SPI nrf52832

Question

hi, 
 I am trying to add SPI (master) codes into the ble_app_uart. 
 My setting for SPI is as follows: 
 #define SPI1_ENABLED 1 // #define SPI_INSTANCE 1 /**< SPI instance index. */ //#define SPI0_ENABLED 0 #define SPIM_IN_USE 0 #define SPI_IN_USE 1 
 I have included the nrf_drv_spi.h and nrf_drv_config.h in main.c 
 yet when I am trying to compile the project. One error occurred in nrf_drv_spi.c(which I added into the project) indicting "wrong configuration" 
 And even if I assigned the value of SPIM_IN_USE and SPI_IN_USE, the error still occurs. After compiling, a window shows saying "browse information of one or more files is not available" 
 I am wondering what's wrong with it?

haakonsh · Answer

Hey maslooo,

You should add the following lines of code to your sdk_config.h file:

#ifndef SPI_SCK_PIN
#define SPI_SCK_PIN YOUR_PIN_NUMBER
#endif

#ifndef SPI_MISO_PIN
#define SPI_MISO_PIN YOUR_PIN_NUMBER
#endif

#ifndef SPI_MOSI_PIN
#define SPI_MOSI_PIN YOUR_PIN_NUMBER
#endif

#ifndef SPI_SS_PIN
#define SPI_SS_PIN YOUR_PIN_NUMBER
#endif


// <e> SPI_ENABLED - nrf_drv_spi - SPI/SPIM peripheral driver
//==========================================================
#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 7
#endif

// <o> SPI_DEFAULT_FREQUENCY  - SPI frequency
 
// <33554432=> 125 kHz 
// <67108864=> 250 kHz 
// <134217728=> 500 kHz 
// <268435456=> 1 MHz 
// <536870912=> 2 MHz 
// <1073741824=> 4 MHz 
// <2147483648=> 8 MHz 

#ifndef SPI_DEFAULT_FREQUENCY
#define SPI_DEFAULT_FREQUENCY 1073741824
#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

main.c:

#include "nrf_drv_spi.h"

#define SPI_INSTANCE  0 /**< SPI instance index. */
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE);  /**< SPI instance. */
static volatile bool spi_xfer_done;  /**< Flag used to indicate that SPI instance completed the transfer. */

#define TEST_STRING "Nordic"
static uint8_t       m_tx_buf[] = TEST_STRING;           /**< TX buffer. */
static uint8_t       m_rx_buf[sizeof(TEST_STRING) + 1];    /**< RX buffer. */
static const uint8_t m_length = sizeof(m_tx_buf);        /**< Transfer length. */

/**
 * @brief SPI user event handler.
 * @param event
 */
void spi_event_handler(nrf_drv_spi_evt_t const * p_event,
                       void *                    p_context)
{
    spi_xfer_done = true;
}

void spi_init(void)
{
    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.ss_pin   = SPI_SS_PIN;
    spi_config.miso_pin = SPI_MISO_PIN;
    spi_config.mosi_pin = SPI_MOSI_PIN;
    spi_config.sck_pin  = SPI_SCK_PIN;
    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));
}

int main(void)
{
   spi_init();
   
    while (1)
    {   /*** transfer the test string every 200ms***/
    
        // Reset rx buffer and transfer done flag
        memset(m_rx_buf, 0, m_length);
        spi_xfer_done = false;

        APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, m_length, m_rx_buf, m_length));

        while (!spi_xfer_done)
        {
            __WFE();
        }

        nrf_delay_ms(200);
    }
}

Cheers,

Håkon.