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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いため、SDの更新とアプリケーションの更新は依存関係がなく、独立して実行できる。ちょ
うど Linux のカーネルとユーザー空間ライブラリが互いに影響を与える心配なく独立して
更新できるようなものだ。
短 所 とし て は 、SoftDeviceが資源を要求するため、その分アプリケーションで利用でき
る分が減ってしまうことが挙げられる。S110 SoftDeviceにはフラッシュの最下位80KB
とSRAMの8KBが割り当てられるため、アプリケーションが使えるのはフラッシュ176KB
とSRAM 8KBだ（ 256KBバ ージョン の nRF51822を利用すると仮定した場合）。
ま た 、高 レ ベ ル の コ ード が SoftDeviceへ の 呼 び 出 し（ こ れ は ARMコ ア へ の ソ フト ウ ェ
ア割り込みによって達成される）を行う必要があるため、SoftDeviceデ ザ イン は 遅 延 とア ー
キテクチャ的な制限をもたらす。
大 規 模なエンジニアリング のタスクが 皆そうであるように、SoftDevice の数多くの利点
は多少の犠牲を必要とする。これらは主に、タイミングと厳密なリアルタイム要件に関する
ものだ。
nRF51822-EKの使い方
nRF51822の評価に関心がある人が、最初に手掛けるのに最も適したプラットフォーム
が Nordicの nRF51822-EKだ 。図 5-1に 示 す よ う に 、こ の 評 価 キ ット に は PCA10001 ...
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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.