芯片:
STM32f405, 做的功能是SPI的dma传输,
st正常接收是这样的,0xAB 0xBA 0xA0 ~~~~~~
假如出现异常 0x0 0xAB 0xBA 0xA0~~~~~
出现这种情况,我如何让系统SPI恢复,能正常接收。
void DMA2_Stream0_IRQHandler(void)
{
GPIOB->BSRRH = GPIO_Pin_5;
/* Test on DMA Stream Transfer Complete interrupt */
//if (DMA_GetFlagStatus(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF))
if(DMA_Ge
tiTStatus(SPIx_RX_DMA_STREAM, DMA_IT_TCIF0))
{
DMA_ClearITPendingBit(SPIx_RX_DMA_STREAM, DMA_IT_TCIF0);
DMA_ClearFlag(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF);
ab =spi_aRxBuffer[0];
ba =spi_aRxBuffer[1];
spi_head_cmd =spi_aRxBuffer[2];
if((ab ==0xAB) (ba ==0xBA ))
{
spi_deal_handle(package_status);
ab =0;
ba =0;
}
else //
这是异常处理,但是我发现没有恢复正常
{
dma_reinit();
}
函数如下:
void dma_reinit(void)
{
DMA_Cmd(SPIx_RX_DMA_STREAM,DISABLE);
DMA_ClearFlag(SPIx_RX_DMA_STREAM,DMA_FLAG_TEIF0 | DMA_FLAG_DMEIF0 | DMA_FLAG_FEIF0);
}
void spi_receive_data_enable(void)
{
DMA_ClearFlag(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF);
//DMA_DeInit(SPIx_TX_DMA_STREAM);
DMA_DeInit(SPIx_RX_DMA_STREAM);
/* Configure DMA Initialization Structure */
DMA_InitStructure.DMA_BufferSize = SPI_BUFFERSIZE ;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable ;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull ;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_INC4;//DMA_MemoryBurst_Single ;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t) ( (SPIx_WIFI->DR)) ;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
/* Configure TX DMA */
// DMA_InitStructure.DMA_Channel = SPIx_TX_DMA_CHANNEL ;
// DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral ;
// DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)spi_aTxBuffer ;
// DMA_Init(SPIx_TX_DMA_STREAM, DMA_InitStructure);
/* Configure RX DMA */
DMA_InitStructure.DMA_Channel = SPIx_RX_DMA_CHANNEL ;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory ;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)spi_aRxBuffer ;
DMA_Init(SPIx_RX_DMA_STREAM, DMA_InitStructure);
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_Init(SPIx_WIFI, SPI_InitStructure);
//DMA_ClearFlag(SPIx_RX_DMA_STREAM,SPIx_RX_DMA_FLAG_TCIF);
DMA_ITConfig(SPIx_RX_DMA_STREAM, DMA_IT_TC, ENABLE); //wyz add
DMA_Cmd(SPIx_RX_DMA_STREAM,ENABLE);
SPI_I2S_DMACmd(SPIx_WIFI, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_Cmd(SPIx_WIFI, ENABLE);
}
spi_receive_data_enable();
}
}