August 2017
Intermediate to advanced
272 pages
5h 32m
Chinese
Content preview from Node.js物聯網裝置開發
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第八章 與硬體相關的 Node.js 程式庫
是 USART 的話，則由外部時脈訊號驅動傳輸工作，可得到更快的傳輸速度，並且支援
更多樣的協定。
關於硬體傳輸協定，讀者若有興趣，請參閱 Kevin Sidwar 和 Kelsey Breseman
的部落格文章「A Web Developer
’
s Guide to Communication Protocols（給
網站開發人員看的傳輸協定指南）」（
https://tessel.io/blog/108840925797/a-web-
developers-guide-tocommunication-protocols
），相當不錯的入門介紹，包含運作
原理以及為什麼你該選用此種傳輸方式。
在主機電腦上，作業系統透過軟體驅動程式連接到 UART，驅動程式負責資料的輸入與
輸出、以及訊號的組態設定（I/O 控制，或是嵌入式語言的
ioctl
）。意思是說，若想要
在筆電上使用 Node.js 與 Arduino 進行傳輸，那麼你所撰寫的 JavaScript 程式碼，實際
上是與作業系統和驅動程式溝通，藉以存取序列埠。
瞭解上述概念之後，我們便可嘗試使用 node-serialport 程式庫。首先，介紹如何在
JavaScript 程式裡掃描裝置，找到你想溝通的裝置後，下一步便可從裝置收取（有時候
也稱為「傾倒，dump」）資料，最後學習如何送出資料給裝置。
掃描裝置
終於要開始使用 serialport 程式庫囉！讓我們先建立全新的 JavaScript ...
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