單片機源程序如下:
- #include <reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- sbit BEEP = P3^7;
- uchar code DSY_CODE[]=
- {
- 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0x00
- };
- uchar Pre_KeyNO = 16,KeyNO = 16;
- void DelayMS(uint ms)
- {
- uchar t;
- while(ms--)
- {
- for(t=0;t<120;t++);
- }
- }
- void Keys_Scan()
- {
- uchar Tmp;
- P1 = 0x0f;
- DelayMS(1);
- Tmp = P1 ^0x0f;
- switch(Tmp)
- {
- case1: KeyNO = 0; break;
- case 2:KeyNO = 1; break;
- case 4:KeyNO = 2; break;
- case 8:KeyNO = 3; break;
- default:KeyNO = 16;
- }
- P1 = 0xf0;
- DelayMS(1);
- Tmp = P1>> 4 ^ 0x0f;
- switch(Tmp)
- {
- case1: KeyNO += 0; break;
- case 2:KeyNO += 4; break;
- case 4:KeyNO += 8; break;
- case 8:KeyNO += 12;
- }
- }
- void Beep()
- {
- uchar i;
- for(i=0;i<100;i++)
- {
- DelayMS(1);
- BEEP =~BEEP;
- }
- BEEP = 1;
- }
- void main()
- {
- P0 = 0x00;
- while(1)
- {
- P1 =0xf0;
- if(P1!= 0xf0)
- Keys_Scan();
- if(Pre_KeyNO!= KeyNO)
- {
- P0 =DSY_CODE[KeyNO];
- Beep();
- Pre_KeyNO= KeyNO;
- }
- DelayMS(100);
- }
- }
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