单片机串口调试助手怎么用?printf()函数输出乱码!

ID:640600 · 发表于 2019-11-12 18:16

串口调试助手的printf()函数输出乱码!
//part2.42.c 串口通信在硬件调试的应用

#include <reg52.h>
#include <intrins.h>
#include <stdio.h>

#define  uchar unsigned char
#define uint unsigned int

sbit dula=P2^6;
sbit wela=P2^7;
sbit adwr=P3^6;
sbit adrd=P3^7;

uchar flag,a;

unsigned char flag_uart,flag_time,flag_on,a,i,t0_num,ad_val;
float ad_vo;

uchar code table[]= {
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71
};

void delayms(uint xms)
{
uint i,j;
for(i=xms; i>0; i--)
{
      for(j=110; j>0; j--);
}
}

void init()    //串口的初始化
{
TMOD=0x21;
//SCON=0x50;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TH1=0xfd;
TL1=0xfd;
TR1=1;
ET0=1;
SM0=0;
SM1=1;
REN=1;
EA=1;
ES=1;
}

void display(uchar value)
{
uchar bai,shi,ge;
bai=value/100;
shi=value%100/10;
ge=value%10;
dula=1;
P0=table[bai];
dula=0;
P0=0xff;
wela=1;
P0=0x7e;
wela=0;
delayms(5);
dula=1;
P0=0xff;
wela=1;
P0=0x7d;
wela=0;
delayms(5);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0x7d;
wela=0;
delayms(5);

}
uchar get_ad()
{
uchar adval;
adwr=1;
_nop_();
adwr=0;
_nop_();
adwr=1;
P1=0xff;
adrd=1;
_nop_();
adrd=0;
_nop_();
adval=P1;
adrd=1;
return adval;
}

void main()
{
init();

wela=1;
P0=0x7f;
wela=0;
            puts("TURN ON AD!\n");
               P0=0xf0;
while(1)
{

      if(flag_uart==1)
      {
         flag_uart=0;
         ES=0;
         TI=1;
         switch(1)
         {
         case 0:
            puts("TURN ON AD!\n");
            TR0=1;
            break;
         case 1:
            printf("TURN OFF AD!\n");
            TR0=0;
            break;
         case 2:
            puts("ERROR!\n");
            break;
         }
         while(!TI);
         TI=0;
         ES=1;
      }
      if(flag_time==1)
      {
         flag_time=0;
         ad_val=get_ad;
         ad_vo=(float)ad_val*5.0/256.0;
         ES=0;
         TI=1;
         printf("The voltage is %fV\n",ad_vo);
         while(!TI);
         TI=0;
         ES=1;
      }
      display(ad_val);
}
}

void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t0_num++;
if(t0_num==20)
{
      t0_num=0;
      flag_time=1;
}
}

void ser() interrupt 4
{
RI=0;
a=SBUF;
flag_uart=1;
if(a==1)
{
      flag_on=0;
}
else if(a==2)
{
      flag_on=1;
}
else
{
      flag_on=2;
}
}

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