Updating HPWM frequently, safe?


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  1. #26
    Join Date
    Feb 2005
    Posts
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    I just tested it using this code:

    Code:
    '       Pic Configuration
    @ device pic12f683,INTRC_OSC_NOCLKOUT , wdt_on, mclr_off, protect_off        
    
    '       Hardware configuration
    
    '       I/Os
    TRISIO = %00010010      ' pin1 is ADC , pin4 is the calibration button
    
    '       ADC's
    ANSEL = %00000010  
    DEFINE ADC_BITS 10      ' ADCIN resolution  (Bits)
    DEFINE ADC_CLOCK 1      ' ADC clock source  (Fosc/8)
    DEFINE ADC_SAMPLEUS 11  ' ADC sampling time (uSec)                      
    ADCON0.7 = 1            ' Right justified results
    
    '       Comparator
    'CMCON0 = %00000111     ' Disable comparator
    'VRCON  = %00000000     ' disable
    cmcon0 = %00001110      ' Multiplexed Input with Internal Reference CIS=1
    vrcon  = %10001010      ' set vref=2.25v (from 4v input) 
    
    include "HPWM10.pbp"
    
    ' definitions
    pote 		var word
    Frequency   var word  ' edited after original post per Darrel suggestion
    calibraled  var gpio.5
    
    gpio=0
    frequency=1000
    pause 50    ' coffee break
    
    for pote=1 to 1023 
    
    @ HPWM10  1, _pote, _Frequency
    pause 10
    
    'gosub flashled
    
    next pote
    end
    
    flashled:
    high calibraled     ' I use this to visually count each loop step
    pause 50
    low calibraled      ' by using it I saw that my switcher starts to 
    pause 50            ' work at hpwm=4, less than that is too low
    high calibraled
    pause 50
    low calibraled
    pause 50
    high calibraled
    pause 50
    low calibraled
    pause 700
    return
    Comments:

    I used the flashing led routine to know when my switcher started to work, it started at hpwm=4 which is great, the power led is very dim at this value.

    then I removed the flashing routine and something was too fast, because my switcher was off. So I added a little pause in there and it was solved, tried 1, 5 and settled in 10ms where it started to work again.

    This is great!, now I will test it with adcin

    pablo
    Last edited by peu; - 7th May 2007 at 01:43.

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