SPI不运行

qjxtfjfghy · 发表于 2014-3-18 17:22:50

我的配置如下,为什么不运行
void SPI1_Init(void)
{
/*定义结构体，下面NSS配置时也要用到GPIO所以这里一起定义*/
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

/* 使能 SPI1 & GPIOA &GPIOB时钟 */
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1|RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOA, ENABLE);
RCC->APB2ENR |= (1<<0); //AFIO
RCC->APB2ENR |= (1<<3); //GPIOB
RCC->APB2ENR |= (1<<4); //GPIOC
RCC->APB2ENR |= (1<<12); //SPI

/* Configure GDO0 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOC, &GPIO_InitStructure);

/* Configure SPI1 pins: SCK and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure SPI1 pins: MISO ---------------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//SPI1 NSS for PA4
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* SPI1 configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx; //SPI1设置为一线发送
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_64; //定义波特率预分频的值: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(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE); //使能SPI1外设
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE |SPI_I2S_IT_RXNE, ENABLE);   //使用发送空,接收非空中断

}