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求助 加了中斷之后有報(bào)錯(cuò)
單片機(jī)源程序如下:
#include "reg52.h"
typedef unsigned int u16;
typedef unsigned char u8;
//定義獨(dú)立按鍵控制腳
sbit KEY1=P0^5; //A
sbit KEY2=P0^6; //B
sbit KEY3=P0^0; //感應(yīng)器
sbit KEY4=P0^4; //光柵
//定義LED1控制腳
sbit LED1=P1^0;
sbit LED2=P1^1;
//使用宏定義獨(dú)立按鍵按下的鍵值
#define KEY1_PRESS 1
#define KEY2_PRESS 2
#define KEY3_PRESS 3
#define KEY4_PRESS 4
#define KEY_UNPRESS 0
void delay_10us(u16 ten_us)
{
while(ten_us--);
}
u8 key_scan(u8 mode)
{
static u8 key=1;
if(mode)key=1;//連續(xù)掃描按鍵
if(key==1&&(KEY1==0||KEY2==0||KEY3==0||KEY4==0))//任意按鍵按下
{
delay_10us(1000);//消抖
key=0;
if(KEY1==0)
return KEY1_PRESS;
else if(KEY2==0)
return KEY2_PRESS;
else if(KEY3==0)
return KEY3_PRESS;
else if(KEY4==0)
return KEY4_PRESS;
}
else if(KEY1==1&&KEY2==1&&KEY3==1&&KEY4==1) //無(wú)按鍵按下
{
key=1;
}
return KEY_UNPRESS;
}
void Int1Init()
{
//設(shè)置INT0
IT1=1;//跳變沿出發(fā)方式（下降沿）
EX1=1;//打開(kāi)INT0的中斷允許。
EA=1;//打開(kāi)總中斷
}
void main()
{
u8 key=1;
Int1Init();
while(1);
}
void Int1() interrupt 2
{
delay_10us(1000);
if(KEY4==0)
{
key=key_scan(0);
if(key==KEY1_PRESS)
LED1=!LED2;
else if(key==KEY3_PRESS)
LED2=!LED2;
else if(key==KEY2_PRESS)
(LED2=!LED2)|(LED1=!LED1);
}
}
main.c(75): error C202: 'key': undefined identifier
main.c(76): error C202: 'key': undefined identifier
main.c(78): error C202: 'key': undefined identifier
main.c(80): error C202: 'key': undefined identifier
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