#include #define uchar unsigned char #define uint unsigned int sbit BEEP=P3^7; //Happy Birthday song note frequency table, different frequencies are determined by different delays uchar code SONG_TONE[]= {212,212,190,212,159,169,212,212,190,212,142,159,212,212,106,126,159,169,190,119,119,126,159,142,159,0}; //Happy Birthday song beat chart, the beat determines the playing length of each note uchar code SONG_LONG[]= {9,3,12,12,12,24,9,3,12,12,12,24, 9,3,12,12,12,12,12,9,3,12,12,12,24,0}; //Delay void DelayMS(uint x) { flying t; while(x--) for(t=0;t<120;t++); } //Play function void PlayMusic() { uint i=0,j,k; while(SONG_LONG[i]!=0||SONG_TONE[i]!=0) { //Play each note, SONG_LONG is the beat length for(j=0;j BEEP=~BEEP; //SONG_TONE delay table determines the frequency of each note for(k=0;k DelayMS(10); i++; } } void main() { BEEP=0; while(1) { PlayMusic(); //Play Happy Birthday DelayMS(500); //Pause for a while after playing } }
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Practical Applications in Digital Signal Processing (Richard Newbold)
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