ソフト S/PDIF トランスミッタ (1)

ハードウェア S/PDIF 送信チップを使わずに、マイコン内蔵の SPI/I2S, DMA モジュールとソフトウェアのみで S/PDIF トランスミッタ (fs = 48 kHz) の機能を実現するプログラムを作りました。
現在のところ、対象のマイコンは Nucleo F401RE/F411RE で、プログラムは STM32CubeMX を利用して作成しています。
DMA に起因する速度低下は 1 % 以下で、簡易的な方法で測ったトランスミッタ・プログラム部分の CPU 負荷率としては約 7 % です。
(2014 年 9 月 4 日追記: プログラムの改良により負荷率が約 9 % から約 7 % になりました）
S/PDIF の受信側で正しく受信されるためには正確なクロックが必要なので、HSE (High Speed External) クロック源として、8 MHz の水晶振動子を実装するか、あるいは ST-LINK 側の MCO 8 MHz 出力を有効にするハードウェア設定が必要です。(基板のリビジョンが C-02 の場合は無改造で使えます)
具体的には、ST-LINK 側の MCO 8 MHz 出力を利用する場合には (基板のリビジョンが C-01 の場合)

• SB16、SB50 のソルダー・ブリッジを「ON」にする

基板のリビジョンが C-02 の場合には、すでに上の設定になっています。
また、8 MHz 水晶振動子を実装する場合には

• X3 に 8 MHz 水晶振動子を実装
• R35, R37 に 0 Ω 抵抗 (ジャンパ線) を実装
• C33, C34 に 20 pF コンデンサを実装

する必要があります。
Nucleo F401RE/F411RE 上のプログラムでは、DDA (Digital Differential Analyzer) アルゴリズムで左右チャネル間で 90 ° 位相の異なる約 440 Hz の正弦波を発生し続けるので、ハードウェア回路としては、光送信モジュールとの間の配線だけです。

「morpho」コネクタの CN10 29 番ピン (Arduino コネクタでは「D4」) と光送信モジュールのデータ入力を接続します。
光送信モジュールがなくても、実験的なレベルでは、チップ LED のような「レンズ」がなくて光が放射される面が「平面」になっている赤色 LED を「D4」ピンに接続して光らせ、光ファイバーを LED に押し当てて、「試してみる」程度のことはできます。
必要なのは SPI/I2S のデータ出力だけですが、一応 I2S モジュールで LRCK、BCLK を出力するような設定にしてあるので、Arduino コネクタの「A2」ピンからは LRCK の 192 kHz、「D3」ピンからは BCLK の 6.144 MHz が出力されています。
(2014 年 9 月 4 日追記: プログラム変更により LRCK 周波数が 96 kHz から 192 kHz になりました）
最後に、ソースリストの掲載は後に回して、今回は HEX ファイルを掲載します。 (プログラム・サイズは約 9 K バイト)
(2014 年 9 月 7 日追記: F401RE/F411RE 両用のプログラムに差し替えました）
下の内容を「ST-LINK Utility」などで Nucleo F401RE/F411RE に書き込めば動作します。 (基板のリビジョンが C-01 の場合には前述の外部 8 MHz クロック対応が必要です)

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