Posted on September 12, 2012 at 08:57Hi!
I've got another problem with my STM32F205. The Data Timeout timer doesn't start and when there is no answer from SD Card, the system waits in loop for watchdog reset ;).
Here is a function. The code is working properly but sometimes (after re-init of the card) it hangs up.
SD_Error SD_SendSDStatus(uint32_t *psdstatus)
{
SD_Error errorstatus = SD_OK;
uint32_t count = 0;
if (SDIO_GetResponse(SDIO_RESP1) & SD_CARD_LOCKED)
{
errorstatus = SD_LOCK_UNLOCK_FAILED;
return(errorstatus);
}
/*!< Set block size for card if it is not equal to current block size for card. */
SDIO_CmdInitStructure.SDIO_Argument = 64;
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 (errorstatus != SD_OK)
{
return(errorstatus);
}
/*!< CMD55 */
SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) RCA << 16;
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_DataInitStructure.SDIO_DataTimeOut = 0x10000;
SDIO_DataInitStructure.SDIO_DataLength = 64;
SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_64b;
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 ACMD13 SD_APP_STAUS with argument as card's RCA.*/
SDIO_CmdInitStructure.SDIO_Argument = 0;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SD_APP_STAUS;
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_SD_APP_STAUS);
if (errorstatus != SD_OK)
{
return(errorstatus);
}
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 < 8; count++)
{
*(psdstatus + count) = SDIO_ReadData();
}
psdstatus += 8;
}
}
The
red while
sometimes never ends. Why the DataTimeout do not occur? Why it not even starts? When I stop my program and watch the SDIO->DTIMER value it's still on the start value. I wan't to rewrite the library by own, because it's not ''FreeRTOS ready'', but I must understand how it works and why it's not working as I think.
Thanks for Your help
Best regards
Konoppo
#sdio #timeout
