From nobody Mon Jan 23 14:41:45 2023 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 4P0t8y5qF3z2tx7P for ; Mon, 23 Jan 2023 14:41:54 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [104.236.120.189]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4P0t8y0672z3mb3 for ; Mon, 23 Jan 2023 14:41:54 +0000 (UTC) (envelope-from karl@denninger.net) Authentication-Results: mx1.freebsd.org; dkim=none; spf=pass (mx1.freebsd.org: domain of karl@denninger.net designates 104.236.120.189 as permitted sender) smtp.mailfrom=karl@denninger.net; dmarc=pass (policy=none) header.from=denninger.net Received: from denninger.net (097-081-026-048.res.spectrum.com [97.81.26.48]) by colo1.denninger.net (Postfix) with ESMTP id 9AE29211083 for ; Mon, 23 Jan 2023 09:41:47 -0500 (EST) Received: from [192.168.10.25] (D15.Denninger.Net [192.168.10.25]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id 328421D5168 for ; Mon, 23 Jan 2023 09:41:47 -0500 (EST) Message-ID: <0b235f83-7cb3-1d14-7c64-aee7c1c0c23d@denninger.net> Date: Mon, 23 Jan 2023 09:41:45 -0500 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 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Content-Language: en-US To: "freebsd-arm@freebsd.org" From: Karl Denninger Subject: GPIO inputs on Pis? Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms000601070800060604040601" X-Spamd-Result: default: False [-4.90 / 15.00]; SIGNED_SMIME(-2.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.999]; DMARC_POLICY_ALLOW(-0.50)[denninger.net,none]; MIME_GOOD(-0.20)[multipart/signed,multipart/alternative,text/plain]; R_SPF_ALLOW(-0.20)[+mx]; TO_DN_EQ_ADDR_ALL(0.00)[]; ASN(0.00)[asn:14061, ipnet:104.236.64.0/18, country:US]; MLMMJ_DEST(0.00)[freebsd-arm@freebsd.org]; R_DKIM_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; RCVD_TLS_LAST(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; FROM_HAS_DN(0.00)[]; FREEFALL_USER(0.00)[karl]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~,4:~]; TO_MATCH_ENVRCPT_ALL(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-arm@freebsd.org]; HAS_ATTACHMENT(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] X-Rspamd-Queue-Id: 4P0t8y0672z3mb3 X-Spamd-Bar: ---- X-ThisMailContainsUnwantedMimeParts: N This is a cryptographically signed message in MIME format. --------------ms000601070800060604040601 Content-Type: multipart/alternative; boundary="------------x2pMdr7LsuFFqjpJMaYDHEJj" --------------x2pMdr7LsuFFqjpJMaYDHEJj Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Is there support somewhere in the 13.x for other than "read current state" / "set current state"? Specifically, there is evidence in the sys/gpio.h header file that I can open up a file descriptor and then use select()/read() to grab the contents of a ring buffer of some size (presumably interrupt-posted) of events since last look, and determine if there's anything in there.  Provided you're reasonably fast this might be enough to, for example, read an optical encoder that has a modest pulse rate. I see apparent review code at https://reviews.freebsd.org/D27398 from late 2020, but nothing else I can find digging around; an example (assuming it is actually implemented and works) would be helpful. Thanks in advance! -- Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------x2pMdr7LsuFFqjpJMaYDHEJj Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Is there support somewhere in the 13.x for other than "read current state" / "set current state"?

Specifically, there is evidence in the sys/gpio.h header file that I can open up a file descriptor and then use select()/read() to grab the contents of a ring buffer of some size (presumably interrupt-posted) of events since last look, and determine if there's anything in there.  Provided you're reasonably fast this might be enough to, for example, read an optical encoder that has a modest pulse rate.

I see apparent review code at https://reviews.freebsd.org/D27398 from late 2020, but nothing else I can find digging around; an example (assuming it is actually implemented and works) would be helpful.

Thanks in advance!

--
Karl Denninger
karl@denninger.net
The Market Ticker
[S/MIME encrypted email preferred]
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