Question

程序输入A，led不亮，哪里出错了？

#include "reg52.h"

typedef unsigned int u16;
typedef unsigned char u8;

sbit led=P2^0;
sbit led1=P2^1;

void UsartInit()
{
TMOD=0x20;
TH1=0XF3;
TL2=0XF3;
PCON=0X80;
TR1=1;
SCON=0X50;
ES=1;
EA=1;
}

void main()
{
u8 receiveData;
UsartInit();
led=1;
led1=0;
while(1);
{
if (receiveData=='A')
led=0;
if (receiveData=='a')
led=1;
if (receiveData=='B')
led1=1;
if (receiveData=='b')
led1=0;

}
}
void Usart() interrupt 4
{
u8 receiveData;
receiveData=SBUF;
RI=0;
SBUF=receiveData;
while (!TI);
TI=0;
}

Answer 1

这是部分灯珠不良，内部或开路或短路的现象。简易维修但成本高一点的是整体更换灯板，难度稍高而成本低廉的维修方法，是找到不亮的灯珠焊下，用同规格的更换。