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#include <reg51.h> #define INT8U unsigned char #define INT16U unsigned int const INT8U SEG_CODE[]= {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xFF}; sbit BEEP=P3^0; INT8U pre_keyNo=0xFF,keyNo=0xFF; void delay_ms(INT16U x) { INT8U t; while (x--) for (t=0;t<120;t++); } void Keys_Scan() { P1=0x0F; delay_ms(1); if(P1==0x0F) { keyNo=0xFF; return; } switch (P1) { case 0x0E:keyNo=0;break; case 0x0D:keyNo=1;break; case 0x0B:keyNo=2;break; case 0x07:keyNo=3;break; default:keyNo=0xFF;return; } P1=0xF0; delay_ms(1); switch (P1) { case 0xE0:keyNo+=0;break; case 0xD0:keyNo+=4;break; case 0xB0:keyNo+=8;break; case 0x70:keyNo+=12;break; default: keyNo=0xFF; } } void Beep() { INT8U i; for(i=0;i<100;i++) { delay_ms(1); BEEP=~BEEP; } BEEP=i; } void main() { P0=0xFF; while(1) { Keys_Scan(); if(keyNo==0xFF) { delay_ms(10); continue; } P0=SEG_CODE[keyNo]; Beep(); while (Keys_Scan(),keyNo!=0xFF); } }
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