[Flashforth-devel] Fwd: PWM at PIC18F2620

[Thomas B. <bus...@gm...>]

---------- Forwarded message ----------
From: Thomas Buschhardt <bus...@gm...>
Date: 2014-07-21 23:21 GMT+02:00
Subject: Re: [Flashforth-devel] PWM at PIC18F2620
To: Mikael Nordman <mik...@pp...>


Hallo, thats a correct failure :-)
But after changing the value to the correct RB3, nothing happens. I tested
also with 100% dutycycle but no signal came from this pin.
I use also the values of this calculator:
http://www.micro-examples.com/public/microex-navig/doc/097-pwm-calculator.html,
but no luck.

Thanks Thomas


2014-07-21 22:53 GMT+02:00 Mikael Nordman <mik...@pp...>:

> Are sure you are using rb3 ?
>
>
>
> Your code is making rb2 an output.
>
>
>
> Mike
>
> Sent from my LG Mobile
>
>
>
>
>
> ------ Original message------
>
> *From: *Thomas Buschhardt
>
> *Date: *Mon, 21/07/2014 19:53
>
> *To: *flashforth-devel;
>
> *Subject:*[Flashforth-devel] PWM at PIC18F2620
>
>
> Hallo FFFans,
>
> I try to run PWM on a PIC18F2620 with no success (I dont see any spike in
> the logic analyzer). Here are my parameters:
>
> Tosc 8 MHz
> Periode: 36 KHz
> Duty Cycle: 25%
> Output is RB3/CCP2 Pin24
> Pre- Postscaler: 1
>
> And here my Programm:
>
> -pwm
> marker -pwm
> $ff81 constant portb
> $ff93 constant trisb
> $ffba constant ccp2con
> $ffcb constant pr2
> $ffbb constant ccpr2l
> $ffcc constant tmr2
>  $ffca constant t2con
>
> : init
> \ Set the PWM period by writing to the PR2 register.
> %00110110 pr2 c! \ #54 Periode: 0,0000275 s / Prescaler: 1 / Tosc: 8MHz
> \ Set PWM dutycycle to the CCPR2L register and CCP2CON<5:4> bits
> \ dutycyle: 25% = #56 (10bit) = %0000 1110 00
> %00001110 ccpr2l c!
> %00110000 ccp2con mclr
> \ Make the CCP2 pin an output by clearing the appropriate TRIS bit.
> \ RB3/CCP2 output
> %00000100 trisb mclr
> \ Set the TMR2 prescale value, then enable Timer2 by writing to T2CON.
> 0 tmr2 c! \ reset tmr2
> %00000100 t2con c! \ prescale 1, timer2 is on
> \ Configure the CCPx module for PWM operation.
> %00001100 ccp2con c!
> ;
>
> What I missed ?
>
> Thank you for looking.
> Thomas
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