DT Multiple Software PWM and 18F2321 issue


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  1. #1
    Join Date
    Aug 2005
    Posts
    20

    Default DT Multiple Software PWM and 18F2321 issue

    Hello, I'm trying to let SPWM_INT.bas work with a pic18F2321. Before ask here I tested it on a 18F1320 and it work perfectly. OSC HS 20MHz
    take this as example:
    Code:
    for i=0 to 250
      LED=i 'dimm led by use pwm
      PAUSE 10
    high portb.0 'switch on a led
    for i=250 to 0 step -1
      LED=i 
      PAUSE 10
    next i
    low portb.0
    The problem I encountered is that with 18F2321 LED on portb.0 don't switch on/off while pwm dimming works fine. To be more precise it switch on for very few ms then switch off. Another strange thing is that it seems I can't set SPWM_FREQ > 100 because I receive all these errors:
    error Current SPWM configuration is INVALID - NO time left between interrupts
    messg 1 - Try using a "SPWM_FREQ" lower than SPWM_FREQ Hz
    messg 2 - OR, Try using a "SPWM_RES" lower than SPWM_RES
    messg 3 - OR, Use a faster "OSC" than OSC Mhz
    messg 4 - OR, Use fewer SPWM channels
    Probably there are some changes to do, maybe in DT_INTS-18.bas.
    can someone help me?
    Regards

  2. #2
    Join Date
    Aug 2005
    Posts
    20


    Did you find this post helpful? Yes | No

    Default Re: DT Multiple Software PWM and 18F2321 issue

    Solved!
    I just rececked it and I missed to add ADCON1=$0F
    thx

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