Thread: Simple C programming question

  1. #1
    Registered User
    Join Date
    Mar 2010

    Simple C programming question

    Hello all,

    I have a simple question that deals with programming a PIC 12F675 micro controller using C.

    A little background: I have a comparator circuit in front of the PIC chip supplying either about 1.8V or 0V. These levels are supposed to act as either 'logic high' or 'logic low'.

    Basically I want the chip to read the logic high at an input and fire off 2 logic high signals at 2 separate outputs. If the chip reads a logic low, I want it to do nothing.

    I wanted to set a threshold level at 1.8V so the chip would interpret this or anything higher as 'logic high' since i can't get the full 5V to it. If the chip sees anything less than 1.8V, I want it to be considered logic low.

    My previous approach was to use the A2D converter built into the chip. The number 96 comes from the 1:64 prescalar and is supposed to represent 1.8V.

    I know this is simple and I may be way off. Any help is much appreciated!!!!!!!!!
    .................................................. .................................................. ..............
    #include <pic.h>


    CMCON = 0b0000011; // Disable comparator
    ANSEL = 0b00111000; // Enable ADC
    ADCON0 = 0b00000001; // Turn on AD Control Register
    OPTION = 0b10000101; // Configure TMR0 with 1:64 prescalar
    TRISIO = 0b00111100; // Configure GP1 as ADC output
    // Configure GP0 as LED output
    // Configure GP4 as ADC input signal

    GPIO1=0; // Initially set ADC output low
    GPIO0=0; // Initially turn the LED off



  2. #2
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  3. #3
    Registered User
    Join Date
    Feb 2008
    Delaware (USA)
    Hi Boxo, you may also want to post your project on the PIC12F6xx forum at Microchip Technology User Forums

  4. #4
    Registered User
    Join Date
    Mar 2010
    Thanks for the comments back..I actually got it working after 12 hrs of coding. Mountain dew made a lot of $ off me.

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