电路原理图如下:
// 4×4 键盘矩阵按键
#include <avr/io.h>
#include <util/delay.h>
#define uint unsigned int
#define BEEP( ) PORTD ^= _BV(PD7) //蜂鸣器
uint KeyNo = 16 ; //16表示无按键
const uint SEG_CODE[ ] =
{
0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,
0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71
};
uint Key_Down() // 消抖与松检测
{
DDRB = 0XF0; PORTB = 0X0F;
_delay_ms(1);
if(PINB!=0x0F)return 1; // return PINB!= 0x0f ? 1:0;
else return 0;
}
//-------------------- 重点------------------- //
void Keys_Scan() //------------ 键盘矩阵扫描程序
{
switch(PINB)
{
case 0B00001110: KeyNo=0; break;
case 0B00001101: KeyNo=1; break;
case 0B00001011: KeyNo=2; break;
case 0B00000111: KeyNo=3; break;
default: KeyNo=0xFF;
}
DDRB = 0X0F; PORTB = 0xF0;
_delay_ms(1);
switch(PINB)
{
case 0B11100000: KeyNo+=0; break;
case 0B11010000: KeyNo+=4; break;
case 0B10110000: KeyNo+=8; break;
case 0B01110000: KeyNo+=12; break;
default: KeyNo= 0xFF;
}
}
void sounn()
{
uint i;
for ( i = 0; i < 200; i++)
{
_delay_ms(1);_delay_ms(1);
BEEP( );
}
}
int main()
{
while(1)
{
if( Key_Down( ))Keys_Scan ( ); //有按下就读值,否则一边玩去
else continue;
if( KeyNo < 16)
{
DDRC = 0xff;
PORTC = SEG_CODE[ KeyNo ];
sounn();
}
while( Key_Down( ));//松手了没有?
}
}
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一款很精炼的矩阵键盘扫描应用电路图.rar
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