From: "Forrest Christian (List Account)" <lists@packetflux.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sender: "piclist-bounces@mit.edu" <piclist-bounces@mit.edu>
Date: Mon, 20 Jul 2020 02:39:02 -0700
Subject: Re: [PIC] MPLAB-X won't set PWM frequency above 25Hz
Thread-Topic: [PIC] MPLAB-X won't set PWM frequency above 25Hz
Thread-Index: AdZeevALyH8BJwwpQ+Gj519vO45llQ==
Message-ID:
 <CAKsZx=32907X9HvLAtunEG44akAV4yDZt8kN3ENS_hNwSVVoUQ@mail.gmail.com>
References:
 <CAL271=1YJC8BA6Wn8JR+NYE1EfNn_ZOp9d2d-vReL48WNUZ9qQ@mail.gmail.com>
In-Reply-To:
 <CAL271=1YJC8BA6Wn8JR+NYE1EfNn_ZOp9d2d-vReL48WNUZ9qQ@mail.gmail.com>
Reply-To: Microcontroller discussion list - Public. <piclist@mit.edu>
Accept-Language: en-US
X-MS-Exchange-Organization-SenderIdResult: Pass
X-MS-Exchange-Organization-PRD: mit.edu
X-MS-TNEF-Correlator:
received-spf: Pass (protection.outlook.com: domain of packetflux.com
	designates 209.85.208.174 as permitted sender)
	receiver=protection.outlook.com; client-ip=209.85.208.174;
	helo=mail-lj1-f174.google.com;
dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=packetflux-com.20150623.gappssmtp.com; s=20150623;
	h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
 	bh=Fmj9IzGF7zxUK3nQvSmcPzn6WMjXsp4H8LrtsMvcfgM=;
	b=S42lAg4gsws7v3GFDaHytbhhU870E+zzvMTnwXtzqLfqFX5b/xTO2xkuVPtZl5YwO1
	ZvT6XzMiw25Um5OSoe9UHleTCjYqLN9gMAXTppSoOg5/hSfCMw1yTjl9GizS1NMxFy1q
	62ZQ8bJ06FS5kDkFO6e0MkQXTAAZdfAl1e1R2sJ/TUBVlqTj2r5PqT3EQn6+clwKcDYL
	leH9SzkqyyCzc29ayZwRZ8gtiRwvgCTwJz0EQgaSboAMMdx7pQ1xyShCWQroiPmfcDnb
	8XOi87Hm1n/Y/idJbnLiw3E5Tt25dIfNmbKk/Sdcy5fpw+wWLfBxOMdp4nTNnQW0LKyg	rJyg==
authentication-results: spf=pass (sender IP is 209.85.208.174)
	smtp.mailfrom=packetflux.com; mit.edu;	dkim=pass (signature was verified)
	header.d=packetflux-com.20150623.gappssmtp.com; mit.edu;	dmarc=bestguesspass
	action=none header.from=packetflux.com;
errors-to: piclist-bounces@mit.edu
list-id: "Microcontroller discussion list - Public." <piclist.mit.edu>
list-post: <mailto:piclist@mit.edu>
x-beenthere: piclist@mit.edu
x-mailman-version: 2.1.6
x-received: by 2002:a2e:99c6:: with SMTP id
 l6mr10999296ljj.220.1595237952447; 	Mon, 20 Jul 2020 02:39:12 -0700 (PDT)
x-topics: [PIC]
x-content-filtered-by: Mailman/MimeDel 2.1.6
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

I'm curious where you're seeing these values, Is this in MCC or something
like that?

So, here are random thoughts:

Is the processor really running at 16Mhz?   Blinking a led with a delay
loop is a good way to verify this.

If you're running at 16Mhz, it seems like if you set the timer prescale to
1, and then set a PR2 value of 0xff you'd get where you want to be.

That is 16Mhz/4 =3D 4Mhz(Fosc/4) / 1 =3D 4Mhz / 256=3D 15.625kHz

On Sun, Jul 19, 2020 at 10:06 PM James Burkart <james@burkartstudios.com>
wrote:

> I'm using MPLAB-X v5.35, and XC-8 v2.20.
>
> Using PIC16F1503. Brand new stand alone project. Set internal frequency t=
o
> 16MHz. TMR2 period set to 250ns. PWM frequency shows 25Hz. Nothing I do i=
s
> setting the PWM frequency correctly. What am I missing here? I'll have to
> dig out my stuff to breadboard it and see what the actual PWM frequency i=
s,
> but this is frustrating.
>
> I'd like to set the timer period to 64 us and get a PWM frequency of 15.6=
25
> kHz.
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>


--=20
- Forrest
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.