sdcard.c

ARM7 lpc2132+vs1003+sdcard 制作的 MP3 此程序在ADS1.2环境下编译

/****************************************Copyright (c)***********************************************
**                              		qsw
**                                      
**                                
**--------------File Info----------------------------------------------------------------------------
** File name:			sdhal.c
** Last modified Date:	2007.11.20
** Last Version:		V1.0
** Descriptions:		sd 卡驱动软件包: 硬件抽象层 ---- SPI1操作函数
**						Soft Packet of SD Card Driver: hard abstrast layer ---- function of SPI1 operation
**
**------------------------------------------------------------------------------------------------
** Created by:			qsw
** Created date:		2007.11.20
** Version:				V1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------
** Modified by:			
** Modified date:		
** Version:				
** Descriptions:		
**
**------------------------------------------------------------------------------------------------
** Modified by: 
** Modified date:
** Version:	
** Descriptions: 
**
**************************************************************************************************/
#include "main.h"

/* the information structure variable of SD Card*/
typedef struct SD_STRUCT
{	
	INT32U block_num;				/* 卡中块的数量 */
	INT32U block_len;				/* 卡的块长度(单位:字节) */
	INT32U erase_unit;				/* 一次可擦除的块个数 */
	
	INT32U timeout_read;			/* 读块超时时间(单位: 8 SPI01 clock) */
	INT32U timeout_write;			/* 写块超时时间(单位: 8 SPI01 clock) */
	INT32U timeout_erase;			/* 擦块超时时间(单位: 8 SPI01 clock) */
	
}sd_struct;

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

const   INT32U	time_unit[8] = {1000000000,100000000,10000000,1000000,100000,10000,1000,100};	/* 超时时间单位表(单位:0.000000001ns) timeout unit table */											 
const   INT8U	time_value[16] = {0,10,12,13,15,20,25,30,35,40,45,50,55,60,70,80};				/* 超时时间表 timeout value table */				                      
const	INT8U	r2w_fator[6] = {1,2,4,8,16,32};     											/* 超时时间因数表 timeout factor table */  

/**************************************************************************************************
**Name: 	  
**Function:   
**Input:	  
**Output:	  
**************************************************************************************************/
void SD_Power(void)
{
	SPI1_SCK_GPIO();	
	SPI1_SCK_OUT();
	SPI1_SCK_CLR();		
	
	SPI1_MOSI_GPIO();		
	SPI1_MOSI_OUT();
	SPI1_MOSI_CLR();		
	
    SPI1_CS_GPIO();	 		
	SPI1_CS_OUT();		
	SPI1_CS_CLR();
}
/**************************************************************************************************
**Name: 	  
**Function:   
**Input:	  
**Output:	  
**************************************************************************************************/
void SPI1_Init(uint8 speed)
{  
	SPI1_CS_GPIO();		
	SPI1_CS_OUT();
					
	PINSEL1 &= ~((0x03 << 2) + (0x03 << 4) + (0x03 << 6)); 
	PINSEL1 |=  (0x02 << 2) + (0x02 << 4) + (0x02 << 6);
	
 	SSPCPSR	= speed; 									//2-254 偶数				

	SSPCR0 	= (0x01 << 8) |              				// SCR  设置SPI时钟分频
              (0x00 << 7) |             				 	// CPHA 时钟输出相位,仅SPI模式有效 
              (0x01 << 6) |              				// CPOL 时钟输出极性,仅SPI模式有效
              (0x00 << 4) |              				// FRF  帧格式 00=SPI,01=SSI,10=Microwire,11=保留
              (0x07 << 0);               				// DSS  数据长度,0000-0010=保留,0011=4位,0111=8位,1111=16位

    SSPCR1 	= (0x00 << 3) |              				// SOD  从机输出禁能,1=禁止,0=允许
              (0x00 << 2) |              				// MS   主从选择,0=主机,1=从机
              (0x01 << 1) |              				// SSE  SSP使能,1=允许SSP与其它设备通信
              (0x00 << 0);               				// LBM  回写模式
             
    SSPCPSR	= 0x52;                     				// PCLK分频值
    SSPIMSC	= 0x07;                     				// 中断屏蔽寄存器
    SSPICR	= 0x03;                     				// 中断清除寄存器
}								
/**************************************************************************************************
**Name: 	  
**Function:   
**Input:	  
**Output:	  
**************************************************************************************************/
uint8 SPI1_SrByte(INT8U byte)
{
	SSPDR = byte;
	
	while(0 == (SSPSR & 0x10));				
										
	return(SSPDR);
}
/********************************************************************************************************************
** 函数名称: void SD_SPI1Delay()						Name:	  void SD_SPI1Delay()
** 功能描述: SPI1总线延时							Function: SPI1 Bus delay 
** 输　  入: INT8U value: 延时值,不超过255			Input:	  INT8U value : delay value,do not beyond 255
** 输 　 出: 无 									Output:   NULL
*********************************************************************************************************************/
void SD_SPI1Delay(INT8U value)
{
	INT8U i;
	
	for (i = 0; i < value; i++)
	{
		SPI1_SrByte(0xFF);							/* 发送0xFF clock out 0xFF */
	}
}
/**************************************************************************************************
** 函数名称: void SD_ChkCard()					Name:	  void SD_ChkCard()
** 功能描述: 检测卡是否完全插入					Function: check weather card is insert entirely
** 输　  入: 无									Input:	  NULL
** 输 　 出: 1: 卡完全插入	0: 卡没有完全插入   Output:	  1: insert entirely	0: not insert entirely
**************************************************************************************************/
INT8U SD_ChkCard(void)
{
	//if (SD_INSERT_STATUS() != 0)
	//	return 0;										/* 未完全插入 not insert entirely */
	//else
		return 1;										/* 完全插入 insert entirely */
}
#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: 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
********************************************************************************************************************/
INT8U SD_SendCmd(INT8U cmd, INT8U *param, INT8U resptype, INT8U *resp)
{
	INT32 i;
	INT32 rlen;
	INT8U tmp;
    
	SPI1_CS_CLR();
    SPI1_SrByte((cmd & 0x3F) |0x40);				 /* 发送命令头和命令字 send command header and word */
    
    for (i = 3; i >= 0; i--)
    {
        SPI1_SrByte(param[i]);						 /* 发送参数 send parameters */
    }
	#if SD_CRC_EN
		tmp = SD_GetCmdByte6((cmd & 0x3F) | 0x40, param);
		SPI1_SrByte(tmp);
	#else
   	    SPI1_SrByte(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:  
			SPI1_SrByte(0xFF);	
      		SPI1_CS_SET();						 
        	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 = SPI1_SrByte(0XFF);
        i++;
    }