基于ATmega16 4*4矩阵键盘单数码管显示 0~F - 中科因仑“3+1”工程特种兵精英论坛

#include <iom161v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int
uchar seg[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7f,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,0x3F};
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 */
uchar key = 0;
/*******************************************************
//函数名称：uchar get_key(void)
//函数功能：获取按键值
//输入参数：无
//返回参数：按键值key
********************************************************/
uchar get_key(void)
{
//PA 7 6 5 4 3 2 1 0
PORTA = 0xFE; //PA0拉低 1 1 1 1 1 1 1 0
if(PINA==0xFE) {key = 0;} //没有按键按下 1 1 1 1 1 1 1 0
if(PINA!=0xFE) //有按键按下
{
if(PINA==0xEE) {key = 16;} //K16按下PA4被拉低 1 1 1 0 1 1 1 0
if(PINA==0xDE) {key = 12;} //K12按下PA5被拉低 1 1 0 1 1 1 1 0
if(PINA==0xBE) {key = 8;} //K8按下PA6被拉低 1 0 1 1 1 1 1 0
if(PINA==0x7E) {key = 4;} //K4按下PA7被拉低 0 1 1 1 1 1 1 0
}
//PA 7 6 5 4 3 2 1 0
PORTA = 0xFD; //PA1拉低 1 1 1 1 1 1 0 1
if(PINA==0xFD) {key = 0;} //没有按键按下 1 1 1 1 1 1 0 1
if(PINA!=0xFD) //有按键按下
{
if(PINA==0xED) {key = 15;} //K15按下PA4被拉低 1 1 1 0 1 1 0 1
if(PINA==0xDD) {key = 11;} //K11按下 PA5被拉低 1 1 0 1 1 1 0 1
if(PINA==0xBD) {key = 7;} //K7按下PA6被拉低 1 0 1 1 1 1 0 1
if(PINA==0x7D) {key = 3;} //K3按下PA7被拉低 0 1 1 1 1 1 0 1
}
//PA 7 6 5 4 3 2 1 0
PORTA = 0xFB; //PA2拉低 1 1 1 1 1 0 1 1
if(PINA==0xFB) {key = 0;} //没有按键按下 1 1 1 1 1 0 1 1
if(PINA!=0xFB) //有按键按下
{
if(PINA==0xEB) {key = 14;} //K14按下PA4被拉低 1 1 1 0 1 0 1 1
if(PINA==0xDB) {key = 10;} //K10按下PA5被拉低 1 1 0 1 1 0 1 1
if(PINA==0xBB) {key = 6;} //K6按下PA6被拉低 1 0 1 1 1 0 1 1
if(PINA==0x7B) {key = 2;} //K2按下PA7被拉低 0 1 1 1 1 0 1 1
}
//PA 7 6 5 4 3 2 1 0
PORTA = 0xF7; //PA3拉低 1 1 1 1 0 1 1 1
if(PINA==0xF7) {key = 0;} //没有按键按下 1 1 1 1 0 1 1 1
if(PINA!=0xF7) //有按键按下
{
if(PINA==0xE7) {key = 13;} //K13按下PA4被拉低 1 1 1 0 0 1 1 1
if(PINA==0xD7) {key = 9;} //K9按下PA5被拉低 1 1 0 1 0 1 1 1
if(PINA==0xB7) {key = 5;} //K5按下PA6被拉低 1 0 1 1 0 1 1 1
if(PINA==0x77) {key = 1;} //K1按下PA7被拉低 0 1 1 1 0 1 1 1
}
return key;
}
/*******************************************************
//函数名称：int main(void)
//函数功能：主函数
//输入参数：无
//返回参数：0
********************************************************/
int main(void)
{
DDRA |= 0x0F;
PORTA |= 0xFF;
DDRB |= 0xFF;
PORTB |= 0xFF;
while(1)
{
PORTB = seg[get_key()];
}
return 0;
}

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