sdcardread.h

单片机51系列

#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
sfr AUXR =0x8e;
//pin脚定义
//SD卡使用SPI模式进行读写
//1-:
//2-CS  ->P3.2
//3-MOSI->P3.3
//4-+3v3
//5-CLK ->P3.4
//6-vss
//7-MISO->P3.5
//8-:
sbit CS =P3^2;
sbit SI =P3^3;
sbit SCK=P3^4;
sbit SO =P3^5;

#define CS_SD_EN    (CS=0)      //为低时表示片选
#define CS_SD_DIS   (CS=1)      //disable     
#define SCK_SD_LOW  (SCK=0)     //low
#define SCK_SD_HIGH (SCK=1)     // SCK = 1
#define SI_SD_LOW   (SI=0)      //(SI,SO均相对SSD)
#define SI_SD_HIGH  (SI=1)      //SI=1

uchar publicdata[100];
uchar Timeout;
uchar cou;
uchar act;
uchar DelayTime=10;