nRF52 GPIO

[nghia]

Hi guy,

I am new to nRF52, I read some example code and I see this:

#define SPI1_CONFIG_SCK_PIN              2
#define SPI1_CONFIG_MOSI_PIN            30
#define SPI1_CONFIG_MISO_PIN             4
#define SPI1_CONFIG_IRQ_PRIORITY    6
#define SPI1_CONFIG_CS_PIN                 3

I can't find in any document that why these pin could be assigned to SPI pin function. Does anyone know what document mention it?

Thanks a lot!

[bjorn-spockeli]

Hi nghia, 

the NRF52 Family has a pin crossbar, which means that all the serial and digital interfaces, i.e. UART, SPI, TWI, PWM, I2S, PDM etc can be routed to any of the Digital GPIOs. Please see the PSEL register for the individual peripheral for the allowed pin range. 

Best regards

Bjørn

[awneil]

nghia said:

what document mention it?

The Product Specification.

eg, for nRF52832: 

https://infocenter.nordicsemi.com/topic/struct_nrf52/struct/nrf52832_ps.html

specifically:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/spim.html?cp=3_1_0_30_4#concept_v4x_5w2_wr