这个单片机测电机转速程序为啥不能检测到脉冲?

ID:448185 · 发表于 2019-4-26 17:41

那位大佬可以帮我看看

单片机源程序如下:
#include <reg52.h>

typedef unsigned int u16;
typedef unsigned char u8;

#define LCD1602_DATAPINS P0
sbit LCD1602_E=P2^7;
sbit LCD1602_RW=P2^5;
sbit LCD1602_RS=P2^6;

u16 j,z,s,count,zhuan;
u8 display[]="speed=    r/s  ";

void Lcd1602_Delay1ms(u16 c)  //yan shi
{
u16 a,b;
      for (; c>0; c--)
      {
               for (b=199;b>0;b--)
               {
                        for(a=1;a>0;a--);
               }
      }

}

void LcdWriteCom(u8 com)       //xie yi ge ming ling
{
      LCD1602_E = 0;
      LCD1602_RS = 0;
      LCD1602_RW = 0;

      LCD1602_DATAPINS = com;
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;
}

void LcdWriteData(u16 dat)       //xie ru yi ge shu jv
{
      LCD1602_E = 0;
      LCD1602_RS = 1;
      LCD1602_RW = 0;

      LCD1602_DATAPINS = dat;
      Lcd1602_Delay1ms(1);

      LCD1602_E = 1;
      Lcd1602_Delay1ms(5);
      LCD1602_E = 0;
}

void LcdInit()                                                 //LCD chu shi hua
{
      LcdWriteCom(0x38);
      LcdWriteCom(0x0c);
      LcdWriteCom(0x06);
      LcdWriteCom(0x01);
      LcdWriteCom(0x80);
}

void displaytolcd()
{
      LcdWriteCom(0x80); //?LCD1602xie shu jv
      for (j=0;j<16;j++)
      {
         LcdWriteData(display[j]);
      }
}

void Jshu0Init()
{
      TMOD=0x05;
      TH0=0xff;
      TL0=0xff;
      TR0=1;
      ET0=1;
      EA=1;
}
void Timer0Init()
{
      TMOD|=0X01;
      TH0=0XFC;       //ding shi 1ms
      TL0=0X18;
      ET0=1;
      EA=1;
      TR0=1;
}

void  disp_count()
{
            LcdWriteCom(0x80); //?LCD1602xie shu jv
      display[7]=(zhuan/1000+'0');
      display[8]=(zhuan/100%10+'0');
      display[9]=(zhuan/10%10+'0');
      display[10]=(zhuan%10+'0');
}

void main()
{
  LcdInit();
      Jshu0Init();
      Timer0Init();
      disp_count();
      displaytolcd();

      while(1);
}

void Jshu0()       interrupt 0
{
      TH0=0xff;
TL0=0xff;
s++;
}

void Timer0() interrupt 1
{
      static u16 i;
      static u16 s;
      TH0=0XFC;       //1ms
      TL0=0X18;
      i++;
      if(i==1000)
      {
            displaytolcd();
            zhuan=s;
            disp_count();
ET0=0;
i=0;
TH0=0XFC;       //1ms
      TL0=0X18;
            s=0;

      }
      ET0=1;

}

ID:94031 · 发表于 2019-4-27 10:08

应该把硬件原理图也发出来。

ID:448185 · 发表于 2019-4-27 15:17

xuyaqi 发表于 2019-4-27 10:08
应该把硬件原理图也发出来。

D:\单片机\CH6800-ES V2.0光盘资料(新)\开发板原理图"

ID:357633 · 发表于 2019-4-29 13:43

static u16 s;
u16 j,z,s,count,zhuan;
这里有两个s定义，zhuan=s;是static u16 s;这个s的值，一直都是0，没改变过

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