implement 2 hardware SPI

Question

i want to implement 2 hardware SPI communication in my code. i have one already working. talking with LCD ILI9341. the functions are using spi_write / nrf_drv_spi_transfer for a single interface. what do i need to do to add another (4 pin) SPI interface to communicate with accelerometer. do i need to change it to SPI1 and then duplicate everything to SPI2 ? 
 
 thanks 
 Yuval

hmolesworth · Answer

If you are using standard Nordic libraries and so on then you just need to use a new instance and duplicate the code. ie if you are doing something like this: 
 APP_ERROR_CHECK(nrf_drv_spi_init(&mAccSpiInstance, &spi_config, acc_spi_event_handler, NULL));
 
 Then all you need to do is duplicate the code - typically in a separate c module - and use a new instance thus: 
 #define SPI_INSTANCE 1 // SPI instance index for 2nd SPI
static const nrf_drv_spi_t mAccSpiInstance = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);
 
 Ensure SPI1 is also enabled in sdk_config.h, of course, assuming you use SPI0 and SPI1. 
 As an aside, I recommend your choice of hardware implementation as a physically separate SPI interconnect if you want the best analogue performance as any noise on the SPI lines - when updating the display, for instance - will inject some noise into the accelerometer unless you synchronously run the display interface outside of times when the accelerometer (or other SPI ADC or AFE) is being clocked

implement 2 hardware SPI

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