STM32F4xx & eMMC

dmwarnke · ‎2012-09-21

Posted on September 21, 2012 at 21:11

Hello all,

I have a problem I hope you can help out with. I have grabbed the sample code for writing to an SD card and am modifying it to write to an eMMC chip.

In the SD_PowerON() function the original code does a CMD0,CMD8,CMD55 sequence. For the eMMC the startup should be CMD0,CMD1 to get the chip in a usable mode.

The problem I'm having is that the CMD0 seems to be going out just fine and when it tries to do the CMD1 I get a CTIMEOUT flag in the SDIO_STA register. What am I doing wrong? Here is the power on code I've written.

SD_Error SD_PowerON(void)

{

__IO SD_Error errorstatus = SD_OK;

uint32_t response = 0, count = 0, validvoltage = 0;

uint32_t SDType = SD_STD_CAPACITY;

/*!< Power ON Sequence -----------------------------------------------------*/

/*!< Configure the SDIO peripheral */

/*!< SDIO_CK = SDIOCLK / (SDIO_INIT_CLK_DIV + 2) */

/*!< on STM32F4xx devices, SDIOCLK is fixed to 48MHz */

/*!< SDIO_CK for initialization should not exceed 400 KHz */

SDIO_InitStructure.SDIO_ClockDiv = SDIO_INIT_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);

/*!< Set Power State to ON */

SDIO_SetPowerState(SDIO_PowerState_ON);

/*!< Enable SDIO Clock */

SDIO_ClockCmd(ENABLE);

/*!< CMD0: GO_IDLE_STATE ---------------------------------------------------*/

/*!< No CMD response required */

SDIO_CmdInitStructure.SDIO_Argument = 0x0;

SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_GO_IDLE_STATE;

SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_No;

SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;

SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;

SDIO_SendCommand(&SDIO_CmdInitStructure);

errorstatus = CmdError();

if (errorstatus != SD_OK)

{

/*!< CMD Response TimeOut (wait for CMDSENT flag) */

return(errorstatus);

}

/*!< CMD1: SEND_OP_COND ----------------------------------------------------*/

/*!< Send CMD1 to receive the contents of the Operating Conditions Register */

/*!< Argument: - [31:31]: 0xxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

- [30:29]: x10x xxxx xxxx xxxx xxxx xxxx xxxx xxxx

- [28:24]: xxx0 0000 xxxx xxxx xxxx xxxx xxxx xxxx

- [23:15]: xxxx xxxx 1111 1111 1xxx xxxx xxxx xxxx

- [14:8]: xxxx xxxx xxxx xxxx x000 0000 xxxx xxxx

- [7:7]: xxxx xxxx xxxx xxxx xxxx xxxx 1xxx xxxx

- [6:0]: xxxx xxxx xxxx xxxx xxxx xxxx x000 0000 */

/*!< CMD Response: R3 */

SDIO_CmdInitStructure.SDIO_Argument = 0x40FF8080;

SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SEND_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)

{

CardType = SDIO_STD_CAPACITY_SD_CARD_V2_0; /*!< SD Card 2.0 */

SDType = SD_HIGH_CAPACITY;

}

else

{

/*!< CMD55 */

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);

}

/*!< CMD55 */

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 is Command TimeOut, it is a MMC card */

/*!< If errorstatus is SD_OK it is a SD card: SD card 2.0 (voltage range mismatch)

or SD card 1.x */

if (errorstatus == 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.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++;

}

if (count >= SD_MAX_VOLT_TRIAL)

{

errorstatus = SD_INVALID_VOLTRANGE;

return(errorstatus);

}

if (response &= SD_HIGH_CAPACITY)

{

CardType = SDIO_HIGH_CAPACITY_SD_CARD;

}

}/*!< else MMC Card */

return(errorstatus);

}

#emmc-stm32f4xx

franck · ‎2015-01-08

Posted on January 08, 2015 at 17:58

Hi,

I know it's an old post but I have the same problem _now_ 🙂

Did you find a solution to solve this ?

Franck.