keyboard.c

来自「以C8051F020单片机做的多功能计数器」· C语言 代码 · 共 86 行

#include "keyBoard.h"



//4*4按键排列
const unsigned char keyBoard[4][4]={ZHOUQI,PINLV,JIANGE,OK,
								HISTORY,UP,DOWN,CANCEL,
								Hz1,Hz2,Hz3,Hz4,
								Hz5,Hz6,Hz7,SIXTEEN
							 };

//扫描键盘函数,返回按下键的值,不消抖
unsigned char KeyScan0()
{
	KEY_PORT=0xff;
	Delay20us(2);

	row1=0;
	Delay20us(2);
	if(line1==0)
		return keyBoard[0][0];
	if(line2==0)
		return keyBoard[1][0];
	if(line3==0)
		return keyBoard[2][0];
	if(line4==0)
		return keyBoard[3][0];
	row1=1;
	Delay20us(2);

	row2=0;
	Delay20us(2);
	if(line1==0)
		return keyBoard[0][1];
	if(line2==0)
		return keyBoard[1][1];
	if(line3==0)
		return keyBoard[2][1];
	if(line4==0)
		return keyBoard[3][1];
	row2=1;
	Delay20us(2);

	row3=0;
	Delay20us(2);
	if(line1==0)
		return keyBoard[0][2];
	if(line2==0)
		return keyBoard[1][2];
	if(line3==0)
		return keyBoard[2][2];
	if(line4==0)
		return keyBoard[3][2];
	row3=1;
	Delay20us(2);

	row4=0;
	Delay20us(2);
	if(line1==0)
		return keyBoard[0][3];
	if(line2==0)
		return keyBoard[1][3];
	if(line3==0)
		return keyBoard[2][3];
	if(line4==0)
		return keyBoard[3][3];
	row4=1;
	Delay20us(2);

	return NOKEY;
}

unsigned char KeyScan()	//对按键进行消抖
{
	unsigned char a,b;
	a=KeyScan0();
	Delayms(100);
	b=KeyScan0();
	if(a!=b||a==NOKEY||b==NOKEY)
	{
		return NOKEY;
	}
	Delayms(150);
	return a;
}