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Discussion Groups | Piclist | PWM for Hobby Motor using P16F685 no CCP output
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
PWM for Hobby Motor using P16F685 no CCP output - Bob Lynch - Aug 27 7:57:19 2008
Can anyone see a problem with this code, just looking for a duty
cycle. Thanks
;*********************************************************************
*
;
; Filename: PWM071308.asm
; Date: 6/15/08
; File Version: 1.00
;
; Author: Bob Lynch
;*********************************************************************
*
;
; Files required:
; p16F685.inc
;*********************************************************************
*
#include ; processor specific variable
definitions
__CONFIG _CP_OFF & _CPD_OFF & _MCLRE_OFF & _WDT_OFF &
_PWRTE_ON & _INTRC_OSC_NOCLKOUT & _FCMEN_OFF & _IESO_OFF
org 0x0000
Start:
banksel OSCCON ; Bank 1
movlw B'01110111' ; Internal oscillator frequency = 8 MHz
movwf OSCCON
;banksel PORTC ; Bank 0
;clrf PORTC ; Init PortC
banksel CM1CON0 ; Bank 2
movlw b'00000111'
movwf CM1CON0 ; Turn comparators off
banksel ANSEL ; Bank 2
clrf ANSEL ; Turn off ADC
clrf ANSELH
;1. Disable the PWM Pin.
banksel TRISC ; Bank 1
movlw 0xFF
movwf TRISC ; Disable the P1B PWM Pin
;2. Set the PWM period by loading the PR2 register.
banksel PR2 ; Bank 1
movlw 0x3F ; Load the count of 31.2kHz 8-bit rez in
PR2
movwf PR2 ; PWM period is set by PR2 register of
timer2.
;3. Configure CCP Module.
banksel CCP1CON ; Bank 0
movlw b'00001100'
movwf CCP1CON ; Set CCP1M2 to 1100 for PWM Mode
;4. Set Duty Cycle.
banksel CCPR1L ; Bank 0
movlw 0X00
movwf CCPR1L ; Duty Cycle is 25% of PWM Period
;5. Set Timer2.
bcf PIR1,TMR2IF ;
banksel T2CON ; Bank 0
movlw b'00000100'
movwf T2CON ; Set prescale & Start Timer2
;6. Enable PWM Output.
PWM_Period_Match
btfss PIR1,TMR2IF
goto PWM_Period_Match
banksel TRISC ; Bank 1
clrf TRISC ; Enable the P1B PWM Pin
end
------------------------------------
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cycle. Thanks
;*********************************************************************
*
;
; Filename: PWM071308.asm
; Date: 6/15/08
; File Version: 1.00
;
; Author: Bob Lynch
;*********************************************************************
*
;
; Files required:
; p16F685.inc
;*********************************************************************
*
#include
definitions
__CONFIG _CP_OFF & _CPD_OFF & _MCLRE_OFF & _WDT_OFF &
_PWRTE_ON & _INTRC_OSC_NOCLKOUT & _FCMEN_OFF & _IESO_OFF
org 0x0000
Start:
banksel OSCCON ; Bank 1
movlw B'01110111' ; Internal oscillator frequency = 8 MHz
movwf OSCCON
;banksel PORTC ; Bank 0
;clrf PORTC ; Init PortC
banksel CM1CON0 ; Bank 2
movlw b'00000111'
movwf CM1CON0 ; Turn comparators off
banksel ANSEL ; Bank 2
clrf ANSEL ; Turn off ADC
clrf ANSELH
;1. Disable the PWM Pin.
banksel TRISC ; Bank 1
movlw 0xFF
movwf TRISC ; Disable the P1B PWM Pin
;2. Set the PWM period by loading the PR2 register.
banksel PR2 ; Bank 1
movlw 0x3F ; Load the count of 31.2kHz 8-bit rez in
PR2
movwf PR2 ; PWM period is set by PR2 register of
timer2.
;3. Configure CCP Module.
banksel CCP1CON ; Bank 0
movlw b'00001100'
movwf CCP1CON ; Set CCP1M2 to 1100 for PWM Mode
;4. Set Duty Cycle.
banksel CCPR1L ; Bank 0
movlw 0X00
movwf CCPR1L ; Duty Cycle is 25% of PWM Period
;5. Set Timer2.
bcf PIR1,TMR2IF ;
banksel T2CON ; Bank 0
movlw b'00000100'
movwf T2CON ; Set prescale & Start Timer2
;6. Enable PWM Output.
PWM_Period_Match
btfss PIR1,TMR2IF
goto PWM_Period_Match
banksel TRISC ; Bank 1
clrf TRISC ; Enable the P1B PWM Pin
end
------------------------------------
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(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )