Dear all,
My servos actually worked with a 250 Hz period (strange according to the specs) at 4 MHz and I have the maximum resolution of  14 bits though I can only use 10...
My problem is that when I activate the second CCP channel the overflow interrupts are getting confused and as a result, my first servo works perfectly but the second one has a delay at the beginning and then I get a duty cycle of 70us.  Can someone check my code please?

;############################################################################
; Author :  Antonis Iliopoulos                     ;
; Date :      03 / 02 / 05                     ;
; Title:      2 CCP channels with fixed PWMs                 ;
;                            ;
; Description: The following program was created to produce a PWM signal through the        ;
; CCP channel on RC2 that will set the motor to a fixed position  by entering the appropriate
;value in CCPR1L and CCP1 CON and does the same for CCP in RC1 by  entering the
;appropriate value in CCPR2L and CCP2 CON 
;############################################################################
        list    p=16f777
        include<p16f777.inc>
;------------------------------------------------------------
;internal oscillator at 4 MHz
;------------------------------------------------------------
#define ccp1  portc,2
#define ccp2  portc,1
      org     0x000

  
  banksel OSCCON    ; got to appropriate bank
  movlw b'01100000' ;Device is running from INTRC as a secondary system clock
 movwf   OSCCON  ; T1OSC is used for system clock at a stable frequency of 4MHz 

 movlw b'00000000' ;with 1 set inputs and with 0 set outputs
  movwf   trisb^0x080 ; portB is all outputs
  ;bcf  trisc,2  ;We clear ccp1 pin to make it output reference: 14.5  
  ;bcf  status,rp0 ;bank0

  ;bcf  ccp1  ;we set the ccp1 pin low
  BANKSEL TRISC ;GO TO THE APPROPRIATE BANK
  bcf  trisc,1  ;We clear ccp2 pin to make it output reference: 14.5  
  bcf  status,rp0 ;bank0

  bcf  ccp2  ;we set the ccp2 pin low
   bcf  status,rp0    
  bcf  intcon,7    ;disable global interrupts
  bcf  intcon,6    ;disable peripheral interrupts
  bsf  status,rp0  ;bank 1 

  bcf  pie1,1 ;disable timer 2 interrupts
  bcf  pie1,2 ;disable ccp1 interrupts
  bcf  pie2,0 ;disable ccp2 interrupt
   banksel pir1    ;GO TO THE APPROPRIATE BANK
  clrf pir1 ;No TMR2 to PR2 Match occured

  bcf  status,rp0 ;BANK 0
  clrf ccp1con     ;ccp1 module off
  clrf ccp2con     ;ccp2 module off
  bsf  status,rp0
  bcf  status,rp1    ;bank 1     

  movlw b'11111111' ; Period of approximately 250Hz
  movwf pr2 ;load period register
  bcf  status,rp0
  bcf  status,rp1 ;bank 0

  
  bsf  ccp1con,5   ;set bit 1 of duty cycle reg
  bcf  ccp1con,4   ;clear bit 0 of duty cycle reg - pwm
  movlw b'00101011' ;DUTY CYCLE
   movwf ccpr1l ;bits 9-2 of duty cycle
 
    ; Duty cycle for pwm 1 = '0010101110'
 
  bsf  ccp2con,5   ;set bit 1 of duty cycle reg
  bcf  ccp2con,4   ;clear bit 0 of duty cycle reg - pwm
  movlw b'10001010' ;DUTY CYCLE
  movwf ccpr2l ;bits 9-2 of duty cycle
   ; Duty cycle for pwm2 = '1000101010'
  
  bcf  status,rp0
  bcf  status,rp1 ;bank 0
  movlw b'00000011'   ;prescaler = 0 to be 1, 1 to divide by 4, 1x for 16
  movwf t2con       ;   
  clrf tmr2     ;clear tmr2

  movlw b'00001100' ;ccp1 pwm mode, ccp1 module on
  movwf ccp1con
  movlw b'00001100' ;ccp2 pwm mode, ccp2 module on
  movwf ccp2con
  banksel t2con  ; go to appropriate bank

  bsf  t2con,2 ;tmr2 on
  end

regards
 
Antonis






		
---------------------------------
 ALL-NEW Yahoo! Messenger - all new features - even more fun!  
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist