Hardware PWM (HPWM) Clairification on 18F45K22

[neondale]

I normally like to code all of my own hardware using the direct access to registers however PBP has included a very nice HPWM Command that makes all of this very simple... However i feel a bit confused as to what is all required in the code to make the HPWM function work correctly in PBP3.

Does anyone have an simple and or basic code that can be used for my 18F45K22 device?

The 18F45K22 has select-able ccp channels and it is unclear to me (even after reading the datasheet section) how to align these cpp channels correctly using the registers.

I am using 4 LED's that i would like to control using HPWM. I am running the cpu from its internal 16Mhz OSC

LED 1: RC2/CCP1
LED 2: RC1/CCP2
LED 3: RE0/CCP3
LED 4: RD1/CCP4

I have already set the pins. but I am not sure about the additional registers and defining the timers. Example "define CCP1_REG & define CCP1_BIT" etc...

TRISC.2 = 0 ' Set Pin to Output
ANSELC.2 = 0 ' Set Pin to Digital
Mode_LED_R var PortC.2 ' Digital PWM Output: Mode LED Red Element

TRISC.1 = 0 ' Set Pin to Output
ANSELC.1 = 0 ' Set Pin to Digital
Mode_LED_G var PortC.1 ' Digital PWM Output: Mode LED Green Element

TRISE.0 = 0 ' Set Pin to Output
ANSELE.0 = 0 ' Set Pin to Digital
Mode_LED_B var PortE.0 ' Digital PWM Output: Mode LED Blue Element

TRISD.1 = 0 ' Set Pin to Output
ANSELD.1 = 0 ' Set Pin to Digital
Bluetooth_Link_LED var PortD.1 ' Digital PWM Output: Blue Link Status LED


define HPWM1_TIMER 1
define HPWM2_TIMER 2
define HPWM3_TIMER 3
define HPWM4_TIMER 4
CCP1CON = %00001100 ' Turn CCP1 to PWM Mode
CCP2CON = %00001100 ' Turn CCP2 to PWM Mode
CCP3CON = %00001100 ' Turn CCP3 to PWM Mode
CCP4CON = %00001100 ' Turn CCP4 to PWM Mode
CCP5CON = %00000000 ' Dissable Comparator / PWM Module


Any help or example code of how to use the HPWM on this chip would be GREATLY Appreciated!!!

[Demon]

I haven't used HPWM yet, but DEFINES must be in uppercase.

Robert

[Darrel Taylor]

Demon,

The word "define" is a PBP statement, and PBP is not case sensitive. So it doesn't matter what case DeFiNe is.
What follows "define" is passed on to the assembler, and MPASM IS case sensitive.

Any defines that PBP is expecting to see, must be UPPERCASE because that's what PBP is looking for.
Defines used in your own assembly language routines can be any case, as long as your code is looking for the same case.

neondales's defines have the correct case , even though they are unnecessary and use the wrong timers.

neondale,

You don't need any of what you posted, except for the ANSEL's.
And since you are just fading LED's, the CCP's can all run off of the same Timer, which is TIMER2 by default.

Here's a program that starts up CCP1-4 at 3Khz - 50% dutycycle.
Note that the default location for CCP3 is PORTB.5.
You can move it to PORTE.0 by changing the CCP3MX_ configuration bit.
If you move it ... change the CCP3 defines to match.

;----[Device Configuration]--(See manual section 4.9)---------------------------
#CONFIG
    __config  _CONFIG1H, _FOSC_INTIO67_1H & _PLLCFG_ON_1H & _PRICLKEN_ON_1H & _FCMEN_ON_1H & _IESO_ON_1H
    __config  _CONFIG2L, _PWRTEN_OFF_2L & _BOREN_SBORDIS_2L & _BORV_190_2L
    __config  _CONFIG2H, _WDTEN_ON_2H & _WDTPS_32768_2H
    __config  _CONFIG3H, _CCP2MX_PORTC1_3H & _PBADEN_OFF_3H & _CCP3MX_PORTB5_3H & _HFOFST_ON_3H & _T3CMX_PORTC0_3H & _P2BMX_PORTD2_3H & _MCLRE_EXTMCLR_3H
    __config  _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
#ENDCONFIG

;----[DEFINEs]------------------------------------------------------------------
DEFINE OSC 4               ; Oscillator is 4Mhz

DEFINE CCP1_REG PORTC      ; Tell PBP which pins the CCP outputs are on
DEFINE CCP1_BIT 2
DEFINE CCP2_REG PORTC
DEFINE CCP2_BIT 1
DEFINE CCP3_REG PORTB
DEFINE CCP3_BIT 5
DEFINE CCP4_REG PORTD
DEFINE CCP4_BIT 1

;----[Aliases]------------------------------------------------------------------
LED       PIN 0       ; LED on PORTB.0

;----[Variables]----------------------------------------------------------------
Duty      VAR BYTE    ; Duty Cycle 
Chan      VAR BYTE    ; HPWM Channel
FadeDir   VAR BYTE    ; Fade Direction (1=up, -1=down)

;----[Constants]----------------------------------------------------------------
Freq      CON 3000    ; HPWM Frequency
MaxBright CON 180     ; Maximum Fade Brightness

;----[Initialize]---------------------------------------------------------------
OSCCON = %01010000    ; 4Mhz Internal OSC

ANSELA = 0            ; All Digital
ANSELB = 0
ANSELC = 0
ANSELD = 0
ANSELE = 0

FadeDir = 1           ; Start fading up
Duty = 127            ; 50% dutycycle
;GOTO Fade1            ; Run Fading Routine

HPWM 1, Duty, Freq    ; start the Hardware PWM channels
HPWM 2, Duty, Freq
HPWM 3, Duty, Freq
HPWM 4, Duty, Freq

;----[Main Program Loop]--------------------------------------------------------
Main:
    TOGGLE LED
    PAUSE 500
GOTO Main


;----[Fade all channels up and down]---------------------------------------------
Fade1:
    FOR Chan = 1 TO 4
        HPWM Chan, Duty, Freq
    NEXT Chan
    IF Duty = MaxBright THEN FadeDir = -1
    IF Duty = 0 THEN FadeDir = 1
    Duty = Duty + FadeDir
    PAUSE 10
GOTO Fade1

Uncomment the GOTO Fade1 to run the Fade routine.

[neondale]

Thanks for the Help on the Config Bits and Defines!

[CuriousOne]

I've used it on 628A without any defines, just HPWM command.

[Darrel Taylor]

I've used it on 628A without any defines, just HPWM command.

The 16F628A only has one CCP module, and it's output cannot be moved to a different pin.

The 18F45K22 has 5 CCP modules, and two of them can be moved to different pins.