Micro Python を使って組み込み Python プログラミングを行う方法を紹介

1. Micro Python 䛷
⤌䜏㎸䜏 Python
@hktechno
Hirotaka Kawata

2. @hktechno
ᕝ⏣ ⿱㈗ (䛛䜟䛯 䜂䜝䛯䛛)
● PyCon JP 2013-2014 Staff (Program Team)
● ⟃Ἴ኱Ꮫ 䝅䝇䝔䝮᝟ሗᕤᏛ◊✲⛉
䝁䞁䝢䝳䞊䝍䝃䜲䜶䞁䝇ᑓᨷ
○ ಟኈ 1ᖺ
● Open Design Computer Project
○ 2011 ᮍ㋃IT䛺䜣䛸䛛 䝇䞊䝟䞊䜽䝸䜶䜲䝍䞊
○ http://open-arch.org/

3. Micro Python
● Python for microcontrollers
○ 䝬䜲䝁䞁䛷౑䛘䜛 Python
○ KICKSTARTER 䛷 97,803 GBP (⣙1500୓෇) ⋓ᚓ
● The pyboard
○ Micro Python ⏝䛾䝬䜲䝁䞁ᇶᯈ
http://micropython.org/
㠃ⓑ䛭䛖

4. Micro Python
● Python 3 ஫᥮䛾 Python ฎ⌮⣔
○ 䝬䜲䝁䞁ྥ䛡䛻෌ᐇ⿦ (CPython 䛷䛿䛺䛔)
○ 䝷䜲䝤䝷䝸䜒ᇶᮏⓗ䛺䜒䛾䛿౑䛘䜛
● 䝬䜲䝁䞁ୖ䛷 Python 䛜ື䛟
○ Arduino 䛾䜘䛖䛺ᡭ㍍䛥
○ 䛧䛛䜒 Python 䛷᭩䛡䜛
○ Python ෆ䛷䜲䞁䝷䜲䞁䜰䝉䞁䝤䝷䛜౑䛘䛯䜚... (!!)
● REPL 䜒౑䛘䜛
○ 䝬䜲䝁䞁ୖ䛷䜲䞁䝍䝷䜽䝔䜱䝤䝅䜵䝹

5. The pyboard
● Micro Python board
○ STM32F4 (Cortex-M4)
○ microSD slot
○ microUSB
○ Accelerometer
○ 4 LED
○ Switch…
● KICKSTARTER
○ $20 (early-bird price)
○ $24

6. vs Raspberry Pi
● GPIO
○ Raspberry Pi 䛿䛱䜗䛳䛸ᑡ䛺䜑
○ (Type B+ 䛷ᑡ䛧ቑ䛘䜎䛧䛯)
● Price
○ 3940෇...
● 㛤Ⓨ䛜㠃ಽ䛟䛥䛔
○ Raspberry Pi 䛾 Linux 䛷㛤Ⓨ䛩䜛 or SSH
○ 䛭䜒䛭䜒䝬䜲䝁䞁䛷䛿䛺䛔...

7. vs mruby
ᛮ᝿䛾㐪䛔
● mruby
○ ⤌䜏㎸䜏ᶵჾ䛷 C 䛛䜙 Ruby 䜢ᢅ䛖
○ 䝋䝣䝖䜴䜵䜰䛻⤌䜏㎸䜏䜒䛷䛝䜛 (Lua 䛾䜘䛖䛺)
○ ୺䛻䚸䝞䜲䝖䝁䞁䝟䜲䝹䛧䛯䝞䜲䝘䝸䜢ᢞධ
● Micro Python
○ Python 䛷ᇶᮏⓗ䛻᏶⤖䛩䜛
○ 䝬䜲䝁䞁䚸䝩䝡䞊⏝㏵ྥ䛡
○ Python 䝇䜽䝸䝥䝖䜢᭩䛝㎸䜐
○ REPL 䛷䜲䞁䝍䝷䜽䝔䜱䝤䛻䜒᧯సྍ⬟

8. 䛧䛛䛧...
● pyboard 䛿⌧ᅾධᡭ୙ྍ⬟
○ KICKSTARTER 䛾㉎ධศ䛿Ⓨ㏦῭䜏
○ ḟ䛾䝻䝑䝖䜢⏕⏘䛩䜛䜙䛧䛔䠛
○ 䛹䛱䜙䛻䛧䛶䜒䛩䛠䛻䛿ධᡭ୙ྍ⬟...
● ண䜑Ⓩ㘓䛧䛶䛒䛳䛯ே䛾ඛ⾜㈍኎䜒...
○ ᡭඖ䛻౑䛘䜛䜹䞊䝗䛜䛺䛟䛶Ỵ῭ኻᩋ
○ Out of stock! orz

9. ㅉ䜑䜛䛾䛿䜎䛰᪩䛔䟿

10. ᡭ㍍䛻 Micro Python
● STM32F4 Discovery
○ ST Micro ⣧ṇ䛾 STM32F407 ホ౯䝪䞊䝗
○ ⛅᭶㟁Ꮚ㏻ၟ䛷 1,750 ෇
● ᶵ⬟
○ 192KB RAM
○ 1MB Flash
○ LED x 4
○ Accelerometer
○ D-class AMP
○ Microphone
○ USB (mini + micro)

11. STM32F4 Disvoery ‽ഛ
● Micro Python 䝉䝑䝖䜰䝑䝥᪉ἲ
○ https://github.
com/micropython/micropython/wiki/Board-
STM32F407-Discovery
$ cd stmhal
$ make BOARD=STM32F4DISC
● 䝣䜯䞊䝮䜴䜵䜰䜢᭩䛝᥮䛘䜛ᚲせ䛜䛒䜛
○ BOOT0 - Vdd 䜢䝅䝵䞊䝖
■ ⿬ഃ䛾䝆䝱䞁䝟䜢౑䛖䛸䜘䛔 (JP2, JP3)
○ DFU (dfu-util) 䛷 build/flash.dfu 䜢᭩䛝㎸䜏
■ microUSB 䛾᪉䜢౑䛖䚹䛯䛰䛧㟁※౪⤥䛥䜜䛺䛔䛾䛷୧᪉่䛩䚹

12. ᥋⥆䞉᭩䛝㎸䜏
● USB 䝇䝖䝺䞊䝆䛸䛧䛶ㄆ㆑䛩䜛
○ boot.py: ㉳ື᫬䛻ᐇ⾜䛥䜜䜛
○ main.py: 䝯䜲䞁䝥䝻䜾䝷䝮
○ 䝋䞊䝇 (main.py) 䜢䝁䝢䞊䛩䜛䛰䛡䛷Ⰻ䛔
○ ⮬ศ䛷స䛳䛯䝰䝆䝳䞊䝹䜒᭩䛝㎸䜏䞉฼⏝䛷䛝䜛
● REPL 䜢❧䛱ୖ䛢䜛
○ USB ௬᝿䝅䝸䜰䝹䝫䞊䝖䜒స䜙䜜䜛
■ Linux 䛾ሙྜ /dev/ttyACM0
○ ᥋⥆䛩䜛䛸 Micro Python REPL 䝅䜵䝹䛜౑䛘䜛

13. pyb Module
● pyboard 䜢᧯స䛩䜛䝰䝆䝳䞊䝹
○ pyb.Pin
○ pyb.LED
○ pyb.Switch
○ pyb.SPI
○ pyb.I2C
○ pyb.UART...
○ http://micropython.org/doc/module/pyb/
● pyboard ྥ䛡䛰䛜...
○ Discovery 䝪䞊䝗䛷䜒୍㒊䛿฼⏝ྍ⬟

14. Micro Python REPL
● Python 䛾 REPL 䛸䜋䜌ྠ䛨
○ 䜲䞁䝍䝷䜽䝔䜱䝤䛻䝬䜲䝁䞁䜢᧯స䛷䛝䜛
○ 䝕䝞䝑䜾䛻౽฼
○ 䝰䝆䝳䞊䝹䜢᭩䛝㎸䜣䛷䛚䛡䜀䚸䛭䜜䜒౑䛘䜛
● Ctrl-D 䛷 soft-reset
○ main.py 䜔䝰䝆䝳䞊䝹䜢᭩䛝᥮䛘䛯᫬䛻౑䛖
● Ctrl-C 䛷 interrupt
○ main.py 䛾ᐇ⾜䜢Ṇ䜑䜛

15. LED ON / OFF
● 䛸䜚䛒䛘䛪 L 䝏䜹
led = pyb.LED(1)
while True:
led.off()
pyb.delay(500)
led.on()
pyb.delay(500)
䛣䜜䛷䜒䜘䛔
led = pyb.LED(1)
while True:
led.toggle()
pyb.delay(500)

16. Switch
● Switch 䛷 Callback 䛜౑䛘䜛
def toggle():
pyb.LED(1).toggle()
pyb.delay(10)
sw = pyb.Switch()
sw.callback(toggle)

17. GPIO
● pyb.Pin 䜢౑䛖
pin = pyb.Pin(pyb.Pin.board.PD2,
pyb.Pin.OUT_PP)
pin.high()
pin.low()
pin_value = pin.value()
pin.value(False) # => pin.low()

18. STM32F4DISC STAccel
● 䠎✀㢮䛾ຍ㏿ᗘ䝉䞁䝃䞊
○ 䝪䞊䝗䛾䝻䝑䝖䛻䜘䛳䛶㐪䛖
○ LIS302DL (ྂ䛔)
○ LIS3DSH (᪂䛧䛔, 㧗ᶵ⬟)
● staccel.py : STAccel # pyb.Accel 䛿 pyboard ᑓ⏝
○ ᡭ㍍䛻ຍ㏿ᗘ䝉䞁䝃䜢ᢅ䛘䜛䝰䝆䝳䞊䝹
○ stmhal/boards/STM32F4DISC/staccel.py
○ LIS3DSH ᑐᛂ䝟䝑䝏䜢ᢞ䛢䛶 merge 䛥䜜䛯
○ https://github.com/micropython/micropython/pull/852

19. LCD
ᕷ㈍䛾 LCD 䜢౑䛖 # pyb.LCD 䛿䚸pyboard ᑓ⏝
● SC1602 䝅䝸䞊䝈 (ᐃ␒䛾䜰䝺)
○ ⛅᭶㟁Ꮚ㏻ၟ䛷኎䛳䛶䜎䛩
○ 䝞䝑䜽䝷䜲䝖䛺䛧䛷䛒䜜䜀 500 ෇䛛䜙
● Python 䛷 LCD 䝗䝷䜲䝞䜢᭩䛔䛶䜏䜎䛧䛯
○ https://github.com/techno/micropython_modules
○ sc1602.py

20. 䛔䜝䛔䜝 DEMO

21. Performance
● (ᙜ䛯䜚๓䛰䛡䛹) ⤖ᵓ㐜䛔
○ Teensy 3.1 (96MHz ARM)
○ C++ (Arduino like) 䛸䛟䜙䜉䛶䚸⣙ 100 ಸ㐜䛔
○ https://github.
com/micropython/micropython/wiki/Performance
● Arduino 䛷༑ศ䛺⏝㏵䛺䜙ၥ㢟䛻䛺䜙䛺䛔
○ Arduino Pro Mini (C++) 䛛䜙ẚ䜉䛶4ಸ䛠䜙䛔
○ 䛫䛳䛛䛟㏿䛔䜽䝻䝑䜽ᩘ䛿↓㥏䛻䛺䜛䛜...

22. Inline Assembly
䜲䞁䝷䜲䞁䜰䝉䞁䝤䝷䛾౛
@micropython.asm_thumb
def asm_add(r0, r1):
add(r0, r0, r1)

23. Development Sprint
● 14᪥ Development Sprint 䜔䜚䜎䛩
○ http://pyconjp.connpass.com/event/8105/
● Micro Python Sprint
○ ゐ䛳䛯䛣䛸䛺䛔ே䛷䜒 OK
○ STM32F4 Discovery 䝪䞊䝗䜢ᣢ䛳䛶䛟䜛䛸 Better
● 䜔䜚䛯䛔䛣䛸䛸䛛
○ 䝪䞊䝗ᦚ㍕䛾D⣭䜰䞁䝥䞉䝬䜲䜽䛾䝗䝷䜲䝞
○ ௚䛾䝪䞊䝗䜈⛣᳜

24. ௚䛾䝬䜲䝁䞁䜈䛾⛣᳜
● GR-SAKURA 䜈⛣᳜䜢ヨ䜏䛯
○ Renesas RX63N
● 㐍ᤖ
○ 䜲䞁䝍䝥䝸䝍䛿ື䛔䛯
○ print 䛿䛷䛝䜛
○ 䜎䛰: pyb 䝰䝆䝳䞊䝹
○ 䜎䛰: REPL
⤖ㄽ: 䜎䛰STM32௨እ䛻⛣᳜䛩䜛䛾䛿኱ኚ䛭䛖
⯆࿡䛜䛒䛳䛯䜙 Sprint or Office hour 䛷...

25. 䜎䛸䜑
● Micro Python 䛺䛛䛺䛛䜘䛥䛭䛖
○ 䛯䛰䛧䚸䜎䛰䜎䛰ᨵၿ䛾వᆅ䛜䛒䜚䛭䛖
○ ௚䛾䝪䞊䝗䜈䛾⛣᳜䛻ᮇᚅ
● Raspberry Pi ౑䛳䛯䜋䛖䛜Ⰻ䛥䛭䛖䛺⏝㏵
○ 䝛䝑䝖䝽䞊䜽
○ Wi-Fi, Bluetooth
○ USB…
䝪䞊䝗䛰䛡䛷᏶⤖䛩䜛䛺䜙 Micro Python䟿