0.29
#define SPIS_SCK_PIN    ((uint32_t)28) // P0.28

I'm sharing this experience with the hope to save somebody's time in the future.

Cheers!

Bojan.