nrf52832 SPI驱动文件

 spi_driver.c

/* Includes ------------------------------------------------------------------*/
#include "spi_driver.h"
#include "nrf_drv_spi.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

#include <string.h>

#include "nrf_log.h"
#include "nrf_log_ctrl.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   SPI_BUFSIZE   8

static uint8_t        m_tx_buf[SPI_BUFSIZE] = {0};             /**< TX buffer. */
static uint8_t        m_rx_buf[SPI_BUFSIZE] = {0};             /**< RX buffer. */
static const uint8_t  m_length = SPI_BUFSIZE;                  /**< Transfer length. */
static uint8_t        SPIReadLength, SPIWriteLength;


/**
 * @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;
    //NRF_LOG_INFO("Transfer completed.");
    if (m_rx_buf[0] != 0)
    {
        //NRF_LOG_INFO(" Received:");
        //NRF_LOG_HEXDUMP_INFO(m_rx_buf, strlen((const char *)m_rx_buf));
    }
}


void SPI_Init(void)
{
  
    /* SPI 初始化 */
    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));

}


/*******************************************************************************
* Function Name: SPI_ReadReg
* Description: Generic Reading function. It must be fullfilled with either
*: I2C or SPI reading functions
* Input: Register Address
* Output: Data REad
* Return: None
*******************************************************************************/
uint8_t SPI_ReadReg(uint8_t Reg, uint8_t* Data) 
{
  
    // Reset rx buffer and transfer done flag
    memset(m_rx_buf, 0, m_length);
    spi_xfer_done = false;
  
    m_tx_buf[0] = Reg | SPI_READBIT;
  m_tx_buf[1] = 0x56;
    SPIWriteLength = 2;
    SPIReadLength = 2;
  
    APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, SPIWriteLength, m_rx_buf, SPIReadLength));

    while (!spi_xfer_done)
    {
       __WFE();
    } 
    *Data =  m_rx_buf[1];
    return m_rx_buf[1];
}


/*******************************************************************************
* Function Name: SPI_WriteReg
* Description: Generic Writing function. It must be fullfilled with either
*: I2C or SPI writing function
* Input: Register Address, Data to be written
* Output: None
* Return: None
*******************************************************************************/
uint8_t SPI_WriteReg(uint8_t WriteAddr, uint8_t Data) 
{
  
    memset(m_rx_buf, 0, m_length);
    spi_xfer_done = false;
  
    m_tx_buf[0] = WriteAddr;
  m_tx_buf[1] = Data;
    SPIWriteLength = 2;
    SPIReadLength = 0;
  
    APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, SPIWriteLength, m_rx_buf, SPIReadLength));

    while (!spi_xfer_done)
    {
       __WFE();
    } 
    return 1;
}

nrf_driver.h

#ifndef _SPI_DRIVER_H
#define _SPI_DRIVER_H


#include <stdbool.h>
#include <stdint.h>




#define SPI_SCK_PIN           3
#define SPI_MISO_PIN          28 
#define SPI_MOSI_PIN          29
#define SPI_SS_PIN            2


#define SPI_READBIT           (0x80)


void    SPI_Init(void) ;
uint8_t SPI_WriteReg(uint8_t WriteAddr, uint8_t Data) ;
uint8_t SPI_ReadReg(uint8_t Reg, uint8_t* Data) ;


#endif /* _SPI_DRIVER_H */

原文地址：https://blog.csdn.net/u012840934/article/details/142727351

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