AnsweredAssumed Answered

DMA Configuration from SRAM to SD Card

Question asked by ng.carmen on May 30, 2012
Latest reply on Jan 28, 2013 by ng.carmen
I am new in developing firmware by using STM32L152VBT6. I need to configure DMA to transfer data from SRAM to SD Card. The data would be {1, 2, 3, 4, 5, 6, 7, 8, 9, 0}. However, I could not write into SD Card and I could not find any problem about it.
     
     DMA_InitTypeDef DMA_TestStructure;
     
     //Enables the DMA1 peripheral clock.
     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
     
     SD_Init();
     SD_CS_LOW();
     DMA_DeInit(DMA1_Channel5);
     DMA_TestStructure.DMA_PeripheralBaseAddr = (uint32_t)SD_SPI_DR;
       DMA_TestStructure.DMA_MemoryBaseAddr = (uint32_t)write_data;
      DMA_TestStructure.DMA_DIR = DMA_DIR_PeripheralDST;
       DMA_TestStructure.DMA_BufferSize = 10;
       DMA_TestStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
      DMA_TestStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
       DMA_TestStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
       DMA_TestStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
      DMA_TestStructure.DMA_Mode = DMA_Mode_Normal;
       DMA_TestStructure.DMA_Priority = DMA_Priority_High;
       DMA_TestStructure.DMA_M2M = DMA_M2M_Disable;
     DMA_Init(DMA1_Channel5, &DMA_TestStructure);     
     
     SPI_I2S_DMACmd(SD_SPI, SPI_I2S_DMAReq_Tx, ENABLE);

     SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, write_add, 0xFF);
     
     if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
       {
              /*!< Send a dummy byte */
              SD_WriteByte(SD_DUMMY_BYTE);


    /*!< Send the data token to signify the start of the data */
    SD_WriteByte(0xFE);
    
          DMA_Cmd(DMA1_Channel5, ENABLE);
               
          while (!DMA_GetFlagStatus(DMA1_FLAG_TC5));
                              
          SD_ReadByte();
              SD_ReadByte();
          
              /* Read data response */
             if (SD_GetDataResponse() == SD_DATA_OK)
              {
                       rvalue = SD_RESPONSE_NO_ERROR;
              }
          
     }
     
     
     SD_CS_HIGH();  
     SD_WriteByte(SD_DUMMY_BYTE);
     DMA_Cmd(DMA1_Channel5, DISABLE);


Outcomes