I^2C.zip_IIC 测试

#include<reg52.h> #define unchar unsigned char sbit sda=P2^0; sbit scl=P2^1; unchar z,flag,flag_a,date,address,a,b,sheng,jiang; sbit up=P3^7; sbit down=P3^6; sbit x=P1^0;//升按键 sbit y=P1^1;//降按键 void delay(); void start() { scl=1; sda=1; delay(); sda=0; delay(); scl=0; //flag=1; } void stop() { scl=1; sda=0; delay(); sda=1; delay(); scl=0; //flag=0; } void answer() { sda=0; delay(); scl=1; delay(); scl=0; delay(); sda=1; } void _answer1() { sda=1; delay(); scl=1; delay(); scl=0; delay(); } void jcanswer() { unchar i,j; while(1) { if(scl==1) { while(i<255) { i++; if(sda==0) {flag_a=1;i=255;j=1;} } if(!j) { flag_a=0; i=0; } j=0; } } } void init() { sda=1; scl=1; flag=0; address=0; sheng=0; jiang=0; up=0; down=0; } void delay() { ; ; ; } void delay_1(unchar z) { unchar i,j; for(i=z;i>0;i--) for(j=110;j>0;j--); } void jcstart() { if((scl==1)&&(sda==1)) { if(sda==0) flag=1; } } void jcstop() { if((scl==1)&&(sda==0)) { if(sda==1) flag=0; } } void write(unchar date) { unchar i,j; //start(); delay(); j=date; for(i=0;i<8;i++) { j=j<<1; scl=0; delay(); sda=CY; delay(); scl=1; while(!scl); delay(); } scl=0; delay(); sda=1; delay(); } unchar read() { unchar i,k; scl=0; sda=1; delay(); for(i=0;i<8;i++) { while(!scl); delay(); k=(k<<1)|sda; scl=0; delay(); } return k; } void address1() { if(0x00==read()) address=1; } void anjian() { if(P1^0==0) { delay_1(5); if(x==0) { sheng=1;y=1;} while(P1^0==0); } if(P1^1==0) { delay_1(5); if(y==0) { jiang=1;x=1;} while(P1^1==0); } } void main() { init(); while(1) { jcstart(); address1(); jcstop(); anjian(); if(address&&flag) { answer(); a=read(); //上还是下 answer(); b=read(); //多少层 _answer1(); } if(sheng&&jiang) { start(); write(0x00); //向上位机发信息（地址） jcanswer(); if(flag_a) { } } } }