/************單片機教學(xué)實驗板 ******************/

/*74HC244 按鍵測試程序*/

#include ac

#include

#include

#include

#include

#include

#define uchar unsigned char

#define uint unsigned int

#define ulong unsigned long

sbit speaker=P1^3; //蜂鳴器

sbit A13=P2^5; //

sbit R_D=P3^7; //

sbit D4=P0^4; //

sbit D5=P0^5; //

sbit D6=P0^6; //

sbit D7=P0^7; //

sbit LED_CS=P1^4;

void Key_Beep(void);

void Delay_Beep(unsigned int count);

/*****************按鍵聲音********************/

void Key_Beep(void)

{ uchar i;

for (i=0;i<250;i++)

{ speaker=1;

Delay_Beep(5);

speaker=0;

Delay_Beep(5);

}

speaker=1;

}

/**************************************************/

/***************************蜂鳴器延時子程序start**********************/

void Delay_Beep(unsigned int count)

{

unsigned int i,j;

for(i=0;i

for(j=0;j<10;j++);

}

/***************************蜂鳴器延時子程序end************************/

/************主程序*************/

void main(void)

{

uchar key_num;

LED_CS=0;

A13=0;

R_D=0;

P0=0Xff;

Key_Beep();

Delay1ms(1000);

Key_Beep();

while(1)

{

;

}

}