cjsd.c

没有谁会编写低速模式的下的SDHC驱动

** 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: unsigned long waittype: 超时类型				Input:	  unsigned long timeout: time out type
** 输 　 出: 0: 未超时  >0: 错误码					Output:	  0: not time out   > 0: error code
*********************************************************************************************************************/
unsigned char SD_WaitBusy(unsigned char waittype)
{
    unsigned long timeout, i = 0;
    unsigned char 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: unsigned char value: 延时值,不超过255		    Input:	  unsigned char value : delay value,do not beyond 255
** 输 　 出: 无										Output:	  NULL
*********************************************************************************************************************/
void SD_SPIDelay(unsigned char value)
{
    unsigned char i;

    for (i = 0; i < value; i++)
        SPI_SendByte(0xFF);						 	/* 发送0xFF clock out 0xFF */
} 
 
 
    
	/*       
	***************************************************************************************************
		
	     用户API函数:  初始化,读,写,擦 SD卡  User API Function: Initialize,read,write,erase SD Card 
				
	***************************************************************************************************
	*/

				
/*******************************************************************************************************************
** 函数名称: unsigned char SD_Initialize()				Name:	  unsigned char SD_Initialize()
** 功能描述: 初始化SD卡							Function: initialize sd card
** 输　  入: 无									Input:	  NULL
** 输 　 出: 0:   正确    >0:   错误码		  	Output:	  0:  right		>0:  error code
********************************************************************************************************************/
unsigned char SD_Initialize(void)
{
	unsigned char recbuf[4],ret;
    
    SD_HardWareInit();					    		/* 初始化读写SD卡的硬件条件 Initialize the hardware that access SD Card */
    
    if (SD_ChkCard() != 1)							/* 检查卡是否插入 check weather card is inserted */
    	return SD_ERR_NO_CARD;   
         
    SPI_CS_Assert();								/* 1. 置CS为低 assert CS */  
	SD_SPIDelay(25);								/* 2. 至少延时 74 clock delay more than 74 clock */
    SPI_CS_Deassert();								/* 3. 置CS为高 dessert CS */
    SD_SPIDelay(2);									/* 4. 延时2(8 clock) delay 2(8 clock) */
    
    ret = SD_ResetSD();								/* 5. 发出CMDO命令复位SD卡 send CMD0 command to reset sd card */
    if (ret != SD_NO_ERR)
        return ret;									
 	
 	ret = SD_ActiveInit();							/* 6. 激活卡进入初始化过程. active card initialize process */
 	if (ret != SD_NO_ERR)
 		return ret;
        
   	ret = SD_ReadOCR(4, recbuf);  					/* 7. 读OCR寄存器,查询卡支持的电压值 read OCR register,get the supported voltage */
    if (ret != SD_NO_ERR)
        return ret;
    
    if ((recbuf[1] & MSK_OCR_33) != MSK_OCR_33)
        return SD_ERR_VOL_NOTSUSP;					/* 不支持3.3V,返回错误码  not support 3.3V,return error code */
    
    SPI_ClkToMax();									/* 8. 设置SPI时钟到最大值 set SPI clock to maximum */
        
#if SD_CRC_EN        
    ret = SD_EnableCRC(1);							/* 使能CRC校验 enable CRC check */
	if (ret != SD_NO_ERR)  
	  	return ret;
#endif

    ret = SD_SetBlockLen(SD_BLOCKSIZE);				/* 9. 设置块的长度: 512Bytes Set the block length: 512Bytes */
    if (ret != SD_NO_ERR)  
        return ret;
        
	return (SD_GetCardInfo());						/* 10. 读CSD寄存器,获取SD卡信息 read CSD register, get the information of SD card */
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_ReadBlock()					Name:	  unsigned char SD_ReadBlock()
** 功能描述: 从SD卡中读一个块						Function: read a single block from sd card
** 输　  入: unsigned long blockaddr: 块地址				Input:    unsigned long blockaddr: address of block
			 unsigned char *recbuf   : 接收缓冲区,长度512Bytes	 	  unsigned char *recbuf   : the buffer of receive,length is 512Bytes
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
unsigned char SD_ReadBlock(unsigned long blockaddr, unsigned char *recbuf)
{
	unsigned char ret; 
	
	if (blockaddr > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;				/* 操作超出卡容量范围 operate over the card range */
	 	
 	
  	return (SD_ReadBlockData(SD_BLOCKSIZE, recbuf));/* 读出数据 read data from sd card */	
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_ReadMultiBlock()				Name:	  unsigned char SD_ReadMultiBlock()
** 功能描述: 从SD卡中读多个块						Function: read multi blocks from sd card
** 输　  入: unsigned long blockaddr: 块地址				Input:	  unsigned long blockaddr: address of block
			 unsigned long blocknum : 块数量						  unsigned long blocknum : the numbers of block
			 unsigned char *recbuf   : 接收缓冲区,每块512字节		  unsigned char *recbuf   : the buffer of receive,each block length is 512Bytes
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
#if SD_ReadMultiBlock_EN
unsigned char SD_ReadMultiBlock(unsigned long blockaddr, unsigned long blocknum, unsigned char *recbuf)
{
    unsigned long i;
    unsigned char ret;
    
    if ((blockaddr + blocknum) > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;				/* 操作超出卡容量范围 operate over the card range */
    
	ret = SD_ReadMultipleBlock(blockaddr);			/* 读多块命令 read multiple blocks command */
	if (ret != SD_NO_ERR)
		return ret;
    
    for (i = 0; i < blocknum; i++)
    {												/* 读出数据 read data from sd card */
    	ret = SD_ReadBlockData(SD_BLOCKSIZE, recbuf);
    	if (ret == SD_NO_ERR)
       		recbuf = recbuf + SD_BLOCKSIZE;
    	else
    		return ret;
    }
 	 
 	return (SD_StopTransmission());				    /* 结束数据传输 stop transmission operation */
}

#endif

/********************************************************************************************************************
** 函数名称: unsigned char SD_WriteBlock()					Name:	  unsigned char SD_WriteBlock()
** 功能描述: 向SD卡中写入一个块						Function: write a block to sd card
** 输　  入: unsigned long blockaddr: 块地址				Input: 	  unsigned long blockaddr: address of block
			 unsigned char *sendbuf  : 发送缓冲区,长度512Bytes	  	  unsigned char *sendbuf  : the buffer of send,length is 512Bytes
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
unsigned char SD_WriteBlock(unsigned long blockaddr, unsigned char *sendbuf)
{
	unsigned char ret,tmp[2];
	
	if (blockaddr > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;							/* 操作超出卡容量范围 operate over the card range */
	
	if (SD_ChkCardWP() == 1)
		return SD_ERR_WRITE_PROTECT;							/* 卡有写保护 */
	
	ret = SD_WriteSingleBlock(blockaddr);						/* 写单块命令 write single block */
	if (ret != SD_NO_ERR)	
		return ret;
	
	ret = SD_WriteBlockData(0, SD_BLOCKSIZE, sendbuf);			/* 写入数据 write data */
 	if (ret == SD_NO_ERR)										/* 读Card Status寄存器, 检查写入是否成功 */
 	{															/* read Card Status register to check write wheather sucessfully */
 		ret = SD_ReadCard_Status(2,tmp);
 		if (ret != SD_NO_ERR)
 			return ret;											/* 读寄存器失败 read register fail */

 		if((tmp[0] != 0) || (tmp[1] != 0))
			ret = SD_ERR_WRITE_BLK; 			     			/* 响应指示写失败 response indicate write fail */
 	}
  
 	return ret;													/* 返回写入结果 return the result of writing */									
}

/**********************************************************************************************************************
** 函数名称: unsigned char SD_WriteMultiBlock()				Name:	  unsigned char SD_WriteMultiBlock()
** 功能描述: 向SD卡中写入多个块						Function: write multi blocks to sd card
** 输　  入: unsigned long blockaddr: 块地址				Input:	  unsigned long blockaddr: address of block
			 unsigned long blocknum : 块数量						  unsigned long blocknum : the numbers of block
			 unsigned char *sendbuf  : 发送缓冲区每块512字节    	  unsigned char *sendbuf  : the send buffer,each block length is 512Bytes
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
***********************************************************************************************************************/
#if SD_WriteMultiBlock_EN
unsigned char SD_WriteMultiBlock(unsigned long blockaddr, unsigned long blocknum, unsigned char *sendbuf)
{
	unsigned long i;
	unsigned char ret;
	
	if ((blockaddr + blocknum) > sds.block_num)	
		return SD_ERR_OVER_CARDRANGE;							/* 操作超出卡容量范围 operate over the card range */
		
	if (SD_ChkCardWP() == 1)
		return SD_ERR_WRITE_PROTECT;							/* 卡有写保护 */
	
	ret = SD_WriteMultipleBlock(blockaddr);						/* 写多块命令 write multiple blocks command */
	if (ret != SD_NO_ERR)
		return ret;

    for (i = 0; i < blocknum; i++)
    {															
 		ret = SD_WriteBlockData(1, SD_BLOCKSIZE, sendbuf);		/* 写入数据 write data */
 		if (ret == SD_NO_ERR)	
 			sendbuf = sendbuf + SD_BLOCKSIZE;
 		else
 		{														/* 写失败 write fail */
			SD_StopTransmission();								/* 停止数据传输 stop data transmission */	
			SD_WaitBusy(SD_WAIT_WRITE);							/* 等待 waiting */
			return ret;
		}
	}
   
    SD_StopMultiToken();										/* 发送数据停止令牌 send data stop token */
      
    ret = SD_WaitBusy(SD_WAIT_WRITE);							/* 等待写入的完成 wait for finishing writing */
    if (ret != SD_NO_ERR)
    	return SD_ERR_TIMEOUT_WRITE;
    
   	ret = SD_GetNumWRBlcoks(&i);								/* 读正确写入的块数 read the blocks that be written correctly */
   	if (ret != SD_NO_ERR)
   	  	return ret;
   	  	
   	if(i != blocknum) 
   	 	return SD_ERR_WRITE_BLKNUMS;							/* 正确写入块数错误 the blocks that be written correctly is error */
   	   	     
	return SD_NO_ERR;											/* 返回写入成功 return write sucessfully */			
}
#endif

/*********************************************************************************************************************
** 函数名称: unsigned char SD_EraseBlock()					Name:	  unsigned char SD_EraseBlock()
** 功能描述: 擦除SD卡中的块							Function: Erase the block of sd card
** 输　  入: unsigned long startaddr: 起始地址				Input:    unsigned long startaddr: start address
			 unsigned long endaddr  : 终止地址						  unsigned long endaddr  : end address