Duda con frecuencimetro y contador de revoluciones con Mikropascal

[Mikro-77]

Hola tengo un codigo escrito en Mikropascal el problema es que no entiendo porque toma la lectura al principio y luego la pone en 0 , no entiendo cual es la variable que hace que la lectura no siga , entiendo que este foro tratan sobre este lenguaje tambien asi que les agradezco su ayuda !

Código Delphi [-]
program Frekvens_taeller;

{/******************************************************************************
* Project name:
EP6_freq.c EasyPIC5 and 6 using a LCD display
* Copyright:
Open-source - Oct 2009 - Roman Black and CRH
* Description:
The incoming frequency to be measured must be
connected to PORTC.F0 (T1CKI) pin. Max freq measured is 65000 Hz.
Note! If you don't have a freq signal connected, you can test it
by pressing the RC0 pushbutton REALLY quickly.

* Test configuration:
MCU: PIC16F887

Dev.Board: EasyPIC5 and 6

Oscillator: HS, 8.0000 MHz
Ext. Modules: - freq signal comes in on PORTC.F0
SW: mikroC PRO for PIC v3.20


******************************************************************************/}
Var
  // LCD module connections same as MikroPascal!
  LCD_RS : sbit at RB4_bit;
  LCD_EN : sbit at RB5_bit;
  LCD_D4 : sbit at RB0_bit;
  LCD_D5 : sbit at RB1_bit;
  LCD_D6 : sbit at RB2_bit;
  LCD_D7 : sbit at RB3_bit;

  LCD_RS_Direction : sbit at TRISB4_bit;
  LCD_EN_Direction : sbit at TRISB5_bit;
  LCD_D4_Direction : sbit at TRISB0_bit;
  LCD_D5_Direction : sbit at TRISB1_bit;
  LCD_D6_Direction : sbit at TRISB2_bit;
  LCD_D7_Direction : sbit at TRISB3_bit;
  // End LCD module connections

  int_sec_count: byte; // used to count ints/second
  new_second: boolean; // is set once per second

  //tchar: char; // text char used in LCD display numbers
  freq: word;  // 0-65000, holds freq value to display integer = heltal

  rpm: dword; // holds RPM for calcs AND display RPM= Revolution pr minute =  omdrejninger pr sekund

  txt: array[16] of char; // used to display number string
  //sec_count: char;

//----------------------------------------------------------------------------


// this is TMR2 overflow interrupt
procedure interrupt;
 begin
  Dec(int_sec_count);
  if int_sec_count=0  then // if reached 1 second!
   begin
    // get the TMR1 count!
    T1CON := 0; // TMR1 OFF
    Hi(freq) := TMR1H ; // put TMR1 16bit value in freq
    Lo(freq) := TMR1L;
    TMR1L := 0; // clear TMR1
    TMR1H := 0;
    T1CON := %00000011; // TMR1 back ON again
    // that's everything done for this second
    new_second:=true;
    int_sec_count := 125; // load ready to generate another second
  end;
  TMR2IF_bit := 0; // Clear TMR2IF before exit
 end;




//-----------------------------------------------------------------------------
Begin
  // setup PIC 16F887 registers
  ANSEL := 0; // Configure AN pins as digital
  ANSELH := 0;
  C1ON_bit := 0; // Disable comparators
  C2ON_bit := 0;

  TRISC := %00000001; // PORTC.F0 = input from freq signal

  TRISB := 0; //
  PORTB := 0xFF; //
  TRISB := 0xFF; //

  //-------------------------------------------------------
  // EasyPIC5 and 6 LCD setup

  // show startup message
  //Lcd_Config(0); // Initialize Lcd over SPI interface
  Lcd_Init();
  Lcd_Cmd(_LCD_CLEAR); // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF); // Turn cursor off
  txt := 'frekvens';
  Lcd_Out(1,2,txt); // display startup text to Lcd
  txt := ' & Omdrejtaller ';
  Lcd_Out(2,2, txt);
  Delay_1sec();
  Delay_1sec();

  // clear LCD again before main
  Lcd_Cmd(_LCD_CLEAR);

  //-------------------------------------------------------
  // setup the timers for frequency counting

  // setup TMR1
  T1CON := %00000011; // TMR1 ON, external clock pulse on PORTC.F0

  // setup TMR2 and enable TMR2 int
  T2CON := %00011111; // TMR2 ON, 8MHz xtal, 16:4:1 = 31250 Hz (Timer 2 prescaler settings)
  PR2 := 249; // TMR2 int is 31250 / 250 = 125 ints/sec
  PIE1.TMR2IE := 1; // TMR2 interrupt is on
  // load variables ready to run
  int_sec_count := 125;
  INTCON := %11000000; // GIE=ON, PIE=ON

  //-------------------------------------------------------
  // now do the main run loop
  while true do
   begin
    // everytime we reach a second, calculate and display freq
    if new_second then
     begin
      new_second := false;
      // safe limit freq at 65 kHz
      if freq > 65000 then
       freq := 65000;
       
      // display freq as "xxxxx Hz"
      WordToStr(freq,txt);
      Lcd_Out(1,8,txt);
      txt := 'Hz';
      Lcd_Out(1,14,txt);

      // calc RPM from freq
      rpm := (freq * 60);

      // format rpm to display as "xxxxxxx RPM"
      LongWordToStr(rpm,txt); // get the rpm as a string
      Lcd_Out(2,2,txt); // and display RPM!
      txt := 'RPM';
      Lcd_Out(2,14,txt);
      
      //************
      Dec(int_sec_count);
  if int_sec_count=0  then // if reached 1 second!
   begin
    // get the TMR1 count!
    T1CON := 0; // TMR1 OFF
    Hi(freq) := TMR1H ; // put TMR1 16bit value in freq
    Lo(freq) := TMR1L;
    TMR1L := 0; // clear TMR1
    TMR1H := 0;
    T1CON := %00000011; // TMR1 back ON again
    // that's everything done for this second
    new_second:=true;
    int_sec_count := 125; // load ready to generate another second
  end;
  TMR2IF_bit := 0; // Clear TMR2IF before exit
      //************
      
      
     end;
   end;
end.

[Mikro-77]

Vamos amigos ! se que hay verdaderos gurúes en este foro !!!

[Ñuño Martínez]

Es que Mikropascal no es muy utilizado. Aun así, sé que algunos miembros lo usan, o al menos lo han usado.

En el IRC (IRC-hispano, salas #delphi y #pascal) entra gente que usa Mikropascal a menudo, así que quizá te pueden ayudar.

[fenixariel]

No importa el lenguaje, se sigue de la misma manera, en C, Pascal, hasta en ASM,

Me parece que en la interrupcion no?


Saludos.