ProblemwithPWMfrequency


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  1. #7
    Join Date
    Oct 2011
    Posts
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    Default Re: ProblemwithPWMfrequency

    Thankx it compile fine but the output is stationary. I 'm confusing why is it.I attach simulation of the output as seen from ISIS

    [CODE]
    define OSC 4
    Wsave var byte $70system
    Wsave1 var byte $A0system
    Wsave2 var byte $120system
    Wsave3 var byte $1A0system
    ADCON0 = %00000000
    ADCON1 = %00000000
    LED1 VAR PORTB.1

    TRISB = %11111101
    TRISC = %11111001 'PMW output for CCP1 AND CCP2
    TRISA = %11111111
    PR2 = 199 'set for 5Khz HPWM
    CCP1CON = %00001100 'set CCP1 for PWM OPERATION
    CCP2CON = %00001100 'set CCP2 for PWM OPERATION
    T2CON = %00000100 'TIMER2ON and prescale of 1:1
    index var byte
    temp var word
    timerone var word
    INCLUDE "DT_INTS-14.bas"
    INCLUDE "ReEnterPBP.bas"
    ASM

    INT_LIST macro ; IntSource, Label, Type, ResetFlag?
    INT_Handler TMR1_INT, _TEST, PBP, yes
    endm
    INT_CREATE ; Creates the interrupt processor
    ENDASM

    T1CON = 000001 ; Prescaler = 1;1, TMR1 ON
    @ INT_ENABLE TMR1_INT ; Enable Timer 1 Interrupts

    timerone = 64980 ;gives about 50 htz sine
    Main:
    PAUSE 5

    GOTO Main
    TEST:
    T1CON = 000000 'stop the timer
    TMR1L = timerone.byte0 'reload the timer
    TMR1H = timerone.byte1
    T1CON = 000001 ' start the timer
    gosub display
    CCP1CON.4 = Temp.0 ' bit 0
    CCP1CON.5 = Temp.1 ' bit 1
    CCPR1L = Temp>>2 'Bit 2-7
    index=index+1
    if index =36 then index =0

    @ INT_RETURN
    Code:
     
     display:
      lookup index,[115,102,90,79,70,62,57,53,52,53,57,62,70,79,90,102,115,128,141,154,166,177,186,194,199,203,204,203,199,194,186,177,166,154,141,128],temp
        
      return    'return to the subroutine 
      return    'return to the original GOSUB
    Attached Images Attached Images

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