STM32F103显示SD卡里面的图片源码

【实例简介】

【实例截图】

【核心代码】

SD_Error SD_Init(void)

{
  SD_Error errorstatus = SD_OK;

  {
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  
  GPIO_ResetBits(GPIOB, GPIO_Pin_5) ;
  }
  
  /* Configure SDIO interface GPIO */
  GPIO_Configuration();

  /* Enable the SDIO AHB Clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_SDIO, ENABLE);

  /* Enable the DMA2 Clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);

  SDIO_DeInit();

  errorstatus = SD_PowerON();

  if (errorstatus != SD_OK)
  {
    /* CMD Response TimeOut (wait for CMDSENT flag) */
    return(errorstatus);
  }

  errorstatus = SD_InitializeCards();

  if (errorstatus != SD_OK)
  {
    /* CMD Response TimeOut (wait for CMDSENT flag) */
    return(errorstatus);
  }

  /* Configure the SDIO peripheral */
  /* HCLK = 72 MHz, SDIOCLK = 72 MHz, SDIO_CK = HCLK/(2 1) = 24 MHz */  
  SDIO_InitStructure.SDIO_ClockDiv = SDIO_TRANSFER_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);

  return(errorstatus);
}
SD_Error SD_PowerON(void)
{
  SD_Error errorstatus = SD_OK;
  u32 response = 0, count = 0;
  bool validvoltage = FALSE;
  u32 SDType = SD_STD_CAPACITY;

  /* Power ON Sequence -------------------------------------------------------*/
  /* Configure the SDIO peripheral */
  SDIO_InitStructure.SDIO_ClockDiv = SDIO_INIT_CLK_DIV; /* HCLK = 72MHz, SDIOCLK = 72MHz, SDIO_CK = HCLK/(178 2) = 400 KHz */
  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 = SDIO_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);
  }

  /* CMD8: SEND_IF_COND ----------获取卡SD版本信息参数CMD8----------------------------------------------*/
  /* 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.SDIO_Argument = SD_CHECK_PATTERN;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_IF_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 = CmdResp7Error();

  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 = SDIO_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(SDIO_APP_CMD);
  }
  /* CMD55 */
  SDIO_CmdInitStructure.SDIO_Argument = 0x00;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_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(SDIO_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 = SDIO_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(SDIO_APP_CMD);

      if (errorstatus != SD_OK)
      {
        return(errorstatus);
      }
      SDIO_CmdInitStructure.SDIO_Argument = SD_VOLTAGE_WINDOW_SD | SDType;
      SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_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 = (bool) (((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);
}