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  1. #1
    Join Date
    Feb 2008
    Michigan, USA

    Default Tool for watching code?

    HI all,

    This question comes from a long night of trying to guess the internals on my PIC. While trying to migrate from 16f devices to a 18F1330, I stripped down the code to the most basic part to see if I could understand how to get DT_INTs to run.
    ADCON0   = 0
    ADCON1  = %00001111      ' Set up ADCON1 no matter what you're doing!!!!!!                      
    T0CON   = %10000111      ' Set TMR0 Prescaler Bypassed, 
    T1CON   = %10110001      ' TMR1 ON, 1:1 prescaler 30 mS cycle, 5543 preload    
    RCON    = %00011111      ' NO Priority for interrupts
    OSCCON  = %01111100
    OSCTUNE = %11000010
    INCLUDE "DT_INTS-18.bas"     ' Base Interrupt System
    INCLUDE "ReEnterPBP-18.bas"  ' Include if using PBP interrupts
        '   Variable definition
        TRISB = %00000000                    
    ledR         var    PORTB.3                '
    ledG         var    PORTB.4                'on 18F1230
    PulseOut     var    PORTB.7
    INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
            INT_Handler   TMR0_INT,  _BlankGain,   PBP,  yes
            INT_Handler   TMR1_INT,  _Transmit,   PBP,  yes       
        INT_CREATE               ; Creates the interrupt processor
    @    INT_ENABLE  TMR1_INT     ; enable Timer 1 interrupts 
    TOGGLE PulseOut             ' heartbeat without the INT
    PAUSE 500
    goto main
    BlankGain:          'TMR0_INT, Green LED
    TMR0L = 0
    TMR0H = 0
    Transmit:           'TMR1_INT , RED led
    TMR1H = 0 
    TMR1L = 0
    What I found was that I had to be very careful the timing and prescaler or they started to run over each other and it locked up. The issue was that I had to guess at what was happening. In fact, I'm still not sure if I completely understand all I know about it.

    Here's the root of the question: How are you watching what is going on inside the code? I have tired on numerous occasions to use MPASM.

    I'm sure there is a way, but I have never been able to integrate it and watch while using PBP. I read and article from Chuck Hellebuyck that was suppose to explain it, but I have never got it to work for me.

    There is a Simulator from Oshonsoft that is really neat, but strictly Microchip assembly. I have managed to put it to some use, but it is tedious converting PBP to .asm just to see what's going on.

    You all can't all be going through this to produce some of the incredible solutions that I see here, are you?


    I thought I had it figured out, but I left it running for that last 6 hours and when I came back, all is not well in Gotham. The Green LED is toggling, but the other two are stuck on. Not working as planned, and wondering how to determine where the issue is....
    Last edited by boroko; - 14th March 2009 at 21:46. Reason: update:

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