cjsd.c

没有谁会编写低速模式的下的SDHC驱动

      									
  
    if (resp != 0)
        return SD_ERR_CMD_RESP;							/* 响应错误 response is error */
    
	return (SD_ReadRegister(csdlen, recbuf));
}

/*******************************************************************************************************************
** 函数名称: unsigned char SD_ReadCID()						Name:	  unsigned char SD_ReadCID()
** 功能描述: 读SD卡的CID寄存器						Function: read CID register of sd card
** 输　  入: unsigned char cidlen  : 寄存器长度(固定为16)			  unsigned char cidlen  : len of register (fixed,is 16)
			 unsigned char *recbuf : 接收缓冲区					      unsigned char *recbuf : recbuffer	
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
********************************************************************************************************************/
#if SD_ReadCID_EN
unsigned char SD_ReadCID(unsigned char cidlen, unsigned char *recbuf)
{
    unsigned char 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: unsigned char SD_StopTransmission()			Name:	  unsigned char 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
*********************************************************************************************************************/
unsigned char SD_StopTransmission(void)
{
	unsigned char 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: unsigned char SD_ReadCard_Status()				Name:	  unsigned char 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: unsigned char len: 	 寄存器长度(固定为2)			  unsigned char len:      len of register (fixed,is 2)
			 unsigned char *recbuf : 接收缓冲区					      unsigned char *recbuf : recbuffer
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
**********************************************************************************************************************/
unsigned char SD_ReadCard_Status(unsigned char len, unsigned char *buffer)
{
    unsigned char 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: unsigned char Sd_SetBlockLen()					Name:	  unsigned char Sd_SetBlockLen()
** 功能描述: 设置一个块的长度						Function: set a block len of sd card 
** 输　  入: unsigned long length	: 块的长度值			Input:	  unsigned long length	: the length of a block
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
unsigned char SD_SetBlockLen(unsigned long length)
{
	unsigned char 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: unsigned char SD_ReadSingleBlock()				Name:	  unsigned char SD_ReadSingleBlock()
** 功能描述: 读单块命令								Function: read single block command
** 输　  入: unsigned long blockaddr: 块地址				Input:	  unsigned long blockaddr: block address
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right	>0:  error code
*********************************************************************************************************************/
unsigned char SD_ReadSingleBlock(unsigned long blockaddr)
{
	return (SD_BlockCommand(CMD17, CMD17_R, blockaddr)); /* 读单块命令 command that read single block */
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_ReadMultipleBlock()			Name:	  unsigned char SD_ReadMultipleBlock()
** 功能描述: 读多块命令								Function: read multiple block command 
** 输　  入: unsigned long blockaddr: 块地址				Input:	  unsigned long blockaddr: block address
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
unsigned char SD_ReadMultipleBlock(unsigned long blockaddr)
{
	return (SD_BlockCommand(CMD18, CMD18_R, blockaddr)); /* 读多块命令 command that read multiple block */
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_WriteSingleBlock()			Name:	  unsigned char SD_WriteSingleBlock()
** 功能描述: 写单块命令								Function: write single block command
** 输　  入: unsigned long blockaddr: block address		Input:	  unsigned long blockaddr: block address
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
unsigned char SD_WriteSingleBlock(unsigned long blockaddr)
{
	return (SD_BlockCommand(CMD24, CMD24_R, blockaddr)); /* 写单块命令 command that write single block */
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_WriteMultipleBlock()			Name:	  unsigned char SD_WriteMultipleBlock()
** 功能描述: 写多块命令								Function: write multiple block command
** 输　  入: unsigned long blockaddr: 块地址				Input:	  unsigned long blockaddr: block address
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right	>0:  error code
*********************************************************************************************************************/
unsigned char SD_WriteMultipleBlock(unsigned long blockaddr)
{
	return (SD_BlockCommand(CMD25, CMD25_R, blockaddr)); /* 写多块命令 command that write multiple block */
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_ProgramCSD()						Name:	  unsigned char SD_ProgramCSD()
** 功能描述: 写CSD寄存器								Function: write CSD register
** 输　  入: unsigned char *buff   		 : CSD寄存器内容		Input:	  unsigned char *buff   	  : the content of CSD register	
			 unsigned char len	  		 : CSD寄存器长度			  	  unsigned char 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
unsigned char SD_ProgramCSD(unsigned char len, unsigned char *buff)
{
	unsigned char 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: unsigned char SD_GetCRC7()						Name:	  unsigned char SD_GetCRC7()
** 功能描述: 计算CRC7								Function: calculate crc7
** 输　  入: unsigned char *pSource: 数据					Input:    unsigned char *pSource: data
			 unsigned short len    : 数据长度						  unsigned short len   : data length
** 输 　 出: CRC7码									Output:	  CRC7 code
*********************************************************************************************************************/
unsigned char SD_GetCRC7(unsigned char *pSource, unsigned short len)
{
	unsigned char i = 0, j;
	unsigned char 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: unsigned char SD_EraseStartBlock()				Name:	  unsigned char 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: unsigned long startblock: 块地址				Input: 	  unsigned long startblock	: block address
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right	   >0:  error code
*********************************************************************************************************************/
unsigned char SD_EraseStartBlock(unsigned long 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: unsigned char SD_EraseEndBlock()				Name:	  unsigned char 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: unsigned long endblock: 块地址				Input:	  unsigned long Length	: block address
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right	   >0:  error code
*********************************************************************************************************************/
unsigned char SD_EraseEndBlock(unsigned long 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: unsigned char SD_EraseSelectedBlock()			Name:	  unsigned char 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
*********************************************************************************************************************/
unsigned char SD_EraseSelectedBlock(void)
{
	unsigned char 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: unsigned char SD_ReadOCR()						Name:	  unsigned char SD_ReadOCR()
** 功能描述: 读操作条件寄存器OCR					Function: read OCR register of sd card
** 输　  入: unsigned char ocrlen  : 寄存器长度(固定为4)	Input:	  unsigned char ocrlen  : len of register (fixed,is 4)
			 unsigned char *recbuf : 接收缓冲区					      unsigned char *recbuf : recbuffer	
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
**********************************************************************************************************************/
unsigned char SD_ReadOCR(unsigned char ocrlen, unsigned char *recbuf)
{
    unsigned char 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: unsigned char SD_EnableCRC()					Name:	  unsigned char 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: unsigned char bEnable : 1:使能 0:禁止			Input:	  unsigned char bEnable : 1:enable  0: disable
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
#if SD_CRC_EN
unsigned char SD_EnableCRC(unsigned char bEnable)
{
	unsigned char 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)