void SPI1_init(void) //SPI1口初始化
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能GPIOA时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); //使能SPI1时钟
//Configure SPI1 pins: SCK, MISO and MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; //管脚SPI复用 (《STM32F4为》PA5:SPI1_SCK,PA6:SPI1_MISO,PA7:SPI1_MOSI)
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); //配置到管脚
GPIO_PinAFConfig(GPIOA,5,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,6,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,7,GPIO_AF_SPI1);
//SPI模块配置
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //8位帧数据结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //同步时钟的空闲状态为高电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //同步时钟的第二个跳变沿(上升或下降)数据被采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS 信号由硬件(NSS管脚)还是软件(使用 SSI位)管理:内部NSS信号由SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC计算的多项式
SPI_Init(SPI1, &SPI_InitStructure); //配置到SPIx寄存器
SPI_Cmd(SPI1, ENABLE); //使能SPI外设
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
unsigned char SPI1_TransmitByte(unsigned char TxData)
{
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);//等待发送区空
SPI_I2S_SendData(SPI1, TxData); //SPIx发送一个byte 数据
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //等待接收完一个byte
return SPI_I2S_ReceiveData(SPI1); //返回接收的数据
}
void SPI1_init(void) //SPI1口初始化
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能GPIOA时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); //使能SPI1时钟
//Configure SPI1 pins: SCK, MISO and MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; //管脚SPI复用 (《STM32F4为》PA5:SPI1_SCK,PA6:SPI1_MISO,PA7:SPI1_MOSI)
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); //配置到管脚
GPIO_PinAFConfig(GPIOA,5,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,6,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,7,GPIO_AF_SPI1);
//SPI模块配置
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //8位帧数据结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //同步时钟的空闲状态为高电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //同步时钟的第二个跳变沿(上升或下降)数据被采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS 信号由硬件(NSS管脚)还是软件(使用 SSI位)管理:内部NSS信号由SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC计算的多项式
SPI_Init(SPI1, &SPI_InitStructure); //配置到SPIx寄存器
SPI_Cmd(SPI1, ENABLE); //使能SPI外设
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
unsigned char SPI1_TransmitByte(unsigned char TxData)
{
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);//等待发送区空
SPI_I2S_SendData(SPI1, TxData); //SPIx发送一个byte 数据
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //等待接收完一个byte
return SPI_I2S_ReceiveData(SPI1); //返回接收的数据
}
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