RE: SPI nrf52832

haakonsh — Tue, 26 Feb 2019 13:19:55 GMT

You've either forgot to include the necessary source/header files, or the compiler does not compile the code in the source/header files because the necessary definitions are not set in sdk_config.h.

RE: SPI nrf52832

gauthamranganathan — Mon, 18 Feb 2019 07:27:40 GMT

Hi haakonsh I have the exact same problem. I am unable to successfully build the project after merging SPI and ble_app_uart example. I get an undefined symbol nrfx_spi_init. (refered from nrf_drv_spi.o)

can you please help me with this?

RE: SPI nrf52832

Darshansm5549 — Thu, 31 Jan 2019 11:10:52 GMT

i included "nrf_drv_spi.h" in main and "nrf_drv_spi.c" in project

RE: SPI nrf52832

haakonsh — Thu, 17 Jan 2019 12:31:21 GMT

Have you included the spi driver in your project?

RE: SPI nrf52832

Darshansm5549 — Thu, 17 Jan 2019 06:03:04 GMT

Hi Haakonsh,

i am trying this, i am getting error

undefined reference to `nrf_drv_spi_init'

RE: SPI nrf52832

haakonsh — Mon, 12 Feb 2018 13:02:23 GMT

No problem maslooo :)

RE: SPI nrf52832

masloooo — Mon, 12 Feb 2018 12:00:01 GMT

hi haakonsh

Thanks for your help, this time it went well.

RE: SPI nrf52832

haakonsh — Mon, 12 Feb 2018 09:20:08 GMT

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.