香主你好：
我做SPI DMA接收的试验，使用ST的例程。操作没有问题。
可是不能实现循环接收，例程是发送一次，而后查询标志，就结束了。
如何实现不断查询标志的接收啊，也就是接收循环起来！！！万分感谢。
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();
/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();
/* DMA1 channel4 configuration ---------------------------------------------*/
DMA_DeInit(DMA1_Channel4);
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)SPI2_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SPI2_Buffer_Rx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BufferSize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
/* 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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* SPI2 configuration ------------------------------------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_Init(SPI2, &SPI_InitStructure);
/* Enable SPI1 NSS output for master mode */
SPI_SSOutputCmd(SPI1, ENABLE);
/* Enable SPI2 Rx request */
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);
/* Enable SPI2 */
SPI_Cmd(SPI2, ENABLE);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
/* Enable DMA1 Channel4 */
DMA_Cmd(DMA1_Channel4, ENABLE);
/* Transfer procedure */
while (TxIdx < BufferSize)
{
/* Wait for SPI1 Tx buffer empty */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
/* Send SPI1 data */
SPI_I2S_SendData(SPI1, SPI1_Buffer_Tx[TxIdx++]);
}
/* Wait for DMA1 channel4 transfer complete */
while (!DMA_GetFlagStatus(DMA1_FLAG_TC4));
/* Check the corectness of written data */
TransferStatus = Buffercmp(SPI2_Buffer_Rx, SPI1_Buffer_Tx, BufferSize);
/* TransferStatus = PASSED, if the transmitted and received data
are equal */
/* TransferStatus = FAILED, if the transmitted and received data
are different */
while (1)
{}
}
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