Date: Thu, 3 Mar 2016 19:57:20 +0100 From: =?utf-8?Q?Peter_Ankerst=C3=A5l?= <peter@pean.org> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: PPS input on a generic GPIO pin on Raspberry Pi. Message-ID: <8C90C80B-AC5F-4B12-8E84-84193B8C55C4@pean.org>
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--Apple-Mail=_0D8517FC-ED96-4154-9223-FE29AE8A1724 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi! I have sort of exactly the same question as Erik: = http://lists.freebsd.org/pipermail/freebsd-questions/2014-July/259055.html= I have bought a https://learn.adafruit.com/adafruit-ultimate-gps and = want to use the PPS output to discipline my clock. But the only source of information on how PPS works in FreeBSD I could = find is this: = https://docs.freebsd.org/doc/8.0-RELEASE/usr/share/doc/ntp/pps.html and = it clearly states the two ways to provide a PPS signal. "The PPS signal = can be connected in either of two ways: via the data carrier detector = (DCD) pin of a serial port or via the acknowledge (ACK) pin of a = parallel port=E2=80=9D Since the Pi doesn=E2=80=99t have any DCD pin i would like to use a = generic GPIO for this. There is a linux kernel module for this: = http://lxr.free-electrons.com/source/drivers/pps/clients/pps-gpio.c?v=3D3.= 6= --Apple-Mail=_0D8517FC-ED96-4154-9223-FE29AE8A1724 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIL0TCCBeIw ggPKoAMCAQICEGunin0K14jWUQr5WeTntOEwDQYJKoZIhvcNAQELBQAwfTELMAkGA1UEBhMCSUwx FjAUBgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmlj YXRlIFNpZ25pbmcxKTAnBgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4X DTE1MTIxNjAxMDAwNVoXDTMwMTIxNjAxMDAwNVowdTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKTAnBgNVBAsTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MSMw IQYDVQQDExpTdGFydENvbSBDbGFzcyAxIENsaWVudCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEP ADCCAQoCggEBAL192vfDon2D9luC/dtbX64eG3XAtRmvmCSsu1d52DXsCR58zJQbCtB2/A5uFqNx 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