sbit LED=P1^0
sbit K1=P1^1
sbit K2=P1^2
void delay(int ms)
{
unsigned char i
while(ms--)for(i=0i<120i++)
}
void t0isr(void) interrupt 1
{
TH0=(65536-10000)/256
TL0=(65536-10000)%256
LED=~LED
}
main()
{
TMOD=0x01
TH0=(65536-10000)/256
TL0=(65536-10000)%256
ET0=1
EA=1
while(1)
{
if(K1==0)
{
delay(10)
if(K1==0)
{
while(K1==0)
TR0=1
cnt=0
}
}
if(K2==0)
{
delay(10)
if(K2==0)
{
while(K2==0)
TR0=0
LED=1
}
}
}
}
问题在变量申明，修改为：
#include "reg52.h"typedef unsigned char u8
typedef unsigned int u16
sbit LSA=P2^2
sbit LSB=P2^3
sbit LSC=P2^4
sfr GPIO_KEY=0x90
sfr GPIO_DIG=0x80
u16 KeyValue
u8 code smgduan[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}
void delay(u16 i)
{
while(i--)
}
void KeyDown()
{
u8 a=0
GPIO_KEY=0x0f
if(GPIO_KEY!=0x0f)
{
delay(1000)
if(GPIO_KEY!=0x0f)
{
GPIO_KEY=0x0f
switch(GPIO_KEY)
{
case(0x07):KeyValue=0break
case(0x0b):KeyValue=1break
case(0x0d):KeyValue=2break
case(0x0e):KeyValue=3break
}
GPIO_KEY=0xf0
switch(GPIO_KEY)
{
case(0x70):KeyValue=KeyValuebreak
case(0xb0):KeyValue=KeyValue+4break
case(0xd0):KeyValue=KeyValue+8break
case(0xe0):KeyValue=KeyValue+12break
}
while((a<50)&&(GPIO_KEY!=0xf0))
{
delay(1000)
a++
}
}
}
}
void main()
{
LSA=0
LSB=0
LSC=0
while(1)
{
KeyDown()
GPIO_DIG=smgduan[KeyValue]
}
}
请你参考：
参照上图，代码如下：
#include<reg51.h>unsigned char i
void Delayms(unsigned int x)
{
unsigned char t
while(x--)
for(t=0t<120t++)
}
void main()
{
IT1=1
IE|=0x84
P2=0xFE
i=1
while(1)
}
void EX1_INT() interrupt 2
{
ET0=0
Delayms(10)
P2=~(1<<i)
i=++i%8
ET0=1
}
