From nobody Tue Jun 8 21:06:56 2021 X-Original-To: freebsd-arm@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 0CF195D7F92 for ; Tue, 8 Jun 2021 21:08:15 +0000 (UTC) (envelope-from mgrooms@shrew.net) Received: from mx1.shrew.net (mx1.shrew.net [38.97.5.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4G02rs4K20z4nnl for ; Tue, 8 Jun 2021 21:08:13 +0000 (UTC) (envelope-from mgrooms@shrew.net) Received: from mail.shrew.net (mail.shrew.prv [10.24.10.20]) by mx1.shrew.net (8.15.2/8.15.2) with ESMTP id 158L86Xi099694 for ; Tue, 8 Jun 2021 16:08:06 -0500 (CDT) (envelope-from mgrooms@shrew.net) Received: from [10.16.32.30] (65-36-5-114.static.grandenetworks.net [65.36.5.114]) by mail.shrew.net (Postfix) with ESMTPSA id EF3FB19A11C for ; Tue, 8 Jun 2021 16:08:00 -0500 (CDT) To: freebsd-arm@freebsd.org From: Matthew Grooms Subject: RPI4 Hardware PWM Message-ID: <9bb7f3d1-8256-be26-ba87-90946ce1b95f@shrew.net> Date: Tue, 8 Jun 2021 16:06:56 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 List-Id: Porting FreeBSD to ARM processors List-Archive: https://lists.freebsd.org/archives/freebsd-arm List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-arm@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.shrew.net [10.24.10.10]); Tue, 08 Jun 2021 16:08:06 -0500 (CDT) X-Rspamd-Queue-Id: 4G02rs4K20z4nnl X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of mgrooms@shrew.net designates 38.97.5.131 as permitted sender) smtp.mailfrom=mgrooms@shrew.net X-Spamd-Result: default: False [-3.30 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; RBL_DBL_DONT_QUERY_IPS(0.00)[38.97.5.131:from]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-arm@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[38.97.5.131:from:127.0.2.255]; RCVD_COUNT_THREE(0.00)[3]; DMARC_NA(0.00)[shrew.net]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.998]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:174, ipnet:38.0.0.0/8, country:US]; RCVD_TLS_LAST(0.00)[]; MAILMAN_DEST(0.00)[freebsd-arm] X-ThisMailContainsUnwantedMimeParts: N Hey All, I have a project I'm working on that depends on interfacing with a few sensor modules using both i2c and PWM. I've got the i2c devices to work correctly, but I'm not sure how to interface with the HW PWM support of the RPI4. I can see there are settings exposed via sysctl for Beaglebone systems ... https://zewaren.net/bbb-pwm.html I was hoping I'd be able to force GPIO 12 or 13 into ALT0  and set the duty values via sysctl, but that doesn't seem to be an option. Any help would be greatly appreciated. Thanks, -Matthew