cjsd.c

没有谁会编写低速模式的下的SDHC驱动

/**--------------File Info-------------------------------------------------------------------------------
** File name:			sddriver.c
** Last modified Date:	2005-1-6
** Last Version:		V1.0
** Descriptions:		sd 卡驱动软件包: SD卡物理层 用户API函数
**						Soft Packet of SD Card Driver: user API funciton
**
**------------------------------------------------------------------------------------------------------
** Created by:			gan peng
** Created date:		2005-1-6
** Version:				V1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:			
** Modified date:		
** Version:				
** Descriptions:		
**
**------------------------------------------------------------------------------------------------------
** Modified by: 
** Modified date:
** Version:	
** Descriptions: 
**
********************************************************************************************************/

#include "cjsd.h"


/* SD卡信息结构体变量 the information structure variable of SD Card */
sd_struct sds;			

/* 超时时间单位表(单位:0.000000001ns) timeout unit table */
const unsigned long time_unit[8] = {1000000000,100000000,10000000,
							 1000000,100000,10000,1000,100};

/* 超时时间表 timeout value table */							 
const unsigned char time_value[16] = {0,10,12,13,15,20,25,30,
                              35,40,45,50,55,60,70,80};
 
/* 超时时间因数表 timeout factor table */                              
const unsigned char r2w_fator[6] = {1,2,4,8,16,32};  



#if SD_CRC_EN
//X16 + X12 + X5 + 1 余式表
unsigned short const CRCTable[256]={0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,
							0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,
							0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6,
							0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,
							0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,
							0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d,
							0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4,
							0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,
							0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,
							0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b,
							0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12,
							0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,
							0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,
							0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49,
							0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,
							0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,
							0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f,
							0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067,
							0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,
							0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,
							0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d,
							0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405,
							0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,
							0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634,
							0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab,
							0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,
							0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,
							0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92,
							0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9,
							0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,
							0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,
							0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0
						   };

/********************************************************************************************************************
** 函数名称: unsigned char SD_GetCRC16()					Name:	  unsigned char SD_GetCRC16()
** 功能描述: 计算CRC16								Function: calculate CRC16 
** 输　  入: unsigned char *pSource: 数据					Input:    unsigned char *pSource: data
			 unsigned short len    : 长度							  unsigned short len    : len
** 输 　 出: CRC16码								Output:	  CRC16 code
********************************************************************************************************************/
unsigned short SD_GetCRC16(unsigned char *pSource, unsigned short len)
{
	
	unsigned short result = 0;	
	
	return result;
}

/*******************************************************************************************************************
** 函数名称: unsigned char SD_GetCmdByte6()					Name:	  unsigned char SD_GetCmdByte6()
** 功能描述: 获取SD卡命令的CRC7						Function: get the CRC7 of the command of SD card
** 输　  入: unsigned char cmd   : 命令						Input:    unsigned char cmd   :	command
			 unsigned char *param: 命令的参数,长度为4字节			  unsigned char *param: the param of command,length is 4 bytes
** 输 　 出: CRC7码									Output:	  CRC7 code
********************************************************************************************************************/
unsigned char SD_GetCmdByte6(unsigned char cmd, unsigned char *param)
{
	unsigned char i, j;
	unsigned char reg = 0;
	unsigned char array[5];
	
	array[0] = cmd;
	for (i = 1; i < 5; i++)						/* 将参数的顺序重新排列 */
		array[i] = param[4 - i];
	
	for (i = 0; i < 5; i++)						/* 计算5个字节的CRC7 */
	{
	    for (j = 0; j < 8; j++)
	    {
			reg <<= 1;
			reg ^= ((((array[i] << j) ^ reg) & 0x80) ? 0x9 : 0);
	    }
	}
	
	return ((reg << 1) + 0x01) ;				/* 计算结果的CRC7左移一位,并将最低位置1 */
}
#endif


                    
 
 

/********************************************************************************************************************
** 函数名称: unsigned char SD_SendCmd()						Name:	  unsigned char 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: unsigned char cmd	    : 命令字				Input:	  unsigned char cmd	    : command byte	
			 unsigned char *param	: 命令参数,长度为4字节			  unsigned char *param	: command parameter,length is 4 bytes  
			 unsigned char resptype : 响应类型						  unsigned char resptype: response type
			 unsigned char *resp	: 响应,长度为1-5字节			  unsigned char *resp	: response,length is 1-5 bytes
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
********************************************************************************************************************/
unsigned char SD_SendCmd(unsigned char cmd, unsigned char *param, unsigned char resptype, unsigned char *resp)
{
	long i,rlen;
	unsigned char tmp;
    
	SPI_CS_Assert();
   
    SPI_SendByte((cmd & 0x3F) | 0x40);				 /* 发送命令头和命令字 send command header and word */
    
    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: unsigned char *parameter: 字节参数缓冲区		Input:	  unsigned char *parameter: the buffer of bytes parameter
			 unsigned long value    : 32位参数						  unsigned long value    : 32bit parameter
** 输 　 出: 无										Output:	  NULL
*********************************************************************************************************************/
void SD_PackParam(unsigned char *parameter, unsigned long value)
{
    parameter[3] = (unsigned char)(value >> 24);
    parameter[2] = (unsigned char)(value >> 16);
    parameter[1] = (unsigned char)(value >> 8);
    parameter[0] = (unsigned char)(value);
}

/********************************************************************************************************************
** 函数名称: unsigned char SD_BlockCommand()				Name:	  unsigned char SD_BlockCommand()
** 功能描述: 块命令									Function: command about block operation
** 输　  入: unsigned char cmd	     : 命令字				Input:	  unsigned char cmd	      : command byte 
			 unsigned char resptype  : 响应类型						  unsigned char resptype  : response type
			 unsigned long parameter: 块操作参数			 		  unsigned long parameter: parameter of block operation
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
*********************************************************************************************************************/
unsigned char SD_BlockCommand(unsigned char cmd, unsigned char resptype, unsigned long parameter)
{
	unsigned char 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 */	
								 		 /* 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: unsigned char SD_ResetSD()						Name:	  unsigned char 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
*********************************************************************************************************************/
unsigned char SD_ResetSD(void)
{
	unsigned char 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: unsigned char SD_ReadCSD()						Name:	  unsigned char SD_ReadCSD()
** 功能描述: 读SD卡的CSD寄存器						Function: read CSD register of sd card 
** 输　  入: unsigned char csdlen  : 寄存器长度(固定为16)			  unsigned char csdlen  : 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
*********************************************************************************************************************/
unsigned char SD_ReadCSD(unsigned char csdlen, unsigned char *recbuf)
{
    unsigned char param[4] = {0,0,0,0},resp,ret;