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mruby+組込み対話環境

吉岡 紘二(kyab)
mruby+組込みでもirbしたい!
•

目的
• ハードウェア制御の試行錯誤
• 状態の確認
• クラス/メソッド再定義

•

環境
• USBシリアルなどで対話
• RAMギリギリでも動いて欲しい
ホストベースなmirb
•

ホスト上とターゲットのボード上の協調REPL

•

ホスト:
•
•

•

ユーザ入力をコンパイル
バイトコードをターゲットに送り込む

ターゲット:
•
•

•

バイトコードを実行
実行結果を文字列にして、ホストに応答

mruby-bin-mirb-hostbasedとしてgithubにて公開
ホストベースなmirb
コンパイラ不要
!
省メモリ動作
Arduino互換ボード
chipKIT Max32
•

Digilent.inc

•

Microchip®
PIC32MX795F512
•

80MHz 32bit
MIPS

•

ROM 512kb

•

RAM 128kb
RCカー デモ
ホストベースREPL
プロトコル
ホスト

ターゲット
ENQ(0x06)

接続確立

ACK(0x05)

SOH(0x01 or 0x02(verbose))
バイトコードサイズN:2byte

バイトコード送信

!
バイトコード:Nbyte

100byteごとにACK
を返す
(シリアル受信バッファ
あふれの防止)

SOH(0x01 or 0x02(exception))
結果文字列サイズM:2byte

結果文字列受信

!
結果文字列:Mbyte

例外もinspect
して文字列で
返す
•

mruby-bin-mirb-hostbased
https://github.com/kyab/mruby-bin-mirb-hostbased

•

mruby-arduino
https://github.com/kyab/mruby-arduino
•

twitter:@kyab212

•

kyossi212@gmail.com

•

http://d.hatena.ne.jp/kyab/
補足
今後の予定
•

pryしたい!
•

高度なオブジェクト指向デバッグ

•

cdでコンテキスト移動

•

binding.mpry (?) でブレーク

•

課題:mrubyではローカル変数取れない。Bindingクラスが
ない

•

mrubyデバッグ機能と連携

•

ネットワーク対応
動作実績
•

chipKIT Max32 (RAM 128kb)

•

Arduino Due (RAM 96kb)

•

GR-SAKURA (RAM 128kb)(id:masahino123
さん http://masahino123.hatenablog.com/
entry/2013/08/16/150538)

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東京Rubyプレゼンテーション2014 mruby対話環境