2402.c

这是一个带SIS仿真电路的PIC驱动程序,极易修改应用.///*功能是检测2402能否正常读取数据

///*功能是检测2402能否正常读取数据，先写入数组中的代码，
//然后根据变量i的变化取出数据，并显示在屏上*/


#include <pic.h>
#define uchar unsigned char
#define uint unsigned int
#define ulint unsigned  long int
#define flash()  asm("nop")

#define scl  RC3 
#define sda  RC5 

uchar  disp[12]={//0xD7,0x81,0x5D,0x9D,0x8B,0x9E,0xDE,0x85, 0xDF,0x9F,0x11,0x12,};
	               0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,0X90,0xFF,};
__CONFIG(0x3fa2);

uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
void x24c02_write(uchar address,uchar info); //向24c02的address地址中写入一字节数据info
void x24c02_init(); //24c02初始化子程序
void delay1(uchar x);
void x24c01_init();
void start();
void stop();
void writex(uchar j);
uchar readx();
void clock();

void delay1(uchar x)
{
uchar i,u;
for(i=0;i<x;i++)
u=~u;
}


void x24c02_init()
{
scl=1; flash(); sda=1; flash();
}

void start()
{
sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
}

void stop()
{
sda=0; flash(); scl=1; flash(); sda=1; flash();
}

void writex(uchar j)
{
uchar i,temp;
temp=j;
for (i=0;i<8;i++){
temp=temp<<1; scl=0; flash(); 
sda=CARRY;
flash(); scl=1; flash();
}
scl=0; flash(); sda=1; flash();
}

uchar readx()
{
uchar i,j,k=0;
TRISC5=1;flash();scl=0; flash();//sda=1;
for (i=0;i<8;i++){
flash(); scl=1; flash();
if (sda==1) j=1;
else j=0;
k=(k<<1)|j; scl=0;
}
TRISC5=0;flash(); return(k);
}

void clock()
{
uchar i=0;
TRISC5=1;flash();scl=1; flash();
while ((sda==1)&&(i>250))i++;
TRISC5=0;flash();scl=0; flash();
}

uchar x24c02_read(uchar address)
{
uchar i;
start(); writex(0xa0);
clock(); writex(address);
clock(); start();
writex(0xa1); clock();
i=readx(); stop();
delay1(10);
return(i);
}

void x24c02_write(uchar address,uchar info)
{
//GIE=0;
start(); writex(0xa0);
clock(); writex(address);
clock(); writex(info);
clock(); stop();
//GIE=1;
delay1(50);
}

///*****************************************//

void main(void)
{ uchar i=0;
  
   uint g;

TRISA=0x00;
TRISB=0x00;
TRISC=0x00;
PORTB=0XFF;
PORTA=0XFF;
x24c02_init(); //24c02初始化子程序
for(i=0;i<10;i++)
{	
   x24c02_write(i,disp[i]); delay1(100);
}
 while(1)
 {for(i=0;i<10;i++)
    {					 
     PORTB=x24c02_read(i);
     //h=disp[i];
     for(g=0;g<500;g++)delay1(200); 
     }
     	
   }
}