sdcmd.c

atmel de booloader 内有源代码 用blb编译

/****************************************Copyright (c)**************************************************
**                               Guangzhou ZHIYUAN electronics Co.,LTD.
**                                     
**                                 http://www.zyinside.com
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: 				sdcmd.c
** Last modified Date: 		2006.01.09
** Last Version:			V1.0		
** Description: 			sd/mmc 卡支持的命令(SD模式)
**                          commands that sd/mmc card supported
**------------------------------------------------------------------------------------------------------
** Created By: 				MingYuan Zheng 郑明远
** Created date: 			2006.01.09
** Version: 				V1.0
** Descriptions:			The original version 初始版本
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Description:
**
********************************************************************************************************/

#include "config.h"


/*********************************************************************************************************
** Function name: SD_SendCommand
** Descriptions:  send command to the card,and get a response
**                向卡发送命令,并取得响应	
** Input: 		  INT8U cmd	    : 命令字					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0-17字节		INT8U *resp	  : response,length is 0-17 bytes
** 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_SendCommand(INT8U cmd, INT32U param, INT8U resptype, INT8U *resp)
{
	INT32U resp_len, stat = 0;
    
	stat = SDICCON_START | ((cmd & 0x3F) | 0x40);	  /* 发送命令头和命令字 send command header and word */
	SDICARG = param;
       												  /* 发送参数 send parameter */
    resp_len = 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 R0:
    		 resp_len = 0;							 	
  			 break;
  			
  		case R1:
  		case R1B:
  		case R3:
   		case R6:
  			 stat |= SDICCON_WRSP;                    /* SDICCON_WRSP:等待响应. SDICCON_WRSP: must wait for response */
  			 resp_len = 6;
  			 break;
         		 
    	case R2: 
    	     stat |= SDICCON_WRSP;
    	     stat |= SDICCON_LRSP;		              /* SDICCON_LRSP:长响应. SDICCON_LRSP: long response */
       		 resp_len = 17;
       		 break;
       		 
    	default:
           	 return SD_ERR_CMD_RESPTYPE;			  /* 返回命令响应类型错误 return error of command response type */
    		 break;
    }
    SDICCON = stat;									  /* 向SD/MMC卡发送命令   send command to sd/mmc card */

	/* no response */
    if (resp_len == 0)
    {
		do
		{											  /* recycle until the command have been sent */
			stat = SDICSTA;
			if (!card_insert)
			{										  /* 卡被拔出 card is removed */
				SDICSTA = stat;
				return SD_ERR_NO_CARD;
			}			
		}while (!(stat & SDICSTA_SENT));   
		
		SDICSTA = stat;							      /* clear bits */    
    	return SD_NO_ERR;							  /* 返回执行成功 return perform sucessfully */
    }

	/* there is response */
	while(1) 
	{
		stat = SDICSTA;
		if (stat & SDICSTA_TOUT)
		{											  /* time is out */
			SDICSTA = stat; 						  /* clear bits */
			return SD_ERR_CMD_TIMEOUT;				  /* 返回命令超时 return response timeout of command */
		}
		
		if (stat & SDICSTA_RSP)						  /* 接收到响应 receive the response */
			break;
			
		if (!card_insert)
		{											  /* 卡被拔出 card is removed */		
			SDICSTA = stat;
			return SD_ERR_NO_CARD;
		}			
	}
	SDICSTA = stat;					   				  /* clear bits */ 

	/* read the response */
	if (resp_len == 6)
	{
		*resp = (INT8U)(SDIRSP1 >> 24); 
		word_to_byte(SDIRSP0, resp + 1);
	}
	else
	{
		word_to_byte(SDIRSP0, resp + 12);
		word_to_byte(SDIRSP1, resp + 8);
		word_to_byte(SDIRSP2, resp + 4);
		word_to_byte(SDIRSP3, resp);
    }    
    	   
    return SD_NO_ERR;								   /* 返回执行成功 return perform sucessfully */
}



/*********************************************************************************************************
** Function name: word_to_byte
** Descriptions:  change 32bit value to bytes form
**                将32位的参数转为字节形式	
** Input: 		  INT32U value	: 被转换的字				INT32U value  : the word changed
				  INT8U *pdst	: 目标缓冲区,长度为4字节    INT8U *param  : target buffer,length is 4 bytes
** Output: 		  NULL 
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void word_to_byte(INT32U value, INT8U *pdst)
{
    pdst[3] = (INT8U)(value >> 24);
    pdst[2] = (INT8U)(value >> 16);
    pdst[1] = (INT8U)(value >> 8);
    pdst[0] = (INT8U)(value);
}


/*********************************************************************************************************
** Function name: SD_JudgeResult
** Descriptions:  Judge wheather response of R0 is right 
**                向卡发送命令,并取得响应	
** Input: 		  INT8U *CardStatus: R0中的Card Status域	  INT8U *CardStatus: Card Status field of R0
** 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_JudgeResult(INT8U *CardStatus)
{
	if ((CardStatus[0] & CARDSTATUS_ERR_MSK0) != 0) 
		return SD_ERR_CMD_RESP;
		
	if ((CardStatus[1] & CARDSTATUS_ERR_MSK1) != 0) 
		return SD_ERR_CMD_RESP;
		
	if ((CardStatus[2] & CARDSTATUS_ERR_MSK2) != 0) 
		return SD_ERR_CMD_RESP;

	if ((CardStatus[3] & CARDSTATUS_ERR_MSK3) != 0) 
		return SD_ERR_CMD_RESP;

	return SD_NO_ERR;
}


/*********************************************************************************************************
** Function name: SD_ResetSD
** Descriptions:  Reset SD/MMC card
** Input: 		  NULL
** Output: 		  0:  right		>0:  error code
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_ResetSD(void)
{
	INT32U param = 0;
	INT8U resp;
	
    return (SD_SendCommand(CMD0, param, CMD0_R, &resp));	/* 复位命令 command that reset card */
}


/*********************************************************************************************************
** Function name: SD_BlockCommand
** Descriptions:  command of block operation
**                块命令
** Input: 		  INT8U cmd	      : 命令字				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
** 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_BlockCommand(INT8U cmd, INT8U resptype, INT32U parameter)
{
	INT8U response[6],ret;
	
	parameter <<= SD_BLOCKSIZE_NBITS;					 /* 调整地址:左移9位     adjust address: move 9 bits left */

	ret = SD_SendCommand(cmd, parameter, resptype, response);
	if (ret != SD_NO_ERR)
	   	 return ret;							 		 /* 结束数据传输失败     stop transmission operation fail */
	
	return (SD_JudgeResult(&response[1]));				 /* 返回结果 return Result */
}


/*********************************************************************************************************
** Function name: SD_ReadAllCID
** Descriptions:  read CID register of card
**                读卡的CID寄存器
** Input: 		  INT8U cidlen  : 寄存器长度(固定为16)	INT8U cidlen  : the length of register (fixed,is 16)
				  INT8U *recbuf : 接收缓冲区		    INT8U *recbuf : receive buffer	
** Output: 		  0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
** Created by:    MingYuan Zheng 郑明远 
** Created Date:  2006-01-09 
**-------------------------------------------------------------------------------------------------------
** Modified by:
** Modified Date: 
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
INT8U SD_ReadAllCID(INT8U cidlen, INT8U *recbuf)
{
	INT32U param = 0;
    INT8U response[17],tmp;
 
 	tmp = SD_SendCommand(CMD2, param, CMD2_R, response); /* 读CID寄存器命令 command that read CID register */
 	if (tmp != SD_NO_ERR)
     	return tmp;
 
 	for (tmp = 0; tmp < 16; tmp++)						 /* 从响应中取得CID的内容 get CID from response */
 		recbuf[tmp] = response[tmp];
	
	return SD_NO_ERR;
}


/*********************************************************************************************************
** Function name: SD_GetRCA
** Descriptions:  get RCA(relative address) of card
**                获得卡的RCA(相对地址)
** Input: 		  INT16U *RCA   : RCA接收缓冲(长度1)	INPUT:	  INT16U *RCA  : rec buffer of RCA(length: 1)
** Output: 		  0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code