Class: UChip::MCP2221::ChipSettings

Inherits:
Object
  • Object
show all
Defined in:
lib/uchip/mcp2221.rb

Constant Summary collapse

BIT_FIELDS = 
[]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bytes) ⇒ ChipSettings

Returns a new instance of ChipSettings.



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# File 'lib/uchip/mcp2221.rb', line 43

def initialize bytes
  @bytes = bytes
end

Instance Attribute Details

#bytes ⇒ Object (readonly)

Returns the value of attribute bytes.



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# File 'lib/uchip/mcp2221.rb', line 94

def bytes
  @bytes
end

Class Method Details

.bit_attr_accesor(name, index, offset, mask) ⇒ Object 



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# File 'lib/uchip/mcp2221.rb', line 56

def self.bit_attr_accesor name, index, offset, mask
  BIT_FIELDS << name
  define_method(name) do
    (bytes[index] >> offset) & mask
  end

  define_method(:"#{name}=") do |v|
    bytes[index] &= ~(mask << offset)
    bytes[index] |= ((mask & v) << offset)
  end
end

.bool_attr_accessor(name, index, offset) ⇒ Object 



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# File 'lib/uchip/mcp2221.rb', line 52

def self.bool_attr_accessor name, index, offset
  bit_attr_accesor name, index, offset, 0x1
end

Instance Method Details

#decode(bytes) ⇒ Object 



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# File 'lib/uchip/mcp2221.rb', line 85

def decode bytes
  BIT_FIELDS.each_with_object({}) { |n, o| o[n] = send n }.merge({
    :vid                          => bytes[4] + (bytes[5] << 8),
    :pid                          => bytes[6] + (bytes[7] << 8),
    :usb_power_attributes         => bytes[8],
    :usb_requested_mas            => bytes[9],
  })
end

#inspect ⇒ Object 



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# File 'lib/uchip/mcp2221.rb', line 47

def inspect
  to_s.sub(/>$/, " #{decode(@bytes).inspect}>")
end