Date: Tue, 24 Jan 2023 10:35:56 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-arm@freebsd.org Subject: Re: GPIO inputs on Pis? Message-ID: <a9b00748-1a11-3806-1103-ac2e6ad6bf43@denninger.net> In-Reply-To: <01070185e46b1a6e-ee34b885-1215-45c7-ac18-83320c02cac2-000000@eu-central-1.amazonses.com> References: <0b235f83-7cb3-1d14-7c64-aee7c1c0c23d@denninger.net> <01070185e46b1a6e-ee34b885-1215-45c7-ac18-83320c02cac2-000000@eu-central-1.amazonses.com>
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This is a cryptographically signed message in MIME format. --------------ms020801080202010702090908 Content-Type: multipart/alternative; boundary="------------8LhnITfTu7p3ng0t8nbhzlM5" --------------8LhnITfTu7p3ng0t8nbhzlM5 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Thank you -- will check it out. On 1/24/2023 10:35, Dr. Rolf Jansen wrote: >> Am 23.01.2023 um 11:41 schrieb Karl Denninger <karl@denninger.net>: >> >> 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 >> > See > > https://forums.freebsd.org/threads/gpio-api-general-orange-pi-h3.83950/post-556728 > > And the messages in that thread that follow the one linked above. > > There is a respective thread on this mailing list as well: > > Porting FreeBSD to ARM processors: User Space GPIO Interrupt > programming - GSoC-2018 > <https://lists.freebsd.org/archives/freebsd-arm/2020-November/022740.html>; -- Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------8LhnITfTu7p3ng0t8nbhzlM5 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <p>Thank you -- will check it out.<br> </p> <div class="moz-cite-prefix">On 1/24/2023 10:35, Dr. Rolf Jansen wrote:<br> </div> <blockquote type="cite" cite="mid:01070185e46b1a6e-ee34b885-1215-45c7-ac18-83320c02cac2-000000@eu-central-1.amazonses.com"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <div> <blockquote type="cite" class=""> <div class="">Am 23.01.2023 um 11:41 schrieb Karl Denninger <<a href="mailto:karl@denninger.net" class="moz-txt-link-freetext" moz-do-not-send="true">karl@denninger.net</a>>:</div> <br class="Apple-interchange-newline"> <div class=""> <meta http-equiv="content-type" content="text/html; charset=UTF-8" class=""> <div class=""> <p class="">Is there support somewhere in the 13.x for other than "read current state" / "set current state"?</p> <p class="">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.</p> <p class="">I see apparent review code at <a class="moz-txt-link-freetext" href="https://reviews.freebsd.org/D27398" moz-do-not-send="true">https://reviews.freebsd.org/D27398</a>; from late 2020, but nothing else I can find digging around; an example (assuming it is actually implemented and works) would be helpful</p> </div> </div> </blockquote> </div> See <div class=""><br class=""> </div> <div class=""><a href="https://forums.freebsd.org/threads/gpio-api-general-orange-pi-h3.83950/post-556728" class="moz-txt-link-freetext" moz-do-not-send="true">https://forums.freebsd.org/threads/gpio-api-general-orange-pi-h3.83950/post-556728</a></div>; <div class=""><br class=""> </div> <div class="">And the messages in that thread that follow the one linked above.</div> <div class=""><br class=""> </div> <div class="">There is a respective thread on this mailing list as well:</div> <div class=""><br class=""> </div> <div class=""><a href="https://lists.freebsd.org/archives/freebsd-arm/2020-November/022740.html" class="" moz-do-not-send="true">Porting FreeBSD to ARM processors: User Space GPIO Interrupt programming - GSoC-2018</a></div> </blockquote> <div class="moz-signature">-- <br> Karl Denninger<br> <a href="mailto:karl@denninger.net" class="moz-txt-link-freetext">karl@denninger.net</a><br> <i>The Market Ticker</i><br> <font size="-2"><i>[S/MIME encrypted email preferred]</i></font></div> </body> </html> --------------8LhnITfTu7p3ng0t8nbhzlM5-- --------------ms020801080202010702090908 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DbowggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL 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