SPI to SSP

Hi there. I am working through the SPI example and have found that port 0 works great, but when I switch the port to 1 (on the same pins), the SSP doesn't seem to be working. Is there anything else I need to account for while using the SSP ports instead of the SPI within your SDK? 

Thanks!

Hi Drew,

There is nothing special within the SPI driver to use the other SSP ports (number 1 and 2). You do need to change the pin configuration for the SCK, MISO and MOSI pins within the PINSEL registers. This is can be done using PIN_SetFunction() from mcu_pin.c/.h. 

For example, assuming you're using P0.15, P0.17 and P0.18, you should have the following somewhere in your application.

// Configure pins for SPI peripheral
PIN_SetFunction(P0_15, 3); // SCK pin
PIN_SetFunction(P0_17, 3); // MISO pin
PIN_SetFunction(P0_18, 3); // MOSI pin​

The following is changed to configure the same pins for the SSP0 peripheral instead.

// Configure pins for SSP0 peripheral
PIN_SetFunction(P0_15, 2); // SCK pin
PIN_SetFunction(P0_17, 2); // MISO pin
PIN_SetFunction(P0_18, 2); // MOSI pin

Best Regards,

Tyler

That was my problem.

Thank you very much for the support.