Class: Smartware::Driver::Printer::EscPos

Inherits:
Object
  • Object
show all
Defined in:
lib/smartware/drivers/printer/esc_pos.rb

Constant Summary collapse

QUERY = 
[
  0x10, 0x04, 20, # Transmit Full Status
].pack("C*")
MODEL_QUERY = 
[
  0x1D, 0x49, 0x31,  # Printer model ID
].pack("C*")
VERSION_QUERY = 
[
  0x1D, 0x49, 0x33,   # Printer ROM version
].pack("C*")

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ EscPos

Returns a new instance of EscPos.



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 22

def initialize(config)
  @sp = SerialPort.new config["port"], 115200, 8, 1, SerialPort::NONE
  @sp.read_timeout = 500

  @error = nil
  @status = :ready
  @model = ''
  @version = ''
  @buf = "".force_encoding("BINARY")
end

Instance Attribute Details

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 20

def error
  @error
end

#model ⇒ Object (readonly)

Returns the value of attribute model.



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 20

def model
  @model
end

#status ⇒ Object (readonly)

Returns the value of attribute status.



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 20

def status
  @status
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 20

def version
  @version
end

Instance Method Details

#new_render ⇒ Object 



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 129

def new_render
  Render.new
end

#print(data) ⇒ Object 



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 82

def print(data)
  start = Time.now

  data.force_encoding('BINARY')

  begin
    data.split(/(\n)/, -1).each do |line|
      @sp.write line

      loop do
        now = Time.now
        # timeout exceeded
        return if now - start > 10

        status = do_query
        next if status.nil?

        paper_status, user_status, recoverable, unrecoverable = status

        # Unrecoverable error or out of paper
        return if unrecoverable != 0 || (paper_status & 1) != 0

        # No error - continue printing
        break if (recoverable == 0) && ((user_status & 3) == 0)
      end
    end

    loop do
      now = Time.now
      # timeout exceeded
      return if now - start > 10

      status = do_query
      next if status.nil?

      paper_status, user_status, recoverable, unrecoverable = status

      # paper not in motion
      break if (user_status & 8) == 0
    end

  rescue => e
    Smartware::Logging.logger.error "Printer communication error: #{e}"
    e.backtrace.each { |line| Smartware::Logging.logger.error line }
  end
end

#query ⇒ Object 



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# File 'lib/smartware/drivers/printer/esc_pos.rb', line 33

def query
  begin
    paper_status, user_status, recoverable, unrecoverable = do_query

    raise "no response to query" if paper_status.nil?

    if unrecoverable != 0
      @status = :error

      @error = Interface::Printer::HARDWARE_ERROR
    elsif (paper_status & 1) != 0
      @status = :error
      @error = Interface::Printer::OUT_OF_PAPER

    elsif (recoverable != 0) || ((user_status & 3) != 0)
      @status = :transient_error
      @error = Interface::Printer::HARDWARE_ERROR

    elsif (paper_status & 4) != 0
      @status = :warning
      @error = Interface::Printer::PAPER_NEAR_END

    else
      @status = :ready
      @error = nil
    end

    @sp.write MODEL_QUERY
    printer_model = read_response(1)
    raise "no response to model query" if printer_model.nil?

    printer_model, = printer_model.unpack("C*")

    @sp.write VERSION_QUERY
    printer_version = read_response(4)
    raise "no response to version querty" if printer_version.nil?

    @model = "ESC/POS Printer #{printer_model.to_s 16}"
    @version = "ROM #{printer_version.inspect}"

  rescue => e
    Smartware::Logging.logger.warn "Printer communication error: #{e}"
    e.backtrace.each { |line| Smartware::Logging.logger.warn line }

    @error = Interface::Printer::COMMUNICATION_ERROR
    @status = :error
  end
end