Posted on February 14, 2012 at 22:20Hi All,
I have a problem with my MMC card. I try to read the EXT_CSD (512 bytes) with no success. Someone can help me please ? Here below my function.
MMC_Error MMC_Get_Ext_CSD ( )
{
MMC_Error errorstatus = MMC_OK;
int count;
SDIO_DataInitStruct.SDIO_DataTimeOut = DataTimeOut;
SDIO_DataInitStruct.SDIO_DataLength =512;
SDIO_DataInitStruct.SDIO_DataBlockSize = SDIO_DataBlockSize_512b;
SDIO_DataInitStruct.SDIO_TransferDir = SDIO_TransferDir_ToSDIO;
SDIO_DataInitStruct.SDIO_TransferMode = SDIO_TransferMode_Block;
SDIO_DataInitStruct.SDIO_DPSM = SDIO_DPSM_Enable;
SDIO_DataConfig(&SDIO_DataInitStruct);
SDIO_CmdInitStruct.SDIO_Argument = 0x00;
SDIO_CmdInitStruct.SDIO_CmdIndex = CMD8;
SDIO_CmdInitStruct.SDIO_Response = SDIO_Response_Short;
SDIO_CmdInitStruct.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStruct.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStruct);
errorstatus = Resp1_Check(CMD8);
if (errorstatus != MMC_OK)
{
return errorstatus ;
}
eMMC_Delay(5);
if (DeviceMode == MMC_POLLING_MODE)
{
while (!(SDIO->STA &(SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_DBCKEND | SDIO_FLAG_STBITERR)))
{
if (SDIO_GetFlagStatus(SDIO_FLAG_RXFIFOHF) != RESET)
{
for (count = 0; count < 128; count++)
{
*(Ext_CSD + count) = SDIO_ReadData();
}
}
}
if (SDIO_GetFlagStatus(SDIO_FLAG_DTIMEOUT) != RESET)
{
SDIO_ClearFlag(SDIO_FLAG_DTIMEOUT);
errorstatus = MMC_DATA_TIMEOUT;
return(errorstatus);
}
else if (SDIO_GetFlagStatus(SDIO_FLAG_DCRCFAIL) != RESET)
{
SDIO_ClearFlag(SDIO_FLAG_DCRCFAIL);
errorstatus = MMC_DATA_CRC_FAIL;
return(errorstatus);
}
else if (SDIO_GetFlagStatus(SDIO_FLAG_RXOVERR) != RESET)
{
SDIO_ClearFlag(SDIO_FLAG_RXOVERR);
errorstatus = MMC_RX_OVERRUN;
return(errorstatus);
}
else if (SDIO_GetFlagStatus(SDIO_FLAG_STBITERR) != RESET)
{
SDIO_ClearFlag(SDIO_FLAG_STBITERR);
errorstatus = MMC_START_BIT_ERR;
return(errorstatus);
}
#if 0
/* READ the data available in FIFO */
while (SDIO_GetFlagStatus(SDIO_FLAG_RXDAVL) != RESET)
{
*tempbuff = SDIO_ReadData();
tempbuff++;
}
#endif
/* Clear all the static flags */
SDIO_ClearFlag(SDIO_FLAGS);
}
return(errorstatus);
}
