实际sd卡初始化的时候有的指令要多发几次才有响应，lz可以参考下我这个初始化代码
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] SDCard(SPI Mode) Initialization
* @param None
* @retval Operation Result Depending on Response Token
*/
uint8_t SD_SPI_Init(void)
{
uint8_t rs = SD_OK;
uint8_t sd_ver;
uint32_t i, tick_now;
SD_CMDTypeDef SD_CMD;
SD_R1TypeDef R1;
SD_R3TypeDef R3;
SD_R7TypeDef R7;
if(SD_InitState != 0)
{
goto DONE;
}
//MSP Initialization
SD_SPI_MspInit();
//Least then 400KHz
SD_NormalSpeed();
//Delay for Power up
HAL_Delay(20);
//In case of SPI mode, CS shall be held to high during 74 clock cycles
SD_CS_SET();
for(i = 0; i < 8; i++)
{
SD_WR_Byte(0xFF);
}
//CMD0+, Goto idle State
tick_now = HAL_GetTick();
do
{
if((HAL_GetTick() - tick_now) > GOTO_IDLE_TIMEOUT)
{
//Timeout and Return
rs = SD_TIMEOUT;
goto DONE;
}
SD_CMD.Cmd = GO_IDLE_STATE;
SD_CMD.Arg = 0;
SD_CMD.Crc = 0x95;
rs = SD_W_CMD_R1(&SD_CMD, &R1);
if(rs == SD_OK)
{
if((R1 & R1_IDLE_STATE) == 0)
{
rs = SD_ERROR;
}
}
}
while(rs != SD_OK);
//CMD8, Sends SD Memory Card interface condition
SD_CMD.Cmd = SEND_IF_COND;
SD_CMD.Arg = 0x1AA;
SD_CMD.Crc = 0x87;
rs = SD_W_CMD_R7(&SD_CMD, &R7);
if(rs != SD_OK)
{
goto DONE;
}
if(R7.R1 & R1_IDLE_STATE)
{
if(R7.R1 & R1_ILLEGAL_CMD)
{
//Ver1.X SD Menmory Card or Not SD Menmory Card
sd_ver = SD_V1X_STANDARD_CAPACITY;
}
else
{
if((R7.VoltageAccepted != 0x01)||(R7.CheckPattern != 0xAA))
{
rs = SD_ERROR;
goto DONE;
}
//Ver2.00 or later SD Memory Card
}
}
//Wait Card Ready
tick_now = HAL_GetTick();
do
{
if((HAL_GetTick() - tick_now) > CARD_READY_TIMEOUT)
{
rs = SD_TIMEOUT;
goto DONE;
}
//CMD55, Defines to the card that the next command is an application
SD_CMD.Cmd = APP_CMD;
SD_CMD.Arg = 0;
SD_CMD.Crc = 0;
rs = SD_W_CMD_R1(&SD_CMD, &R1);
if(rs != SD_OK)
{
goto DONE;
}
if(R1 != R1_IDLE_STATE)
{
rs = SD_ERROR;
goto DONE;
}
//ACMD41, Sends host capacity support information and activates the card's initialization process.
SD_CMD.Cmd = SD_SEND_OP_COND;
if(sd_ver == SD_V1X_STANDARD_CAPACITY)
{
SD_CMD.Arg = 0<<30;
}
else
{
SD_CMD.Arg = 1<<30;
}
SD_CMD.Crc = 0;
rs = SD_W_CMD_R1(&SD_CMD, &R1);
if(rs == SD_OK)
{
if(R1 & R1_IDLE_STATE)
{
rs = SD_ERROR;
}
}
}
while(rs != SD_OK);
//CMD58, Reads the OCR register
SD_CMD.Cmd = READ_OCR;
SD_CMD.Arg = 0;
SD_CMD.Crc = 0;
rs = SD_W_CMD_R3(&SD_CMD, &R3);
if(rs != SD_OK)
{
goto DONE;
}
if(R3.R1 != 0)
{
rs = SD_ERROR;
goto DONE;
}
if(R3.Ocr & 0x80000000ul)
{
if(sd_ver != SD_V1X_STANDARD_CAPACITY)
{
if(R3.Ocr & (1<<30))
{
sd_ver = SD_V2X_HIGH_CAPCITY;
}
else
{
sd_ver = SD_V2X_STANDARD_CAPCITY;
}
}
}
else
{
rs = SD_ERROR;
goto DONE;
}
SD_BurstSpeed();
//CMD59, Turns the CRC option on or off.
SD_CMD.Cmd = CRC_ON_OFF;
SD_CMD.Arg = 0;
SD_CMD.Crc = 0;
rs = SD_W_CMD_R1(&SD_CMD, &R1);
if(sd_ver < SD_V2X_HIGH_CAPCITY)
{
//CMD16, In case of SDSC Card, block length is set by this command.
SD_CMD.Cmd = SET_BLOCKLEN;
SD_CMD.Arg = SD_BLOCK_SIZE;
SD_CMD.Crc = 0;
rs = SD_W_CMD_R1(&SD_CMD, &R1);
}
SD_CardType = sd_ver;
SD_InitState = 1;
DONE:
return rs;
}
下面是类型定义
#ifndef __SDCARD_SPI_HW_H
#define __SDCARD_SPI_HW_H
typedef struct _SD_CMDTypeDef
{
uint8_t Cmd;
uint32_t Arg;
uint8_t Crc;
}SD_CMDTypeDef;
typedef uint8_t SD_R1TypeDef;
typedef uint8_t SD_R1bTypeDef;
typedef struct _SD_R2TypeDef
{
SD_R1TypeDef R1;
uint8_t R2;
}SD_R2TypeDef;
typedef struct _SD_R3TypeDef
{
SD_R1TypeDef R1;
uint32_t Ocr;
}SD_R3TypeDef;
typedef struct _SD_R7TypeDef
{
SD_R1TypeDef R1;
uint8_t CommandVersion;
uint8_t Resv;
uint8_t VoltageAccepted;
uint8_t CheckPattern;
}SD_R7TypeDef;
/* CMD argumant mask */
#define CMD_START (1<<6)
#define CMD_END (1<<0)
/* Normal Command */
#define GO_IDLE_STATE 0 //R1
#define SEND_OP_COND 1 //R1
#define SWITCH_FUNC 6 //R1
#define SEND_IF_COND 8 //R7
#define SEND_CSD 9 //R1
#define SEND_CID 10 //R1
#define STOP_TRANSMISSION 12 //R1b
#define SEND_STATUS 13 //R2
#define SET_BLOCKLEN 16 //R1
#define READ_SINGLE_BLOCK 17 //R1
#define READ_MULTIPLE_BLOCK 18 //R1
#define WRITE_BLOCK 24 //R1
#define WRITE_MULTIPLE_BLOCK 25 //R1
#define PROGRAM_CSD 27 //R1
#define SET_WRITE_PROT 28 //R1b
#define CLR_WRITE_PROT 29 //R1b
#define SEND_WRITE_PROT 30 //R1
#define ERASE_WR_BLK_START_ADDR 32 //R1
#define ERASE_WR_BLK_END_ADDR 33 //R1
#define ERASE 38 //R1b
#define LOCK_UNLOCK 42 //R1
#define APP_CMD 55 //R1
#define GEN_CMD 56 //R1
#define READ_OCR 58 //R3
#define CRC_ON_OFF 59 //R1
/* Application Command */
#define SD_STATUS 13 //R2
#define SEND_NUM_WR_BLOCKS 22 //R1
#define SET_WR_BLK_ERASE_COUNT 23 //R1
#define SD_SEND_OP_COND 41 //R1
#define SET_CLR_CARD_DETECT 42 //R1
#define SEND_SCR 51 //R1
/* R1 Response Bit Define */
#define R1_IDLE_STATE ((1)<<0)
#define R1_ERASE_RESET ((1)<<1)
#define R1_ILLEGAL_CMD ((1)<<2)
#define R1_CRC_ERROR ((1)<<3)
#define R1_ERASE_ERROR ((1)<<4)
#define R1_ADDR_ERROR ((1)<<5)
#define R1_ARG_ERROR ((1)<<6)
/* Data Trans Token */
#define TOKEN_START_WR_BLOCK ((uint8_t)0xFE)
#define TOKEN_STATR_W_MULTI_BLOCK ((uint8_t)0xFC)
#define TOKEN_STOP_W_MULTI_BLOCK ((uint8_t)0xFD)
#endif
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