I use dual PWM on the 16F874,16C77 and 16C74 basically the initialization is
pretty similar to what you have below, except the following comments

My initialization is as follows,

        CCP1CON = 0x00;
        CCP2CON = 0x00;
        CCP1CON = 0b00001100;
        CCP2CON = 0b00001100;
        T1CON   = 0b00000101;
        T2CON   = 0b01111110;  // timer 2 pre/post scaler
        PR2     = 0xff;        // slowest possible pwm freq..
        TMR2    = 0x00;

Actually driving the pwm outputs is done as follows.

void SetPWM2 ( unsigned int w)
{
        CCP2Y = w & 0x01;
        CCP2X = w & 0x02;
        CCP2RL= w>>2;
}

void SetPWM1 ( unsigned int w)
{
        CCP1Y = w & 0x01;
        CCP1X = w & 0x02;
        CCP1RL= w>>2;
}


Hope this helps.


>HI All, I am having problems with the following snippet - it sets up the
>PWM1 output ok
>but I get nothing from the second pwm output. I have even resorted to a chip
>swap to check the controller. Adding a BSF to assert the pin works, but the
>pwm does not.
>any advice gratefully received
>thanks
>rob symmans
>
>
>
>        CALL    INIT_PORTS
>
>        MOVLW   0XFF                    ; 00 --> W
>        BSF     STATUS, RP0             ; SELECT BANK 1
>        MOVWF   PR2                     ; LOAD PR2 WITH PERIOD INFO
>                                                ; AT 20MHZ PR2=FF GIVES A
>1.22KHZ
>                                                ; AT 4MHZ PR2=FF GIVES A
>3.906KHZ
>        BCF     STATUS, RP0             ; SELECT BANK 0
>        MOVLW   0X80                    ; LOAD W WITH 0X80
>        MOVWF   CCPR1L          ; DUTY CYCLE IS ~50% OF PWM 1 PERIOD
>        MOVWF   CCPR2L          ; DUTY CYCLE IS ~50% OF PWM 2 PERIOD
>        BSF     T2CON, T2CKPS1  ; SET THE TMR2 PRESCALE VALUE
>        BSF     T2CON, T2CKPS0  ; SET THE TMR2 PRESCALE VALUE
>        BSF     T2CON, TMR2ON   ; ENABLE TIMER2
>        MOVLW   0X0F                    ;
>        MOVWF   CCP1CON         ; SET LOW TWO BITS OF PWM 1 AND TURN IT ON
>        MOVWF   CCP2CON         ; SET LOW TWO BITS OF PWM 2 AND TURN IT ON
>                                               ; PWM HAS 10-BITS OF
>RESOLUTION
>
>HERE    GOTO    HERE
>
>INIT_PORTS
>        MOVLW   B'00000000'
>        MOVWF   TRISC
>        RETURN
>
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Ray Gardiner ray@dsp.com.au
mail from: dsp systems

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