jdq.c.bak

单片机开发板源程序适合初学者 第六部分 继电器输出控制

/*实验名称：按加减键实现内部加减 0.01
  功能：数码显示0.20---2.00
  作者：http://www.mcuprog.com
        05-02-01
*/
#include <reg51.h>
//LCD的口线
sbit E=P2^2;
sbit RW=P2^1;
sbit RS=P2^0;
sbit K1= P1^0;
sbit JDQ = P3^6;

unsigned char keytime;
unsigned char bdata myflag;
sbit keybit = myflag^0;
sbit outedbit = myflag^1;

void time0(void);

void Delay(unsigned int t);
void SendCommandByte(unsigned char ch);
void SendDataByte(unsigned char ch);
void InitLcd(void);
void dispdpbl(void);

void main(void)
{
	InitLcd();
	myflag=0x00;
	keytime=4;		//20MS扫一次按键
	SendCommandByte(0x80);
	Delay(2);
	SendDataByte('S');
	SendDataByte('T');
	SendDataByte('A');
	SendDataByte('T');
	SendDataByte('E');
	SendDataByte(':');
	TH0=0xee;		//定时5MS
	TL0=0x00;
	TMOD=0x01;
	TR0=1;
	IE=0x82;
	while(1)
	{}	
}	

void time0(void) interrupt 1
{
	TH0=0xee;
	TL0=0x00;
	keytime--;
	if(keytime==0)
	{
		keytime=4;
		if(K1==0)
		{
			if(keybit==0)
			{
				keybit=1;
				outedbit=!outedbit;
				JDQ=!JDQ;
			}	
		}	
		else{keybit=0;}	
	}	
	dispstate();
}  



void Delay(unsigned int t)   // delay 40us
{
 for(;t!=0;t--) ;
}
//=============================================
void SendCommandByte(unsigned char ch)
{
   RS=0;
   RW=0;
   P0=ch;
   E=1;
    Delay(1);
   E=0;
   Delay(100);  //delay 40us
}
//-------------------------------------------------------
void SendDataByte(unsigned char ch)
{  RS=1;
   RW=0;
   P0=ch;
   E=1;
       Delay(1);
   E=0;
   Delay(100); //delay 40us
}
//-------------------------------------------------
void InitLcd(void)
{SendCommandByte(0x30);
 SendCommandByte(0x30);
 SendCommandByte(0x30);
 SendCommandByte(0x38);	//设置工作方式
 SendCommandByte(0x0c); //显示状态设置
 SendCommandByte(0x01); //清屏
 SendCommandByte(0x06); //输入方式设置
}

void dispstate(void)
{
	SendCommandByte(0x87);
	if(outedbit==0)
	{
		SendDataByte('C');
		SendDataByte('L');
		SendDataByte('O');
		SendDataByte('S');
		SendDataByte('E');
	}
	else
	{
		SendDataByte('O');
		SendDataByte('P');
		SendDataByte('E');
		SendDataByte('N');
		SendDataByte(' ');
	}		
	
}