February 2015
Intermediate to advanced
200 pages
4h 48m
Japanese
Content preview from Bluetooth Low Energyをはじめよう
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028
Bluetooth Low Energyをはじめよう
ホスト・コントローラー・インタフェース（
HCI
）
1 章で説明したように、Bluetooth規格では数種類のチップ構成が可能であり、ホスト・
コ ン ト ロ ー ラ ー ・ イ ン タ フ ェ ー ス（ HCI）は シ リ ア ル イ ン タ フ ェ ー ス 上 で ホ ス ト と コ ン ト ロ ー ラ ー
間の通信を行うための標準プロトコルだ。この章ですでに述べたように、コントローラーは
物理層と接触し厳密なリアルタイム要件を持つ唯一のモジュールなので、このレベルで線
を引くことには意味がある。つまり、より複雑だが時間的要求が厳しくない、高度なCPU
向きのプロトコルスタックを実装するホストから、コントローラーを分離することが実用的な
場合が多いのだ。
この構成の典型的な例としては、大部分のスマートフォンやタブレット、そしてパーソナ
ルコンピュータが 挙 げられる。これらのホスト（ および アプリケーション ）はメイン CPUで動
作するが 、コントローラーは別 個 のハードウェアチップ に 搭 載され、UARTや USBで接 続さ
れ る 。こ れ は 、TCP/IPスタックはメインプロセッサ上で動作するが低位層は別個のICで
実 行される、WiFiや Ethernetなど他の技術で採用されるモデルと同様のものだ。
Bluetooth 規格では、ホストとコントローラーとが相互に対話するためのコマンドとイベ
ントのセットと、データパケ
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.