单片机频率计与计算机实现串口通信程序有错误

ID:837970 · 发表于 2021-5-11 21:55

功能描述：可测8KHZ以内的频率，并能通过串口实现将频率值发送到电脑上显示
问题：请教串口通信函数怎么可以在主函数中调用，也请指出原函数的错误之处

实验程序及仿真如下

#include <reg51.h>

//四位一体数码管位选
sbit Awei = P1^0;
sbit Bwei = P1^1;
sbit Cwei = P1^2;
sbit Dwei = P1^3;

void jisuan();
void delay(int x);
int change(int x);

unsigned int shu;
void yanchi();
void chuankou();
void INIT();

//字形编码定义
#define SHU_0 0X3F;
#define SHU_1 0X06;
#define SHU_2 0X5B;
#define SHU_3 0X4F;
#define SHU_4 0X66;
#define SHU_5 0X6D;
#define SHU_6 0X7D;
#define SHU_7 0X07;
#define SHU_8 0X7F;
#define SHU_9 0X6F;

int ge=0, shi=0, bai=0, qian=0;
int count = 0, i = 0;
int freq = 0;
int main()
{
      ge = 0; shi = 0; bai = 0; qian = 0;
      //
      TMOD       = 0X15;
      //
      TH0 = 0;
      TL0 = 0;
      TH1 = (65535 - 50000)/256;
      TL1 = (65535 - 50000)%256;
      //
      IT0 = 1;
      EX0 = 1;
      //
      EA = 1;
      ET0 = 1;
      ET1 = 1;
      //
      TR0 = 1;
      TR1 = 1;
      while(1)
      {
      //动态显示
      jisuan();
            Awei = 1; Bwei = 1; Cwei = 1; Dwei = 0;
            P2 =  change(ge);
            delay(10);
            P2 = 0X00;
            Awei = 1; Bwei = 1; Cwei = 0; Dwei = 1;
            P2 =  change(shi);
            delay(10);
            P2 = 0X00;
            Awei = 1; Bwei = 0; Cwei = 1; Dwei = 1;
            P2 =  change(bai);
            delay(10);
            P2 = 0X00;
            Awei = 0; Bwei = 1; Cwei = 1; Dwei = 1;
            P2 =  change(qian);
            delay(10);
            P2 = 0X00;

      }
}
void service_timer0() interrupt 1 using 1
{
TH0 = 0;
TL0 = 0;
}
void service_timer1() interrupt 3 using 3
{
         TH1 = (65535 - 50000)/256;
      TL1 = (65535 - 50000)%256;
      i++;
      if (i == 20)
      {
            freq =TL0 + TH0*256;
            i = 0;
            TH0 = 0;
                  TL0 = 0;
      }
}

void jisuan()
{
      qian = freq /1000;
      bai = (freq%1000)/100;
      shi = (freq%100)/10;
      ge = freq%10;
}
void delay(int x)
{
      int i, j;
      for(i = 0; i < x; i++)
            for(j = 0; j < 100; j++);
}
int change(int x)
{
      int shu;
      switch(x)
      {
            case 0: shu = SHU_0; break;
            case 1: shu = SHU_1; break;
            case 2: shu = SHU_2; break;
            case 3: shu = SHU_3; break;
            case 4: shu = SHU_4; break;
            case 5: shu = SHU_5; break;
            case 6: shu = SHU_6; break;
            case 7: shu = SHU_7; break;
            case 8: shu = SHU_8; break;
            case 9: shu = SHU_9; break;
      }
      return shu;
}

void yanchi(unsigned int a)
{
while(a--);
}
void INIT()
{
  TMOD=0X20;
      TR1=1;
      TH1=0Xfd;
      TL1=0Xfd;
      SCON=0X40;
      ES=1;
      EA=1;
}
void chuankou()
{
      unsigned char i;
  INIT();
      while(1)
      {
      for(i=0;i<4;i++)
      {
         SBUF=shu;
               delay(1000);
      }
      while(1);
      }
}
void Serial() interrupt 4
{
TI=0;
}

ID:889094 · 发表于 2021-5-12 01:21

change函数参数和返回值最好用uchar，一是节约ram一是给P口赋值用

ID:390416 · 发表于 2021-5-12 08:01

串口1打印程序可以打印3个十六位的变量波特率9600 http://www.51hei.com/bbs/dpj-201660-1.html

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