C51单片机 4x4矩阵键盘

最新推荐文章于 2024-11-13 15:11:44 发布

LiMinyu_IoT

最新推荐文章于 2024-11-13 15:11:44 发布

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文章标签：单片机计算机外设嵌入式硬件

本文链接：https://blog.youkuaiyun.com/2301_77123899/article/details/139273585

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//判断按键按下的键数
unsigned char MatriKey()
{
    unsigned char KeyNumber=0;//定义变量，利用此变量存放按键按下的键数

    //进行行扫描	
    P1=0XFF;

	P1_7=0;//进行第一行判断
	if(P1_3==0)  {LCD_Delay(20);while(P1_3==0);LCD_Delay(20);KeyNumber=1;}
	if(P1_2==0)  {LCD_Delay(20);while(P1_2==0);LCD_Delay(20);KeyNumber=2;}
	if(P1_1==0)  {LCD_Delay(20);while(P1_1==0);LCD_Delay(20);KeyNumber=3;}
	if(P1_0==0)  {LCD_Delay(20);while(P1_0==0);LCD_Delay(20);KeyNumber=4;}
	P1=0XFF;
    P1_6=0;//进行第二行判断
	if(P1_3==0)  {LCD_Delay(20);while(P1_3==0);LCD_Delay(20);KeyNumber=5;}
	if(P1_2==0)  {LCD_Delay(20);while(P1_2==0);LCD_Delay(20);KeyNumber=6;}
	if(P1_1==0)  {LCD_Delay(20);while(P1_1==0);LCD_Delay(20);KeyNumber=7;}
	if(P1_0==0)  {LCD_Delay(20);while(P1_0==0);LCD_Delay(20);KeyNumber=8;}
	P1=0XFF;
	P1_5=0;//进行第三行判断
	if(P1_3&