PIC16F18855 and DT elapsed timer


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  1. #1
    Join Date
    Oct 2004
    Location
    Porto - Portugal
    Posts
    28

    Default PIC16F18855 and DT elapsed timer

    Hello to you all,

    As PIC16F876A become obsolete I decided to use PIC16F18855 to replace it, it is much cheaper than the old PIC16F876A and has more features.

    I implemented the code below (using PBP3) to get sure that the faithfull ELAPSED TIMER from Darrol's would still work with the new PIC

    ''* Name : test_pic16f18885.PBP *
    '* Date : 17-10-2018 *
    '* Version : 1.0 *
    '* Notes : *
    '************************************************* ***************
    #CONFIG
    __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_ON & _FCMEN_ON ; pag 92
    __config _CONFIG2, _MCLRE_ON & _PWRTE_ON & _LPBOREN_OFF & _BOREN_ON & _BORV_LO & _ZCD_OFF & _PPS1WAY_OFF & _STVREN_ON & _DEBUG_OFF ;pag 93
    __config _CONFIG3, _WDTCPS_WDTCPS_11 & _WDTE_ON & _WDTCWS_WDTCWS_7 & _WDTCCS_LFINTOSC
    __config _CONFIG4, _WRT_ON & _SCANE_available & _LVP_ON
    __config _CONFIG5, _CP_ON & _CPD_OFF
    #ENDCONFIG


    DEFINE OSC 08

    OSCFRQ = %11

    include "DT_INTS-14.bas"
    include "Elapsed_INT.bas"

    Clear

    ANSELA = 0
    ANSELB = 0
    ANSELC = 0

    TRISA=%11111100
    TRISB=%11111111
    TRISC=%11111111

    StatLED VAR PORTA.0
    LED var PORTA.1

    led =0

    main:
    led=1 ' to make sure PIC is running

    pause 100
    if SecondsChanged = 1 then
    SecondsChanged = 0
    Toggle StatLED ' counting seconds is "alive"
    endif

    led=1
    pause 100

    goto main


    However the compilation always return:

    [ASM ERROR] Symbol not previously defined (INT_ENTRY) (0) : ERROR[113)
    [ASM ERROR] Symbol not previously defined (INT_ENTRY) (0) : ERROR[113)
    [MESSAGE] pic16lf18855.pbpinc(603): HPWM command only supports CCP channels (not PWM channels).

    Can any of you tell me how to solve this?

    Thank's in advance

    Vicente
    nomada

  2. #2
    Join Date
    Oct 2005
    Location
    Sweden
    Posts
    3,264

    Default Re: PIC16F18855 and DT elapsed timer

    Several versions of ELAPSED_INT seems to exist. One that predates the existance of DT-Ints and one which is supposed to work WITH DT-Ints. For the one that's using DT-Ints it looks like you also need to include ReEnterPBP.bas file. Here's an example by Darrel himself, from this thread:
    Code:
    INCLUDE "DT_INTS-14.bas"
    INCLUDE "ReEnterPBP.bas"
    INCLUDE "Elapsed_INT.bas"  ; Elapsed Timer Routines
    
    ASM
    INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
            INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes
        endm
        INT_CREATE            ; Creates the interrupt processor
    
        INT_ENABLE  TMR1_INT  ; Enable Timer 1 Interrupts  
    ENDASM
    
    GOSUB ResetTime           ' Reset Time to  0d-00:00:00.00
    GOSUB StartTimer          ' Start the Elapsed Timer
    
    Main:
      IF SecondsChanged = 1 THEN  
         SecondsChanged = 0
         LCDOUT $FE,2, DEC Days,"d-",DEC2 Hours,":",DEC2 Minutes,":",DEC2 Seconds
      ENDIF
    GOTO Main
    Also, OSCFRQ = %11 can't be right but I suspect that it's the forum messing with the text.

    When posting code, please use the proper code tags.

    /Henrik.

  3. #3
    Join Date
    Jan 2006
    Location
    Istanbul
    Posts
    1,179

    Default Re: PIC16F18855 and DT elapsed timer

    Henrik posted the same code 1 second before me. So I deleted mine.
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

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