NRF24L01STM32的驱动程序

NRF24L01是一款2.4GHz无线收发模块，可用于Arduino、STM32等单片机上，实现无线通信功能。下面是一个基于STM32的NRF24L01驱动程序，供参考：

#include "stm32f10x.h"
#include "nrf24l01.h"

void delay_us(uint32_t nus)
{
    uint32_t i,j;
    for(i=0;i<nus;i++)
        for(j=0;j<8;j++);
}

void delay_ms(uint32_t nms)
{
    uint32_t i,j;
    for(i=0;i<nms;i++)
        for(j=0;j<8000;j++);
}

void NRF24L01_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(NRF24L01_CE_GPIO_CLK | NRF24L01_CSN_GPIO_CLK, ENABLE);

    GPIO_InitStructure.GPIO_Pin = NRF24L01_CE_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(NRF24L01_CE_GPIO_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = NRF24L01_CSN_PIN;
    GPIO_Init(NRF24L01_CSN_GPIO_PORT, &GPIO_InitStructure);
}

void NRF24L01_SPI_Init(void)
{
    SPI_InitTypeDef  SPI_InitStructure;

    RCC_APB2PeriphClockCmd(NRF24L01_SPI_CLK, ENABLE);

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(NRF24L01_SPI, &SPI_InitStructure);

    SPI_Cmd(NRF24L01_SPI, ENABLE);
}

uint8_t NRF24L01_SPI_RW(uint8_t byte)
{
    while (SPI_I2S_GetFlagStatus(NRF24L01_SPI, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(NRF24L01_SPI, byte);
    while (SPI_I2S_GetFlagStatus(NRF24L01_SPI, SPI_I2S_FLAG_RXNE) == RESET);
    return SPI_I2S_ReceiveData(NRF24L01_SPI);
}

void NRF24L01_CE_Low(void)
{
    GPIO_ResetBits(NRF24L01_CE_GPIO_PORT, NRF24L01_CE_PIN);
}

void NRF24L01_CE_High(void)
{
    GPIO_SetBits(NRF24L01_CE_GPIO_PORT, NRF24L01_CE_PIN);
}

void NRF24L01_CSN_Low(void)
{
    GPIO_ResetBits(NRF24L01_CSN_GPIO_PORT, NRF24L01_CSN_PIN);
}

void NRF24L01_CSN_High(void)
{
    GPIO_SetBits(NRF24L01_CSN_GPIO_PORT, NRF24L01_CSN_PIN);
}

void NRF24L01_Init(void)
{
    NRF24L01_GPIO_Init();
    NRF24L01_SPI_Init();

    NRF24L01_CE_Low();
    NRF24L01_CSN_High();

    delay_ms(5);

    NRF24L01_Write_Reg(NRF24L01_REG_CONFIG, 0x08);    //16位CRC，上电
    NRF24L01_Write_Reg(NRF24L01_REG_EN_AA, 0x00);     //禁用自动应答
    NRF24L01_Write_Reg(NRF24L01_REG_EN_RXADDR, 0x01); //允许接收通道0
    NRF24L01_Write_Reg(NRF24L01_REG_SETUP_AW, 0x03);  //地址宽度为5字节
    NRF24L01_Write_Reg(NRF24L01_REG_SETUP_RETR, 0x00);//自动重传延时250us，不重发
    NRF24L01_Write_Reg(NRF24L01_REG_RF_CH, 0x01);     //射频通道为2.401GHz
    NRF24L01_Write_Reg(NRF24L01_REG_RF_SETUP, 0x06);  //250kbps，0dBm
    NRF24L01_Write_Reg(NRF24L01_REG_RX_PW_P0, 0x01);  //接收通道0的有效数据宽度为1字节
    NRF24L01_Write_Reg(NRF24L01_REG_DYNPD, 0x00);     //禁用动态数据长度
    NRF24L01_Write_Reg(NRF24L01_REG_FEATURE, 0x00);   //禁用特性

    NRF24L01_Flush_TX_FIFO();
    NRF24L01_Flush_RX_FIFO();

    NRF24L01_CE_High();

    delay_ms(5);
}

void NRF24L01_Write_Reg(uint8_t reg, uint8_t value)
{
    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_W_REGISTER | reg);
    NRF24L01_SPI_RW(value);

    NRF24L01_CSN_High();
}

uint8_t NRF24L01_Read_Reg(uint8_t reg)
{
    uint8_t value;

    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_R_REGISTER | reg);
    value = NRF24L01_SPI_RW(NRF24L01_CMD_NOP);

    NRF24L01_CSN_High();

    return value;
}

void NRF24L01_Write_Buf(uint8_t reg, uint8_t *pBuf, uint8_t len)
{
    uint8_t i;

    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_W_REGISTER | reg);
    for (i = 0; i < len; i++) {
        NRF24L01_SPI_RW(pBuf[i]);
    }

    NRF24L01_CSN_High();
}

void NRF24L01_Read_Buf(uint8_t reg, uint8_t *pBuf, uint8_t len)
{
    uint8_t i;

    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_R_REGISTER | reg);
    for (i = 0; i < len; i++) {
        pBuf[i] = NRF24L01_SPI_RW(NRF24L01_CMD_NOP);
    }

    NRF24L01_CSN_High();
}

void NRF24L01_Flush_TX_FIFO(void)
{
    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_FLUSH_TX);

    NRF24L01_CSN_High();
}

void NRF24L01_Flush_RX_FIFO(void)
{
    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_FLUSH_RX);

    NRF24L01_CSN_High();
}

void NRF24L01_TX_Mode(void)
{
    uint8_t value;

    NRF24L01_CE_Low();

    value = NRF24L01_Read_Reg(NRF24L01_REG_CONFIG);
    value &= ~NRF24L01_MASK_PRIM_RX;
    value |= NRF24L01_BIT_PWR_UP;
    NRF24L01_Write_Reg(NRF24L01_REG_CONFIG, value);

    NRF24L01_CE_High();

    delay_us(130);
}

void NRF24L01_RX_Mode(void)
{
    uint8_t value;

    NRF24L01_CE_Low();

    value = NRF24L01_Read_Reg(NRF24L01_REG_CONFIG);
    value |= NRF24L01_MASK_PRIM_RX;
    value |= NRF24L01_BIT_PWR_UP;
    NRF24L01_Write_Reg(NRF24L01_REG_CONFIG, value);

    NRF24L01_CE_High();

    delay_us(130);
}

void NRF24L01_Write_TX_Payload(uint8_t *pBuf, uint8_t len)
{
    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_W_TX_PAYLOAD);
    while (len--) {
        NRF24L01_SPI_RW(*pBuf++);
    }

    NRF24L01_CSN_High();
}

void NRF24L01_Read_RX_Payload(uint8_t *pBuf, uint8_t len)
{
    NRF24L01_CSN_Low();

    NRF24L01_SPI_RW(NRF24L01_CMD_R_RX_PAYLOAD);
    while (len--) {
        *pBuf++ = NRF24L01_SPI_RW(NRF24L01_CMD_NOP);
    }

    NRF24L01_CSN_High();
}

uint8_t NRF24L01_Get_Status(void)
{
    uint8_t status;

    NRF24L01_CSN_Low();

    status = NRF24L01_SPI_RW(NRF24L01_CMD_NOP);

    NRF24L01_CSN_High();

    return status;
}

uint8_t NRF24L01_Get_FIFO_Status(void)
{
    uint8_t value;

    value = NRF24L01_Read_Reg(NRF24L01_REG_FIFO_STATUS);
    value &= NRF24L01_MASK_FIFO_STATUS;

    return value;
}

这是一个基本的驱动程序，包括GPIO初始化、SPI初始化、各种读写操作函数以及模式转换函数等。需要根据具体的硬件环境进行修改和适配。