Date: Wed, 28 Apr 2021 22:07:57 +0100 From: Mark Murray <markm@FreeBSD.org> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: Mark Millard <marklmi@yahoo.com>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: I2C/IIC working on RPI4 8GB? Message-ID: <ED9ABBBE-9B5A-4B51-806C-F91AABE39731@FreeBSD.org> In-Reply-To: <20210428101945.67417ef8eba251dcbcb38078@bidouilliste.com> References: <1C2DD11C-B1F6-4C2A-9AB0-5F1553520FF5@FreeBSD.org> <20210426161138.a8f44b6e1134f73a411be57d@bidouilliste.com> <CF4C4332-BB2F-47E9-B879-8EEA0E53E848@FreeBSD.org> <C4828BF2-E8B7-45D1-B0F8-5E72AF84D565@yahoo.com> <47A634E3-4938-4AFC-9341-E480CEBF67FB@FreeBSD.org> <20210428101945.67417ef8eba251dcbcb38078@bidouilliste.com>
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--Apple-Mail=_04880BD6-B6E5-4FD5-80AB-70DAE57ECE5A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 28 Apr 2021, at 09:19, Emmanuel Vadot <manu@bidouilliste.com> wrote: >=20 > On Wed, 28 Apr 2021 09:01:56 +0100 > Mark Murray <markm@FreeBSD.org <mailto:markm@FreeBSD.org>> wrote: >>=20 >> I took apart the i2c1.dtbo overlay that mentions pins 2, 3, and = swapped them, and reassembled the overlay. >=20 > This suggestion is to use i2c over gpio via iicbb, not the i2c > controller in the SoC. Er, right :-). I'll consider that approach if I can't get the BSC to = work > According to this document is this just to detect that the slave hold > the scl line too long so I don't think that this is the problem here. > If you have a scope or a logic analyzer I suggest you start by using > it to confirm that when you scan with i2c -s you see something. As it turns out, my logic analyser arrived today. This is a perfect project for it :-) Thanks! M -- Mark R V Murray --Apple-Mail=_04880BD6-B6E5-4FD5-80AB-70DAE57ECE5A Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 Comment: GPGTools - http://gpgtools.org iQEzBAEBCgAdFiEEyzPHvybPbOpU9MCxQlsJDh9CUqAFAmCJzq0ACgkQQlsJDh9C UqDjlwf9E1uHcGOiqCw0FtPqmu/iRNVFnbY/cP84TRMrYm++e0+io8H8NtGu7Usz QlwpjYU1ZmE0ZptVeZCbhdv5eVfHmvDuLBNGjrP6tzq5U0tUSDeHS9+BUZMv8oqP Fx7x2rC9OM/JIHQeRTusLu7h8CvG3XtCXJwF6aoSGv7SSV7piejXBgt938wA+9xk k1gFxEBCrqipW5kXHO49oVeDRdshMsYWO4SFWmuxJhWZYsByvrZaH62pfBRO6/MP 8Z81dw1wzGrFt3jC2KeeCcki9HMxb2rQbqAp8R4c3O6t8JC0xAs9ZsGhIBXzMI5v 11FbP0Mqay8xljZc4StPHltPdDY55w== =DTOk -----END PGP SIGNATURE----- --Apple-Mail=_04880BD6-B6E5-4FD5-80AB-70DAE57ECE5A--
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