From nobody Tue Apr 23 18:19:19 2024 X-Original-To: freebsd-questions@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 4VP9PZ3r0Cz5HnTf for ; Tue, 23 Apr 2024 18:19:30 +0000 (UTC) (envelope-from freebsd-questions@ymmv.dk) Received: from mail01.ymmv.dk (193-106-164-141.ip4.fiberby.net [193.106.164.141]) by mx1.freebsd.org (Postfix) with ESMTP id 4VP9PX5nVJz4Sjc for ; Tue, 23 Apr 2024 18:19:28 +0000 (UTC) (envelope-from freebsd-questions@ymmv.dk) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=ymmv.dk header.s=ymmv-mail-dkim header.b=Sl50ohW0; dmarc=none; spf=none (mx1.freebsd.org: domain of freebsd-questions@ymmv.dk has no SPF policy when checking 193.106.164.141) smtp.mailfrom=freebsd-questions@ymmv.dk Received: from c02qx0.local (193-106-164-140.ip4.fiberby.net [193.106.164.140]) by mail01.ymmv.dk (Postfix) with ESMTPSA id 4386C1265DF for ; Tue, 23 Apr 2024 20:19:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ymmv.dk; s=ymmv-mail-dkim; t=1713896361; bh=myF1sQjVAxGgqVVO+sbwas1beN8z0T1sC4o+vDKv2xk=; h=Date:From:To:Subject:References:In-Reply-To; b=Sl50ohW0GxXEyKUrTIS7dcmiD5VcWUJHDLpHuswUjjlloSDjFCoOlPvx2cnl14Y24 9pnrftcBi0+XMQ18GK+Wo6AIlCw0HpVG8bXsuAigysFbEns98C1bmHCSZWjESf7Mrs dH60l67O0LVhOmX6Mde3ogg/iNW4IstCBnkUs3D1ZwVOd3KHLU/PreKCOLCLTgaycT P4bh7LMqYLfVJKJx5Ae/wpgWGDL65RiVjjHQKopJGYNrN4RE8uFCZH/baEXyhmMcxN LzKsHBYViESmbLQ6nrKtQPUm185tUH1LNt67Jduu225tzu6hJmVJVLadmBMCXfMANR GO2tHVhfdorTg== Date: Tue, 23 Apr 2024 20:19:19 +0200 From: Jon Clausen To: freebsd-questions@freebsd.org Subject: Re: serial, basic stuff Message-ID: References: <86le57ajwa.fsf@ltc.des.dev> <86cyqj9i3z.fsf@ltc.des.dev> <2e4dm4ow35zarex722okmj2wfcsck3pretodmuza63ccpywqov@qhbguzffdkxc> <868r16anpc.fsf@ltc.des.dev> List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-questions@freebsd.org Sender: owner-freebsd-questions@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.60 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; R_DKIM_ALLOW(-0.20)[ymmv.dk:s=ymmv-mail-dkim]; ONCE_RECEIVED(0.10)[]; RCVD_NO_TLS_LAST(0.10)[]; MIME_GOOD(-0.10)[text/plain]; ASN(0.00)[asn:42541, ipnet:193.106.164.0/22, country:DK]; RCPT_COUNT_ONE(0.00)[1]; R_SPF_NA(0.00)[no SPF record]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DMARC_NA(0.00)[ymmv.dk]; MLMMJ_DEST(0.00)[freebsd-questions@freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MISSING_XM_UA(0.00)[]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[ymmv.dk:+] X-Rspamd-Queue-Id: 4VP9PX5nVJz4Sjc On 2024-04-21 15:18:15 (+0200), Jon Clausen wrote: > On 2024-04-21 14:45:51 (+0200), Dag-Erling Smørgrav wrote: > > Jon Clausen writes: > > > So at this point, I should be ready to move on to attempting the setup that > > > I actually want: > > > > > > jh05:cuau1 <-> jh06:ttyu0 > > If it's > > still not working, I would suggest hooking up an oscilloscope to the > > level shifter to check that it's working properly. > Well, the oscilloscope I have is old, and I'm not convinced it even works. > But the level shifter has been working very recently, so I have high > confidence that it still is. ...and sure enough it still is, and I'm an idiot. I've spent much much too long focusing on flags and connection settings, without double checking that the actual basics were alright, because they weren't. I managed to overlook that I hadn't connected the RS232<->TTL adapter to the power supply pin on the board header. Once that was done, everything was fine. So yeah - "basic stuff" indeed. br /jon -- YMMV