PSEL.MOSI How to select MOSI pins? Need clarification.

[polishdude20]

I'm looking at the datasheet for the NRF52832 because I'll be using it with a Raytac module and I'd like to know for sure how the SPI pins are set.

I see in the datasheet there are registers such as PSEL.MOSI, PSEL.MISO etc and these registers are 32 bits. From looking at the datasheet, it is my understanding that the bit number that is a high bit is the one that corresponds to the pin selected? For example, if I want MOSI on P0.12, I'd set bit 12 to HIGH and all others to LOW ?

Thanks for the help!

[hmolesworth]

Like this:

PSEL.MOSI = 12;

There is a macro for decoding port pins on parts with P0, P1 etc but for the nRF52832 the above is simpler.

[polishdude20]

Ah so in the programming environment if you set PSEL.MOSI = 12 like that it will automatically know what it is? Or is that in some config files somewhere?

[hmolesworth]

Ah, there are two options, use the Nordic library drivers which have examples there is a config call for each peripheral, or you can use low-level drivers which is what I showed

[polishdude20]

Ok thanks!

[hmolesworth]

Quick sample of low-level and Nordic driver:

NRF_SPIM0->PSEL.MOSI = 12;

nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
spi_config.mosi_pin = 12; // SPI_MOSI_PIN;