Question
Does the HAL support MMC?
Posted on May 12, 2015 at 01:12
So in `SD_PowerON` there is a comment at the bottom that says `/* else MMC Card */`. `hsd->CardType` is never set to `MULTIMEDIA_CARD` which is defined in `stm32f4xx_hal_sd.h`, and read in `HAL_SD_WideBusOperation_Config`. I have generated a project in the Cube and changed the `Mode` of `SDIO` to `eMMC 4 bits wide`, but it doesn't seem any different to the SD version. Here is the function for reference:- /**
* @brief Enquires cards about their operating voltage and configures clock
* controls and stores SD information that will be needed in future
* in the SD handle.
* @param hsd: SD handle
* @retval SD Card error state
*/
static HAL_SD_ErrorTypedef SD_PowerON(SD_HandleTypeDef *hsd)
{
SDIO_CmdInitTypeDef sdio_cmdinitstructure;
__IO HAL_SD_ErrorTypedef errorstate = SD_OK;
uint32_t response = 0, count = 0, validvoltage = 0;
uint32_t sdtype = SD_STD_CAPACITY;
/* Power ON Sequence -------------------------------------------------------*/
/* Disable SDIO Clock */
__HAL_SD_SDIO_DISABLE();
/* Set Power State to ON */
SDIO_PowerState_ON(hsd->Instance);
/* 1ms: required power up waiting time before starting the SD initialization
sequence */
HAL_Delay(1);
/* Enable SDIO Clock */
__HAL_SD_SDIO_ENABLE();
/* CMD0: GO_IDLE_STATE -----------------------------------------------------*/
/* No CMD response required */
sdio_cmdinitstructure.Argument = 0;
sdio_cmdinitstructure.CmdIndex = SD_CMD_GO_IDLE_STATE;
sdio_cmdinitstructure.Response = SDIO_RESPONSE_NO;
sdio_cmdinitstructure.WaitForInterrupt = SDIO_WAIT_NO;
sdio_cmdinitstructure.CPSM = SDIO_CPSM_ENABLE;
SDIO_SendCommand(hsd->Instance, &sdio_cmdinitstructure);
/* Check for error conditions */
errorstate = SD_CmdError(hsd);
if(errorstate != SD_OK)
{
/* CMD Response Timeout (wait for CMDSENT flag) */
return errorstate;
}
/* CMD8: SEND_IF_COND ------------------------------------------------------*/
/* Send CMD8 to verify SD card interface operating condition */
/* Argument: - [31:12]: Reserved (shall be set to '0')
- [11:8]: Supply Voltage (VHS) 0x1 (Range: 2.7-3.6 V)
- [7:0]: Check Pattern (recommended 0xAA) */
/* CMD Response: R7 */
sdio_cmdinitstructure.Argument = SD_CHECK_PATTERN;
sdio_cmdinitstructure.CmdIndex = SD_SDIO_SEND_IF_COND;
sdio_cmdinitstructure.Response = SDIO_RESPONSE_SHORT;
SDIO_SendCommand(hsd->Instance, &sdio_cmdinitstructure);
/* Check for error conditions */
errorstate = SD_CmdResp7Error(hsd);
if (errorstate == SD_OK)
{
/* SD Card 2.0 */
hsd->CardType = STD_CAPACITY_SD_CARD_V2_0;
sdtype = SD_HIGH_CAPACITY;
}
/* Send CMD55 */
sdio_cmdinitstructure.Argument = 0;
sdio_cmdinitstructure.CmdIndex = SD_CMD_APP_CMD;
SDIO_SendCommand(hsd->Instance, &sdio_cmdinitstructure);
/* Check for error conditions */
errorstate = SD_CmdResp1Error(hsd, SD_CMD_APP_CMD);
/* If errorstate is Command Timeout, it is a MMC card */
/* If errorstate is SD_OK it is a SD card: SD card 2.0 (voltage range mismatch)
or SD card 1.x */
if(errorstate == SD_OK)
{
/* SD CARD */
/* Send ACMD41 SD_APP_OP_COND with Argument 0x80100000 */
while((!validvoltage) && (count <
SD_MAX_VOLT_TRIAL
))
{
/* SEND CMD55 APP_CMD with RCA as 0 */
sdio_cmdinitstructure.Argument
=
0
;
sdio_cmdinitstructure.CmdIndex
=
SD_CMD_APP_CMD
;
sdio_cmdinitstructure.Response
=
SDIO_RESPONSE_SHORT
;
sdio_cmdinitstructure.WaitForInterrupt
=
SDIO_WAIT_NO
;
sdio_cmdinitstructure.CPSM
=
SDIO_CPSM_ENABLE
;
SDIO_SendCommand(hsd->Instance, &sdio_cmdinitstructure);
/* Check for error conditions */
errorstate = SD_CmdResp1Error(hsd, SD_CMD_APP_CMD);
if(errorstate != SD_OK)
{
return errorstate;
}
/* Send CMD41 */
sdio_cmdinitstructure.Argument = SD_VOLTAGE_WINDOW_SD | sdtype;
sdio_cmdinitstructure.CmdIndex = SD_CMD_SD_APP_OP_COND;
sdio_cmdinitstructure.Response = SDIO_RESPONSE_SHORT;
sdio_cmdinitstructure.WaitForInterrupt = SDIO_WAIT_NO;
sdio_cmdinitstructure.CPSM = SDIO_CPSM_ENABLE;
SDIO_SendCommand(hsd->Instance, &sdio_cmdinitstructure);
/* Check for error conditions */
errorstate = SD_CmdResp3Error(hsd);
if(errorstate != SD_OK)
{
return errorstate;
}
/* Get command response */
response = SDIO_GetResponse(SDIO_RESP1);
/* Get operating voltage*/
validvoltage = (((response >> 31) == 1) ? 1 : 0);
count++;
}
if(count >= SD_MAX_VOLT_TRIAL)
{
errorstate = SD_INVALID_VOLTRANGE;
return errorstate;
}
if((response & SD_HIGH_CAPACITY) == SD_HIGH_CAPACITY) /* (response &= SD_HIGH_CAPACITY) */
{
hsd->CardType = HIGH_CAPACITY_SD_CARD;
}
} /* else MMC Card */
return errorstate;
}