本帖最后由 Ming305 于 2019-8-29 02:08 编辑
不才在学习单片机在串口通信方面有点问题需要请教各位前辈：
题目：1、基于单片机做一个秒表，按下按键s2，秒表开始/暂停、按下s3秒表清零计时并等待开始计时、秒表在计数的同时在数码管显示
2、在串口助手显示（同步）数码管所显示的时间
总言之就是；做一个秒表，秒表的时间通过串口发电脑上
现在我能把要求1做出来了，但是在要求2上反复调试都不能达到所要求的效果。实在是没有思路了，故在此求助各位前辈，望指教，谢谢各位前辈了。
现在我写的代码如下：
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit key1=P3^0; //λ???尴??
sbit key2=P3^1;
sbit key3=P3^2;
sbit key4=P3^3;
sbit dula=P2^6; //????U1?????????????
sbit wela=P2^7; //????U2?????????????
uchar code table[]={0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delayms(uint);
uchar numt0,num;
void display (char numdis) //????????
{
char shi,ge; //???????????????????
shi=numdis/10;
ge=numdis%10;
dula=1;
P0=table[shi]; //???λ???????
dula=0;
P0=0xff; //??λ???????????????????????λ??????
wela=1;
P0=0xfe;
wela=0;
delayms(5);
dula=1;
P0=table[ge]; //???λ???????
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delayms(5);
}
void delayms(uint xms) //????????
{
uint i,j;
for(i=xms;i>0;i--) //i=xms?????????
for(j=110;j>0;j--);
}
void init() //?????????
{ //????????0????????1??0000 0001??
TMOD = 0x01;
TH0=(65536-45872)/256; //????50ms????ж?
TL0=(65536-45872)%256;
EA=1; //?????ж?
ET0=1; //???????0?ж?
}
//????????
void UART_init()
{
TMOD = 0x20; //T1??????2 8λ??????
TH1 = 0xfd;
TL1 = 0xfd; //??????9600
TR1 = 1; //???T1?????
SM0 = 0;
SM1 = 1; //??????????1 10λ??
REN = 1; //???????????
EA = 1; //?????ж?
ES = 1; //?????ж??
}
/* void keyscan()
{
if(key1==0)
{
delayms(10);
if(key1==0)
{
num=0;
while(!key1);
}
}
if (key2==0)
{
delayms(10);
if(key2==0)
{
while(!key2);
TR0=~TR0;
}
}
} */
void main()
{
UART_init;
init();
while(1)
{
display(num);
//keyscan();
if(key1==0)
{
delayms(10);
if(key1==0)
{
num=0;
while(!key1);
}
}
if (key2==0)
{
delayms(10);
if(key2==0)
{
while(!key2);
TR0=~TR0;
}
}
}
}
void T0_time() interrupt 1
{
TH0=(65536-45872)/256; //??????
TL0=(65536-45872)%256;
numt0++;
if(numt0==20) //???????20?Σ????1s???
{
numt0=0; //????numt????
num++;
if(num==60)
num=0;
}
}
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