sdio上电读取SD卡有时死循环了，卡使用高速卡4g , 但 2G 1G可以

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CJQ_ENJOY| 助理工程师

楼主 | 2015-1-19 08:48 | 只看该作者回帖奖励

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4G, SD卡, IO, ST, ni

sdio上电读取SD卡有时死循环了，卡使用高速卡4g ,  但 2G 1G可以

sdio上电读取SD卡有时死循环了，卡使用高速卡
while ((!validvoltage) && (count < SD_MAX_VOLT_TRIAL))
   {

   /*!< SEND CMD55 APP_CMD with RCA as 0 */
   SDIO_CmdInitStructure.SDIO_Argument = 0x00;
   SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_APP_CMD;
   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_APP_CMD);

   if (errorstatus != SD_OK)
   {
      return(errorstatus);
   }
   SDIO_CmdInitStructure.SDIO_Argument = SD_VOLTAGE_WINDOW_SD | SDType;
   SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SD_APP_OP_COND;
   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 = CmdResp3Error();
   if (errorstatus != SD_OK)
   {
      return(errorstatus);
   }

   response = SDIO_GetResponse(SDIO_RESP1);
   validvoltage = (((response >> 31) == 1) ? 1 : 0);
   count++;
   }

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