HPWM on second half

[rmteo]

If you are into open libraries, take a look at Swordfish. Lots more features than PBP and less money. Only for PIC18F though.

[Bruce]

Swordfish is awesome, but isn't the entire library in Swordfish BASIC?

[rmteo]

Yes, the library is in SF BASIC. Makes it real easy to extend and/or modify to suit.

[Bruce]

I totally agree, but it's not much use unless you own the compiler. PBP libraries are pure
assembler. You can modify them as needed, learn asembler by understanding them, and
cut/paste sections into your own assembler programs.

And of course PBP supports the whole PIC series unlike Swordfish or C18, which are only
for 18F parts, and very limiting.

Most C compilers have open libraries as well, but it's not anything like the PBP library where
you have the assembly language equivalent of each command. Huge difference.

[lerameur]

I wrote a small program , mostly copied it from one of the post here. it works but the frequency it gives me is 2,2kHz when I program 500hz, I am doing a HPWM: using picF88.
can someone help me?

INCLUDE "modedefs.bas"
@ DEVICE PIC16F88 , HS_OSC , WDT_OFF , PWRT_ON , BOD_ON , LVP_OFF , PROTECT_OFF, CCPMX_OFF
'HS 20mhz, watchdog off, powerup timer on, mclr external, brown out detect on, low volt program off , code protect off
DEFINE OSC 20 'use external 20mhz crystal
PAUSE 100 ' start-up delay
TRISB=0
DEFINE CCP1_REG PORTB
DEFINE CCP1_BIT 3
HPWM 1,127,500
HERE: GOTO HERE
end

[HenrikOlsson]

Hi,
I think you are hitting the bottom of the frequency range for that oscillator speed, try changing to 4Mhz x-tal.

EDIT: Just checked the manual....with a 20Mhz clock the lowest HPWM frequency is stated as 1221Hz for the 14bit core PICs - isn't the F88 a 14bit PIC? Don't know why you'd get 2.2kHz.....

/Henrik.

[lerameur]

yes that is it,
thanks