SWM320_sdio.c

/******************************************************************************************************************************************
* 文件名称: SWM320_sdio.c
* 功能说明: SWM320单片机的SDIO接口驱动库
* 技术支持: http://www.synwit.com.cn/e/tool/gbook/?bid=1
* 注意事项: 为了通用性、兼容性、易用性，只支持以512字节为单位的读写
* 版本日期: V1.1.0      2017年10月25日
* 升级记录:
*
*
*******************************************************************************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION
* REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, SYNWIT SHALL NOT BE HELD LIABLE
* FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
* OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONN-
* -ECTION WITH THEIR PRODUCTS.
*
* COPYRIGHT 2012 Synwit Technology
*******************************************************************************************************************************************/
#include "SWM320.h"
#include "SWM320_sdio.h"


SD_CardInfo SD_cardInfo;

/******************************************************************************************************************************************
* 函数名称: SDIO_Init()
* 功能说明: SDIO读写SD卡初始化，初始化成高速4线模式、读写以512字节大小进行
* 输    入: 无
* 输    出: 无
* 注意事项: 无
******************************************************************************************************************************************/
uint32_t SDIO_Init(void)
{
    uint32_t resp, resps[4];

    SYS->CLKDIV &= ~SYS_CLKDIV_SDIO_Msk;
    if (SystemCoreClock > 80000000)     //SDIO时钟需要小于52MHz
        SYS->CLKDIV |= (2 << SYS_CLKDIV_SDIO_Pos);  //SDCLK = SYSCLK / 4
    else
        SYS->CLKDIV |= (1 << SYS_CLKDIV_SDIO_Pos);  //SDCLK = SYSCLK / 2

    SYS->CLKEN |= (0x01 << SYS_CLKEN_SDIO_Pos);

    SDIO->CR2 = (1 << SDIO_CR2_RSTALL_Pos);

    SDIO->CR1 = (1 << SDIO_CR1_CDSRC_Pos) |
                (0 << SDIO_CR1_8BIT_Pos)  |
                (0 << SDIO_CR1_4BIT_Pos)  |
                (1 << SDIO_CR1_PWRON_Pos) |
                (7 << SDIO_CR1_VOLT_Pos);

    SDIO->CR2 = (1 << SDIO_CR2_CLKEN_Pos) |
                (1 << SDIO_CR2_SDCLKEN_Pos) |
                (calcSDCLKDiv(SD_CLK_400KHz) << SDIO_CR2_SDCLKDIV_Pos) |
                (0xC << SDIO_CR2_TIMEOUT_Pos);

    while ((SDIO->CR2 & SDIO_CR2_CLKRDY_Msk) == 0);

    SDIO->IE = 0xFFFF01FF;
    SDIO->IM = 0x00FF00FF;

    SDIO_SendCmd(SD_CMD_GO_IDLE_STATE, 0x00, SD_RESP_NO, 0, 0, 0);          //CMD0: GO_IDLE_STATE


    SDIO_SendCmd(SD_CMD_SEND_IF_COND, 0x1AA, SD_RESP_32b, &resp, 0, 0);     //CMD8: SEND_IF_COND, 检测工作电压、检测是否支持SD 2.0

    if (resp == 0x1AA) SD_cardInfo.CardType = SDIO_STD_CAPACITY_SD_CARD_V2_0;
    else              SD_cardInfo.CardType = SDIO_STD_CAPACITY_SD_CARD_V1_1;


    do                                                                      //ACMD41: SD_CMD_SD_APP_OP_COND
    {
        SDIO_SendCmd(SD_CMD_APP_CMD, 0x00, SD_RESP_32b, &resp, 0, 0);

        if (resp != 0x120) return SD_RES_ERR;   //不是SD卡，可能是MMC卡

        if (SD_cardInfo.CardType == SDIO_STD_CAPACITY_SD_CARD_V2_0)
            SDIO_SendCmd(SD_CMD_SD_APP_OP_COND, 0x80100000 | 0x40000000, SD_RESP_32b, &resp, 0, 0);
        else
            SDIO_SendCmd(SD_CMD_SD_APP_OP_COND, 0x80100000 | 0x00000000, SD_RESP_32b, &resp, 0, 0);
    }
    while (((resp >> 31) & 0x01) == 0);         //上电没完成时resp[31] == 0

    if (((resp >> 30) & 0x01) == 1) SD_cardInfo.CardType = SDIO_HIGH_CAPACITY_SD_CARD;


    SDIO_SendCmd(SD_CMD_ALL_SEND_CID, 0x00, SD_RESP_128b, resps, 0, 0);     //CMD2: SD_CMD_ALL_SEND_CID，获取CID

    parseCID(resps);


    SDIO_SendCmd(SD_CMD_SET_REL_ADDR, 0x00, SD_RESP_32b, &resp, 0, 0);      //CMD3: SD_CMD_SET_REL_ADDR，设置RCA

    SD_cardInfo.RCA = resp >> 16;


    SDIO_SendCmd(SD_CMD_SEND_CSD, SD_cardInfo.RCA << 16, SD_RESP_128b, resps, 0, 0);    //CMD9: SD_CMD_SEND_CSD，获取CSD

    parseCSD(resps);

    if (SD_cardInfo.CardBlockSize < 0x200) return SD_RES_ERR;   //本驱动只支持以512字节为单位的读写，所以最大读写单位必须不小于512


    SDIO->CR2 &= ~(SDIO_CR2_SDCLKEN_Msk | SDIO_CR2_SDCLKDIV_Msk);
    SDIO->CR2 |= (1 << SDIO_CR2_SDCLKEN_Pos) |
                 (calcSDCLKDiv(SD_CLK_20MHz) << SDIO_CR2_SDCLKDIV_Pos);     //初始化完成，SDCLK切换到高速


    SDIO_SendCmd(SD_CMD_SEL_DESEL_CARD, SD_cardInfo.RCA << 16, SD_RESP_32b_busy, &resp, 0, 0);  //CMD7: 选中卡，从Standy模式进入Transfer模式


    SDIO_SendCmd(SD_CMD_APP_CMD, SD_cardInfo.RCA << 16, SD_RESP_32b, &resp, 0, 0);

    SDIO_SendCmd(SD_CMD_APP_SD_SET_BUSWIDTH, SD_BUSWIDTH_4b, SD_RESP_32b, &resp, 0, 0);     //切换成4位总线模式

    SDIO->CR1 |= (1 << SDIO_CR1_4BIT_Pos);


    SDIO_SendCmd(SD_CMD_SET_BLOCKLEN, 512, SD_RESP_32b, &resp, 0, 0);       //固定块大小位512字节

    SDIO->BLK = 512;

    return SD_RES_OK;
}

/******************************************************************************************************************************************
* 函数名称: SDIO_BlockWrite()
* 功能说明: 向SD卡写入数据
* 输    入: uint32_t block_addr     SD卡块地址，每块512字节
*           uint32_t buff[]         要写入的数据
* 输    出: 无
* 注意事项: 无
******************************************************************************************************************************************/
void SDIO_BlockWrite(uint32_t block_addr, uint32_t buff[])
{
    uint32_t i, resp, addr;

    if (SD_cardInfo.CardType == SDIO_HIGH_CAPACITY_SD_CARD)  addr = block_addr;
    else                                                    addr = block_addr * 512;

    SDIO_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, addr, SD_RESP_32b, &resp, 1, 0);

    while ((SDIO->IF & SDIO_IF_BUFWRRDY_Msk) == 0);
    SDIO->IF = SDIO_IF_BUFWRRDY_Msk;

    for (i = 0; i < 512 / 4; i++) SDIO->DATA = buff[i];

    SDIO->IF = SDIO_IF_TRXDONE_Msk;     //?? 这个必须有
    while ((SDIO->IF & SDIO_IF_TRXDONE_Msk) == 0);
    SDIO->IF = SDIO_IF_TRXDONE_Msk;
}

/******************************************************************************************************************************************
* 函数名称: SDIO_BlockRead()
* 功能说明: 从SD卡读出数据
* 输    入: uint32_t block_addr     SD卡块地址，每块512字节
*           uint32_t buff[]         读出的数据
* 输    出: 无
* 注意事项: 无
******************************************************************************************************************************************/
void SDIO_BlockRead(uint32_t block_addr, uint32_t buff[])
{
    uint32_t i, resp, addr;

    if (SD_cardInfo.CardType == SDIO_HIGH_CAPACITY_SD_CARD)  addr = block_addr;
    else                                                    addr = block_addr * 512;

    SDIO_SendCmd(SD_CMD_READ_SINGLE_BLOCK, addr, SD_RESP_32b, &resp, 1, 1);

    while ((SDIO->IF & SDIO_IF_BUFRDRDY_Msk) == 0);
    SDIO->IF = SDIO_IF_BUFRDRDY_Msk;

    for (i = 0; i < 512 / 4; i++) buff[i] = SDIO->DATA;

    while ((SDIO->IF & SDIO_IF_TRXDONE_Msk) == 0);
    SDIO->IF = SDIO_IF_TRXDONE_Msk;
}

/******************************************************************************************************************************************
* 函数名称: SDIO_SendCmd()
* 功能说明: SDIO向SD卡发送命令
* 输    入: uint32_t cmd                命令索引
*           uint32_t arg                命令参数
*           uint32_t resp_type          响应类型，取值SD_RESP_NO、SD_RESP_32b、SD_RESP_128b、SD_RESP_32b_busy
*           uint32_t *resp_data         响应内容
*           uint32_t have_data          是否有数据传输
*           uint32_t data_read          1 读SD卡    0 写SD卡
* 输    出: 无
* 注意事项: 无
******************************************************************************************************************************************/
void SDIO_SendCmd(uint32_t cmd, uint32_t arg, uint32_t resp_type, uint32_t *resp_data, uint32_t have_data, uint32_t data_read)
{
    SDIO->ARG = arg;
    SDIO->CMD = (cmd << SDIO_CMD_CMDINDX_Pos) |
                (0   << SDIO_CMD_CMDTYPE_Pos) |
                (have_data << SDIO_CMD_HAVEDATA_Pos) |
                (0  << SDIO_CMD_IDXCHECK_Pos) |
                (0  << SDIO_CMD_CRCCHECK_Pos) |
                (resp_type << SDIO_CMD_RESPTYPE_Pos) |
                (0  << SDIO_CMD_MULTBLK_Pos)  |
                (data_read << SDIO_CMD_DIRREAD_Pos)  |
                (0  << SDIO_CMD_BLKCNTEN_Pos);

    while ((SDIO->IF & SDIO_IF_CMDDONE_Msk) == 0);
    SDIO->IF = SDIO_IF_CMDDONE_Msk;

    if (resp_type == SD_RESP_32b)
    {
        resp_data[0] = SDIO->RESP[0];
    }
    else if (resp_type == SD_RESP_128b)
    {
        //寄存器中将CID/CSD[127-8]依次存放在了RESP3-0[119-0]，最低位的CRC被丢掉
        //读出数据时调整了顺序，将CID/CSD[127-8]存放在resp_data0-3[127-8]，最低8位填充0x00
        resp_data[0] = (SDIO->RESP[3] << 8) + ((SDIO->RESP[2] >> 24) & 0xFF);
        resp_data[1] = (SDIO->RESP[2] << 8) + ((SDIO->RESP[1] >> 24) & 0xFF);
        resp_data[2] = (SDIO->RESP[1] << 8) + ((SDIO->RESP[0] >> 24) & 0xFF);
        resp_data[3] = (SDIO->RESP[0] << 8) + 0x00;
    }
}


void parseCID(uint32_t CID_Tab[4])
{
    uint8_t tmp = 0;

    /*!< Byte 0 */
    tmp = (uint8_t)((CID_Tab[0] & 0xFF000000) >> 24);
    SD_cardInfo.SD_cid.ManufacturerID = tmp;

    /*!< Byte 1 */
    tmp = (uint8_t)((CID_Tab[0] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_cid.OEM_AppliID = tmp << 8;

    /*!< Byte 2 */
    tmp = (uint8_t)((CID_Tab[0] & 0x000000FF00) >> 8);
    SD_cardInfo.SD_cid.OEM_AppliID |= tmp;

    /*!< Byte 3 */
    tmp = (uint8_t)(CID_Tab[0] & 0x000000FF);
    SD_cardInfo.SD_cid.ProdName1 = tmp << 24;

    /*!< Byte 4 */
    tmp = (uint8_t)((CID_Tab[1] & 0xFF000000) >> 24);
    SD_cardInfo.SD_cid.ProdName1 |= tmp << 16;

    /*!< Byte 5 */
    tmp = (uint8_t)((CID_Tab[1] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_cid.ProdName1 |= tmp << 8;

    /*!< Byte 6 */
    tmp = (uint8_t)((CID_Tab[1] & 0x0000FF00) >> 8);
    SD_cardInfo.SD_cid.ProdName1 |= tmp;

    /*!< Byte 7 */
    tmp = (uint8_t)(CID_Tab[1] & 0x000000FF);
    SD_cardInfo.SD_cid.ProdName2 = tmp;

    /*!< Byte 8 */
    tmp = (uint8_t)((CID_Tab[2] & 0xFF000000) >> 24);
    SD_cardInfo.SD_cid.ProdRev = tmp;

    /*!< Byte 9 */
    tmp = (uint8_t)((CID_Tab[2] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_cid.ProdSN = tmp << 24;

    /*!< Byte 10 */
    tmp = (uint8_t)((CID_Tab[2] & 0x0000FF00) >> 8);
    SD_cardInfo.SD_cid.ProdSN |= tmp << 16;

    /*!< Byte 11 */
    tmp = (uint8_t)(CID_Tab[2] & 0x000000FF);
    SD_cardInfo.SD_cid.ProdSN |= tmp << 8;

    /*!< Byte 12 */
    tmp = (uint8_t)((CID_Tab[3] & 0xFF000000) >> 24);
    SD_cardInfo.SD_cid.ProdSN |= tmp;

    /*!< Byte 13 */
    tmp = (uint8_t)((CID_Tab[3] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_cid.Reserved1 |= (tmp & 0xF0) >> 4;
    SD_cardInfo.SD_cid.ManufactDate = (tmp & 0x0F) << 8;

    /*!< Byte 14 */
    tmp = (uint8_t)((CID_Tab[3] & 0x0000FF00) >> 8);
    SD_cardInfo.SD_cid.ManufactDate |= tmp;
}

void parseCSD(uint32_t CSD_Tab[4])
{
    uint8_t tmp = 0;

    /*!< Byte 0 */
    tmp = (uint8_t)((CSD_Tab[0] & 0xFF000000) >> 24);
    SD_cardInfo.SD_csd.CSDStruct = (tmp & 0xC0) >> 6;
    SD_cardInfo.SD_csd.SysSpecVersion = (tmp & 0x3C) >> 2;
    SD_cardInfo.SD_csd.Reserved1 = tmp & 0x03;

    /*!< Byte 1 */
    tmp = (uint8_t)((CSD_Tab[0] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_csd.TAAC = tmp;

    /*!< Byte 2 */
    tmp = (uint8_t)((CSD_Tab[0] & 0x0000FF00) >> 8);
    SD_cardInfo.SD_csd.NSAC = tmp;

    /*!< Byte 3 */
    tmp = (uint8_t)(CSD_Tab[0] & 0x000000FF);
    SD_cardInfo.SD_csd.MaxBusClkFrec = tmp;

    /*!< Byte 4 */
    tmp = (uint8_t)((CSD_Tab[1] & 0xFF000000) >> 24);
    SD_cardInfo.SD_csd.CardComdClasses = tmp << 4;

    /*!< Byte 5 */
    tmp = (uint8_t)((CSD_Tab[1] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_csd.CardComdClasses |= (tmp & 0xF0) >> 4;
    SD_cardInfo.SD_csd.RdBlockLen = tmp & 0x0F;

    /*!< Byte 6 */
    tmp = (uint8_t)((CSD_Tab[1] & 0x0000FF00) >> 8);
    SD_cardInfo.SD_csd.PartBlockRead = (tmp & 0x80) >> 7;
    SD_cardInfo.SD_csd.WrBlockMisalign = (tmp & 0x40) >> 6;
    SD_cardInfo.SD_csd.RdBlockMisalign = (tmp & 0x20) >> 5;
    SD_cardInfo.SD_csd.DSRImpl = (tmp & 0x10) >> 4;
    SD_cardInfo.SD_csd.Reserved2 = 0; /*!< Reserved */

    if ((SD_cardInfo.CardType == SDIO_STD_CAPACITY_SD_CARD_V1_1) ||
            (SD_cardInfo.CardType == SDIO_STD_CAPACITY_SD_CARD_V2_0))
    {
        SD_cardInfo.SD_csd.DeviceSize = (tmp & 0x03) << 10;

        /*!< Byte 7 */
        tmp = (uint8_t)(CSD_Tab[1] & 0x000000FF);
        SD_cardInfo.SD_csd.DeviceSize |= (tmp) << 2;

        /*!< Byte 8 */
        tmp = (uint8_t)((CSD_Tab[2] & 0xFF000000) >> 24);
        SD_cardInfo.SD_csd.DeviceSize |= (tmp & 0xC0) >> 6;

        SD_cardInfo.SD_csd.MaxRdCurrentVDDMin = (tmp & 0x38) >> 3;
        SD_cardInfo.SD_csd.MaxRdCurrentVDDMax = (tmp & 0x07);

        /*!< Byte 9 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x00FF0000) >> 16);
        SD_cardInfo.SD_csd.MaxWrCurrentVDDMin = (tmp & 0xE0) >> 5;
        SD_cardInfo.SD_csd.MaxWrCurrentVDDMax = (tmp & 0x1C) >> 2;
        SD_cardInfo.SD_csd.DeviceSizeMul = (tmp & 0x03) << 1;
        /*!< Byte 10 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x0000FF00) >> 8);
        SD_cardInfo.SD_csd.DeviceSizeMul |= (tmp & 0x80) >> 7;

        SD_cardInfo.CardCapacity = (SD_cardInfo.SD_csd.DeviceSize + 1) ;
        SD_cardInfo.CardCapacity *= (1 << (SD_cardInfo.SD_csd.DeviceSizeMul + 2));
        SD_cardInfo.CardBlockSize = 1 << (SD_cardInfo.SD_csd.RdBlockLen);
        SD_cardInfo.CardCapacity *= SD_cardInfo.CardBlockSize;
    }
    else if (SD_cardInfo.CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        /*!< Byte 7 */
        tmp = (uint8_t)(CSD_Tab[1] & 0x000000FF);
        SD_cardInfo.SD_csd.DeviceSize = (tmp & 0x3F) << 16;

        /*!< Byte 8 */
        tmp = (uint8_t)((CSD_Tab[2] & 0xFF000000) >> 24);

        SD_cardInfo.SD_csd.DeviceSize |= (tmp << 8);

        /*!< Byte 9 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x00FF0000) >> 16);

        SD_cardInfo.SD_csd.DeviceSize |= (tmp);

        /*!< Byte 10 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x0000FF00) >> 8);

        SD_cardInfo.CardCapacity = (SD_cardInfo.SD_csd.DeviceSize + 1) * 512 * 1024;
        SD_cardInfo.CardBlockSize = 512;
    }

    SD_cardInfo.SD_csd.EraseGrSize = (tmp & 0x40) >> 6;
    SD_cardInfo.SD_csd.EraseGrMul = (tmp & 0x3F) << 1;

    /*!< Byte 11 */
    tmp = (uint8_t)(CSD_Tab[2] & 0x000000FF);
    SD_cardInfo.SD_csd.EraseGrMul |= (tmp & 0x80) >> 7;
    SD_cardInfo.SD_csd.WrProtectGrSize = (tmp & 0x7F);

    /*!< Byte 12 */
    tmp = (uint8_t)((CSD_Tab[3] & 0xFF000000) >> 24);
    SD_cardInfo.SD_csd.WrProtectGrEnable = (tmp & 0x80) >> 7;
    SD_cardInfo.SD_csd.ManDeflECC = (tmp & 0x60) >> 5;
    SD_cardInfo.SD_csd.WrSpeedFact = (tmp & 0x1C) >> 2;
    SD_cardInfo.SD_csd.MaxWrBlockLen = (tmp & 0x03) << 2;

    /*!< Byte 13 */
    tmp = (uint8_t)((CSD_Tab[3] & 0x00FF0000) >> 16);
    SD_cardInfo.SD_csd.MaxWrBlockLen |= (tmp & 0xC0) >> 6;
    SD_cardInfo.SD_csd.WriteBlockPaPartial = (tmp & 0x20) >> 5;
    SD_cardInfo.SD_csd.Reserved3 = 0;
    SD_cardInfo.SD_csd.ContentProtectAppli = (tmp & 0x01);

    /*!< Byte 14 */
    tmp = (uint8_t)((CSD_Tab[3] & 0x0000FF00) >> 8);
    SD_cardInfo.SD_csd.FileFormatGrouop = (tmp & 0x80) >> 7;
    SD_cardInfo.SD_csd.CopyFlag = (tmp & 0x40) >> 6;
    SD_cardInfo.SD_csd.PermWrProtect = (tmp & 0x20) >> 5;
    SD_cardInfo.SD_csd.TempWrProtect = (tmp & 0x10) >> 4;
    SD_cardInfo.SD_csd.FileFormat = (tmp & 0x0C) >> 2;
    SD_cardInfo.SD_csd.ECC = (tmp & 0x03);
}

uint32_t calcSDCLKDiv(uint32_t freq_sel)
{
    uint32_t regdiv = 0;
    uint32_t clkdiv = 0;

    if (((SYS->CLKDIV & SYS_CLKDIV_SDIO_Msk) >> SYS_CLKDIV_SDIO_Pos) == 1)
        clkdiv = SystemCoreClock / 2 / ((freq_sel == SD_CLK_400KHz) ? 300000 : 15000000);
    else if (((SYS->CLKDIV & SYS_CLKDIV_SDIO_Msk) >> SYS_CLKDIV_SDIO_Pos) == 2)
        clkdiv = SystemCoreClock / 4 / ((freq_sel == SD_CLK_400KHz) ? 300000 : 15000000);

    if (clkdiv > 128)     regdiv = 0x80;
    else if (clkdiv > 64) regdiv = 0x40;
    else if (clkdiv > 32) regdiv = 0x20;
    else if (clkdiv > 16) regdiv = 0x10;
    else if (clkdiv >  8) regdiv = 0x08;
    else if (clkdiv >  4) regdiv = 0x04;
    else if (clkdiv >  2) regdiv = 0x02;
    else if (clkdiv >  1) regdiv = 0x01;
    else                 regdiv = 0x00;

    return regdiv;
}