key.c

来自「用单片机实现LCD显示字符和图形」· C语言 代码 · 共 71 行

#include "reg51.h"
#include "declare.h"
#include "key.h"
unsigned int total_t1,total_t2,total_t3,total_t4;
char  select_t=0;
//-------------------------键盘程序--------------------------
///----------------P1.0做加法-------------------
//----------------P1.1做减法-------------------
//----------------P1.2用求余的方法来选择T1,T2,T3,T4----------*/
extern char  Key_read ()
	{
	P1=0XFF;
	delay_nus(1);
	if(P1==0xfb)	  //------------选择T判断条件-----
	{
	select_t++;
	if(select_t>3)	 select_t=0;
	}
//-------t1,t2,3,t4,递增条件P1=0XFE----------------------------------
	if((P1==0XFE)&&(select_t%4==0))   
	 	{
		delay_nus(5);
		total_t1++;
		return  total_t1;
		 }
	else if ((P1==0XFE)&&(select_t%4==1)) 
		{
		delay_nus(5);
		total_t2++;
		return  total_t2;
		 }
	else if ((P1==0XFE)&&(select_t%4==2)) 
		{
		delay_nus(5);
		total_t3++;
		return  total_t3;
		 }
	else if ((P1==0XFE)&&(select_t%4==3)) 
		{
		delay_nus(5);
		total_t4++;
		return  total_t4;
		 }
//-------t1,t2,3,t4,递减条件P1=0XFE----------------------------------
	if((P1==0XFD)&&(select_t%4==0))   
	 	{
		delay_nus(5);
		total_t1--;
		return  total_t1;
		 }
	else if ((P1==0XFD)&&(select_t%4==1)) 
		{
		delay_nus(5);
		total_t2--;
		return  total_t2;
		 }
	else if ((P1==0XFD)&&(select_t%4==2)) 
		{
		delay_nus(5);
		total_t3--;
		return  total_t3;
		 }
	else if ((P1==0XFD)&&(select_t%4==3)) 
		{
		delay_nus(5);
		total_t4--;
		return  total_t4;
		 }
	//return  total_t1;
	}