Need three SPI master interfaces

[Steven Grunza]

I am trying to use the sdk_config.h file from SDK15 to setup a custom board with a nRF52832.  The nRF5283 connects to three SPI peripherals.  For ease of software development the three SPI peripherals are all in slave mode, the nRF52 is master of all of them.

How do I assign pins in the sdk_config.h file? 

I have the feeling I am missing some important piece of documentation.  The only documentation I have found is the datasheet for the nRF52831 and the documentation directory of the SDK.

[Martin Lesund]

Hi Steven,

You can have one master and several slave. Just have to use the SS (Slave Select) pins to control which one should be active. (see figure)

You can use any GPIO pin as MOSI, MISO etc.

SPI Master documentation

> Use the SPI Master Example as reference.

[Steven Grunza]

Using a single SPI controller will prevent the DMA from moving data from the two slaves simultaneously.  My hope is that while the nRF52832 CPU is busy handling BLE protocol the DMA will be moving data from the two slaves with the DMA's arbitrating between themselves to get to the data RAM. 

Since the board has already been designed and built, it now needs to be three separate SPI controllers.