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

ID:1052714 · 发表于 2022-12-18 13:14

#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++);

}

ID:384109 · 发表于 2022-12-18 22:20

FrepSelect没赋初值

ID:213173 · 发表于 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。

#include <REG51.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 Timer0Init(void)
{
TMOD = 0x01;
TH0 = 0;
TL0 = 0;
EA = 1;
ET0 = 1;
TR0 = 1;
}
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)
{
int i,j;
for (i=0;i<m;i++)
for (j=0;j<253;j++);
}

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