Class: Pedalog::Device

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#serial ⇒ Object

Returns the value of attribute serial.



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# File 'lib/pedalog.rb', line 35

def serial
  @serial
end

Class Method Details

.find_all ⇒ Object

Finds all the connected Pedalog devices, and returns an array of Device instances to describe them.



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# File 'lib/pedalog.rb', line 38

def self.find_all
  max_devices = Interface::pedalog_get_max_devices

  device = FFI::MemoryPointer.new(Interface::PedalogDevice, max_devices, false)
  devices = max_devices.times.collect do |i|
    Interface::PedalogDevice.new(device + i * Interface::PedalogDevice.size)
  end
  
  device_count = Interface::pedalog_find_devices(device)

  result = device_count.times.collect do |i|
    devices[i].to_native
  end

  device.free

  result
end

.get_error_message(error) ⇒ Object

Gets a string describing an error code.



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# File 'lib/pedalog.rb', line 58

def self.get_error_message(error)
  max_error_message = Interface::pedalog_get_max_error_message

  ptr = FFI::MemoryPointer.new(:char, max_error_message, false)
  
  Interface::pedalog_get_error_message(error, ptr)

  message = ptr.read_string

  ptr.free
  message
end

Instance Method Details

#read_data ⇒ Object

Returns a Data instance with this device’s current values, or nil if the device has been disconnected. If nil is returned, Device.find_all should be called again to update the list of connected devices.



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# File 'lib/pedalog.rb', line 73

def read_data
  device = Interface::PedalogDevice.new
  device.from_native(self)
  
  data = Interface::PedalogData.new
  
  result = Interface::pedalog_read_data(device, data)

  return nil if result == PEDALOG_ERROR_NO_DEVICE_FOUND
  throw Device.get_error_message(result) unless result == PEDALOG_OK

  data.to_native
end