sdcmd.c

atmel de booloader 内有源代码 用blb编译

/*********************************************************************************************************
** Function name: SD_WriteSingleBlock
** Descriptions:  write single block command
**                写单块命令
** Input: 		  INT32U blockaddr: block address		INT32U blockaddr: block address
** Output: 		  0:   正确    >0:   错误码		  		0:  right		>0:  error code
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_WriteSingleBlock(INT32U blockaddr)
{
	return (SD_BlockCommand(CMD24, CMD24_R, blockaddr)); /* 写单块命令 command that write single block */
}




/*********************************************************************************************************
** Function name: SD_ReadOCR
** Descriptions:  read OCR register of card
**                读操作条件寄存器OCR
** Input: 		  INT8U ocrlen  : 寄存器长度(固定为4)	INT8U ocrlen  : len of register (fixed,is 4)
				  INT8U *recbuf : 接收缓冲区			INT8U *recbuf : receive buffer	
** Output: 		  0:   正确    >0:   错误码		  		0:  right		>0:  error code
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_ReadOCR(INT8U ocrlen, INT8U *recbuf)
{
	INT32U param = 0;
    INT8U response[6],tmp;

    tmp = SD_SendCommand(CMD55, param, CMD55_R, response);
    if (tmp != SD_NO_ERR)
    	return tmp;
    
    param = 0xF00000;										   /* 没有忙条件的OCR */
    tmp = SD_SendCommand(ACMD41, param, ACMD41_R, response);   /* 读 OCR 寄存器命令 read OCR register command */
    if (tmp != SD_NO_ERR)
       	return tmp;
                												
    for (tmp = 0; tmp < 4; tmp++)							   /* 从响应中取得OCR   get OCR from response */
    	recbuf[tmp] = response[tmp + 1];					   
    
    return SD_NO_ERR;
}


/*********************************************************************************************************
** Function name: MMC_ReadOCR
** Descriptions:  Read OCR register
** Input: 		  INT8U ocrlen  : the length of the OCR register
				  INT8U *recbuf : the content buffer of OCR register   
** Output: 		  NULL
** Created by:    Ming Yuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U MMC_ReadOCR(INT8U ocrlen, INT8U *recbuf)
{
	INT32U param = 0xF00000;								/* 没有忙条件的OCR */
    INT8U response[6],tmp;
					
    tmp = SD_SendCommand(CMD1, param, CMD1_R, response);	/* 读 OCR 寄存器命令 read OCR register command */
    if (tmp != SD_NO_ERR)
       	return tmp;
                												
    for (tmp = 0; tmp < 4; tmp++)
    	recbuf[tmp] = response[tmp + 1];					/* 复制OCR寄存器内容到接收缓冲区 */
    
    return SD_NO_ERR;
}


/*********************************************************************************************************
** Function name: SD_SetBusWidth
** Descriptions:  set Bus SD/MMC data bus Width(SD card is D0 ~ D3, MMC card is D0) 
** Input: 		  INT16U RCA	: the RCA of SD/MMC
				  INT32U bwidth : 1: D0 ~ D3 is valid   0: only D0 is valid   
** Output: 		  0:  right		>0:  error code
** Created by:    Ming Yuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_SetBusWidth(INT16U RCA, INT32U bwidth)
{
	INT32U param;
	INT8U response[6], ret;
	
    param = (INT32U)RCA << 16;
	
    ret = SD_SendCommand(CMD55, param, CMD55_R, response);
    if (ret != SD_NO_ERR)
    	return ret;	
	
	param = 0;
	if (bwidth == 1) 
		param = 0x02;		
	
	ret = SD_SendCommand(ACMD6, param, ACMD6_R, response); 		/* 发送写CSD寄存器命令 send command that write CSD */
	if (ret != SD_NO_ERR)
		return ret;
		        
    ret = SD_JudgeResult(&response[1]);							/* 判断命令是否正确执行 */
    if (ret != SD_NO_ERR)
    	return ret;   
   
    return SD_NO_ERR;
}

		/*********************************************************
		
		    	下面为一些数据传输函数  data transfer function
		
		**********************************************************/


/*********************************************************************************************************
** Function name: SD_ReadBlockData
** Descriptions:  read block data from card
**                从卡中读取数据块
** Input: 		  INT32U len    : 长度				    INT32U len    : length
				  INT8U *recbuf : 接收缓冲区			INT8U *recbuf : the buffer of receive
				  INT32U timeout: 超时时间				INT32U timeout: time out
** Output: 		  0:   正确    >0:   错误码		  		0:  right		>0:  error code
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_ReadBlockData(INT32U len, INT8U *recbuf, INT32U timeout)
{
	int i = 0;
	int cnt;
	INT32U tmp;
	INT32U stat = 0;
  
    /* recycle to receive data */				    	/* 循环接收数据 */
	while (i < len) 
	{
		stat = SDIDSTA;			                        /* read data status register */

		if (!card_insert) 
		{
			SDIDSTA = stat;
			return SD_ERR_NO_CARD;						/* 卡未插入,返回错误 card is not inserted, return error code */
		}
   
        /* 超时 timeout  */
		if (stat & SDIDSTA_TOUT) 
		{
			SDIDSTA = stat; /* clear */
			return SD_ERR_TIMEOUT_READ;
		}

		stat = SDIFSTA;                            		/* 读FIFO状态寄存器 read FIFO status register */
		if (stat & SDIFSTA_RX) 
		{
			cnt = (stat & SDIFSTA_CNT);             	/* 读FIFO 计数器 	read FIFO counter */
			while (cnt) 
			{
				tmp = SDIDAT;							/* 从FIFO中读出数据 read data from FIFO */
				recbuf[i] = (INT8U)(tmp); 
				recbuf[i + 1] = (INT8U)(tmp >> 8); 
				recbuf[i + 2] = (INT8U)(tmp >> 16); 
				recbuf[i + 3] = (INT8U)(tmp >> 24); 

				i += sizeof(INT32U);
				cnt -= sizeof(INT32U);
			}
		}
	}

	do 
	{
		stat = SDIDSTA;
		if (!card_insert) 
		{
			SDIDSTA = stat;
			return SD_ERR_NO_CARD;						/* 卡未插入,返回错误 card is not inserted, return error code */
		}        
	} while (!(stat & SDIDSTA_TOUT) && !(stat & SDIDSTA_DFIN));
        //不“超时”而且“数据未传输完成“时一直循环

	SDIDSTA = stat; 									/* clear data status register */
		
	return SD_NO_ERR; 
}


/*********************************************************************************************************
** Function name: SD_WriteBlockData
** Descriptions:  write block data to SD/MMC card
**                向SD/MMC卡写数据块
** Input: 		  INT8U bmulti  : 是否为多块操作1:是0:否   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
				  INT32U timeout: 超时时间			       INT32U timeout : time out
** Output: 		  0:   正确    >0:   错误码		  		0:  right		>0:  error code
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_WriteBlockData(INT8U bmulti, INT32U len, INT8U *sendbuf, INT32U timeout)
{
	int i = 0;
	int cnt;
	INT32U stat;

    /* recycle to write data to SD/MMC */			/* 下面的循环地往FIFO写入数据 */
	while (i < len) 
	{
		stat = SDIDSTA;                             /* 读数据状态寄存器  read data status register */
	
		if (!card_insert) 
		{
			SDIDSTA = stat;
			return SD_ERR_NO_CARD;					/* 卡未插入,返回错误 card is not inserted, return error code */
		}
		
		stat = SDIFSTA;                    			/* 读FIFO状态寄存器  read FIFO status register */
 		if (stat & SDIFSTA_TX) 
 		{ 							           		/* 如果TX FIFO有效   if TX FIFO is valid  */    
			cnt = SDI_MAX_TX_FIFO - (stat & SDIFSTA_CNT);
			                                		/* 64 - FIFO中的字节数 */
			while (cnt) 
			{
				SDIDAT = (sendbuf[i + 3] << 24) + (sendbuf[i + 2] << 16) +  
				     	 (sendbuf[i + 1] << 8) + sendbuf[i];  
				i += sizeof(INT32U);
				cnt -= sizeof(INT32U);
			}
		}
	}

	do 
	{
		stat = SDIDSTA;
		if (!card_insert)
		{
			SDIDSTA = stat;
			return SD_ERR_NO_CARD;					/* 卡未插入,返回错误  card is not inserted, return error code */
		}
	}while (!(stat & SDIDSTA_TOUT) && !(stat & SDIDSTA_DFIN));

	SDIDSTA = stat; 								/* clear data status register */
	
	return SD_NO_ERR;
}


/*********************************************************************************************************
**                            End Of File
**********************************************************************************************************/