sdcard.h

PDIUSB12+51做 U盘程序,可以将自己的系统单做U盘跟 电脑通信

#ifndef __SDCard_H__
#define __SDCard_H__

#include<reg52.h>

sbit SD_CS = P1^0;
sbit SD_MISO = P1^1;
sbit SD_MOSI = P1^2;
sbit SD_SCK = P1^3;


#define R1 1
#define R2 2
#define R3 3
#define R1b 4


#define RESPOND_TYPE_ERROR -1
#define RESPOND_ERROR -2
#define TIME_OUT      -3
#define CRC_ERROR -4 
#define ERROR -5
#define FAT_ERROR  -6
#define NO_ERROR 1
#define RET_NO_ERROR  2
//#define RET_ERROR 3
#define R1_NOERROR    3
#define NO_R1ERROR    4

#define RD_BLOCK_LEN 512
#define WR_BLOCK_LEN 512
#define DATA_ACCEPT 0x05



#define TIME_OUT_NUM 5000
//#include "stdmy.h"

//第一层：初始化sd卡
char InitSDToSpi();      //初始化sd卡为spi模式

char SetBlockLen(unsigned int length);    //设置每次读块长度



//第二层：从spi读写数据
char WriteToSPI(unsigned char databyte);

char RdFromSPI(unsigned char *pdatabyte);

//第三层：发送命令
char SendCmd(unsigned char cmdNo, unsigned char *para,unsigned char rettype, unsigned char *respond);

//第四层：从sd卡读写数据
char RDBlock(unsigned long  addr, char *rbuf);

char WriteBlock(unsigned long addr, char *wbuf);          


//辅助函数
void Assert_SPI_CS(char value);
//void WriteSquence1s(uint1 cycle);
char Reset_SD();
char Activate_SD();
char GenerateCRC(char cmdNo, char *para);
char Enable_CRC(unsigned char bEnable);

char InitialSD();
//extern int1 HaveActSd;


#endif