stc11f02e转速表帮我看下这个程序是那里的问题

wl771217 · 发表于昨天 11:55

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各位大师麻烦帮我看下这个程序是那里的问题，用stc11f02e做一个测量电机转速的转速表，现在4位数码管显示4个0正常，但一有转速脉冲就乱显基本显示几个固定的数字比如75 1160 3350  6600等，转速很低都乱显，用的是光电传感器，#include <reg51.h>
typedef unsigned char uchar;
typedef unsigned int uint;
typedef unsigned long ulong;

sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P3M1 = 0xB1;
sfr P3M0 = 0xB2;

sbit sel0 = P3^2;
sbit sel1 = P3^3;
sbit sel2 = P3^4;
sbit sel3 = P3^7;

sbit HALL_IN = P3^5;  //霍尔输入

uchar code seg[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
#define SEG_BLANK  0xFF
uchar disp_buf[4];
uint rpm = 0;
uint rpm_last = 0;

uchar scan_cnt = 0;
uint time_cnt = 0;
uint pulse_cnt = 0;
uint buf[8];
uchar buf_idx = 0;

bit calc_flag = 0;
bit hall_last = 1;
uchar hall_timer = 0; //消抖计时
#define RPM_MAX  9999
#define STEP_LIMIT 150
#define HALL_TICK 10    //消抖需要的计时刻度

void short_delay(void)
{
uchar i;
for(i=5;i>0;i--);
}

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

void clear_filter_buf(void)
{
uchar i;
for(i=0;i<8;i++) buf=0;
buf_idx = 0;
}

// T0 2ms定时，数码扫描 + 系统计时 11.0592M
void Timer0_Init(void)
{
TMOD |= 0x01;
TH0 = 0xF8;
TL0 = 0x30;
ET0 = 1;
TR0 = 1;
EA = 1;
}

uint filter(uint val)
{
uint sum=0,i;
buf[buf_idx++] = val;
if(buf_idx>=8) buf_idx=0;
for(i=0;i<8;i++) sum += buf;
return sum>>3;
}

void calc_rpm()
{
uint rpm_tmp;
uint qian,bai,shi,ge;
rpm_tmp = pulse_cnt * 600;

if( (rpm_tmp > rpm_last + STEP_LIMIT) && (rpm_last != 0) )
{
      rpm_tmp = rpm_last;
}
else
{
      rpm_last = rpm_tmp;
}
rpm = filter(rpm_tmp);

pulse_cnt = 0;

if(rpm > RPM_MAX)
{
      disp_buf[0] = SEG_BLANK;
      disp_buf[1] = SEG_BLANK;
      disp_buf[2] = SEG_BLANK;
      disp_buf[3] = SEG_BLANK;
}
else if(rpm == 0)
{
      disp_buf[0] = 0;
      disp_buf[1] = 0;
      disp_buf[2] = 0;
      disp_buf[3] = 0;
}
else
{
      qian = rpm / 1000;
      bai  = (rpm / 100) % 10;
      shi  = (rpm / 10) % 10;
      ge = rpm % 10;

      disp_buf[0] = qian;
      disp_buf[1] = bai;
      disp_buf[2] = shi;
      disp_buf[3] = ge;

      if(disp_buf[0]==0)
      {
         disp_buf[0]=SEG_BLANK;
         if(disp_buf[1]==0)
         {
            disp_buf[1]=SEG_BLANK;
         }
      }
}
}

void Timer0_ISR() interrupt 1
{
TH0 = 0xF8;
TL0 = 0x30;
time_cnt++;

//==== 无阻塞计时消抖捕获下降沿，中断里没有延时！====
if(hall_timer > 0)
{
      hall_timer--;
}
else
{
      if(hall_last == 1 && HALL_IN == 0)
      {
         pulse_cnt++;
         hall_timer = HALL_TICK;  //锁定，一段时间内不再响应，防止连续误触发
      }
      hall_last = HALL_IN;
}

//数码管扫描
sel0 = 1;
sel1 = 1;
sel2 = 1;
sel3 = 1;
P1 = 0x00;
short_delay();

if(disp_buf[scan_cnt] != SEG_BLANK)
      P1 = seg[disp_buf[scan_cnt]];
else
      P1 = 0x00;
short_delay();

switch(scan_cnt)
{
      case 0: sel0 = 0; break;
      case 1: sel1 = 0; break;
      case 2: sel2 = 0; break;
      case 3: sel3 = 0; break;
}
scan_cnt++;
if(scan_cnt>=4) scan_cnt=0;

if(time_cnt>=50)
{
      time_cnt=0;
      calc_flag = 1;
}
}

void IO_Init(void)
{
P1M1 = 0x00;
P1M0 = 0xFF;
//位选脚推挽输出
P3M1 &= ~((1<<2)|(1<<3)|(1<<4)|(1<<7));
P3M0 |=  ((1<<2)|(1<<3)|(1<<4)|(1<<7));
//P3.5 高阻输入，不推挽
P3M1 &= ~(1<<5);
P3M0 &= ~(1<<5);
}

void main(void)
{
pulse_cnt = 0;
time_cnt = 0;
rpm_last = 0;
hall_last = 1;
hall_timer = 0;
clear_filter_buf();

IO_Init();
delay_ms(600);
Timer0_Init();

while(1)
{
      if(calc_flag == 1)
      {
         calc_flag = 0;
         calc_rpm();
      }
}
}