hpwm more than 2 ch possible in pbp?????????

[mister_e]

is this LED flickering happen only with channel2 ? what about if you change the frequency?

[oscar]

hiya lads...

hmmmmm ch3 ie the one i couldnt get to work in the firsr place works 100% nice smooth dimming etc.. ch2 flickers like mad !! the code is the exact same for all 3 ch's with the exception of register names etc.

me thinks this is not possible...................... i have gone through everything here 10 times over.!!!

[Bruce]

What happens if you enable only 1 channel at a time?

I.E. CCP1CON=0 : CCP3CON=0

Does channel 2 still flicker?

Are you sure it's not the circuit channel 2 is connected
to that's causing the flicker?

[oscar]

yet again tis me thats at fault.... many thanx to bruce for his code example. the mistake i was making was that i was calling the hpwm routine which seemed to be causing a conflict. instead i just wrote the duty val directly to the port ie portb.5=duty5 ... simple! lol this took many hours of hair loss and alcohol !!!!!!. only 1 teeny weeny prob left lol... i cant get the ch's to go to full off . they get to say 9% and stay there. so a faint glow is visible but apart from that everything is aok. dimming is as smooth as a babys ass and im a happy bunny.( irish saying).. many many thanks to bruce n the rest of u guys.. slainte...

thanx
oscar.

[peu]

Im refloating this thread because I have a question:

I tried the example provided by Bruce succesfully, but now I want to use ON Interrupt on portb changes.

The problem I encounter is that CCP3 uses RB5 and the interrupt is triggered by changes in the portb.4 to portb.7

What can be done?

Thanks

[mister_e]

Help us a litle bit Pic model?

How bad/good it is if in the INT routine you test the PORTB and if it's just related to the HPWM, it goes out of there ?

[peu]

Sorry Im using the same pic as Bruce example: 16F767

but Im having more basic problems, when I wasnt able to run the program as desired I started to remove parts of it, and now I see it does not work at all, so I may be missing some register configuration.

Here is the header of my program:

@ device pic16F767, wdt_on, intrc_osc_noclkout, mclr_off, protect_off


trisb   =%11000000
trisa   =%00000001
cmcon   =%00000111  'Comparators Off
intcon  =%10001000  'interrupts enable    

; Set CCP modules to PWM mode
CCP1CON = %00001100 ' Mode select = PWM
CCP2CON = %00001100 ' Mode select = PWM
CCP3CON = %00001100 ' Mode select = PWM

PR2 = $20    ; Set period 

pie2.1=0    ;disable interrupts on CCP3 (I think this should work)

; Set TMR2 up for 1:1 prescale & turn it on
T2CON = %00000100 ' TMR2 ON 1:1 prescale

porta=0:portb=0:portc=0

pause 100


high porta.1
pause 200
low porta.1
pause 200
high porta.1
pause 200
low porta.1

end

As you can see very basic, and I dont even started with the pwm/interrupts stuff.

I program the pic via ICSP and power it, it seems to run at turtle speed , the 200ms pause takes 28seconds...


What I am missing? Thanks