zhuo1000 发表于 2015-8-3 15:53:53

ST SPI DMA接收异常

   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。


附：
附：
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_GetITStatus(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;
             ba =spi_aRxBuffer;            
            spi_head_cmd =spi_aRxBuffer;
       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();


}
}

zhuo1000 发表于 2015-8-3 15:55:12

我的思路是，接收异常，我清理掉错误标志，spi disable,然后重新初始化
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)spi_aRxBuffer ; ,再使能。但是这样做，还是没能恢复正常。

你好我好大家好！ 发表于 2015-8-3 21:49:19

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