From nobody Wed Jan 25 16:45:28 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 4P28pr4gl2z3bswm for ; Wed, 25 Jan 2023 16:45:40 +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 4P28pq6MNBz3CCF for ; Wed, 25 Jan 2023 16:45:39 +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 6C1572110B5 for ; Wed, 25 Jan 2023 11:45:33 -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 B17B0281F67 for ; Wed, 25 Jan 2023 11:45:30 -0500 (EST) Message-ID: <1cd552a7-b015-c935-06fc-9f12e1b37daa@denninger.net> Date: Wed, 25 Jan 2023 11:45:28 -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 Subject: Re: GPIO inputs on Pis? Content-Language: en-US To: freebsd-arm@freebsd.org References: <0b235f83-7cb3-1d14-7c64-aee7c1c0c23d@denninger.net> <01070185e46b1a6e-ee34b885-1215-45c7-ac18-83320c02cac2-000000@eu-central-1.amazonses.com> <01070185e4732fd8-c0bede0b-d9df-4557-a174-cb237fa4bfaf-000000@eu-central-1.amazonses.com> <01070185e534f221-14f362b5-2b96-43f0-b0b0-f496ad9994fe-000000@eu-central-1.amazonses.com> From: Karl Denninger In-Reply-To: <01070185e534f221-14f362b5-2b96-43f0-b0b0-f496ad9994fe-000000@eu-central-1.amazonses.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms090009090809040403030506" 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)[-0.998]; DMARC_POLICY_ALLOW(-0.50)[denninger.net,none]; MIME_GOOD(-0.20)[multipart/signed,multipart/alternative,text/plain]; R_SPF_ALLOW(-0.20)[+mx]; ARC_NA(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)[]; TO_DN_NONE(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] X-Rspamd-Queue-Id: 4P28pq6MNBz3CCF X-Spamd-Bar: ---- X-ThisMailContainsUnwantedMimeParts: N This is a cryptographically signed message in MIME format. --------------ms090009090809040403030506 Content-Type: multipart/alternative; boundary="------------k2FnGkugSJrI0WsNDUAuyMyd" --------------k2FnGkugSJrI0WsNDUAuyMyd Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 1/24/2023 14:15, Dr. Rolf Jansen wrote: > Yes, and for this reason, this GPIO event code which was developed > by Christian Krämer in the course of the GSoC-2018 and has been > submitted in 2020 by Ian Lepore to the freebsd tree is perfect. > > Ian tested it with a 10 MHz sqaure wave on an imx6 (ARMv7, 1GHz) and > got an event every 10 µs. That means the max. speed without event > losses would be 100 kHz. I did not do exact measurements, however, my > impression is that my RPi4B can do it a tad faster than my BeagleBone > Black. With the RPi4, I needed to improve the debouncing of the > encoder and the buttons, because it saw hundreds of bounces which the > BBB didn’t. However, it may also be, that the internal GPIO circuits > of the BBB have a different damping characteristic. > > Anyway for my applications, 100 kHz way faster than what I need. > > On my GitHub repository I placed another example on using the GPIO > events for the RPi: > > https://github.com/cyclaero/shutdd > > See also the respective thread on this mailing list: > > https://lists.freebsd.org/archives/freebsd-arm/2022-July/001576.html So..... just to see  if I'm understanding this correctly (pretty sure I am having read through the test code). Presume I have "X" pins configured as inputs and "Y" configured as outputs.  I use the ioctl calls to set the outputs (which works just fine) and can read current input state (which also works.) If I set /on the same descriptor /(not on the specific pins; it applies to all input pins on that descriptor as it appears there's no pin-specific setting in the configuration flags to enable this on a pin-by-pin basis) the event report config type I want I can then select() on the descriptor with the usual timeouts (or zero for a poll) and get a "ready" (much as one would for any other sort of I/O) and, if I do get a "ready" return on the descriptor a read() on that descriptor will return zero or more structures of the type I said I configured, each of which describes either an individual state change on one of configured input pins that is set up for individual event reporting OR a structure of the summary of changes for a given pin.  I assume given the 16-bit "count" field on the summary return that counts are "since last returned" and not "since boot" or "since descriptor was opened and configuration set." This also presumes that there is some buffer depth on this that, at some point, may be exceeded so if I "go away" for too long I may miss things -- particularly if I need detail-level reporting. Thus it looks like that its possible for most cases (assuming resolution of the time stamps is high enough and the driver timing is accurate enough, plus the code is sparse enough that actually does the reading) to not just read an optical encoder with this but also (if you use detail reporting) to read a bi-phase encoder so you can determine which direction it is moving. On to check it out; if I missed something here a "heh idiot, no it actually works like this!" would be appreciated :-) -- Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------k2FnGkugSJrI0WsNDUAuyMyd Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
On 1/24/2023 14:15, Dr. Rolf Jansen wrote:
Yes, and for this reason, this GPIO event code which was developed by Christian Krämer in the course of the GSoC-2018 and has been submitted in 2020 by Ian Lepore to the freebsd tree is perfect.

Ian tested it with a 10 MHz sqaure wave on an imx6 (ARMv7, 1GHz) and got an event every 10 µs. That means the max. speed without event losses would be 100 kHz. I did not do exact measurements, however, my impression is that my RPi4B can do it a tad faster than my BeagleBone Black. With the RPi4, I needed to improve the debouncing of the encoder and the buttons, because it saw hundreds of bounces which the BBB didn’t. However, it may also be, that the internal GPIO circuits of the BBB have a different damping characteristic.

Anyway for my applications, 100 kHz way faster than what I need.

On my GitHub repository I placed another example on using the GPIO events for the RPi:


See also the respective thread on this mailing list:

So..... just to see  if I'm understanding this correctly (pretty sure I am having read through the test code).

Presume I have "X" pins configured as inputs and "Y" configured as outputs.  I use the ioctl calls to set the outputs (which works just fine) and can read current input state (which also works.)

If I set on the same descriptor (not on the specific pins; it applies to all input pins on that descriptor as it appears there's no pin-specific setting in the configuration flags to enable this on a pin-by-pin basis) the event report config type I want I can then select() on the descriptor with the usual timeouts (or zero for a poll) and get a "ready" (much as one would for any other sort of I/O) and, if I do get a "ready" return on the descriptor a read() on that descriptor will return zero or more structures of the type I said I configured, each of which describes either an individual state change on one of configured input pins that is set up for individual event reporting OR a structure of the summary of changes for a given pin.  I assume given the 16-bit "count" field on the summary return that counts are "since last returned" and not "since boot" or "since descriptor was opened and configuration set."

This also presumes that there is some buffer depth on this that, at some point, may be exceeded so if I "go away" for too long I may miss things -- particularly if I need detail-level reporting.

Thus it looks like that its possible for most cases (assuming resolution of the time stamps is high enough and the driver timing is accurate enough, plus the code is sparse enough that actually does the reading) to not just read an optical encoder with this but also (if you use detail reporting) to read a bi-phase encoder so you can determine which direction it is moving.

On to check it out; if I missed something here a "heh idiot, no it actually works like this!" would be appreciated :-)

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