From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FROM autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 3393 invoked from network); 25 Apr 2021 17:57:39 -0000 Received: from 1ess.inri.net (216.126.196.35) by inbox.vuxu.org with ESMTPUTF8; 25 Apr 2021 17:57:39 -0000 Received: from mail-vs1-f46.google.com ([209.85.217.46]) by 1ess; Sun Apr 25 13:27:35 -0400 2021 Received: by mail-vs1-f46.google.com with SMTP id w24so3176412vsq.5 for <9front@9front.org>; Sun, 25 Apr 2021 10:27:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=Q543G+WK6C6aZb0wHsKNr30MOq4VtDQCwzHExJC7EPk=; b=cNbNdIbO5/scUHFX7rlJUycK1fU3QHMdYNoO4VVi3Xsh9Ow/8sDWbWeqxdUvHgJ1Ay aY91SYjsh83srCMw21SpnpuLNgMboChfDSfr6ZkFqr3kYl4OmtNmSjOI8qxUiO58UElX 2GjExbqfxf4H3pXPAZOo3W9kuhH65G3XW3KsSwUmPMgiLwRdop1N3cyFrvix5chCbFIR Qm+cT+lJrORHh+MRQo2BwJjzRitQpjPtWRzbJRsmxSSciyARtFj2ei+ZYAvq2zQfOOte 8yVcUk4ZqPNIyJ1t5qWM2dNO1W5QR2kvwoYaGX36ahAKS+KrjQW1uMhFSJWAznvJXS05 rNpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=Q543G+WK6C6aZb0wHsKNr30MOq4VtDQCwzHExJC7EPk=; b=nrVeoSd53sW8xMaWze+ZAbvqzfd4ep4CfYdrY0Gf3w6Rx/Ly+Al4MkP7Q6BC550UXz 3nRNhWrMGiYi4zYzlU3EYlzhUamWs/n02Buvz312xqlsVlJ4nhQwBWXyflKlVIG1poAz VYEl8PaJ2iJ6I7Sf6DBkdyCA6sevlEEI2zfMqrz6lmu0gijI5p7oBrmtfkRJ7HJ7En4l Zuc9IdFKoGsi5KupzIDU7e9HXnFnmt3Dg1dmf3T129eOe1sA8aYGRMtH8cXTYRY8VO94 PnYto1h+OgIaKo1TTaOe6ddFX8cJyPs7BhTHM4XrX/QBllkYQ9rNrxVnBmmz7cEHLcb4 v6LA== X-Gm-Message-State: AOAM5312UcqLl9x6067yNpDeALIzQBt3lgtKVTphImcjMVKCoG+XiA6Q rKvV94ZbGvpzC5UN2g75gRzevAcgLk/s+GriSBjNbFy0 X-Google-Smtp-Source: ABdhPJwseI4oPpC0CFq4MBJuEkKVpvkhVpsFIcT9M2vt//d99x20B1pjTQAFURlJWkxngnBlMg7gRyrYkRDVuU4IrPo= X-Received: by 2002:aa7:9dcc:0:b029:275:ad72:75ba with SMTP id g12-20020aa79dcc0000b0290275ad7275bamr2677809pfq.18.1619371202223; Sun, 25 Apr 2021 10:20:02 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a05:6a20:a01e:b029:1b:3549:26b7 with HTTP; Sun, 25 Apr 2021 10:20:01 -0700 (PDT) In-Reply-To: <0C73F8031AC040C9C98E26332A9A4D2B@felloff.net> References: <0C73F8031AC040C9C98E26332A9A4D2B@felloff.net> From: hiro <23hiro@gmail.com> Date: Sun, 25 Apr 2021 19:20:01 +0200 Message-ID: To: 9front@9front.org Content-Type: text/plain; charset="UTF-8" List-ID: <9front.9front.org> List-Help: X-Glyph: ➈ X-Bullshit: WEB2.0 over YAML service wrapper-oriented rich-client-based app Subject: Re: [9front] Getting Started with Kernel Development? Reply-To: 9front@9front.org Precedence: bulk here's a fitting solution https://de.aliexpress.com/item/1005002220730177.html i picked this one because it doesn't have a case, just like the rpi. of course the ones with case are a little cheaper, but this way you can say you built it yourself On 4/25/21, cinap_lenrek@felloff.net wrote: >> I've also got the "BCM2835 ARM Peripherals" spec, which specifies how >> to interact with the chip's I2S audio interface. > > As far as i know, the stock raspberry pi is not using I2S. > > There are some people that have build their own soundcards > for the pi with a I2S DAC but it is not standard. > > Instead, they hacked together some filter circuit and connected > it to a GPIO pin. > > (This pattern is a logical continuation on raspberry pi hardware > design philosphy, where using the existing dedicated peripherals > for their intended purpose must be rejected and standards must be > ignored: cpu -> GPU, ethernet -> USB, audio -> GPIO, wifi -> SDCARD, > usb -> ?????WHATISTHIS????, usbc -> ?????, PXE -> ???????). > > The GPU has firmware code to drive that GPIO pin and also send > audio over HDMI, but todo that you have to talk to the videocore > firmware thru a complicated software media streaming interface. > > Afik, it is possible to drive the gpio pin from the cpu somehow > but quality will be garbage and waste alot of power. > > -- > cinap >