Help with HPWM on 18f6520

[Andy Wood]

Hello,

My first post here so don't be too hard on me!!

I am currently playing with the HPWM command on the 18F6520. It works ok on CCP1 and CCP2 but I cannot get it to work on CCP 3,4 or 5.

I have tried a few different setup configurations, however, at present I am stuck!

Any help or ideas would be greatly apprciated.

Andy

[skimask]

Hello,

My first post here so don't be too hard on me!!

I am currently playing with the HPWM command on the 18F6520. It works ok on CCP1 and CCP2 but I cannot get it to work on CCP 3,4 or 5.

I have tried a few different setup configurations, however, at present I am stuck!

Any help or ideas would be greatly apprciated.

Andy

Can't see no code, can't give no help.

[Andy Wood]

Thanks for the reply Skimask.

Here is a copy of the code:

main:

HPWM 1,127,245

HPWM 2,127,245

HPWM 3,127,245

HPWM 4,127,245

HPWM 5,127,245

GOTO main

When using a 5v supply, this produces 2.5v on CCP channels 1 and 2, and 0v on CCP channels 3,4 and 5 (which are on port G).

I also tried adding TRISG = 0 at the start, to force CCP 3,4 & 5 to outputs but nothing changed.

Andy

[skimask]

Thanks for the reply Skimask.
Here is a copy of the code:
main:
HPWM 1,127,245:HPWM 2,127,245:HPWM 3,127,245:HPWM 4,127,245:HPWM 5,127,245:GOTO main
When using a 5v supply, this produces 2.5v on CCP channels 1 and 2, and 0v on CCP channels 3,4 and 5 (which are on port G).
I also tried adding TRISG = 0 at the start, to force CCP 3,4 & 5 to outputs but nothing changed.
Andy

That's it? No defines, don't know how fast the oscillator is runng, no registers set up, no nothing?
Read the manual, try again...

[Bruce]

HPWM only works with CCP1 & CCP2. Beyond that, you'll need to manually configure hardware PWM.

[Andy Wood]

Hello Bruce,

Thanks for the reply. I have read the manual and cannot find where it says HPWM is only for CCP1 and CCP2. Maybe this is an undocumented "feature"?

Anyway, I do appreciate your response - I have been pulling my hair out! Thank you for your input.

Andy