SPI configuration?

[venkatesha kj]

when i try to configure spi1 i am getting error, so how can i configure different spi ? 

[Einar Thorsrud]

To use blocking mode you do not provide a event handler when you initialize the driver using nrf_drv_spi_init(). So in your code, you would change the call to nrf_drv_spi_init() like this:

    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, NULL, NULL));

Then call nrf_drv_spi_transfer() like before (but fix it so that you check return values!) and the function will not return until the transaction has completed.

[venkatesha kj]

what are the functions i am suppose to enable in sdk_config file ?

and i need sdk_config file 

[Einar Thorsrud]

Please refer to example I linked to before to see an example of sdk_config.h when using SPI. The relevant section (copy-pasted from the example) is this:

// <e> SPI_ENABLED - nrf_drv_spi - SPI/SPIM peripheral driver - legacy layer
//==========================================================
#ifndef SPI_ENABLED
#define SPI_ENABLED 1
#endif
// <o> SPI_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef SPI_DEFAULT_CONFIG_IRQ_PRIORITY
#define SPI_DEFAULT_CONFIG_IRQ_PRIORITY 6
#endif

// <o> NRF_SPI_DRV_MISO_PULLUP_CFG  - MISO PIN pull-up configuration.
 
// <0=> NRF_GPIO_PIN_NOPULL 
// <1=> NRF_GPIO_PIN_PULLDOWN 
// <3=> NRF_GPIO_PIN_PULLUP 

#ifndef NRF_SPI_DRV_MISO_PULLUP_CFG
#define NRF_SPI_DRV_MISO_PULLUP_CFG 1
#endif

// <e> SPI0_ENABLED - Enable SPI0 instance
//==========================================================
#ifndef SPI0_ENABLED
#define SPI0_ENABLED 1
#endif
// <q> SPI0_USE_EASY_DMA  - Use EasyDMA
 

#ifndef SPI0_USE_EASY_DMA
#define SPI0_USE_EASY_DMA 1
#endif

// </e>

// <e> SPI1_ENABLED - Enable SPI1 instance
//==========================================================
#ifndef SPI1_ENABLED
#define SPI1_ENABLED 0
#endif
// <q> SPI1_USE_EASY_DMA  - Use EasyDMA
 

#ifndef SPI1_USE_EASY_DMA
#define SPI1_USE_EASY_DMA 1
#endif

// </e>

// <e> SPI2_ENABLED - Enable SPI2 instance
//==========================================================
#ifndef SPI2_ENABLED
#define SPI2_ENABLED 0
#endif
// <q> SPI2_USE_EASY_DMA  - Use EasyDMA
 

#ifndef SPI2_USE_EASY_DMA
#define SPI2_USE_EASY_DMA 1
#endif

// </e>

// </e>

[venkatesha kj]

i am getting error like this

undefined reference to `nrfx_prs_acquire'

[Einar Thorsrud]

Ah, yes. I did not think about that. Assuming you have added the requiered include folder etc you are lacking the PRS configuraiton in sdk_config.h. Depending on which sdk_config.h you used as a starting point there may be more like this. Please search for NRFX_PRS_ENABLED and NRFX_PRS_BOX_4_ENABLED in sdk_config.h. You may need to do this with other components as well.