STM32-SD卡SDIO
SDIO简介
STM32F4的SDIO提供 APB2 外设总线与多媒体卡 (MMC)、 SD 卡、 SDIO卡以及 CE-ATA 设备之间的接口。
特性：
● 完全兼容多媒体卡系统规范版本 4.2。卡支持三种不同数据总线模式： 1 位（默认）、4 位和 8 位
● 完全兼容先前版本的多媒体卡（向前兼容性）
● 完全兼容 SD 存储卡规范版本 2.0
● 完全兼容 SD I/O 卡规范版本 2.0： 卡支持两种不同数据总线模式： 1 位（默认）和 4 位
● 完全支持 CE-ATA 功能（完全符合 CE-ATA 数字协议版本 1.1）
● 对于 8 位模式，数据传输高达 48 MHz
● 数据和命令输出使能信号，控制外部双向驱动程序。
结构框图：
SDIO总线拓扑
总线的通信是基于命令和数据的传输。多媒体卡/SD/SD I/O 总线上的基本事务是命令/响应事务。这些类型的总线事务直接在命令或响应结构中传输其信息。此外，某些操作具有数据令牌与 SD/SDIO 存储卡的数据相互传输在数据块中执行。与 MMC 的数据相互传输在数据块或流中执行。与 CE-ATA 器件的数据相互传输在数据块中执行。
SDIO命令与响应：
SD 卡主机模块系统旨在为各种应用程序类型提供一个标准接口。在此环境中，需要有特定的客户/应用程序功能。为实现这些功能，在标准中定义了两种类型的通用命令：应用程序特定的命令 (ACMD) 和常规令 (GEN_CMD)。
- 命令格式
命令是用于启动操作的令牌。命令从主机发送到单个卡（编址命令），或发送到所有已连接的卡（ MMC V3.31 或更低版本可以使用广播命令）。命令在 CMD线上以串行方式传输。所有命令都为固定长度 48 位。命令路径以半双工模式运行，因此可以发送或者接收命令和响应。 - 响应格式
响应是一个令牌，它作为对先前接收命令的应答，从编址卡（或者，对于MMC V3.31 或更低版本，从所有已连接的卡同步）发送到主机。响应在 CMD 线上以串行方式传输。
SDIO 支持两种响应类型。两种类型均使用 CRC 错误校验：
● 48 位短响应
● 136 位长响应
code:
//SDIO相关标志位,拷贝自:stm32f4xx_sdio.h
#define SDIO_FLAG_CCRCFAIL ((uint32_t)0x00000001)
#define SDIO_FLAG_DCRCFAIL ((uint32_t)0x00000002)
#define SDIO_FLAG_CTIMEOUT ((uint32_t)0x00000004)
#define SDIO_FLAG_DTIMEOUT ((uint32_t)0x00000008)
#define SDIO_FLAG_TXUNDERR ((uint32_t)0x00000010)
#define SDIO_FLAG_RXOVERR ((uint32_t)0x00000020)
#define SDIO_FLAG_CMDREND ((uint32_t)0x00000040)
#define SDIO_FLAG_CMDSENT ((uint32_t)0x00000080)
#define SDIO_FLAG_DATAEND ((uint32_t)0x00000100)
#define SDIO_FLAG_STBITERR ((uint32_t)0x00000200)
#define SDIO_FLAG_DBCKEND ((uint32_t)0x00000400)
#define SDIO_FLAG_CMDACT ((uint32_t)0x00000800)
#define SDIO_FLAG_TXACT ((uint32_t)0x00001000)
#define SDIO_FLAG_RXACT ((uint32_t)0x00002000)
#define SDIO_FLAG_TXFIFOHE ((uint32_t)0x00004000)
#define SDIO_FLAG_RXFIFOHF ((uint32_t)0x00008000)
#define SDIO_FLAG_TXFIFOF ((uint32_t)0x00010000)
#define SDIO_FLAG_RXFIFOF ((uint32_t)0x00020000)
#define SDIO_FLAG_TXFIFOE ((uint32_t)0x00040000)
#define SDIO_FLAG_RXFIFOE ((uint32_t)0x00080000)
#define SDIO_FLAG_TXDAVL ((uint32_t)0x00100000)
#define SDIO_FLAG_RXDAVL ((uint32_t)0x00200000)
#define SDIO_FLAG_SDIOIT ((uint32_t)0x00400000)
#define SDIO_FLAG_CEATAEND ((uint32_t)0x00800000)
//用户配置区
//SDIO时钟计算公式:SDIO_CK时钟=SDIOCLK/[clkdiv+2];其中,SDIOCLK固定为48Mhz
//使用DMA模式的时候,传输速率可以到48Mhz(bypass on时),不过如果你的卡不是高速
//卡,可能也会出错,出错就请降低时钟
#define SDIO_INIT_CLK_DIV 0x76 //SDIO初始化频率，最大400Kh
#define SDIO_TRANSFER_CLK_DIV 0x00 //SDIO传输频率,该值太小可能会导致读写文件出错
//SDIO工作模式定义,通过SD_SetDeviceMode函数设置.
#define SD_POLLING_MODE 0 //查询模式,该模式下,如果读写有问题,建议增大SDIO_TRANSFER_CLK_DIV的设置.
#define SD_DMA_MODE 1 //DMA模式,该模式下,如果读写有问题,建议增大SDIO_TRANSFER_CLK_DIV的设置.
//SDIO 各种错误枚举定义
typedef enum
{
//特殊错误定义
SD_CMD_CRC_FAIL = (1), /*!< Command response received (but CRC check failed) */
SD_DATA_CRC_FAIL = (2), /*!< Data bock sent/received (CRC check Failed) */
SD_CMD_RSP_TIMEOUT = (3), /*!< Command response timeout */
SD_DATA_TIMEOUT = (4), /*!< Data time out */
SD_TX_UNDERRUN = (5), /*!< Transmit FIFO under-run */
SD_RX_OVERRUN = (6), /*!< Receive FIFO over-run */
SD_START_BIT_ERR = (7), /*!< Start bit not detected on all data signals in widE bus mode */
SD_CMD_OUT_OF_RANGE = (8), /*!< CMD's argument was out of range.*/
SD_ADDR_MISALIGNED = (9), /*!< Misaligned address */
SD_BLOCK_LEN_ERR = (10), /*!< Transferred block length is not allowed for the card or the number of transferred bytes does not match the block length */
SD_ERASE_SEQ_ERR = (11), /*!< An error in the sequence of erase command occurs.*/
SD_BAD_ERASE_PARAM = (12), /*!< An Invalid selection for erase groups */
SD_WRITE_PROT_VIOLATION = (13), /*!< Attempt to program a write protect block */
SD_LOCK_UNLOCK_FAILED = (14), /*!< Sequence or password error has been detected in unlock command or if there was an attempt to access a locked card */
SD_COM_CRC_FAILED = (15), /*!< CRC check of the previous command failed */
SD_ILLEGAL_CMD = (16), /*!< Command is not legal for the card state */
SD_CARD_ECC_FAILED = (17), /*!< Card internal ECC was applied but failed to correct the data */
SD_CC_ERROR = (18), /*!< Internal card controller error */
SD_GENERAL_UNKNOWN_ERROR = (19), /*!< General or Unknown error */
SD_STREAM_READ_UNDERRUN = (20), /*!< The card could not sustain data transfer in stream read operation. */
SD_STREAM_WRITE_OVERRUN = (21), /*!< The card could not sustain data programming in stream mode */
SD_CID_CSD_OVERWRITE = (22), /*!< CID/CSD overwrite error */
SD_WP_ERASE_SKIP = (23), /*!< only partial address space was erased */
SD_CARD_ECC_DISABLED = (24), /*!< Command has been executed without using internal ECC */
SD_ERASE_RESET = (25), /*!< Erase sequence was cleared before executing because an out of erase sequence command was received */
SD_AKE_SEQ_ERROR = (26), /*!< Error in sequence of authentication. */
SD_INVALID_VOLTRANGE = (27),
SD_ADDR_OUT_OF_RANGE = (28),
SD_SWITCH_ERROR = (29),
SD_SDIO_DISABLED = (30),
SD_SDIO_FUNCTION_BUSY = (31),
SD_SDIO_FUNCTION_FAILED = (32),
SD_SDIO_UNKNOWN_FUNCTION = (33),
//标准错误定义
SD_INTERNAL_ERROR,
SD_NOT_CONFIGURED,
SD_REQUEST_PENDING,
SD_REQUEST_NOT_APPLICABLE,
SD_INVALID_PARAMETER,
SD_UNSUPPORTED_FEATURE,
SD_UNSUPPORTED_HW,
SD_ERROR,
SD_OK = 0
} SD_Error;
//SD卡CSD寄存器数据
typedef struct
{
u8 CSDStruct; /*!< CSD structure */
u8 SysSpecVersion; /*!< System specification version */
u8 Reserved1; /*!< Reserved */
u8 TAAC; /*!< Data read access-time 1 */
u8 NSAC; /*!< Data read access-time 2 in CLK cycles */
u8 MaxBusClkFrec; /*!< Max. bus clock frequency */
u16 CardComdClasses; /*!< Card command classes */
u8 RdBlockLen; /*!< Max. read data block length */
u8 PartBlockRead; /*!< Partial blocks for read allowed */
u8 WrBlockMisalign; /*!< Write block misalignment */
u8 RdBlockMisalign; /*!< Read block misalignment */
u8 DSRImpl; /*!< DSR implemented */
u8 Reserved2; /*!< Reserved */
u32 DeviceSize; /*!< Device Size */
u8 MaxRdCurrentVDDMin; /*!< Max. read current @ VDD min */
u8 MaxRdCurrentVDDMax; /*!< Max. read current @ VDD max */
u8 MaxWrCurrentVDDMin; /*!< Max. write current @ VDD min */
u8 MaxWrCurrentVDDMax; /*!< Max. write current @ VDD max */
u8 DeviceSizeMul; /*!< Device size multiplier */
u8 EraseGrSize; /*!< Erase group size */
u8 EraseGrMul; /*!< Erase group size multiplier */
u8 WrProtectGrSize; /*!< Write protect group size */
u8 WrProtectGrEnable; /*!< Write protect group enable */
u8 ManDeflECC; /*!< Manufacturer default ECC */
u8 WrSpeedFact; /*!< Write speed factor */
u8 MaxWrBlockLen; /*!< Max. write data block length */
u8 WriteBlockPaPartial; /*!< Partial blocks for write allowed */
u8 Reserved3; /*!< Reserded */
u8 ContentProtectAppli; /*!< Content protection application */
u8 FileFormatGrouop; /*!< File format group */
u8 CopyFlag; /*!< Copy flag (OTP) */
u8 PermWrProtect; /*!< Permanent write protection */
u8 TempWrProtect; /*!< Temporary write protection */
u8 FileFormat; /*!< File Format */
u8 ECC; /*!< ECC code */
u8 CSD_CRC; /*!< CSD CRC */
u8 Reserved4; /*!< always 1*/
} SD_CSD;
//SD卡CID寄存器数据
typedef struct
{
u8 ManufacturerID; /*!< ManufacturerID */
u16 OEM_AppliID; /*!< OEM/Application ID */
u32 ProdName1; /*!< Product Name part1 */
u8 ProdName2; /*!< Product Name part2*/
u8 ProdRev; /*!< Product Revision */
u32 ProdSN; /*!< Product Serial Number */
u8 Reserved1; /*!< Reserved1 */
u16 ManufactDate; /*!< Manufacturing Date */
u8 CID_CRC; /*!< CID CRC */
u8 Reserved2; /*!< always 1 */
} SD_CID;
//SD卡状态
typedef enum
{
SD_CARD_READY = ((uint32_t)0x00000001),
SD_CARD_IDENTIFICATION = ((uint32_t)0x00000002),
SD_CARD_STANDBY = ((uint32_t)0x00000003),
SD_CARD_TRANSFER = ((uint32_t)0x00000004),
SD_CARD_SENDING = ((uint32_t)0x00000005),
SD_CARD_RECEIVING = ((uint32_t)0x00000006),
SD_CARD_PROGRAMMING = ((uint32_t)0x00000007),
SD_CARD_DISCONNECTED = ((uint32_t)0x00000008),
SD_CARD_ERROR = ((uint32_t)0x000000FF)
}SDCardState;
//SD卡信息,包括CSD,CID等数据
typedef struct
{
SD_CSD SD_csd;
SD_CID SD_cid;
long long CardCapacity; //SD卡容量,单位:字节,最大支持2^64字节大小的卡.
u32 CardBlockSize; //SD卡块大小
u16 RCA; //卡相对地址
u8 CardType; //卡类型
} SD_CardInfo;
extern SD_CardInfo SDCardInfo;//SD卡信息
//SDIO 指令集
#define SD_CMD_GO_IDLE_STATE ((u8)0)
#define SD_CMD_SEND_OP_COND ((u8)1)
#define SD_CMD_ALL_SEND_CID ((u8)2)
#define SD_CMD_SET_REL_ADDR ((u8)3) /*!< SDIO_SEND_REL_ADDR for SD Card */
#define SD_CMD_SET_DSR ((u8)4)
#define SD_CMD_SDIO_SEN_OP_COND ((u8)5)
#define SD_CMD_HS_SWITCH ((u8)6)
#define SD_CMD_SEL_DESEL_CARD ((u8)7)
#define SD_CMD_HS_SEND_EXT_CSD ((u8)8)
#define SD_CMD_SEND_CSD ((u8)9)
#define SD_CMD_SEND_CID ((u8)10)
#define SD_CMD_READ_DAT_UNTIL_STOP ((u8)11) /*!< SD Card doesn't support it */
#define SD_CMD_STOP_TRANSMISSION ((u8)12)
#define SD_CMD_SEND_STATUS ((u8)13)
#define SD_CMD_HS_BUSTEST_READ ((u8)14)
#define SD_CMD_GO_INACTIVE_STATE ((u8)15)
#define SD_CMD_SET_BLOCKLEN ((u8)16)
#define SD_CMD_READ_SINGLE_BLOCK ((u8)17)
#define SD_CMD_READ_MULT_BLOCK ((u8)18)
#define SD_CMD_HS_BUSTEST_WRITE ((u8)19)
#define SD_CMD_WRITE_DAT_UNTIL_STOP ((u8)20)
#define SD_CMD_SET_BLOCK_COUNT ((u8)23)
#define SD_CMD_WRITE_SINGLE_BLOCK ((u8)24)
#define SD_CMD_WRITE_MULT_BLOCK ((u8)25)
#define SD_CMD_PROG_CID ((u8)26)
#define SD_CMD_PROG_CSD ((u8)27)
#define SD_CMD_SET_WRITE_PROT ((u8)28)
#define SD_CMD_CLR_WRITE_PROT ((u8)29)
#define SD_CMD_SEND_WRITE_PROT ((u8)30)
#define SD_CMD_SD_ERASE_GRP_START ((u8)32) /*!< To set the address of the first write
block to be erased. (For SD card only) */
#define SD_CMD_SD_ERASE_GRP_END ((u8)33) /*!< To set the address of the last write block of the
continuous range to be erased. (For SD card only) */
#define SD_CMD_ERASE_GRP_START ((u8)35) /*!< To set the address of the first write block to be erased.
(For MMC card only spec 3.31) */
#define SD_CMD_ERASE_GRP_END ((u8)36) /*!< To set the address of the last write block of the
continuous range to be erased. (For MMC card only spec 3.31) */
#define SD_CMD_ERASE ((u8)38)
#define SD_CMD_FAST_IO ((u8)39) /*!< SD Card doesn't support it */
#define SD_CMD_GO_IRQ_STATE ((u8)40) /*!< SD Card doesn't support it */
#define SD_CMD_LOCK_UNLOCK ((u8)42)
#define SD_CMD_APP_CMD ((u8)55)
#define SD_CMD_GEN_CMD ((u8)56)
#define SD_CMD_NO_CMD ((u8)64)
/**
* @brief Following commands are SD Card Specific commands.
* SDIO_APP_CMD ：CMD55 should be sent before sending these commands.
*/
#define SD_CMD_APP_SD_SET_BUSWIDTH ((u8)6) /*!< For SD Card only */
#define SD_CMD_SD_APP_STAUS ((u8)13) /*!< For SD Card only */
#define SD_CMD_SD_APP_SEND_NUM_WRITE_BLOCKS ((u8)22) /*!< For SD Card only */
#define SD_CMD_SD_APP_OP_COND ((u8)41) /*!< For SD Card only */
#define SD_CMD_SD_APP_SET_CLR_CARD_DETECT ((u8)42) /*!< For SD Card only */
#define SD_CMD_SD_APP_SEND_SCR ((u8)51) /*!< For SD Card only */
#define SD_CMD_SDIO_RW_DIRECT ((u8)52) /*!< For SD I/O Card only */
#define SD_CMD_SDIO_RW_EXTENDED ((u8)53) /*!< For SD I/O Card only */
/**
* @brief Following commands are SD Card Specific security commands.
* SDIO_APP_CMD should be sent before sending these commands.
*/
#define SD_CMD_SD_APP_GET_MKB ((u8)43) /*!< For SD Card only */
#define SD_CMD_SD_APP_GET_MID ((u8)44) /*!< For SD Card only */
#define SD_CMD_SD_APP_SET_CER_RN1 ((u8)45) /*!< For SD Card only */
#define SD_CMD_SD_APP_GET_CER_RN2 ((u8)46) /*!< For SD Card only */
#define SD_CMD_SD_APP_SET_CER_RES2 ((u8)47) /*!< For SD Card only */
#define SD_CMD_SD_APP_GET_CER_RES1 ((u8)48) /*!< For SD Card only */
#define SD_CMD_SD_APP_SECURE_READ_MULTIPLE_BLOCK ((u8)18) /*!< For SD Card only */
#define SD_CMD_SD_APP_SECURE_WRITE_MULTIPLE_BLOCK ((u8)25) /*!< For SD Card only */
#define SD_CMD_SD_APP_SECURE_ERASE ((u8)38) /*!< For SD Card only */
#define SD_CMD_SD_APP_CHANGE_SECURE_AREA ((u8)49) /*!< For SD Card only */
#define SD_CMD_SD_APP_SECURE_WRITE_MKB ((u8)48) /*!< For SD Card only */
//支持的SD卡定义
#define SDIO_STD_CAPACITY_SD_CARD_V1_1 ((u32)0x00000000)
#define SDIO_STD_CAPACITY_SD_CARD_V2_0 ((u32)0x00000001)
#define SDIO_HIGH_CAPACITY_SD_CARD ((u32)0x00000002)
#define SDIO_MULTIMEDIA_CARD ((u32)0x00000003)
#define SDIO_SECURE_DIGITAL_IO_CARD ((u32)0x00000004)
#define SDIO_HIGH_SPEED_MULTIMEDIA_CARD ((u32)0x00000005)
#define SDIO_SECURE_DIGITAL_IO_COMBO_CARD ((u32)0x00000006)
#define SDIO_HIGH_CAPACITY_MMC_CARD ((u32)0x00000007)
//SDIO相关参数定义
#define NULL 0
#define SDIO_STATIC_FLAGS ((u32)0x000005FF)
#define SDIO_CMD0TIMEOUT ((u32)0x00010000)
#define SDIO_DATATIMEOUT ((u32)0xFFFFFFFF)
#define SDIO_FIFO_Address ((u32)0x40018080)
//Mask for errors Card Status R1 (OCR Register)
#define SD_OCR_ADDR_OUT_OF_RANGE ((u32)0x80000000)
#define SD_OCR_ADDR_MISALIGNED ((u32)0x40000000)
#define SD_OCR_BLOCK_LEN_ERR ((u32)0x20000000)
#define SD_OCR_ERASE_SEQ_ERR ((u32)0x10000000)
#define SD_OCR_BAD_ERASE_PARAM ((u32)0x08000000)
#define SD_OCR_WRITE_PROT_VIOLATION ((u32)0x04000000)
#define SD_OCR_LOCK_UNLOCK_FAILED ((u32)0x01000000)
#define SD_OCR_COM_CRC_FAILED ((u32)0x00800000)
#define SD_OCR_ILLEGAL_CMD ((u32)0x00400000)
#define SD_OCR_CARD_ECC_FAILED ((u32)0x00200000)
#define SD_OCR_CC_ERROR ((u32)0x00100000)
#define SD_OCR_GENERAL_UNKNOWN_ERROR ((u32)0x00080000)
#define SD_OCR_STREAM_READ_UNDERRUN ((u32)0x00040000)
#define SD_OCR_STREAM_WRITE_OVERRUN ((u32)0x00020000)
#define SD_OCR_CID_CSD_OVERWRIETE ((u32)0x00010000)
#define SD_OCR_WP_ERASE_SKIP ((u32)0x00008000)
#define SD_OCR_CARD_ECC_DISABLED ((u32)0x00004000)
#define SD_OCR_ERASE_RESET ((u32)0x00002000)
#define SD_OCR_AKE_SEQ_ERROR ((u32)0x00000008)
#define SD_OCR_ERRORBITS ((u32)0xFDFFE008)
//Masks for R6 Response
#define SD_R6_GENERAL_UNKNOWN_ERROR ((u32)0x00002000)
#define SD_R6_ILLEGAL_CMD ((u32)0x00004000)
#define SD_R6_COM_CRC_FAILED ((u32)0x00008000)
#define SD_VOLTAGE_WINDOW_SD ((u32)0x80100000)
#define SD_HIGH_CAPACITY ((u32)0x40000000)
#define SD_STD_CAPACITY ((u32)0x00000000)
#define SD_CHECK_PATTERN ((u32)0x000001AA)
#define SD_VOLTAGE_WINDOW_MMC ((u32)0x80FF8000)
#define SD_MAX_VOLT_TRIAL ((u32)0x0000FFFF)
#define SD_ALLZERO ((u32)0x00000000)
#define SD_WIDE_BUS_SUPPORT ((u32)0x00040000)
#define SD_SINGLE_BUS_SUPPORT ((u32)0x00010000)
#define SD_CARD_LOCKED ((u32)0x02000000)
#define SD_CARD_PROGRAMMING ((u32)0x00000007)
#define SD_CARD_RECEIVING ((u32)0x00000006)
#define SD_DATATIMEOUT ((u32)0xFFFFFFFF)
#define SD_0TO7BITS ((u32)0x000000FF)
#define SD_8TO15BITS ((u32)0x0000FF00)
#define SD_16TO23BITS ((u32)0x00FF0000)
#define SD_24TO31BITS ((u32)0xFF000000)
#define SD_MAX_DATA_LENGTH ((u32)0x01FFFFFF)
#define SD_HALFFIFO ((u32)0x00000008)
#define SD_HALFFIFOBYTES ((u32)0x00000020)
//Command Class Supported
#define SD_CCCC_LOCK_UNLOCK ((u32)0x00000080)
#define SD_CCCC_WRITE_PROT ((u32)0x00000040)
#define SD_CCCC_ERASE ((u32)0x00000020)
//CMD8指令
#define SDIO_SEND_IF_COND ((u32)0x00000008)
//相关函数定义
SD_Error SD_Init(void);
void SDIO_Clock_Set(u8 clkdiv);
SD_Error SD_PowerON(void);
SD_Error SD_PowerOFF(void);
SD_Error SD_InitializeCards(void);
SD_Error SD_GetCardInfo(SD_CardInfo *cardinfo);
SD_Error SD_EnableWideBusOperation(u32 wmode);
SD_Error SD_SetDeviceMode(u32 mode);
SD_Error SD_SelectDeselect(u32 addr);
SD_Error SD_SendStatus(uint32_t *pcardstatus);
SDCardState SD_GetState(void);
SD_Error SD_ReadBlock(u8 *buf,long long addr,u16 blksize);
SD_Error SD_ReadMultiBlocks(u8 *buf,long long addr,u16 blksize,u32 nblks);
SD_Error SD_WriteBlock(u8 *buf,long long addr, u16 blksize);
SD_Error SD_WriteMultiBlocks(u8 *buf,long long addr,u16 blksize,u32 nblks);
SD_Error SD_ProcessIRQSrc(void);
void SD_DMA_Config(u32*mbuf,u32 bufsize,u32 dir);
//void SD_DMA_Config(u32*mbuf,u32 bufsize,u8 dir);
u8 SD_ReadDisk(u8*buf,u32 sector,u8 cnt); //读SD卡,fatfs/usb调用
u8 SD_WriteDisk(u8*buf,u32 sector,u8 cnt); //写SD卡,fatfs/usb调用
/*用于sdio初始化的结构体*/
SDIO_InitTypeDef SDIO_InitStructure;
SDIO_CmdInitTypeDef SDIO_CmdInitStructure;
SDIO_DataInitTypeDef SDIO_DataInitStructure;
SD_Error CmdError(void);
SD_Error CmdResp7Error(void);
SD_Error CmdResp1Error(u8 cmd);
SD_Error CmdResp3Error(void);
SD_Error CmdResp2Error(void);
SD_Error CmdResp6Error(u8 cmd,u16*prca);
SD_Error
SDEnWideBus(u8 enx);
SD_Error IsCardProgramming(u8 *pstatus);
SD_Error FindSCR(u16 rca,u32 *pscr);
u8 convert_from_bytes_to_power_of_two(u16 NumberOfBytes);
static u8 CardType=SDIO_STD_CAPACITY_SD_CARD_V1_1; //SD卡类型（默认为1.x卡）
static u32 CSD_Tab[4],CID_Tab[4],RCA=0; //SD卡CSD,CID以及相对地址(RCA)数据
static u8 DeviceMode=SD_DMA_MODE; //工作模式,注意,工作模式必须通过SD_SetDeviceMode,后才算数.这里只是定义一个默认的模式(SD_DMA_MODE)
static u8 StopCondition=0; //是否发送停止传输标志位,DMA多块读写的时候用到
volatile SD_Error TransferError=SD_OK; //数据传输错误标志,DMA读写时使用
volatile u8 TransferEnd=0; //传输结束标志,DMA读写时使用
SD_CardInfo SDCardInfo; //SD卡信息
//SD_ReadDisk/SD_WriteDisk函数专用buf,当这两个函数的数据缓存区地址不是4字节对齐的时候,
//需要用到该数组,确保数据缓存区地址是4字节对齐的.
__align(4) u8 SDIO_DATA_BUFFER[512];
//初始化SD卡
//返回值:错误代码;(0,无错误)
SD_Error SD_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
SD_Error errorstatus=SD_OK;
u8 clkdiv=0;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOD|RCC_AHB1Periph_DMA2, ENABLE);//使能GPIOC,GPIOD DMA2时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SDIO, ENABLE);//SDIO时钟使能
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SDIO, ENABLE);//SDIO复位
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12; //PC8,9,10,11,12复用功能输出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//100M
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOC, &GPIO_InitStructure);// PC8,9,10,11,12复用功能输出
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_2;
GPIO_Init(GPIOD, &GPIO_InitStructure);//PD2复用功能输出
//引脚复用映射设置
GPIO_PinAFConfig(GPIOC,GPIO_PinSource8,GPIO_AF_SDIO); //PC8,AF12
GPIO_PinAFConfig(GPIOC,GPIO_PinSource9,GPIO_AF_SDIO);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_SDIO);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_SDIO);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource12,GPIO_AF_SDIO);
GPIO_PinAFConfig(GPIOD,GPIO_PinSource2,GPIO_AF_SDIO);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SDIO, DISABLE);//SDIO结束复位
//SDIO外设寄存器设置为默认值
SDIO_Register_Deinit();
NVIC_InitStructure.NVIC_IRQChannel = SDIO_IRQn; //IRQ通道使能
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//抢占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0; //子优先级0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器、
errorstatus=SD_PowerON(); //SD卡上电
if(errorstatus==SD_OK)
errorstatus=SD_InitializeCards(); //初始化SD卡
if(errorstatus==SD_OK)
errorstatus=SD_GetCardInfo(&SDCardInfo); //获取卡信息
if(errorstatus==SD_OK)
errorstatus=SD_SelectDeselect((u32)(SDCardInfo.RCA<<16));//选中SD卡
if(errorstatus==SD_OK)
errorstatus=SD_EnableWideBusOperation(SDIO_BusWide_4b); //4位宽度,如果是MMC卡,则不能用4位模式
if((errorstatus==SD_OK)||(SDIO_MULTIMEDIA_CARD==CardType))
{
if(SDCardInfo.CardType==SDIO_STD_CAPACITY_SD_CARD_V1_1||SDCardInfo.CardType==SDIO_STD_CAPACITY_SD_CARD_V2_0)
{
clkdiv=SDIO_TRANSFER_CLK_DIV+2; //V1.1/V2.0卡，设置最高48/4=12Mhz
}else clkdiv=SDIO_TRANSFER_CLK_DIV; //SDHC等其他卡，设置最高48/2=24Mhz
SDIO_Clock_Set(clkdiv); //设置时钟频率,SDIO时钟计算公式:SDIO_CK时钟=SDIOCLK/[clkdiv+2];其中,SDIOCLK固定为48Mhz
//errorstatus=SD_SetDeviceMode(SD_DMA_MODE); //设置为DMA模式
errorstatus=SD_SetDeviceMode(SD_POLLING_MODE);//设置为查询模式
}
return errorstatus;
}
/*
printf("SD Card Size: %lldMB\r\n",SDCardInfo.CardCapacity>>20);
LCD_ShowString(10,120,tftlcd_data.width,tftlcd_data.height,16,"SD Card Size: MB");
LCD_ShowNum(10+13*8,120,SDCardInfo.CardCapacity>>20,5,16);//显示SD卡容量
-*/
多媒体卡协会网站 www.mmca.org
SD 卡协会网站 www.sdcard.org
CE-ATA 工作组网站 www.ce-ata.org
