51單片機外部中斷測馬達轉速，數碼管顯示

ID:803227 · 發表于 2021-1-21 14:31

本帖最后由 fangbl 于 2021-1-27 09:30 編輯

#include <reg52.h>

sbit COM1 = P2^0;
sbit COM2 = P1^6;
sbit COM3 = P1^5;
sbit COM4 = P1^3;
sbit COM5 = P1^4;
sbit COM6 = P1^7;

bit flag200ms;
unsigned char T0RH;
unsigned char T0RL;
unsigned int Cnt;
unsigned char LedBuff[6] = {0x28,0x28,0x28,0x28,0x28,0x28};
unsigned char code LedChar[10] =
{
      0x28, 0xEE, 0x58, 0x4A, 0x8E,
      0x0B, 0x09, 0x6E, 0x08, 0x0A
};

void ConfigTimer0(unsigned int ms);
void LedScan();
void InitCPU();
void SpeedCount();

void main()
{
      InitCPU();
      ConfigTimer0(1);

      while (1)
      {
      if (flag200ms)       //200ms更新一次轉速
      {
         flag200ms = 0;
         SpeedCount();
      }
      }
}

void InitCPU()
{
      P1 = 0x03;       //COM輸出低電平，數碼管不亮
      COM1 = 0;
      PEDGE = 0x03; // Both edge trigger
      EX0 = 1;          // Enable INT0 interrupt
      EAL = 1;          // Enable all interrupt
}

void SpeedCount()
{
      float rmp;
      unsigned int RMP;
      unsigned int Temp;

      EX0 = 0;                      //關閉外部中斷0
      Temp = Cnt;                   //讀取200ms外部中斷信號數量
      rmp = (float)Temp;          //轉為浮點運算
      rmp = rmp / 12;             //馬達轉一圈有12個外部中斷信號（6對磁環）
      rmp = (rmp + 0.05) * 100;    //四舍五入保留2位小數
      RMP = (unsigned int)rmp;    //轉回整型數
      RMP = RMP * 3;                //200ms * (5 * 60) = 每分鐘轉速，再除以100以抵消前面保留的2位小數
      if (RMP <= 15)                //無轉速時清零
      {
            RMP = 0;
      }
      LedBuff[0] = LedChar[RMP%10];    //數碼管第6位
      LedBuff[1] = LedChar[RMP/10%10]; //數碼管第5位
      LedBuff[2] = LedChar[RMP/100%10]; //數碼管第4位
      LedBuff[3] = LedChar[RMP/1000%10]; //數碼管第3位
      LedBuff[4] = LedChar[RMP/10000%10]; //數碼管第2位
      LedBuff[5] = LedChar[RMP/100000%10]; //數碼管第1位
      Cnt = 0;                      //中斷信號數量清零
      EX0 = 1;                      //重新打開外部中斷0
}

void LedScan()                //數碼管掃描
{
      static unsigned char i;

      P0 = 0xFF;                //清SEG
      switch (i)                   //6位數碼管掃描
      {
            case 0:COM6=0; COM1=1; P0 = LedBuff[5]; i++;break;
            case 1:COM1=0; COM2=1; P0 = LedBuff[4]; i++;break;
            case 2:COM2=0; COM3=1; P0 = LedBuff[3]; i++;break;
            case 3:COM3=0; COM4=1; P0 = LedBuff[2]; i++;break;
            case 4:COM4=0; COM5=1; P0 = LedBuff[1]; i++;break;
            case 5:COM5=0; COM6=1; P0 = LedBuff[0]; i=0;break;
            default: break;
      }
}

void ConfigTimer0(unsigned int ms)                   //配置定時器0
{
      unsigned long tmp;

      tmp = 12000000/12;
      tmp = (tmp * ms)/1000;
      tmp = 65536 - tmp;
      tmp = tmp + 12;
      T0RH = (unsigned char)(tmp >> 8);
      T0RL = (unsigned char)tmp;
      TMOD &= 0xF0;
      TMOD |= 0x01;                                     //工作方式1
      TH0 = T0RH;
      TL0 = T0RL;
      ET0 = 1;
      TR0 = 1;
}

void InterruptTimer0() interrupt ISRTimer0       //定時器0中斷
{
      static unsigned char i;
      static unsigned char j;

      TH0 = T0RH;
      TL0 = T0RL;
      i++;
      if (i >= 200)
      {
            i = 0;
            flag200ms = 1;
      }
      LedScan();                               //數碼管掃描
}

void InterruptInt0() interrupt ISRInt0                      //外部中斷2
{
      Cnt++;                                  //中斷信號數量累加
}

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51單片機外部中斷測馬達轉速，數碼管顯示