本来想按一次按键加一的,可是实际情况是按一次按键加三
这是在《
单片机C语言程序设计实训100例》中的例子,我看了好几遍代码了,找不到问题,大家帮忙给看看
#include <reg51.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar code DSY_CODE[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
uchar Num_Buffer[]={0,0,0};
uchar Key_Code,Key_Counts=0;
void DelayMS(int x)
{
uchar i;
while(x--)for(i=0; i<120; i++);
}
void Show_Counts_ON_DSY()
{
uchar i,j=0x01;
Num_Buffer[2]=Key_Counts/100;
Num_Buffer[1]=Key_Counts/10%10;
Num_Buffer[0]=Key_Counts%10;
for(i=0; i<3; i++)
{
j=_cror_(j,1);
P0=0xff;
P0=DSY_CODE[Num_Buffer
];
P2=j;
DelayMS(1);
}
}
void main()
{
uchar i;
P0=0xff;
P1=0xff;
P2=0x00;
Key_Code=0xff;
while(1)
{
Show_Counts_ON_DSY();
P1=0xff;
Key_Code=P1;
if(Key_Code!=0xff)
for(i=0; i<30; i++)Show_Counts_ON_DSY();
switch(Key_Code)
{
case 0xfe: if(Key_Counts<255)Key_Counts++;
break;
case 0xfd: if(Key_Counts>0)Key_Counts--;
break;
case 0xfb: Key_Counts=0;
}
Key_Code=0xff;
}
}
问题是不管是按加,还是按减,都是变化3个数,而且我是用软件仿真的说
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