|
|
void SPI_init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);//使能SP1I和GPIOA时钟
GPIO_PinAFConfig(GPIOA,GPIO_PinSource5|GPIO_PinSource6|GPIO_PinSource7,GPIO_AF_SPI1);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;//MOSI SCK复用
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;//复用推挽输出
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;//SPI_CS
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;//推挽输出
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
SPI_Cmd(SPI1, DISABLE);
SPI_InitStructure.SPI_Direction= SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft ;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)==RESET);
SPI_I2S_SendData(SPI1,data);
printf("数据发送完毕!!!\r\n");
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //检查指定的SPI标志位设置与否:接受缓存非空标志位
re_data = SPI_I2S_ReceiveData(SPI1); //返回通过SPI1最近接收的数据
printf ("接收数据成功 %x\r\n",re_data);
运行之后，死在判断发送标志位是否为RESET那，请问是什么原因呀？
|
|
