stm32F0 的NRF24L01驱动程序

CuiDaBo · 发表于 2019-5-16 20:37:53

#include "24l01_spi.h"

//串行外设接口SPI的初始化，SPI配置成主模式
//本例程选用SPI1对NRF24L01进行读写操作，先对SPI1进行初始化
void SPIx_Init(void)
{
SPI_InitTypeDef  SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPIx, ENABLE );
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOx, ENABLE);


//SPI1口初始化
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = SPIx_SCK;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  //复用推挽输出
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIO_SPIx, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = SPIx_MISO;
GPIO_Init(GPIO_SPIx, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin = SPIx_MOSI;
GPIO_Init(GPIO_SPIx, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);

GPIO_SetBits(GPIO_SPIx,SPIx_MISO| SPIx_MOSI| SPIx_SCK);
/* SPI2 configuration */                                           //初始化SPI1结构体
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //SPI1设置为两线全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;                   //设置SPI1为主模式
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;             //SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;                      //串行时钟在不操作时，时钟为低电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;                      //第一个时钟沿开始采样数据
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                      //NSS信号由软件（使用SSI位）管理
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;  //SPI波特率预分频值为8
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;                   //数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7;                         //CRC值计算的多项式

SPI_Init(SPIx, &SPI_InitStructure);                               //根据SPI_InitStruct中指定的参数初始化外设SPI2寄存器

SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF);

/* Enable SPI2  */
SPI_Cmd(SPIx, ENABLE);                                           //使能SPI1外设

SPIx_ReadWriteByte(0xff);                                        //启动传输
}

u8 SPIx_ReadWriteByte(u8 TxData)                                     //SPI读写数据函数
{
u8 retry=0;
/* Loop while DR register in not emplty */
while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET)    //发送缓存标志位为空
{
retry++;
if(retry>200)return 0;
}
/* Send byte through the SPI1 peripheral */
SPI_SendData8(SPIx, TxData);                                  //通过外设SPI1发送一个数据
retry=0;
/* Wait to receive a byte */
while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET) //接收缓存标志位不为空
{
retry++;
if(retry>200)return 0;
}
/* Return the byte read from the SPI bus */
return SPI_ReceiveData8(SPIx);                               //通过SPI1返回接收数据
}