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Subscribecgo 與 channel 的陷阱如何造成讀取 usb message 失敗 - lschyi
tags:
COSCUP2020中階TR214歡迎來到 https://hackmd.io/@coscup/2020 共筆
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Learn More →點擊本頁上方的 開始用 Markdown 一起寫筆記！
手機版請點選上方 按鈕展開議程列表。
講者使用很酷的人體工學鍵盤: ErgodoxTW
為了找到最適合自己的鍵盤按鍵自定義設定，需要從韌體去紀錄實際上按下了哪一個位置按鍵，而不是
ctrl,shift的訊號講者使用 QMK firmware，去接受到 usb keyboard 的 debug log ?
Log format
listener
使用
golang實作一個 HID listenerv1
用 for loop 一直去讀 log，一個一個字元？
結果怪怪 der
cgo call 成本很高，講者做了一個 benchmark 差了幾乎將至 100 倍
解法：在
C裡面多讀一點再丟到golanglistenerv2
跑起來卡住了？但每個 unit test 都過了
因為讀 HID 要一直 pulling ，其 timing 是很重要的
但 go channel 是有 lock 的，即便是 buffered channel
還是需要拿到 lock 才能寫入
因此整個程式 sequential 執行被影響到
結論
C工商
phoenix keyboard