标题: 使用中断，蜂鸣器实现音乐功能，为什么我的FrepSelect的值在数组中无法改变 [打印本页]

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作者: 1322804412    时间: 2022-12-18 13:14
标题: 使用中断，蜂鸣器实现音乐功能，为什么我的FrepSelect的值在数组中无法改变
#include <REGX51.H>
#include "Timer0.h"
void delay (int m);

sbit Beep=P3^6;

unsigned int code FrepTable[]={
       63628,63731,63835,63928,64021,64103,64185,64260,64331,64400,64463,64528,
           64580,64633,64684,64732,64777,64820,64860,64898,64934,64968,65000,65030,
           65058,65085,65110,65134,65157,65178,65198,65217,65235,65252,65268,65283};


unsigned char Music[]={12,12,19,19,21,21,19,17,17,16,16,14,14,12};      




unsigned int FrepSelect;      


void main()
{
  Timer0Init();
  while(1)
  {[url=]U[/url]

           FrepSelect++;
   delay(500);

  }
  }
   void Timer0_Routine() interrupt 1
{
          
   TL0=FrepTable[FrepSelect]%256;
   TH0=FrepTable[FrepSelect]/256;
   Beep=!Beep;
  }

void delay (int m)

{

unsigned char i,j;

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

for (j=0;j<253;j++);

}

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作者: 人中狼    时间: 2022-12-18 22:20
FrepSelect没赋初值

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作者: wulin    时间: 2022-12-19 07:48
延时函数使用的数据类型不当，一旦实参m大于255就导致永远出不了for (i=0;i<m;i++)循环。

1. #include <REG51.H>
   
2. //#include "Timer0.h"
   
3. void delay (int m);
   
4. 
   
5. sbit Beep=P3^6;
   
6. 
   
7. unsigned int code FrepTable[]={
   
8. 63628,63731,63835,63928,64021,64103,64185,64260,64331,64400,64463,64528,
   
9. 64580,64633,64684,64732,64777,64820,64860,64898,64934,64968,65000,65030,
   
10. 65058,65085,65110,65134,65157,65178,65198,65217,65235,65252,65268,65283};
    
11. 
    
12. unsigned char Music[]={12,12,19,19,21,21,19,17,17,16,16,14,14,12};      
    
13. 
    
14. unsigned int FrepSelect;      
    
15. 
    
16. void Timer0Init(void)
    
17. {
    
18.     TMOD = 0x01;
    
19.     TH0 = 0;
    
20.     TL0 = 0;
    
21.     EA = 1;
    
22.     ET0 = 1;
    
23.     TR0 = 1;
    
24. }
    
25. 
    
26. void main()
    
27. {
    
28.         Timer0Init();
    
29.         while(1)
    
30.         {//[url=]U[/url]
    
31.                 FrepSelect++;
    
32.                 delay(500);
    
33.         }
    
34. }
    
35. void Timer0_Routine() interrupt 1
    
36. {
    
37.         TL0=FrepTable[FrepSelect]%256;
    
38.         TH0=FrepTable[FrepSelect]/256;
    
39.         Beep=~Beep;
    
40. }
    
41. 
    
42. void delay (int m)
    
43. {
    
44.         int i,j;
    
45.         for (i=0;i<m;i++)
    
46.                 for (j=0;j<253;j++);
    
47. }

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