求指点：STM32F103VC的SDIO读SD卡单块读成功，多块读却不行？

longline

各位牛人，小弟最近做一个项目，会用到STM32F103VC的SDIO读SD卡，单块读成功速度可以达到1M，多块读却不行？
请求各位能给予指点，或者相关代码参考。谢谢

我用的是stm32_eval_sdio_sd.c 的4.5版，
  * @file    stm32_eval_sdio_sd.c
  * @author  MCD Application Team
  * @version V4.5.0
  * @date    07-March-2011
  * @brief   This file provides a set of functions needed to manage the SDIO SD
  *          Card memory mounted on STM32xx-EVAL board (refer to stm32_eval.h
  *          to know about the boards supporting this memory).
-------------------------------------------------------------------------------------------------------------------------------------

SD_Error SD_ReadMultiBlocks(uint8_t *readbuff, uint32_t ReadAddr, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
  SD_Error errorstatus = SD_OK;
  TransferError = SD_OK;
  TransferEnd = 0;
  StopCondition = 1;
 
  SDIO->DCTRL = 0x0;

  if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
  {
    BlockSize = 512;
    ReadAddr /= 512;
  }

  /*!< Set Block Size for Card */
  SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) BlockSize;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SET_BLOCKLEN;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);

  errorstatus = CmdResp1Error(SD_CMD_SET_BLOCKLEN);

  if (SD_OK != errorstatus)
  {
    return(errorstatus);
  }
   
  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = NumberOfBlocks * BlockSize;
  SDIO_DataInitStructure.SDIO_DataBlockSize = (uint32_t) 9 << 4;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToSDIO;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
  SDIO_DataConfig(&SDIO_DataInitStructure);

  /*!< Send CMD18 READ_MULT_BLOCK with argument data address */
  SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)ReadAddr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_READ_MULT_BLOCK;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);

  errorstatus = CmdResp1Error(SD_CMD_READ_MULT_BLOCK);

  if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }

  SDIO_ITConfig(SDIO_IT_RXOVERR|SDIO_IT_DTIMEOUT|SDIO_IT_DCRCFAIL|SDIO_IT_DATAEND, ENABLE);
  SDIO_DMACmd(ENABLE);
  SD_LowLevel_DMA_RxConfig((uint32_t *)readbuff, (NumberOfBlocks * BlockSize));
 
  errorstatus = SD_WaitReadOperation();                                     //121112    等待读操作完成
if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }
 
  while(SD_GetStatus()!=SD_TRANSFER_OK);                            //121112   
 
  return(errorstatus);
}
 

正点原子

表示还没玩过...

longline

回复【2楼】正点原子:
---------------------------------
你可以研究一下嘛！应该有高手玩过呀！