单片机p1口按4*4矩阵键盘、p0口按共阳LED数码管,按下相应的键,数码管显示相应的数值。(键值0~F)
要看是共阳还是共阴的数码管。
#include<reg51.h> //包含头文件,一般情况不需要改动,头文件包含特殊功能寄存器的定义
#define uchar unsigned char
#define uint unsigned int
unsigned char const dofly[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,
0x77,0x7c,0x39,0x5e,0x79,0x71};//0-F
uchar keyscan(void);//键盘扫描
void delay(uint i); //演示程序
void main()
{
uchar key;
while(1)
{
key=keyscan(); //调用键盘扫描,
switch(key)
{
case 0x7e:P0=dofly[0];break;//0 按下相应的键显示相对应的码值
case 0x7d:P0=dofly[1];break;//1
case 0x7b:P0=dofly[2];break;//2
case 0x77:P0=dofly[3];break;//3
case 0xbe:P0=dofly[4];break;//4
case 0xbd:P0=dofly[5];break;//5
case 0xbb:P0=dofly[6];break;//6
case 0xb7:P0=dofly[7];break;//7
case 0xde:P0=dofly[8];break;//8
case 0xdd:P0=dofly[9];break;//9
case 0xdb:P0=dofly[10];break;//a
case 0xd7:P0=dofly[11];break;//b
case 0xee:P0=dofly[12];break;//c
case 0xed:P0=dofly[13];break;//d
case 0xeb:P0=dofly[14];break;//e
case 0xe7:P0=dofly[15];break;//f
}
}
}
uchar keyscan(void) //键盘扫描函数,使用行列反转扫描法
{
uchar cord_h,cord_l;//行列值中间变量
P1=0x0f; //行线输出全为0
cord_h=P1&0x0f; //读入列线值
if(cord_h!=0x0f) //先检测有无按键按下
{
delay(1000); //去抖
if((P1&0x0f)!=0x0f)
{
cord_h=P1&0x0f; //读入列线值
P1=cord_h|0xf0; //输出当前列线值
cord_l=P1&0xf0; //读入行线值
return(cord_h+cord_l);//键盘最后组合码值
}
}return(0xff); //返回该值
}
void delay(uint i) //延时函数
{
while(i--);
}
是共阳的
我这好像是共阴的,只要把unsigned char const dofly[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//0-F
等依次改一下就可以了如0x3f改为1100 0000即0Xc0