16F1824 "HPWM 2" woes (command seemingly forces PortC.3 from analogue to digital)

[mtripoli]

Never mind...

[HankMcSpank]

Well, for all my quick 'n dirty the workaround reverts my pin9 (PortC.1) ADC back to how it should be...

HPWM 2, duty, 32767
TRISC.1 =1   'Remake PIN 9 PortC.1 an input again following HPWM command

....the actual HPWM command itself is still playing havoc with the signal....when I feed a steady sine wave into the ADC pin, it getting chopped up as viewed on a scope, as when the HPWM 2 command runs it interferes with PortC.1 - my now (naive) thinking is that it's forcing the pin to be an output, which then drags my sine wave analogue input signal down to zero, then my 'kludgey' follow on command makes the pin an input again...which restores the signal. But you can imagine the end result, it's as if a switch is being flicked rapidly thereby shunting the signal to ground .....fugly.

i'm exhausted on this one & don't have an immediate good solution...I need to sleep on it (still a high possibility I'm just doing something wrong as my head is fuzzy now!). Tomorrow, I may sit down & work out how do do HPWM longhand using the PICs registers (one whole days lost on something as simple as this....eek!)

[Bruce]

DEFINE CCP2_REG PORTC
DEFINE CCP2_BIT 3

Should take care of it. PBP defaults to PORTC.1 for CCP2 if you don't tell it otherwise.

[HankMcSpank]

Thanks Bruce ...that did it....you've just made an impossibly bad day...just bad now

Like I say it's my first time using the 2nd HPWM channel ....but also my first time using this newish PIC in anger - thought i was going crazy.

PWM, SHmeeWM.....

[Ioannis]

These new 16F18xx chips are small in the eye but really beasts!

I had my difficult time in setting them too, but nowI really like them.

Here is my setup for the 1827 which may help others to take into accoun the registers and not forget any of them.

Of course this is my setup and other need to make their own. It just as an example.

  TRISB = %11000101
  TRISA = %11111100
  
  ADCON0 = %00000001
  ADCON1 = %11110011

  ANSELA = %00011100           ' all digital. A/D disabled
  ANSELB = %01000000
  
  APFCON0 = %00100000
  APFCON1 = %00000001
    
  BAUDCON = %00011000
  
  CCP1CON = %00111100          'Control of CCPx modules
  CCP2CON = %00000000
  CCP3CON = %00000000
  CCP4CON = %00000000

  CM1CON0.7=0
  CM2CON0.7=0
  
  CPSCON0 = 0
  CPSCON1 = 0 
  
  DACCON0 = 0
  
  FVRCON = %10000011
  
  INTCON = %11000000   ' global & peripheral ints enabled
  
  OPTION_REG = %10000111    'Tmr0 from 256 presc and Int Clock
  
  PIR1 = 0             ' clear TMR1 int flag                     
  PIE1 = %00000001     ' TMR1 int enabled
  
  T1CON = %00110000    ' TMR1 1:8 prescale, timer1 on
  
  WPUB=%11000000
  
  'hpwm 1,0,2000
  DEFINE CCP1_REG PORTB
  DEFINE CCP1_BIT 3    
  ccptmrs=0
  pr2=249
  ccp1con=$0C

HTH,

Ioannis

[HankMcSpank]

I concur...the 16F182x are a great range of chips...absolutely chocka with features.

I can't say I've had a lot of setup problems with them (certainly nothing that wasn't obvious when I complied)....other than this pesky HPWM 2 issue, the one other issue I had Darrel kindly helped sort....

I needed to modify the 16F1824.INC file (mods in red)....

;****************************************************************
;*  16F1824.INC                                                 *
;*                                                              *
;*  By        : Leonard Zerman, Jeff Schmoyer                   *
;*  Notice    : Copyright (c) 2010 microEngineering Labs, Inc.  *
;*              All Rights Reserved                             *
;*  Date      : 09/14/10                                        *
;*  Version   : 2.60b                                           *
;*  Notes     :                                                 *
;****************************************************************
        NOLIST
    ifdef PM_USED
        LIST
        "Error: PM does not support this device.  Use MPASM."
        NOLIST
    else
        LIST
        LIST p = 16F1824, r = dec, w = -302
        INCLUDE "P16F1824.INC"	; MPASM  Header
        ;__config _CONFIG1, _FOSC_HS
        ;__config _CONFIG2, _PLLEN_OFF & _LVP_OFF
        NOLIST
    endif
        LIST
BLOCK_SIZE	EQU	32
CCPTMRS0 = CCPTMRS

The first two mods (semi colons) are standard fayre, but that last one would have taken me a good few years to get to the bottom of on my own.

[Ioannis]

What version of MPLAB do you have?

On my 8.56 and in 1827.inc file of the MPLAB Suite there are two lines (BANK5 grroup):

CCPTMRS          EQU  H'029E'
CCPTMRS0         EQU  H'029E'

But on 1824.inc there is only one:

CCPTMRS          EQU  H'029E'

So it may have to do with the update of MPLAB. Anyone with newer version?

Ioannis