gainer.rbのデジタル・アナログ入力処理を読んでみた

以下、該当部分。

@analog_input  = []

@digital_input = []

attr_reader :led, :analog_input, :digital_input, :analog_output, :digital_output

def peek_digital_input

command('R')

end



def peek_analog_input

command('I')

end

def process_next_event(wait = nil)

reply = next_event

sleep(wait) if wait

process_event(reply)

end



private

def command(cmd, args = {})

command_send(cmd + '*')

process_next_event(args[:wait])

end



def process_event(event)

case event

when '!*'

raise

when 'h*'

@led = true

when 'l*'

@led = false

when 'N*'

@on_pressed.call

when 'F*'

@on_released.call

when /^I([0-9A-F]+)\*$/

s = $1

s.scan(/../).each_with_index do |s, i|

@analog_input[i] = s.to_i(16)

end

when /^R([0-9A-F]+)\*$/

s = $1

s.reverse.scan(/./).each_with_index do |s, i|

@digital_input[i] = s.to_i(16)

end

end

end

思ったよりもかなり簡単。