main.c

用max197对外部输入电压做采样

#include <reg52.h>
#define  WR197	RD	
#define  RD197	WR
#define  HBEN	T0
#define  CS 	T1
#define  DATA197 P2



//////////////////////
/////////////////////
///////液晶控制线宏定义
#define  E  INT0
#define  RS  RXD
#define  RW  TXD
///////////////////
//////////////////
//////////////////
code char table[]="The voltage is:";
code char ANSC[]={'0','1','2','3','4','5','6','7','8','9'};
char vdatatable[6]={' ','.',' ',' ',' ','V'};

void delay(unsigned char del)
{
	unsigned x,y;
	
	for(x=del;x>0;x--)
		for(y=110;y>0;y--);
}






void Write_Com(unsigned char com)
{
	
	RS=0;
	P0=com;
	delay(1);
	E=1;
	delay(1);	
	E=0;
}

void Write_Data(unsigned char date)
{
	RS=1;
	P0=date;
	delay(1);
	E=1;
	delay(1);
	E=0;
}



void  init()
{
    E=0;	
	RW=0;
	Write_Com(0x38);
	Write_Com(0x0c);
	Write_Com(0x06);
	Write_Com(0x01);
	
}



unsigned int write_command(unsigned char com)
{
	unsigned int Vdata;	
	CS=1;
	WR197=1;
	RD197=1;
	HBEN=1;
	CS=0;
	WR197=0;
	DATA197=com;
	WR197=1;
	DATA197=0xff;
	delay(40);
	RD197=0;
	Vdata=DATA197;
	HBEN=0;
	Vdata=(Vdata<<8)|DATA197;
	RD197=0;
	return 	Vdata;	
}






void main()
{
	unsigned int vdata;
	unsigned char vdata4,vdata3,vdata2,vdata1;
	unsigned char i=0;
	INT1=1;
	T1=1;	
	T0=1;
	init();
	Write_Com(0x80);
	while(table[i]!='\0')
		{
			Write_Data(table[i]);
			i++;
		}
//	P1=0xff;
	P2=0x00;
	P3=0;
//	P3=0xff;
loop:
	vdata=write_command(0x41);
	vdata4=(unsigned char)(vdata/1000);
	vdata3=(unsigned char)((vdata%1000)/100);
	vdata2=(unsigned char)((vdata%100)/10);
	vdata1=(unsigned char)(vdata%10);
	vdatatable[0]=ANSC[vdata4];
	vdatatable[2]='.';
	vdatatable[2]=ANSC[vdata3];
	vdatatable[3]=ANSC[vdata2];
	vdatatable[4]=ANSC[vdata1];
	Write_Com(0x80+0x45);
	for(i=0;i<6;i++)
		{
			Write_Data(vdatatable[i]);
			//delay(2);
		}
	delay(255);
	delay(255);
	delay(255);
	goto loop;
}