STM32F407 sd卡无法读取卡死在 while(SD_GetStatus() != SD_TRANSFER_OK)

morrow00 · 发表于 2016-1-15 10:20:35

本人在做一个项目，里面需要读取SD卡的图片以及汉字，但是现在无法正常读取。在开发板上程序已经能正常工作，但是到了自己画的PCB板上就无法正常读取了。已测量SD卡各管脚与STM32f407的管脚，相连没有问题。经过单步调试，最后发现程序一直在while(SD_GetStatus() != SD_TRANSFER_OK)死循环，应该是DMA传输的问题，但是程序感觉应该没问题，应该在开发板调试通了，电路板相连也没问题，求大神解答。给个SD初始化的程序吧。
SD_Error SD_Init(void)
{
  __IO SD_Error errorstatus = SD_OK;

  /* ÅäÖÃNVIC */
  SDIO_Interrupts_Config();

  /* SDIO Peripheral Low Level Init */
  SD_LowLevel_Init();

  SDIO_DeInit();

  errorstatus = SD_PowerON();

  if (errorstatus != SD_OK)
  {
/*!< CMD Response TimeOut (wait for CMDSENT flag) */
return(errorstatus);
  }

  errorstatus = SD_InitializeCards();

  if (errorstatus != SD_OK)
  {
/*!< CMD Response TimeOut (wait for CMDSENT flag) */
return(errorstatus);
  }

  /*!< Configure the SDIO peripheral */
  /*!< SDIO_CK = SDIOCLK / (SDIO_TRANSFER_CLK_DIV + 2) */
  /*!< on STM32F4xx devices, SDIOCLK is fixed to 48MHz */
  SDIO_InitStructure.SDIO_ClockDiv = SDIO_TRANSFER_CLK_DIV;
  SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
  SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Disable;
  SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;
  SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_1b;
  SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;
  SDIO_Init(&SDIO_InitStructure);

  /*----------------- Read CSD/CID MSD registers ------------------*/
  errorstatus = SD_GetCardInfo(&SDCardInfo);

  if (errorstatus == SD_OK)
  {
/*----------------- Select Card --------------------------------*/
errorstatus = SD_SelectDeselect((uint32_t) (SDCardInfo.RCA << 16));
  }

  if (errorstatus == SD_OK)
  {
errorstatus = SD_EnableWideBusOperation(SDIO_BusWide_4b);
  }

  return(errorstatus);
}