From nobody Sun Dec 08 04:12:29 2024 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 4Y5WnL3bV2z5g22N for ; Sun, 08 Dec 2024 04:13:10 +0000 (UTC) (envelope-from furaisanjin@gmail.com) Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "WR4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Y5WnL1C6mz3xCj for ; Sun, 8 Dec 2024 04:13:10 +0000 (UTC) (envelope-from furaisanjin@gmail.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-ej1-x62f.google.com with SMTP id a640c23a62f3a-aa1e6ecd353so528081866b.1 for ; Sat, 07 Dec 2024 20:13:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1733631188; x=1734235988; darn=freebsd.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=BEKou0MEFx7pbJGBgKv8XXdWHQSw88paX5Szmt2jDGU=; b=JownywFWG7QVPya7kEi/nn36gcH3cwO2YcFPFpdLZ6+DyNDXbmOvAbZVe2I4ViY4Qt 9gi1xxU+6Vg3ywmL+S9UL+Xb7b1PY4TjxkTmp/wUZsfNQYGI0vSq40kAPRSKlgW0sUMe udTeh9AND066BXfH4QcbXehU0vUPyg3BcbTohR1Sdjc8HsUTKgp7U3vr6xDVQo2RAB1B lnP5Gql8yp+0Mxy73rhy2I3AwV/9QotW9r23hASWcsLz3laQzHUfFscuAoZnxuNht8o7 JHi9hVuTAmYGWpV+Hf2LnHqURczc1UbVt2/q6Mck0J/r4kXKLBbhK/iFa/JWUf8X3MJa FffA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733631188; x=1734235988; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=BEKou0MEFx7pbJGBgKv8XXdWHQSw88paX5Szmt2jDGU=; b=i5/VzAjHNNI5CLxyzvDEMwDOlMevJV3/ccQdJZ+K6dqo2ytpJXWiWP/gCCbarxUk4U zmkIjpwh4ZDG4DeeWwhERavXrtHaeLlbNG7209wDVP/8wh5wdRnXhfvqQ+qjMFoQz40p PPkWa6CkV8vBDLBtDgMt9RalH84CarT0JGLc8hMI/LrTK06/MSwLlB9AO4/WsRut6KAu 4X8DFcBXyHsis72ntDFyWnTwrj9Xbg1tPkB6iEGwz0NyPA6EUdQ3kxxA6NxiIjO/pJC9 5V1qzMbUt9nfF+3+o1WYYcnXjrdiaD60Rh7pLh5dL6jgaHwJaxDzvVLDyaahjCfcjrGu dblg== X-Gm-Message-State: AOJu0YztXwJz+lm9fAo+ivUv4/EccEBigqerkTs9Ko/6pzPYSqfV5vCC mRp/YVbiFpMcU9BcT7dPbOqjNmJ9S1HwZc/jc1w3dTKkEFrwVQtnpWtGFR5cSZrVjU7XCu76uGr LDRI8xM5ZqI74HKBkjrz9QxdBNBlzuvdAAgQ= X-Gm-Gg: ASbGncvpl6WR+xjaakNr8CfC5CXR+TSQlewQ7RMp7k2vfv/AqA1j38j3cgFb3BvsfoT lpM47fbvXtJVRvSo/bcFWrijsZxAfK8K6 X-Google-Smtp-Source: AGHT+IEZ7q1A6SttLCdYhFTG2Tjk8qQf72EJQEVHUalrpka+Nlz5KKjba/XCPk8KHTkNhTKCitN8F+1/+kTVkLLnuRE= X-Received: by 2002:a05:6402:1913:b0:5d1:1064:326a with SMTP id 4fb4d7f45d1cf-5d3be69a19amr20494518a12.15.1733631187374; Sat, 07 Dec 2024 20:13:07 -0800 (PST) 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 References: <431FB386-F515-4D77-A855-18055A48E432@dons.net.au> In-Reply-To: From: =?UTF-8?B?6aKo5L6G5pWj5Lq6?= Date: Sun, 8 Dec 2024 13:12:29 +0900 Message-ID: Subject: Re: DS1307 on rpi4B To: "Daniel O'Connor" Cc: FreeBSD ARM List Content-Type: multipart/alternative; boundary="0000000000001859970628ba775e" X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US] X-Rspamd-Queue-Id: 4Y5WnL1C6mz3xCj X-Spamd-Bar: ---- --0000000000001859970628ba775e Content-Type: text/plain; charset="UTF-8" Hello. I'm using this module ( https://www.electronicwings.com/sensors-modules/real-time-clock-rtc-ds1307-module) and there are R2 and R3 for pull-up on the module. The registers are connected to 5V. This probably harms RPI4B because the voltage is 3.3V at RPI4B side. So I removed R2 and R3. That's why internal pull-up is required. Best regards, furaisanjin --0000000000001859970628ba775e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello.

I= 9;m using this module (https://www.electronicwings.com/s= ensors-modules/real-time-clock-rtc-ds1307-module) and there are R2 and = R3 for pull-up on the module. The registers are connected to 5V. This proba= bly harms RPI4B because the voltage is 3.3V at RPI4B side. So I removed R2 = and R3. That's why internal pull-up is required.

Best regards,
furaisanjin

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