Class: Escalator::IntelHex

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(codes, offset = 0) ⇒ IntelHex

Returns a new instance of IntelHex.



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# File 'lib/escalator/intel_hex.rb', line 46

def initialize codes, offset = 0
  @offset = offset
  @codes = codes
end

Instance Attribute Details

#codes ⇒ Object (readonly)

Returns the value of attribute codes.



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# File 'lib/escalator/intel_hex.rb', line 28

def codes
  @codes
end

#offset ⇒ Object (readonly)

Returns the value of attribute offset.



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# File 'lib/escalator/intel_hex.rb', line 28

def offset
  @offset
end

Class Method Details

.load(path) ⇒ Object 



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# File 'lib/escalator/intel_hex.rb', line 30

def self.load path
  offset = 0
  codes = []
  File.read(path).lines.each do |l|
    case l[7,2]
    when "00"
      address = l[3,4].to_i(16)
      offset ||= address
      l.chomp[9..-3].each_char.each_slice(2).each_with_index do |pair, i|
        codes[address - offset + i] = pair.join("").to_i(16)
      end
    end
  end
  new codes, offset
end

Instance Method Details

#dump ⇒ Object 



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# File 'lib/escalator/intel_hex.rb', line 55

def dump
  addr = offset
  lines = []
  @codes.each_slice(16) do |line_codes|
    c = line_codes.size
    s = ":#{c.to_s(16).rjust(2, '0')}"
    s << "#{addr.to_s(16).rjust(4, '0')}"
    s << "00"
    line_codes.each do |code|
      s << "#{code.to_s(16).rjust(2, '0')}"
    end
    check_sum = 256 - (s[1..-1].scan(/.{2}/).inject(0){|sum, code| sum += code.to_i(16)} & 0xff)
    s << "#{check_sum.to_s(16).rjust(2, '0')}"
    lines << s
    addr += c
  end

  lines << ":00000001FF"
  lines << ""
  lines.join("\n")
end

#write_to(path) ⇒ Object 



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# File 'lib/escalator/intel_hex.rb', line 51

def write_to path
  File.write(path, dump)
end