Beginer problems


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  1. #1
    Join Date
    Jan 2010
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    37

    Default Beginer problems

    Hi!
    I just started to explore Microchip PIC and I have a huge problem.
    I am very satisfactory with writing code in PicBasic, to simulate different schematics in Proteus, to program different microchip pic (12F629, 16F628) with a JDM programmer and verify, but my problem is that when I make the schematic on a breadboard (solderless board) nothing works!
    I used a 9V battery, ULN7805+10uF+0.1uF, a 12F629 (and later 16F628) and tried to flash a led on one microcontroller pin + 330 ohmi resistor.
    Do you know what can be wrong?

    The microcontroller seems to be well programed (and verified), the power supply is stable, same schematic works well in proteus (and many more other schematics with microcontrollers) ...
    The JDM programmer was bought from a local store...
    I don't use any anti-static tools.
    Thank you very much!

  2. #2
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    May 2004
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    Wink

    Hi, Luxor

    Welcome aboard the Forum !

    Could you post here one of the codes you tried ???

    Will be much, much, much simpler to find what you've forgotten ...

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  3. #3
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    Default This is my code and schematics

    '************************************************* ********
    '
    ' LED FLASHING PROGRAM
    ' ======================
    '
    ' This program flashes an LED connected to port RB0 of PORTB. The
    ' LED is flashed with 1 second intervals.
    '************************************************* ************
    '
    LED VAR PORTB.0 ' Define RB0 as LED
    '
    ' START OF MAIN PROGRAM
    '
    TRISB = 0 ' Set PORTB pins as outputs
    AGAIN:
    LED = 1 ' Turn ON LED
    PAUSE 1000 ' Wait 1 second
    LED = 0 ' Turn OFF LED
    PAUSE 1000 ' Wait 1 second
    GOTO AGAIN ' Repeat forever
    END ' End of program
    Attached Images Attached Images  

  4. #4
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    Lightbulb

    Ok Luxor

    Bingo : You simply forgot to write the chip A/D relevant registers config and define I/Os for your chip ...

    Code:
    DEFINE OSC 4             ' Default Osc freq
    DEFINE OSCCAL_1K 1   ' retrive the trimming value
    
    CMCON		= 7 ' disable Analog comparators
    
    GPIO 		= %00000000 'All pins LOW at startup
    
    TRISIO 		=%00101000  'set GPIO3 & GPIO5 as inputs
    so, add those lines to the top of code.

    AND do not forget to connect the RESET PIN ...

    a look to the 629 Datasheet will help !

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  5. #5
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    Default Thank you very much for your help

    I'l try as soon as possible.
    Thanks again.

  6. #6
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    Default At last, the project is finished

    I had many problem and brain damage because I used MPASM as assembler instead of PM.EXE (I used MicroCode Studio too). Simply line like
    Code:
    @ device  pic16F628, intrc_osc_noclkout
    gave me strange error codes...
    But now, the project is working. I hope somebody find it useful.
    Thanks all of you for help.

    Code:
    '************************************************* ********
    ' LED FLASHING PROGRAM
    ' ======================
    ' PIC16F628 20I/P
    ' Pic Basic Pro Compiler 2.45, (c) 1998, 2004 microEngineering Labs, Inc.
    ' Assembler used is PM.EXE, provided with microEngineering Labs PICBasic Compiler
    '
    ' This program flashes an LED connected to port RB0 of PORTB. The
    ' LED is flashed with 1 second intervals.
    '************************************************* ************
    '
    INCLUDE "modedefs.bas"
    '
    @ device  pic16F628, intrc_osc_noclkout; Use internal oscilator
    @ DEVICE pic16F628, MCLR_OFF ; Turn off internal reset (default) and leave RA.5 as an input
    '
    DEFINE OSC 4             ' Default Osc freq
    CMCON     = 7          ' PortA = digital I/O
    VRCON     = 0          ' A/D Voltage reference disabled
    TRISB     = %00000000  ' PORTB all pins outputs
    '
    ' Define RB0 as LED (pin number 6):
    LED VAR PORTB.0 
    ' VSS - pin number 5  (Ground)
    ' VDD - pin number 14 (+5V)
    ' MCLR (pin number 4) pulled-up to VDD by 4.7Ko resistor 
    '
    'program start
    AGAIN:
        LED = 1 ' Turn ON LED
        PAUSE 1000 ' Wait 1 second
        LED = 0 ' Turn OFF LED
        PAUSE 1000 ' Wait 1 second
        GOTO AGAIN ' Repeat forever
    END ' End of program

  7. #7
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    Wink

    Hi,Luxor

    I see on your listing you missed that :

    http://www.melabs.com/downloads/P245A1.EXE

    this is an official patch for your PBP 2.45 version ...

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  8. #8
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    Jan 2010
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    Default


    Thank you very much, Alan.

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