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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Bluetooth Low Energyをはじめよう 5. ハ ード ウェアプラットフォーム
完全にフラッシュベースのデバイスであることが、製品設計者にとって重要な
nRF51822の差別化要因だ。つまり、書き換え可能なフラッシュメモリにBLEスタック が
書き込まれているため 、必 ずしも新しいリビジョンのシリコンを必 要とせず 、コアスペックの
進 化 に 追 随してアップ デ ートすることができる 。
この選択の短所としては、ROM ベ ー ス の ソ リ ュ ー シ ョ ン と 比 較 し て 、デ バ イ ス ご と の 製
造コストが多少上乗せされるという点がある。しかしBluetoothコア 規 格が 速い ペースで
発 展していることを考えれば 、このギャンブルは 長 い目で 見て 利 益をもたらすだろう。これによっ
てNordicは 、低 コ スト の ROM ベースのチップを選 択した他 のシリコンベンダーよりも、す
ばやく最新スペックをサポートした製品を市場へ投入できる可能性があるからだ。
SoftDeviceアーキテクチャ
Nordicは（ 独 自 の 2.4GHzプ ロト コ ル や ANT+など BLE 以外の標準に利用すること
も可能な）チップ上に BLEサポートを実装するために、同社がSoftDevice（SD）と 呼 ん
でいるものを利用している。SoftDeviceは、基本的にフラッシュメモリの最下位に位置
す るブ ラック ボック ス で 、BLEスタ
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.