大家好：
如题，主的stm32发送0x55,0x88，反复50次，从的接收0x55,0x88，0x55,0x88，0x55,0x55,0x88。。。。。接收到的数据还很有规律，都是每三次有一次错误，头两次都正确，第三次就变成了0x55,0x55,0x88。下面是程序，请大家帮忙看看。
主stm32
void SPI_Configuration(void)
{
/* SPI1 configuration ------------------------------------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
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_2Edge;
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(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
}
send_data
{
for(i=0;i<50;i++)
{
/* Wait for SPI1 Tx buffer empty */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
/* Send SPI1 data */
SPI_I2S_SendData(SPI1, 0x55);
/* Wait for SPI1 Tx buffer empty */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
/* Send SPI1 data */
SPI_I2S_SendData(SPI1, 0x88); //中断状态，nss没有设置。例程也没有设置
}
从stm32
void SPI_Configuration(void)
{
/* SPI1 configuration ------------------------------------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;//SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1 RXNE interrupt */
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
}
void SPI1_IRQHandler(void)
{
RAM[RxIdx++] = SPI_I2S_ReceiveData(SPI1);
} |
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