Class: PiDriver::Pin

Inherits:
Object
  • Object
show all
Defined in:
lib/pi_driver/pin.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(gpio_number, options = {}) ⇒ Pin

Returns a new instance of Pin.



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# File 'lib/pi_driver/pin.rb', line 12

def initialize(gpio_number, options = {})
  @gpio_number = gpio_number

  @argument_helper = ArgumentHelper.new @gpio_number
  @argument_helper.check(:gpio_number, gpio_number, Board::VALID_NUMBERS)

  @direction = options[:direction] || Direction::INPUT
  @value = options[:value] || Value::LOW

  @file_helper = FileHelper.new @gpio_number

  @file_helper.write_export

  @argument_helper.check(:direction, @direction, Direction::VALID_DIRECTIONS)
  @file_helper.write_direction(@direction)

  @argument_helper.check(:value, @value, Value::VALID_VALUES)
  input? ? @file_helper.read_value : @file_helper.write_value(@value)
end

Instance Attribute Details

#gpio_number ⇒ Object (readonly)

Returns the value of attribute gpio_number.



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# File 'lib/pi_driver/pin.rb', line 10

def gpio_number
  @gpio_number
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 53

def clear
  return unless output?
  @value = Value::LOW
  @file_helper.write_value(@value)
  @value
end

#clear? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pi_driver/pin.rb', line 60

def clear?
  value == Value::LOW
end

#clear_interrupt ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 93

def clear_interrupt
  @interrupt_thread.kill if @interrupt_thread
end

#input ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 32

def input
  @direction = Direction::INPUT
  @file_helper.write_direction(@direction)
end

#input? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pi_driver/pin.rb', line 37

def input?
  @direction == Direction::INPUT
end

#interrupt(edge = Edge::RISING) ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 79

def interrupt(edge = Edge::RISING)
  @argument_helper.check(:edge, edge, Edge::VALID_EDGES)
  @edge = edge

  @interrupt_thread = Thread.new do
    last_value = @file_helper.read_value
    loop do
      new_value = @file_helper.read_value
      yield if block_given? && interrupted?(new_value, last_value)
      last_value = new_value
    end
  end
end

#output(value = Value::LOW) ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 41

def output(value = Value::LOW)
  @argument_helper.check(:value, value, Value::VALID_VALUES)
  @value = value
  @direction = Direction::OUTPUT
  @file_helper.write_direction(@direction)
  @file_helper.write_value(@value)
end

#output? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pi_driver/pin.rb', line 49

def output?
  @direction == Direction::OUTPUT
end

#set ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 64

def set
  return unless output?
  @value = Value::HIGH
  @file_helper.write_value(@value)
  @value
end

#set? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pi_driver/pin.rb', line 71

def set?
  value == Value::HIGH
end

#value ⇒ Object 



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# File 'lib/pi_driver/pin.rb', line 75

def value
  input? ? @file_helper.read_value : @value
end