ad549.c

单片机开发板源程序 适合初学者 第五部分 报警产生器

/*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;
//AD(TLC549)引脚
sbit AD_CS=P3^7;
sbit AD_CK=P3^5;
sbit AD_OUT=P3^6;
//8字LED的连接方法
//P0.7	P.06	P0.5	P0.4	P0.3	P0.2	P0.1	P0.0
// H      G	 F	 E	 D	 C	 B 	 A

unsigned char code ledcode[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,	
			      0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};	//数码管段码表
unsigned char adbl,ledbai,ledshi,ledge,keytime;
unsigned char bdata myflag;
sbit keybit = myflag^0;

void time0(void);
void read_549(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('A');
	SendDataByte('D');
	SendDataByte('C');
	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;
	read_549();
	ledbai=(adbl/100)|0x30;
	ledshi=((adbl%100)/10)|0x30;
	ledge=(adbl%10)|0x30;
	dispdpbl();
}  

void read_549(void)
{
	unsigned char i;
	AD_CS=0;
	adbl=0x00;
	for(i=0;i<8;i++)
	{
		AD_CK=1;
		adbl=adbl<<1;
		if(AD_OUT==1) adbl++;
		AD_CK=0;
	}
	AD_CS=1;
}

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 dispdpbl(void)
{
	SendCommandByte(0x85);
	SendDataByte(ledbai);
	SendDataByte(ledshi);
	SendDataByte(ledge);
	
}