STM32F4xx & eMMC

[dmwarnke]

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]

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.