PWM.asm

PWM
    ; Pulse width modulation
    BANKSEL TRISA ; Set bank
    BSF TRISA,5 ; Disable the PWMx pin output driver(s) by setting the associated TRIS bit(s)
    
    BANKSEL PWM5CON ; Set bank
    BCF PWM5CON,PWM5POL ; Configure the PWM output polarity by configuring the PWMxPOL bit of the PWMxCON register.
    
    ; Load the PR2 register with the PWM period value
    BANKSEL PR2 ; Set bank
    MOVLW 0x20 ; Calculated with the help of equation 18-1 on page 168
    MOVWF PR2
    
    ; Load the PWMxDCH register and bits <7:6> of the PWMxDCL register with the PWM duty cycle value
    ; TODO Flyt MOVLW og slet, til når vi får data - Den power vi indlæser
    BANKSEL PWM5DCH ; Set bank
    MOVLW B'10000000'  ; Beregnet ved hjælp af formel 18-2 side 168
    MOVWF PWM5DCH
    
    BANKSEL PWM5DCL ; Set bank
    MOVLW B'00000000' ; Beregnet ved hjælp af formel 18-2 side 168
    MOVWF PWM5DCL
    
    ; Configure and start Timer2
    BANKSEL PIR1 ; Set bank
    BCF PIR1,TMR2IF
    
    ; Sæt en timer prescale value til 1
    BANKSEL T2CON ; Set bank
    BCF T2CON,0
    BCF T2CON,1
    
    ; Enable Timer2
    BSF T2CON,TMR2ON
    
    BANKSEL PIR1 ; Set bank
    WAIT_ON_TIMER BTFSS PIR1,TMR2IF
	GOTO WAIT_ON_TIMER
	
    ; When the TMR2IF flag bit is set: 
    ; Clear the associated TRIS bit(s) to enable the output driver.
    BANKSEL TRISA ; Set bank
    BCF TRISA,5
    
    BANKSEL PWM5CON ; Set bank
    BSF PWM5CON,PWM5EN ; Enable the PWMx module
    
    GOTO PWM