📄 +
字号:
errorstatus = SD_EnableWideBusOperation(SDIO_BusWide_4b); //开启4bits模式
}
return(errorstatus);
}
/**
* @brief Gets the cuurent sd card data transfer status.
* @param None
* @retval SDTransferState: Data Transfer state.
* This value can be:
* - SD_TRANSFER_OK: No data transfer is acting
* - SD_TRANSFER_BUSY: Data transfer is acting
*/
SDTransferState SD_GetStatus(void)
{
SDCardState cardstate = SD_CARD_TRANSFER;
cardstate = SD_GetState();
if (cardstate == SD_CARD_TRANSFER)
{
return(SD_TRANSFER_OK);
}
else if(cardstate == SD_CARD_ERROR)
{
return (SD_TRANSFER_ERROR);
}
else
{
return(SD_TRANSFER_BUSY);
}
}
/**
* @brief Returns the current card's state.
* @param None
* @retval SDCardState: SD Card Error or SD Card Current State.
*/
SDCardState SD_GetState(void)
{
uint32_t resp1 = 0;
if (SD_SendStatus(&resp1) != SD_OK)
{
return SD_CARD_ERROR;
}
else
{
return (SDCardState)((resp1 >> 9) & 0x0F);
}
}
/*
* 函数名：SD_PowerON
* 描述 ：确保SD卡的工作电压和配置控制时钟
* 输入 ：无
* 输出 ：-SD_Error SD卡错误代码
* 成功时则为 SD_OK
* 调用 ：在 SD_Init() 调用
*/
SD_Error SD_PowerON(void)
{
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 */
/*!< SDIOCLK = HCLK, SDIO_CK = HCLK/(2 + SDIO_INIT_CLK_DIV) */
/*!< on STM32F2xx devices, SDIOCLK is fixed to 48MHz */
/*!< SDIO_CK for initialization should not exceed 400 KHz */
/*初始化时的时钟不能大于400KHz*/
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; //不使用bypass模式，直接用HCLK进行分频得到SDIO_CK
SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable; // 空闲时不关闭时钟电源
SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_1b; //1位数据线
SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;//硬件流
SDIO_Init(&SDIO_InitStructure);
/*!< Set Power State to ON */
SDIO_SetPowerState(SDIO_PowerState_ON);
/*!< Enable SDIO Clock */
SDIO_ClockCmd(ENABLE);
/*下面发送一系列命令,开始卡识别流程*/
/*!< CMD0: GO_IDLE_STATE ---------------------------------------------------*/
/*!< No CMD response required */
SDIO_CmdInitStructure.SDIO_Argument = 0x0;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_GO_IDLE_STATE; //cmd0
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_No; //无响应
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable; //则CPSM在开始发送命令之前等待数据传输结束。
SDIO_SendCommand(&SDIO_CmdInitStructure); //写命令进命令寄存器
errorstatus = CmdError();//检测是否正确接收到cmd0
if (errorstatus != SD_OK) //命令发送出错，返回
{
/*!< CMD Response TimeOut (wait for CMDSENT flag) */
return(errorstatus);
}
/*!< 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.SDIO_Argument = SD_CHECK_PATTERN; //接收到命令sd会返回这个参数
SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_IF_COND; //cmd8
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short; //r7
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No; //关闭等待中断
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);
/*检查是否接收到命令*/
errorstatus = CmdResp7Error();
if (errorstatus == SD_OK) //有响应则card遵循sd协议2.0版本
{
CardType = SDIO_STD_CAPACITY_SD_CARD_V2_0; /*!< SD Card 2.0 ，先把它定义会sdsc类型的卡*/
SDType = SD_HIGH_CAPACITY; //这个变量用作acmd41的参数，用来询问是sdsc卡还是sdhc卡
}
else //无响应，说明是1.x的或mmc的卡
{
/*!< 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 */ //为什么在else里和else外面都要发送CMD55?
//发送cmd55，用于检测是sd卡还是mmc卡，或是不支持的卡
SDIO_CmdInitStructure.SDIO_Argument = 0x00;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_APP_CMD;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short; //r1
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);
errorstatus = CmdResp1Error(SD_CMD_APP_CMD); //是否响应，没响应的是mmc或不支持的卡
/*!< 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) //响应了cmd55，是sd卡，可能为1.x,可能为2.0
{
/*下面开始循环地发送sdio支持的电压范围，循环一定次数*/
/*!< SD CARD */
/*!< Send ACMD41 SD_APP_OP_COND with Argument 0x80100000 */
while ((!validvoltage) && (count < SD_MAX_VOLT_TRIAL))
{
//因为下面要用到ACMD41，是ACMD命令，在发送ACMD命令前都要先向卡发送CMD55
/*!< SEND CMD55 APP_CMD with RCA as 0 */
SDIO_CmdInitStructure.SDIO_Argument = 0x00;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_APP_CMD; //CMD55
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); //检测响应
if (errorstatus != SD_OK)
{
return(errorstatus);//没响应CMD55，返回
}
//acmd41，命令参数由支持的电压范围及HCS位组成，HCS位置一来区分卡是SDSc还是sdhc
SDIO_CmdInitStructure.SDIO_Argument = SD_VOLTAGE_WINDOW_SD | SDType; //参数为主机可供电压范围及hcs位
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SD_APP_OP_COND;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short; //r3
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);
errorstatus = CmdResp3Error(); //检测是否正确接收到数据
if (errorstatus != SD_OK)
{
return(errorstatus); //没正确接收到acmd41，出错，返回
}
/*若卡需求电压在SDIO的供电电压范围内，会自动上电并标志pwr_up位*/
response = SDIO_GetResponse(SDIO_RESP1); //读取卡寄存器，卡状态
validvoltage = (((response >> 31) == 1) ? 1 : 0); //读取卡的ocr寄存器的pwr_up位，看是否已工作在正常电压
count++; //计算循环次数
}
if (count >= SD_MAX_VOLT_TRIAL) //循环检测超过一定次数还没上电
{
errorstatus = SD_INVALID_VOLTRANGE; //SDIO不支持card的供电电压
return(errorstatus);
}
/*检查卡返回信息中的HCS位*/
if (response &= SD_HIGH_CAPACITY) //判断ocr中的ccs位 ，如果是sdsc卡则不执行下面的语句
{
CardType = SDIO_HIGH_CAPACITY_SD_CARD; //把卡类型从初始化的sdsc型改为sdhc型
}
}/*!< else MMC Card */
return(errorstatus);
}
/*
* 函数名：SD_PowerOFF
* 描述 ：关掉SDIO的输出信号
* 输入 ：无
* 输出 ：-SD_Error SD卡错误代码
* 成功时则为 SD_OK
* 调用 ：外部调用
*/
SD_Error SD_PowerOFF(void)
{
SD_Error errorstatus = SD_OK;
/*!< Set Power State to OFF */
SDIO_SetPowerState(SDIO_PowerState_OFF);
return(errorstatus);
}
/*
* 函数名：SD_InitializeCards
* 描述 ：初始化所有的卡或者单个卡进入就绪状态
* 输入 ：无
* 输出 ：-SD_Error SD卡错误代码
* 成功时则为 SD_OK
* 调用 ：在 SD_Init() 调用，在调用power_on（）上电卡识别完毕后，调用此函数进行卡初始化
*/
SD_Error SD_InitializeCards(void)
{
SD_Error errorstatus = SD_OK;
uint16_t rca = 0x01;
if (SDIO_GetPowerState() == SDIO_PowerState_OFF)
{
errorstatus = SD_REQUEST_NOT_APPLICABLE;
return(errorstatus);
}
if (SDIO_SECURE_DIGITAL_IO_CARD != CardType)//判断卡的类型
{
/*!< Send CMD2 ALL_SEND_CID */
SDIO_CmdInitStructure.SDIO_Argument = 0x0;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_ALL_SEND_CID;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Long;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);
errorstatus = CmdResp2Error();
if (SD_OK != errorstatus)
{
return(errorstatus);
}
CID_Tab[0] = SDIO_GetResponse(SDIO_RESP1);
CID_Tab[1] = SDIO_GetResponse(SDIO_RESP2);
CID_Tab[2] = SDIO_GetResponse(SDIO_RESP3);
CID_Tab[3] = SDIO_GetResponse(SDIO_RESP4);
}
/*下面开始SD卡初始化流程*/
if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == CardType) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == CardType) || (SDIO_SECURE_DIGITAL_IO_COMBO_CARD == CardType)
|| (SDIO_HIGH_CAPACITY_SD_CARD == CardType)) //使用的是2.0的卡
{
/*!< Send CMD3 SET_REL_ADDR with argument 0 */
/*!< SD Card publishes its RCA. */
SDIO_CmdInitStructure.SDIO_Argument = 0x00;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SET_REL_ADDR; //cmd3
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short; //r6
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);
errorstatus = CmdResp6Error(SD_CMD_SET_REL_ADDR, &rca); //把接收到的卡相对地址存起来。
if (SD_OK != errorstatus)
{
return(errorstatus);
}
}
if (SDIO_SECURE_DIGITAL_IO_CARD != CardType)
{
RCA = rca;
/*!< Send CMD9 SEND_CSD with argument as card's RCA */
SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)(rca << 16);
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_SEND_CSD;
SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Long;
SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
SDIO_SendCommand(&SDIO_CmdInitStructure);
errorstatus = CmdResp2Error();
if (SD_OK != errorstatus)
{
return(errorstatus);
}
CSD_Tab[0] = SDIO_GetResponse(SDIO_RESP1);
CSD_Tab[1] = SDIO_GetResponse(SDIO_RESP2);
CSD_Tab[2] = SDIO_GetResponse(SDIO_RESP3);
CSD_Tab[3] = SDIO_GetResponse(SDIO_RESP4);
}
errorstatus = SD_OK; /*!< All cards get intialized */
return(errorstatus);
}
/*
* 函数名：SD_GetCardInfo
* 描述 ：获取SD卡的具体信息
* 输入 ：-cardinfo 指向SD_CardInfo结构体的指针
* 这个结构里面包含了SD卡的具体信息
* 输出 ：-SD_Error SD卡错误代码
* 成功时则为 SD_OK
* 调用 ：外部调用
*/
SD_Error SD_GetCardInfo(SD_CardInfo *cardinfo)
{
SD_Error errorstatus = SD_OK;
uint8_t tmp = 0;
cardinfo->CardType = (uint8_t)CardType;
cardinfo->RCA = (uint16_t)RCA;
/*!< Byte 0 */
tmp = (uint8_t)((CSD_Tab[0] & 0xFF000000) >> 24);
cardinfo->SD_csd.CSDStruct = (tmp & 0xC0) >> 6;
cardinfo->SD_csd.SysSpecVersion = (tmp & 0x3C) >> 2;
cardinfo->SD_csd.Reserved1 = tmp & 0x03;
/*!< Byte 1 */
tmp = (uint8_t)((CSD_Tab[0] & 0x00FF0000) >> 16);
cardinfo->SD_csd.TAAC = tmp;
/*!< Byte 2 */
tmp = (uint8_t)((CSD_Tab[0] & 0x0000FF00) >> 8);
cardinfo->SD_csd.NSAC = tmp;
/*!< Byte 3 */
tmp = (uint8_t)(CSD_Tab[0] & 0x000000FF);
cardinfo->SD_csd.MaxBusClkFrec = tmp;
/*!< Byte 4 */
tmp = (uint8_t)((CSD_Tab[1] & 0xFF000000) >> 24);
cardinfo->SD_csd.CardComdClasses = tmp << 4;
/*!< Byte 5 */
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