请教一下51单片机矩阵键盘+蜂鸣器做电子琴的问题
为什么我的代码不行，运行之后只能按一个键响，按其他键完全没反应啊，是不是那个中断的问题，我想了好久了。。。
程序代码：
#include<stc15.h>
#include<intrins.h>
#include<gpio.h>
#define uchar unsigned char
#define uint unsigned int
#define KEY P2 //矩阵键盘接口
sbit beep=P1^0; //蜂鸣器
uchar key_volume=0; //键值
uint code tone[14]={1276,1136,1012,956,852,759,716,638,568,506,57,51,45,43}; //音调分别为So(低)、La(低)、Si(低)、Do(中)、Re(中)、Mi(中)、Fa(中)、So(中)、La(中)、Si(中)、Do(高)、Re(高)、Mi(高)、Fa(高)
void Delay1ms() //@11.0592MHz
{
unsigned char i, j;
_nop_();
_nop_();
_nop_();
i = 11;
j = 190;
do
{
while (--j);
} while (--i);
}
void Delayxms(uint t)
{
uint x;
for(x=0;x<t;x++)
{
Delay1ms();
}
}
void Time0_init() //定时器初始化
{
TMOD=0x01; //定时器0，方式1
EA=1;
ET0=1;
TR0=1;
}
uchar keyscan() //键盘扫描
{
uchar row,colume; //行、列变量
KEY=0x0f;
if(KEY!=0x0f)
{
Delayxms(10);
if(KEY!=0x0f)
{
KEY=0xef;
if(KEY!=0xef)
{
row=0;
goto colume_scan;
}
KEY=0xdf;
if(KEY!=0xdf)
{
row=1;
goto colume_scan;
}
KEY=0xbf;
if(KEY!=0xbf)
{
row=2;
goto colume_scan;
}
KEY=0x7f;
if(KEY!=0x7f)
{
row=3;
goto colume_scan;
}
return(16);
colume_scan:
if((KEY&0x01)==0) colume=0;
else if((KEY&0x02)==0) colume=1;
else if((KEY&0x04)==0) colume=2;
else colume=3;
key_volume=row*4+colume;
while((KEY&0x0f)!=0x0f);
}
}
else KEY=0xff;
return(16);
}
void value_ISR() interrupt 1
{
TF0=0;
//keyscan();
if(KEY==0xed)
{
TH0=(65536-tone[0])/256; //填充初值
TL0=(65536-tone[0])%256;
TR0=1;
beep=~beep; //发出不同音调
while(KEY!=0xed); //判断键释放
}
else if(KEY==0xeb)
{
TH0=(65536-tone[1])/256;
TL0=(65536-tone[1])%256;
TR0=1;
beep=~beep;
while(KEY!=0xeb);
}
else if(KEY==0xe7)
{
TH0=(65536-tone[2])/256;
TL0=(65536-tone[2])%256;
TR0=1;
beep=~beep;
while(KEY!=0xe7);//判断键释放
}
else if(KEY==0xde)
{
TH0=(65536-tone[3])/256;
TL0=(65536-tone[3])%256;
TR0=1;
beep=~beep;
while(KEY!=0xde);
}
else if(KEY==0xdd)
{
TH0=(65536-tone[4])/256;
TL0=(65536-tone[4])%256;
TR0=1;
beep=~beep;
while(KEY!=0xdd); //判断键释放
}
else if(KEY==0xdb)
{
TH0=(65536-tone[5])/256;
TL0=(65536-tone[5])%256;
TR0=1;
beep=~beep;
while(KEY!=0xdb);
}
else if(KEY==0xd7)
{
TH0=(65536-tone[6])/256;
TL0=(65536-tone[6])%256;
TR0=1;
beep=~beep;
while(KEY!=0xd7); //判断键释放
}
else if(KEY==0xbe)
{
TH0=(65536-tone[7])/256;
TL0=(65536-tone[7])%256;
TR0=1;
beep=~beep;
while(KEY!=0xbe);
}
else if(KEY==0xbd)
{
TH0=(65536-tone[8])/256;
TL0=(65536-tone[8])%256;
TR0=1;
beep=~beep;
while(KEY!=0xbd); //判断键释放
}
else if(KEY==0xbb)
{
TH0=(65536-tone[9])/256;
TL0=(65536-tone[9])%256;
TR0=1;
beep=~beep;
while(KEY!=0xbb);
}
else if(KEY==0xb7)
{
TH0=(65536-tone[10])/256;
TL0=(65536-tone[10])%256;
TR0=1;
beep=~beep;
while(KEY!=0xb7); //判断键释放
}
else if(KEY==0x7e)
{
TH0=(65536-tone[11])/256;
TL0=(65536-tone[11])%256;
TR0=1;
beep=~beep;
while(KEY!=0x7e);
}
else if(KEY==0x7d)
{
TH0=(65536-tone[12])/256;
TL0=(65536-tone[12])%256;
TR0=1;
beep=~beep;
while(KEY!=0x7d); //判断键释放
}
else if(KEY==0x7b)
{
TH0=(65536-tone[13])/256;
TL0=(65536-tone[13])%256;
TR0=1;
beep=~beep;
while(KEY!=0x7b);
}
}
void main()
{
gpio(); //端口初始化
Time0_init();
while(1)
{
key_volume=0; //键值清零
keyscan();
if(key_volume!=0 && key_volume!=15)
{
IE1=1; //进入外部中断1 外部中断1可以这样触发吗
}
}
}
