mruby-WiringPi

How to use

• Install WiringPI library:

    git clone git://git.drogon.net/wiringPi
    cd wiringPi
    ./build
  

• checkout mruby

git clone https://github.com/mruby/mruby.git  # original mruby
  # or
git clone https://github.com/iij/mruby.git    # iij extended mruby (File, IO, Socket, ... extend)

• edit build_config.rb

MRuby::Build.new do |conf|

  # ... (snip) ...
  conf.gem :github => 'akiray03/mruby-WiringPi'  # add this line
  conf.gem :github => 'matsumoto-r/mruby-sleep'  # add this line
end

• build ruby ./minirake
• exec sudo ./bin/mruby build/mrbgems/mruby-WiringPi/sample/sample.rb

Pin Mapping

wiringPi	GPIO (Pin#)	Name
0	17	GPIO 0
1	18	GPIO 1
2	27	GPIO 2
3	22	GPIO 3
4	23	GPIO 4
5	24	GPIO 5
6	25	GPIO 6
7	4	GPIO 7
8	2	SDA
9	3	SCL
10	8	CE0
11	7	CE1
12	10	MOSI
13	9	MISO
14	11	SCLK
15	14	TxD
16	15	RxD
17	28	GPIO 8
18	29	GPIO 9
19	30	GPIO10
20	31	GPIO11

sample

io = WiringPi::GPIO.new
pin = 0
io.mode(pin, WiringPi::OUTPUT)

5.times do
  puts "pin:#{pin} set high"
  io.write(pin, WiringPi::HIGH)
  sleep 1
  puts "pin:#{pin} set low"
  io.write(pin, WiringPi::LOW)
  sleep 1
end
io.read(pin)

• WiringPi::Serial is not tested...

sample (LCD)

• LCD control sample code for SC1602 http://akizukidenshi.com/catalog/g/gP-00038/

wiringPi	GPIO (Pin#)	Name	LCD Port
0	17	GPIO 0	DB0
1	18	GPIO 1	DB1
2	27	GPIO 2	DB2
3	22	GPIO 3	DB3
4	23	GPIO 4	DB4
5	24	GPIO 5	DB5
6	25	GPIO 6	DB6
7	4	GPIO 7	DB7
12	10	MOSI	Enable
13	9	MISO	Register Select

• The Read/Write pin must be connected to 0V/Ground.

lcd = LCD.new rows: 18, cols: 2, bits: 8, rs: 13, strb: 12, dpin: [0,1,2,3,4,5,6,7]

lcd.lcd_pos 0, 0
lcd.lcd_puts "Hello, mruby"
lcd.lcd_pos 0, 1
lcd.lcd_puts "Hi, Raspberry Pi"

TODO

• cross build support

License

This software is licensed under the same license terms of WiringPI.