From nobody Fri Oct 22 06:52:07 2021 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 0E4891807F1B for ; Fri, 22 Oct 2021 06:52:34 +0000 (UTC) (envelope-from Olivier.Nicole@cs.ait.ac.th) Received: from mail.cs.ait.ac.th (mail.cs.ait.ac.th [192.41.170.16]) (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 4HbFQl68JVz3Cm6 for ; Fri, 22 Oct 2021 06:52:31 +0000 (UTC) (envelope-from Olivier.Nicole@cs.ait.ac.th) Received: from mail.cs.ait.ac.th (localhost [127.0.0.1]) by mail.cs.ait.ac.th (Postfix) with ESMTP id E7141112502 for ; Fri, 22 Oct 2021 13:52:21 +0700 (+07) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cs.ait.ac.th; h= content-type:content-type:mime-version:message-id:date:date :subject:subject:from:from:received:received:received; s= selector1; t=1634885541; x=1636699942; bh=dcnJuLmYA0Ha1wqA4bXHjA a84wY1KrHA4X4n5kKuQH8=; b=Rzwu/hqOXN3kdUIE9+QsTTh2XZD6AgwkpIl27C KHtt7Tt9tVXx6goKhpLNc0weaBPnnjEtjaslnUPNbAce/zhSOZRPOsmPjnv3a0i2 WHTifqO1G7AezVqEZnuB/sH93NxX1CSouFS/GPrzEFSQfOF6Uu3bi6jk23FyE3bD LqQGw= X-Virus-Scanned: amavisd-new at cs.ait.ac.th Received: from mail.cs.ait.ac.th ([127.0.0.1]) by mail.cs.ait.ac.th (mail.cs.ait.ac.th [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 2S2HBuEAWwyM for ; Fri, 22 Oct 2021 13:52:21 +0700 (+07) Received: from banyan.cs.ait.ac.th (banyan.cs.ait.ac.th [192.41.170.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.cs.ait.ac.th (Postfix) with ESMTPS id EBE3A112501 for ; Fri, 22 Oct 2021 13:52:20 +0700 (+07) Received: (from on@localhost) by banyan.cs.ait.ac.th (8.15.2/8.15.2/Submit) id 19M6q8Ns059498; Fri, 22 Oct 2021 13:52:08 +0700 (ICT) (envelope-from on@banyan.cs.ait.ac.th) From: Olivier To: freebsd-arm@freebsd.org Subject: Using 20x4 LCD display Date: Fri, 22 Oct 2021 13:52:07 +0700 Message-ID: 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 Content-Type: text/plain X-Rspamd-Queue-Id: 4HbFQl68JVz3Cm6 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=cs.ait.ac.th header.s=selector1 header.b="Rzwu/hqO"; dmarc=pass (policy=none) header.from=cs.ait.ac.th; spf=pass (mx1.freebsd.org: domain of Olivier.Nicole@cs.ait.ac.th designates 192.41.170.16 as permitted sender) smtp.mailfrom=Olivier.Nicole@cs.ait.ac.th X-Spamd-Result: default: False [-4.70 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[cs.ait.ac.th:s=selector1]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-arm@freebsd.org]; TO_DN_NONE(0.00)[]; RCVD_DKIM_ARC_DNSWL_MED(-0.50)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCVD_COUNT_THREE(0.00)[4]; MID_RHS_MATCH_FROMTLD(0.00)[]; RCVD_IN_DNSWL_MED(-0.20)[192.41.170.16:from]; DKIM_TRACE(0.00)[cs.ait.ac.th:+]; DMARC_POLICY_ALLOW(-0.50)[cs.ait.ac.th,none]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:4767, ipnet:192.41.170.0/24, country:TH] X-ThisMailContainsUnwantedMimeParts: N Hello, I would like to use a 20x4 LCD display attached to a Raspberry Pi running FreeBSd 12.2. I can talk to the display through the I2C interface, when I send something the back light will turn off and on, so the link is established. What I cannot find is the sequence of codes to send in order to write a character on te screen, to move the cursor around, etc. All documentation I could find so far relate to Raspbian or Arduino and are always using high level libraries (I could not find such on FreeBSD, equivalent to WiringPi). Whatever random characters I send to the screen, it persistently shows alternating empty lines and lines or black boxes. Any help pointing me in the right direction will be greatly appreciated. TIA, Olivier --