sdcmd.c

在s3c44b0下利用SD卡进行WAV文件（FAT16格式）播放的源程序

/****************************************Copyright (c)**************************************************
**                               Guangzhou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			sdcmd.c
** Last modified Date:	2005-3-11 
** Last Version:		V2.0
** Descriptions:		SD/MMC 读写模块: 物理层 ---- SD/MMC卡SPI模式支持的命令 
**						Soft Packet of SD/MMC Card: commands that SD/MMC card supported in SPI mode
**
**------------------------------------------------------------------------------------------------------
** Created by:			Ming Yuan Zheng
** Created date:		2005-1-6
** Version:				V1.0
** Descriptions:		SD/MMC 读写模块: 物理层 ---- SD卡SPI模式支持的命令 
**
**------------------------------------------------------------------------------------------------------
** Modified by:			Ming Yuan Zheng
** Modified date:		2005-3-11
** Version:				V2.0	
** Descriptions:		增加了对MMC卡的支持,并使用本模块既可以运行于前后台系统,也可运行于uCOS-II中.
**
**------------------------------------------------------------------------------------------------------
** Modified by: 
** Modified date:
** Version:	
** Descriptions: 
**
********************************************************************************************************/

//#include "config.h"
#include "sdcmd.h"
#include "sddriver.h"
#include "sdconfig.h"
#include "\target\44b.h"



#if SD_CRC_EN
//X16 + X12 + X5 + 1 余式表
INT16U 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: INT8U SD_GetCRC16()					Name:	  INT8U SD_GetCRC16()
** 功能描述: 计算CRC16								Function: calculate CRC16 
** 输　  入: INT8U *pSource: 数据					Input:    INT8U *pSource: data
			 INT16U len    : 长度							  INT16U len    : len
** 输 　 出: CRC16码								Output:	  CRC16 code
********************************************************************************************************************/
INT16U SD_GetCRC16(INT8U *pSource, INT16U len)
{
	INT16U i;
	INT16U result = 0;

	for (i = 0; i < len; i++)
	    result = (result << 8) ^ (INT16U)CRCTable[(result >> 8) ^ *pSource++];
	
	return result;
}

/*******************************************************************************************************************
** 函数名称: INT8U SD_GetCmdByte6()					Name:	  INT8U 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: INT8U cmd   : 命令						Input:    INT8U cmd   :	command
			 INT8U *param: 命令的参数,长度为4字节			  INT8U *param: the param of command,length is 4 bytes
** 输 　 出: CRC7码									Output:	  CRC7 code
********************************************************************************************************************/
INT8U SD_GetCmdByte6(INT8U cmd, INT8U *param)
{
	INT8U i, j;
	INT8U reg = 0;
	INT8U 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: void SD_HardWareInit()				Name:	  void SD_HardWareInit()
** 功能描述: 初始化访问SD卡的硬件条件			Function: initialize the hardware condiction that access sd card
** 输　  入: 无									Input:	  NULL
** 输 　 出: 无									Output:	  NULL
********************************************************************************************************************/
void SD_HardWareInit(void)
{ 
	//GPG1:OutputTXD; GPF4:InputRXD;GPF3:CLKoutput;GPB10(nGCS5):CS;
	unsigned long int a,b,c,d,e,f;
	a=rPCONF&=~((3<<6)|(3<<8));
    b=rPCONF|=(1<<6)|(0<<8);
	c=rPUPF&=~(1<<3);
	
	d=rPCONG&=~(3<<2);
	e=rPCONG|=(1<<2);
	
	f=rPCONB &= ~(1<<10);
}


/*******************************************************************************************************************
** 函数名称: void SPI_SendByte()				Name:	  void SPI_SendByte()
** 功能描述: 通过SPI接口发送一个字节			Function: send a byte by SPI interface
** 输　  入: INT8U byte: 发送的字节				Input:	  INT8U byte: the byte that will be send
** 输 　 出: 无									Output:	  NULL
********************************************************************************************************************/
void SPI_SendByte(INT8U dat)
{
 	int i,tmptxd;

	tmptxd=dat;
		
	for(i=0;i<8;i++)
	{
     	CLR_SPICLK;
			  
		if(tmptxd&(0x80>>i))//MSB
		{
			SET_SPITXD;
		}
		else
		{
			CLR_SPITXD;
		}		
		SET_SPICLK;
	}
}


/*******************************************************************************************************************
** 函数名称: INT8U SPI_RecByte()				Name:	  INT8U SPI_RecByte()
** 功能描述: 从SPI接口接收一个字节				Function: receive a byte from SPI interface
** 输　  入: 无									Input:	  NULL
** 输 　 出: 收到的字节							Output:	  the byte that be received
********************************************************************************************************************/
INT8U SPI_RecByte(void)
{
	int i,tmp,tmprxd=0;
		
	for(i=0;i<8;i++)
		{
         	CLR_SPICLK;
         	
            tmp=READ_SPIRXD;
	        tmprxd|=tmp>>i;
		
			SET_SPICLK;
		}
	return tmprxd;
}


/*******************************************************************************************************************
** 函数名称: void SPI_CS_Assert()				Name:	  void SPI_CS_Assert()
** 功能描述: 片选SPI从机						Function: select the SPI slave 
** 输　  入: 无									Input:	  NULL
** 输 　 出: 无									Output:	  NULL
********************************************************************************************************************/
void SPI_CS_Assert(void)
{
	SPI_CS_CLR();			   					/* 片选SPI从机  select the SPI slave */  
}


/*******************************************************************************************************************
** 函数名称: void SPI_CS_Deassert()				Name:	  void SPI_CS_Deassert()
** 功能描述: 不片选SPI从机						Function: not select the SPI slave 
** 输　  入: 无									Input:	  NULL
** 输 　 出: 无									Output:	  NULL
********************************************************************************************************************/
void SPI_CS_Deassert(void)
{
	SPI_CS_SET();			    				/* 不片选SPI从机  not select the SPI slave */
}




/********************************************************************************************************************
** 函数名称: INT8U SD_SendCmd()						Name:	  INT8U 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: INT8U cmd	    : 命令字				Input:	  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1-5字节			  INT8U *resp	: response,length is 1-5 bytes
** 输 　 出: 0:   正确    >0:   错误码		  		Output:	  0:  right		>0:  error code
例：         SD_BlockCommand(CMD17, CMD17_R, blockaddr)
********************************************************************************************************************/
INT8U SD_SendCmd(INT8U cmd, INT8U *param, INT8U resptype, INT8U *resp)
{
	INT32 i,rlen;
	INT8U 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: