www.pudn.com > SDdriver.rar > sdcmd.c
/*****************************************************************************************************
** Descriptions: sd 卡驱动软件包: SD卡物理层 ---- SD卡SPI模式支持的命令
********************************************************************************************************/
#include "define.h"
/********************************************************************************************************************
** 函数名称: INT8U SD_SendCmd() Name: INT8U SD_SendCmd()
** 功能描述: 向卡发送命令,并取得响应 Function: send command to the card,and get a response
** 输 入: INT8U cmd : 命令字 Input: INT8U cmd : command byte
INT8U *param : 命令参数,长度为4字节 INT8U *param : command parameter,length is 4 bytes
INT8U resptype : 响应类型 INT8U resptype: response type
INT8U *resp : 响应,长度为1-5字节 INT8U *resp : response,length is 1-5 bytes
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
uint8 SD_SendCmd(uint8 cmd, uint8 *param, uint8 resptype, uint8 *resp)
{
int32 i,rlen; //所有SD卡命令都是6字节长
uint8 tmp;
SPI_CS_Assert(); //片选SPI从机
SPI_SendByte((cmd & 0x3F) | 0x40); /* 发送命令头和命令字 send command header and word */
//起始位为0（bit47），传输位为1（bit46）
for (i = 3; i >= 0; i--)
SPI_SendByte(param[i]); /* 发送参数 send parameters */
#if SD_CRC_EN
tmp = SD_GetCmdByte6((cmd & 0x3F) | 0x40, param);
SPI_SendByte(tmp);
#else
SPI_SendByte(0x95); /* CRC校验码,只用于第1个命令 CRC,only used for the first command */
#endif
rlen = 0;
switch (resptype) /* 根据不同的命令,得到不同的响应长度 */
{ /* according various command,get the various response length */
case R1:
case R1B: rlen = 1; break;
case R2: rlen = 2; break;
case R3: rlen = 5; break;
default: SPI_SendByte(0xFF);
SPI_CS_Deassert();
return SD_ERR_CMD_RESPTYPE; /* 返回命令响应类型错误 return error of command response type */
break;
}
i = 0;
do /* 等待响应,响应的开始位为0 */
{ /* Wait for a response,a response is a start bit(zero) */
tmp = SPI_RecByte();
i++;
}
while (((tmp & 0x80) != 0) && (i < SD_CMD_TIMEOUT));
if (i >= SD_CMD_TIMEOUT)
{
SPI_CS_Deassert();
return SD_ERR_CMD_TIMEOUT; /* 返回命令超时 return response timeout of command */
}
for (i = rlen - 1; i >= 0; i--)
{
resp[i] = tmp;
tmp = SPI_RecByte(); /* 循环的最后发送8clock at the last recycle,clock out 8 clock */
}
SPI_CS_Deassert();
return SD_NO_ERR; /* 返回执行成功 return perform sucessfully */
}
/********************************************************************************************************************
** 函数名称: void SD_PackParam() Name: void SD_PackParam()
** 功能描述: 将32位的参数转为字节形式 Function: change 32bit parameter to bytes form
** 输 入: INT8U *parameter: 字节参数缓冲区 Input: INT8U *parameter: the buffer of bytes parameter
INT32U value : 32位参数 INT32U value : 32bit parameter
** 输 出: 无 Output: NULL
*********************************************************************************************************************/
void SD_PackParam(uint8 *parameter, uint32 value)
{
parameter[3] = (uint8)(value >> 24);
parameter[2] = (uint8)(value >> 16);
parameter[1] = (uint8)(value >> 8);
parameter[0] = (uint8)(value);
}
/********************************************************************************************************************
** 函数名称: INT8U SD_BlockCommand() Name: INT8U SD_BlockCommand()
** 功能描述: 块命令 Function: command about block operation
** 输 入: INT8U cmd : 命令字 Input: INT8U cmd : command byte
INT8U resptype : 响应类型 INT8U resptype : response type
INT32U parameter: 块操作参数 INT32U parameter: parameter of block operation
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_BlockCommand(uint8 cmd, uint8 resptype, uint32 parameter)
{
uint8 param[4],resp,ret;
parameter <<= SD_BLOCKSIZE_NBITS; /* 调整地址:左移9位 adjust address: move 9 bits left */
SD_PackParam(param, parameter); /* 将参数转化为字节形式 change the parameter to bytes form */
ret = SD_SendCmd(cmd, param, resptype, &resp);
if (ret != SD_NO_ERR)
return ret; /* 结束数据传输失败 stop transmission operation fail */
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return SD_NO_ERR;
}
/*
************************************************
下面为SD卡SPI命令
************************************************
*/
/********************************************************************************************************************
** 函数名称: INT8U SD_ResetSD() Name: INT8U SD_ResetSD()
** 功能描述: 复位SD卡 Function: reset sd card
** 输 入: 无 Input: NULL
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_ResetSD(void) /////
{
uint8 param[4] = {0,0,0,0},resp;
return (SD_SendCmd(CMD0, param, CMD0_R, &resp)); /* 复位命令 command that reset sd card */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadCSD() Name: INT8U SD_ReadCSD()
** 功能描述: 读SD卡的CSD寄存器 Function: read CSD register of sd card
** 输 入: INT8U csdlen : 寄存器长度(固定为16) INT8U csdlen : len of register (fixed,is 16)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_ReadCSD(uint8 csdlen, uint8 *recbuf)
{
uint8 param[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD9, param, CMD9_R, &resp); /* 读CSD寄存器命令 command that read CSD register */
if (ret != SD_NO_ERR)
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return (SD_ReadRegister(csdlen, recbuf));
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_ReadCID() Name: INT8U SD_ReadCID()
** 功能描述: 读SD卡的CID寄存器 Function: read CID register of sd card
** 输 入: INT8U cidlen : 寄存器长度(固定为16) INT8U cidlen : len of register (fixed,is 16)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
#if SD_ReadCID_EN
uint8 SD_ReadCID(uint8 cidlen, uint8 *recbuf)
{
uint8 param[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD10, param, CMD10_R, &resp); /* 读CID寄存器命令 command that read CID register */
if ( ret != SD_NO_ERR)
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return (SD_ReadRegister(cidlen, recbuf));
}
#endif
/********************************************************************************************************************
** 函数名称: INT8U SD_StopTransmission() Name: INT8U SD_StopTransmission()
** 功能描述: 停止数据传输 Function: stop data transmission
** 输 入: 无 Input: NULL
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_StopTransmission(void)
{
uint8 param[4] = {0,0,0,0},resp;
return (SD_SendCmd(CMD12, param, CMD12_R, &resp)); /* 结束数据传输命令失败 stop transmission command fail */
}
/*********************************************************************************************************************
** 函数名称: INT8U SD_ReadCard_Status() Name: INT8U SD_ReadCard_Status()
** 功能描述: 读SD卡的 Card Status 寄存器 Function: read Card Status register of sd card
** 输 入: INT8U len: 寄存器长度(固定为2) INT8U len: len of register (fixed,is 2)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
**********************************************************************************************************************/
uint8 SD_ReadCard_Status(uint8 len, uint8 *buffer)
{
uint8 param[4] = {0,0,0,0};
return (SD_SendCmd(CMD13, param, CMD13_R, buffer)); /* 读 Card Status 寄存器 */
/* read register of Card Status */
}
/********************************************************************************************************************
** 函数名称: INT8U Sd_SetBlockLen() Name: INT8U Sd_SetBlockLen()
** 功能描述: 设置一个块的长度 Function: set a block len of sd card
** 输 入: INT32U length : 块的长度值 Input: INT32U length : the length of a block
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_SetBlockLen(uint32 length)
{
uint8 param[4],resp,ret;
SD_PackParam(param, length); /* 将参数转化为字节形式 change the parameter to bytes form */
ret = SD_SendCmd(CMD16, param, CMD16_R, &resp);
if (ret != SD_NO_ERR)
return ret; /* 设置块的长度为length失败 set the length of block to length fail */
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return SD_NO_ERR; /* 返回执行成功 return perform sucessfully */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadSingleBlock() Name: INT8U SD_ReadSingleBlock()
** 功能描述: 读单块命令 Function: read single block command
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_ReadSingleBlock(uint32 blockaddr)
{
return (SD_BlockCommand(CMD17, CMD17_R, blockaddr)); /* 读单块命令 command that read single block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadMultipleBlock() Name: INT8U SD_ReadMultipleBlock()
** 功能描述: 读多块命令 Function: read multiple block command
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_ReadMultipleBlock(uint32 blockaddr)
{
return (SD_BlockCommand(CMD18, CMD18_R, blockaddr)); /* 读多块命令 command that read multiple block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_WriteSingleBlock() Name: INT8U SD_WriteSingleBlock()
** 功能描述: 写单块命令 Function: write single block command
** 输 入: INT32U blockaddr: block address Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_WriteSingleBlock(uint32 blockaddr)
{
return (SD_BlockCommand(CMD24, CMD24_R, blockaddr)); /* 写单块命令 command that write single block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_WriteMultipleBlock() Name: INT8U SD_WriteMultipleBlock()
** 功能描述: 写多块命令 Function: write multiple block command
** 输 入: INT32U blockaddr: 块地址 Input: INT32U blockaddr: block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_WriteMultipleBlock(uint32 blockaddr)
{
return (SD_BlockCommand(CMD25, CMD25_R, blockaddr)); /* 写多块命令 command that write multiple block */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_ProgramCSD() Name: INT8U SD_ProgramCSD()
** 功能描述: 写CSD寄存器 Function: write CSD register
** 输 入: INT8U *buff : CSD寄存器内容 Input: INT8U *buff : the content of CSD register
INT8U len : CSD寄存器长度 INT8U len : the length of CSD register
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
#if SD_ProgramCSD_EN
uint8 SD_ProgramCSD(uint8 len, uint8 *buff)
{
uint8 param[4] = {0,0,0,0},resp,ret;
if (len != 16) return SD_ERR_USER_PARAM;
ret = SD_SendCmd(CMD27, param, CMD27_R, &resp); /* 发送写CSD寄存器命令 send command that write CSD */
if (ret != SD_NO_ERR)
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP;
buff[15] = (SD_GetCRC7(buff, 15) << 1) + 0x01; /* 计算CSD中的crc 位域 calculate crc field in CSD */
return(SD_WriteBlockData(0, 16, buff));
}
/********************************************************************************************************************
** 函数名称: INT8U SD_GetCRC7() Name: INT8U SD_GetCRC7()
** 功能描述: 计算CRC7 Function: calculate crc7
** 输 入: INT8U *pSource: 数据 Input: INT8U *pSource: data
INT16U len : 数据长度 INT16U len : data length
** 输 出: CRC7码 Output: CRC7 code
*********************************************************************************************************************/
uint8 SD_GetCRC7(INT8U *pSource, INT16U len)
{
uint8 i = 0, j;
uint8 reg = 0;
do
{
for (j = 0; j < 8; j++)
{
reg <<= 1;
reg ^= ((((pSource[i] << j) ^ reg) & 0x80) ? 0x9 : 0);
}
i++;
}while(i < len);
return reg;
}
#endif
#if SD_EraseBlock_EN
/********************************************************************************************************************
** 函数名称: INT8U SD_EraseStartBlock() Name: INT8U SD_EraseStartBlock()
** 功能描述: 设置块擦除起始地址 Function: select the start block address of erasing operation
** 输 入: INT32U startblock: 块地址 Input: INT32U startblock : block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_EraseStartBlock(INT32U startblock)
{
return (SD_BlockCommand(CMD32, CMD32_R, startblock)); /* 发送擦除起始块地址 send the start block address of erasing operation */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_EraseEndBlock() Name: INT8U SD_EraseEndBlock()
** 功能描述: 设置块擦除终止地址 Function: select the end block address of erasing operation
** 输 入: INT32U endblock: 块地址 Input: INT32U Length : block address
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_EraseEndBlock(INT32U endblock)
{
return (SD_BlockCommand(CMD33, CMD33_R, endblock)); /* 发送擦除终止块地址 send the end block address of erasing operation */
}
/********************************************************************************************************************
** 函数名称: INT8U SD_EraseSelectedBlock() Name: INT8U SD_EraseSelectedBlock()
** 功能描述: 擦除已选中的块 Function: erase block selected
** 输 入: 无 Input: NULL
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_EraseSelectedBlock(void)
{
uint8 param[4],resp,tmp;
SD_PackParam(param, 0);
tmp = SD_SendCmd(CMD38, param, CMD38_R, &resp); /* 擦除所选择的块 erase blocks selected */
if (tmp != SD_NO_ERR)
return tmp;
if (SD_WaitBusy(SD_WAIT_ERASE) != SD_NO_ERR) /* 等待擦除完成 wait for finishing erasing */
return SD_ERR_TIMEOUT_ERASE;
else
return SD_NO_ERR;
}
#endif
/*********************************************************************************************************************
** 函数名称: INT8U SD_ReadOCR() Name: INT8U SD_ReadOCR()
** 功能描述: 读操作条件寄存器OCR Function: read OCR register of sd card
** 输 入: INT8U ocrlen : 寄存器长度(固定为4) Input: INT8U ocrlen : len of register (fixed,is 4)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
**********************************************************************************************************************/
uint8 SD_ReadOCR(uint8 ocrlen, uint8 *recbuf) /////
{
uint8 param[4] = {0,0,0,0},resp[5],tmp;
tmp = SD_SendCmd(CMD58, param, CMD58_R, resp); /* 读 OCR 寄存器命令 */
if (tmp != SD_NO_ERR) /* read OCR register command */
return tmp;
if (resp[0] != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
for (tmp = 0; tmp < 4; tmp++)
recbuf[tmp] = resp[tmp + 1]; /* 复制OCR寄存器内容到接收缓冲区 */
return SD_NO_ERR;
}
/********************************************************************************************************************
** 函数名称: INT8U SD_EnableCRC() Name: INT8U SD_EnableCRC()
** 功能描述: 使能SD卡的CRC校验功能 Function: enable crc check of SD Card
** 输 入: INT8U bEnable : 1:使能 0:禁止 Input: INT8U bEnable : 1:enable 0: disable
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_CRC_EN
uint8 SD_EnableCRC(uint8 bEnable)
{
uint8 param[4],resp,ret;
if (bEnable == 1)
param[0] = 1; /* 使能crc enable crc */
else
param[1] = 0; /* 禁止crc disalbe crc */
ret = SD_SendCmd(CMD59, param, CMD59_R, &resp); /* "使能/禁止CRC"命令 enable/disable crc command */
if (ret != SD_NO_ERR)
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return SD_NO_ERR;
}
#endif
/*********************************************************************************************************************
** 函数名称: INT8U SD_Read_SD_Status() Name: INT8U SD_Read_SD_Status()
** 功能描述: 读SD卡的 SD_Status 寄存器 Function: read SD_Status register of sd card
** 输 入: INT8U sdslen : 寄存器长度(固定为64) Input: INT8U sdslen: len of register (fixed,is 64)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf: recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
**********************************************************************************************************************/
#if SD_ReadSD_Status_EN
uint8 SD_ReadSD_Status(uint8 sdslen, uint8 *recbuf)
{
uint8 param[4] = {0,0,0,0},resp[2],ret;
ret = SD_SendCmd(CMD55, param, CMD55_R, resp); /* 后续命令为一个应用命令 */
if (ret != SD_NO_ERR)
return ret; /* command that the followed commnad is a specific application */
if (resp[0] != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
ret = SD_SendCmd(ACMD13, param, ACMD13_R, resp); /* 读 SD_Status 命令 */
if (ret != SD_NO_ERR)
return ret; /* command that read SD_Status register */
if ((resp[0] != 0) || (resp[1] != 0))
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return (SD_ReadBlockData(sdslen, recbuf)); /* 读出寄存器内容 read the content of the register */
}
#endif
/*******************************************************************************************************************
** 函数名称: INT8U SD_ReadSCR() Name: INT8U SD_ReadSCR()
** 功能描述: 读SD卡的 SCR 寄存器 Function: read SCR register of sd card
** 输 入: INT8U scrlen : 寄存器长度(固定为8) Input: INT8U scrlen : len of register (fixed,is 8)
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : recbuffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
#if SD_ReadSCR_EN
uint8 SD_ReadSCR(uint8 scrlen, uint8 *recbuf)
{
uint8 param[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD55, param, CMD55_R, &resp); /* 后续命令为一个应用命令 */
if (ret != SD_NO_ERR) /* command that the followed commnad is a specific application */
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
ret = SD_SendCmd(ACMD51, param, ACMD51_R, &resp); /* 发送读 SD_Status 命令*/
if (ret != SD_NO_ERR) /* command that read SD_Status register */
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
return (SD_ReadBlockData(scrlen, recbuf)); /* 读出寄存器内容 read the content of the register */
}
#endif
/********************************************************************************************************************
** 函数名称: INT8U SD_GetNumWRBlcoks() Name: INT8U SD_GetNumWRBlcoks()
** 功能描述: 得到正确写入的块数 Function: get the block numbers that written correctly
** 输 入: INT32U *blocknum: 返回的块数 Input: INT32U blocknum : the block numbers returned
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
#if SD_WriteMultiBlock_EN
uint8 SD_GetNumWRBlcoks(uint32 *blocknum)
{
uint8 tmp[4] = {0,0,0,0},resp,ret;
ret = SD_SendCmd(CMD55, tmp, CMD55_R, &resp); /* 后续命令为一个应用命令 */
if (ret != SD_NO_ERR) /* command that the followed commnad is a specific application */
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP;
ret = SD_SendCmd(ACMD22, tmp, ACMD22_R, &resp); /* 读取正确写入的块数命令 */
if (ret != SD_NO_ERR) /* command that read the numbers of block written correctly */
return ret;
if (resp != 0)
return SD_ERR_CMD_RESP; /* 响应错误 response is error */
ret = SD_ReadBlockData(4, tmp); /* 读块数 read the numbvers of block */
if (ret != SD_NO_ERR)
return ret;
*blocknum = (tmp[0] << 24) + (tmp[1] << 16) + (tmp[2] << 8) + tmp[3];
/* 转换为32位 change to 32 bits */
return SD_NO_ERR; /* 返回执行成功 return perform sucessfully */
}
#endif
/*********************************************************
下面为一些数据传输函数
**********************************************************/
/********************************************************************************************************************
** 函数名称: INT8U SD_ReadRegister() Name: INT8U SD_ReadRegister()
** 功能描述: 从SD卡读取数据 Function: read data from SD card
** 输 入: INT32U len : 长度 Input: INT32U len : length
INT8U *recbuf: 接收缓冲区 INT8U *recbuf: receive buffer
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*********************************************************************************************************************/
uint8 SD_ReadRegister(uint32 len, uint8 *recbuf)
{
uint32 i = 0;
uint8 resp;
SPI_CS_Assert();
do{ /* 等待数据起始令牌 wait for data start token */
resp = SPI_RecByte();
i++;
}while((resp == 0xFF) && (i < SD_READREG_TIMEOUT));
if (i >= SD_READREG_TIMEOUT)
{
SPI_CS_Deassert();
return SD_ERR_TIMEOUT_READ; /* 超时, 返回错误 timeout, return error */
}
if (resp != SD_TOK_READ_STARTBLOCK)
{ /* 不是收到数据起始令牌 not receive data start token */
recbuf[0] = resp;
i = 1; /* 还有len - 1个字节要接收 still len - 1 bytes will be received */
}
else
i = 0; /* 收到数据起始令牌,还有len个字节要接收 received data start token,still len bytes will be received */
for (; i < len; i++)
recbuf[i] = SPI_RecByte(); /* 接收数据 receive data */
i = SPI_RecByte();
i = (i << 8) + SPI_RecByte(); /* 读取16位CRC get 16-bit CRC */
#if SD_CRC_EN
if (i != SD_GetCRC16(recbuf, len))
{ /* CRC校验错误 CRC check is error */
SPI_CS_Deassert();
SPI_SendByte(0xFF);
return SD_ERR_DATA_CRC16; /* 返回RCR16错误 return error of CRC16 */
}
#endif
SPI_SendByte(0xFF); /* 返回之前发送8个clock clock out 8 clk before return */
SPI_CS_Deassert();
return SD_NO_ERR;
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_ReadBlockData() Name: INT8U SD_ReadBlockData()
** 功能描述: 从SD卡中读取数据块 Function: read block data from sd card
** 输 入: INT32U len : 长度 Input: INT32U len : length
INT8U *recbuf : 接收缓冲区 INT8U *recbuf : the buffer of receive
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
*******************************************************************************************************************/
uint8 SD_ReadBlockData(uint32 len, uint8 *recbuf)
{
uint8 tmp;
uint32 i = 0;
SPI_CS_Assert();
do
{ /* 等待接收数据开始令牌0xFE wait for receiving data start token 0xFE */
tmp = SPI_RecByte();
i++;
}while((tmp == 0xFF) && (i < sds.timeout_read));
if (i >= sds.timeout_read)
{
SPI_CS_Deassert();
return SD_ERR_TIMEOUT_READ; /* 返回读超时错误码 return error timeout error code of reading */
}
if (tmp != SD_TOK_READ_STARTBLOCK) /* 块读开始令牌错误 read start block token is error */
{
SPI_SendByte(0xFF);
SPI_CS_Deassert();
return SD_ERR_DATA_START_TOK;
}
for (i = 0; i < len; i++)
recbuf[i] = SPI_RecByte(); /* 接收数据 receive data */
i = SPI_RecByte();
i = (i << 8) + SPI_RecByte(); /* 读取16位CRC get 16-bit CRC */
#if SD_CRC_EN
if (i != SD_GetCRC16(recbuf, len))
{ /* CRC校验错误 CRC check is error */
SPI_SendByte(0xFF);
SPI_CS_Deassert();
return SD_ERR_DATA_CRC16; /* 返回CRC16错误 return error of CRC16 */
}
#endif
SPI_SendByte(0xFF);
SPI_CS_Deassert();
return SD_NO_ERR; /* 返回函数执行成功 return function perform sucessfully */
}
/*******************************************************************************************************************
** 函数名称: INT8U SD_WriteBlockData() Name: INT8U SD_WriteBlockData()
** 功能描述: 向sd卡写数据块 Function: write block data to sd card
** 输 入: INT8U bmulti : 是否为多块操作1:是0:否 Input: INT8U bmulti : multi blocks operate 1:Y 0:N
INT32U len : 长度 INT32U len : length
INT8U *sendbuf: 发送缓冲区 INT8U *sendbuf : the buffer of send
** 输 出: 0: 正确 >0: 错误码 Output: 0: right >0: error code
********************************************************************************************************************/
uint8 SD_WriteBlockData(uint8 bmulti, uint32 len, uint8 *sendbuf)
{
uint16 i;
uint8 tmp;
SPI_CS_Assert();
SPI_SendByte(0xFF); /* 开始发送数据之前发送8个clock clock out 8 clk before start */
if (bmulti == 1)
SPI_SendByte(SD_TOK_WRITE_STARTBLOCK_M); /* 写多块开始令牌 start token of write multi blocks */
else
SPI_SendByte(SD_TOK_WRITE_STARTBLOCK); /* 写单块开始令牌 start token of write single block */
for (i = 0; i < len; i++)
SPI_SendByte(sendbuf[i]); /* 发送数据 send data */
#if SD_CRC_EN
i = SD_GetCRC16(sendbuf,len); /* 计算CRC16 calculate CRC16 */
#endif
SPI_SendByte((i >> 8) & 0xFF);
SPI_SendByte(i & 0xFF); /* 发送CRC16校验码 send CRC16 check code */
tmp = SPI_RecByte();
if ((tmp & SD_RESP_DATA_MSK) != SD_RESP_DATA_ACCETPTED)
{
SPI_SendByte(0xFF); /* 返回之前发送8个clock clock out 8 clk before return */
SPI_CS_Deassert();
return SD_ERR_DATA_RESP; /* 数据响应错误 data response error */
}
SPI_CS_Deassert();
if (SD_WaitBusy(SD_WAIT_WRITE) != SD_NO_ERR)
return SD_ERR_TIMEOUT_WRITE; /* 写入超时 write time out */
else
return SD_NO_ERR; /* 写入正确 write right */
}
/*******************************************************************************************************************
** 函数名称: void SD_StopMultiToken() Name: void SD_StopMultiToken(void)
** 功能描述: 发送多块写停止令牌 Function: send the token that stop multiple block write
** 输 入: 无 Input: NULL
** 输 出: 无 Output: NULL
********************************************************************************************************************/
void SD_StopMultiToken(void)
{
SPI_CS_Assert();
SPI_SendByte(0xFF); /* 先发送8个clock send 8 clock first */
SPI_SendByte(SD_TOK_STOP_MULTI); /* 发送停止数据传输令牌 send stop transmission token */
SPI_RecByte();
SPI_CS_Deassert();
}
/********************************************************************************************************************
** 函数名称: void SD_WaitBusy() Name: void SD_WaitBusy()
** 功能描述: 查询SD卡是否处于忙状态 Function: poll SD Card wheather it is busy
** 输 入: INT32U waittype: 超时类型 Input: INT32U timeout: time out type
** 输 出: 0: 未超时 >0: 错误码 Output: 0: not time out > 0: error code
*********************************************************************************************************************/
uint8 SD_WaitBusy(uint8 waittype)
{
uint32 timeout, i = 0;
uint8 tmp;
if (waittype == SD_WAIT_WRITE)
timeout = sds.timeout_write;
else
timeout = sds.timeout_erase;
SPI_CS_Assert();
do
{ /* 等待忙结束 wait for being busy end */
tmp = SPI_RecByte();
i++;
}while ((tmp != 0xFF) && (i < timeout)); /* 忙时收到的值为0xFF always receive 0xFF when card is busy */
SPI_CS_Deassert(); /* 有错 */
if(i < timeout)
return SD_NO_ERR; /* 返回0,表示没超时 return 0 indicate that operation is not time out */
else
return SD_ERR_TIMEOUT_WAIT; /* 返回错误码,表示超时 return error code indicate that operation is time out */
}
/********************************************************************************************************************
** 函数名称: void SD_SPIDelay() Name: void SD_SPIDelay()
** 功能描述: SPI总线延时 Function: SPI Bus delay
** 输 入: INT8U value: 延时值,不超过255 Input: INT8U value : delay value,do not beyond 255
** 输 出: 无 Output: NULL
*********************************************************************************************************************/
void SD_SPIDelay(uint8 value)
{
uint8 i;
for (i = 0; i < value; i++)
SPI_SendByte(0xFF); /* 发送0xFF clock out 0xFF */
}