?? ex5-4.c
字號:
/*
標題:范例 5-4
版本:1.0
Target:89S51
程序描述:這個程序利用89S51演奏生日快樂的歌曲 */
/* ***************************************************** */
#include <REGX51.H>
void delay(unsigned char n); //函數delay()存在 文件delay.c
中
code unsigned song[]={
0x82,0x01,0x81,0x94,0x84,0xB4,0xA4,0x04,0x82,0x01,0x81,
0x94,0x84,0xC4,0xB4,0x04, 0x82,0x01,0x81,0xF4,0xD4,0xB4,
0xA4,0x94,0xE2,0x01,0xE1,0xD4,0xB4,0xC4,0xB4,0x04,
0x82,0x01,0x81,0x94,0x84,0xB4,0xA4,0x04,0x82,0x01,0x81,
0x94,0x84,0xC4,0xB4,0x04, 0x82,0x01,0x81,0xF4,0xD4,0xB4,
0xA4,0x94,0xE2,0x01,0xE1,0xD4,0xB4,0xC4,0xB4,0x04,
0x00};
code int note[]={
0x0000,0xFB03,0xFB8E,0xFC0B,0xFC43,0xFCAB,0xFD08,0xFD32,
0xFD81,0xFDC7,0xFE05,0xFE21,0xFE55,0xFE83,0xFE99,0xFEC0};
unsigned char i=0;
unsigned char hi_note,low_note;
static void timer1_isr(void) interrupt TF1_VECTOR using 2
{
TR1=0;
TL1=low_note;
TH1=hi_note;
TR1=1;
P3_7=3_7;
}
static void timer1_initialize(void)
{
EA=0;
TR1=0;
TMOD = 0X10;
ET1=1;
EA=1;
}
void singing()
{
unsigned char beat,temp;
i=0;
do {
temp=song[i]; // 讀出樂譜的一個byte
if (temp==0) { // 如果是0就表示音樂結束
TR1=0; // 停止計時計數器1
return; // 返回
}
beat=temp & 0x0f; //取出低階的4位,這是拍子
temp=(temp >> 4) & 0x0f; //取出高階4位當成音符的頻率
if (temp==0) TR1=0; //如果拍子是0就表示休止符
else {
hi_note=note[temp] >> 8; //根據音符的頻率得到Timer1計數值
low_note=note[temp] & 0x00FF;
TR1=1; //啟動計時計數器1
}
delay(beat); // 延遲拍子的時間
i++;
} while(1);
}
void main (void) {
timer1_initialize();
do {
singing();
} while (1); // 無窮循環
}
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