text: ##
  ## This file is part of the libsigrokdecode project.
  ##
  ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
  ##
  ## This program is free software; you can redistribute it and/or modify
  ## it under the terms of the GNU General Public License as published by
  ## the Free Software Foundation; either version 2 of the License, or
  ## (at your option) any later version.
  ##
  ## This program is distributed in the hope that it will be useful,
  ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ## GNU General Public License for more details.
  ##
  ## You should have received a copy of the GNU General Public License
  ## along with this program; if not, write to the Free Software
  ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  ##
  
  # Melexis MLX90614 Infrared Thermometer protocol decoder
  
  import sigrokdecode as srd
  
  class Decoder(srd.Decoder):
      api_version = 1
      id = 'mlx90614'
      name = 'MLX90614'
      longname = 'Melexis MLX90614'
      desc = 'Infrared Thermometer protocol.'
      license = 'gplv2+'
      inputs = ['i2c']
      outputs = ['mlx90614']
      probes = []
      optional_probes = []
      options = {}
      annotations = [
          ['Celsius', 'Temperature in degrees Celsius'],
          ['Kelvin', 'Temperature in Kelvin'],
      ]
  
      def __init__(self, **kwargs):
          self.state = 'IGNORE START REPEAT'
          self.data = []
  
      def start(self):
          # self.out_proto = self.register(srd.OUTPUT_PYTHON)
          self.out_ann = self.register(srd.OUTPUT_ANN)
  
      def putx(self, data):
          self.put(self.ss, self.es, self.out_ann, data)
  
      # Quick hack implementation! This needs to be improved a lot!
      def decode(self, ss, es, data):
          cmd, databyte = data
  
          # State machine.
          if self.state == 'IGNORE START REPEAT':
              if cmd != 'START REPEAT':
                  return
              self.state = 'IGNORE ADDRESS WRITE'
          elif self.state == 'IGNORE ADDRESS WRITE':
              if cmd != 'ADDRESS WRITE':
                  return
              self.state = 'GET TEMPERATURE'
          elif self.state == 'GET TEMPERATURE':
              if cmd != 'DATA WRITE':
                  return
              if len(self.data) == 0:
                  self.data.append(databyte)
                  self.ss = ss
              elif len(self.data) == 1:
                  self.data.append(databyte)
                  self.es = es
              else:
                  kelvin = (self.data[0] | (self.data[1] << 8)) * 0.02
                  celsius = kelvin - 273.15
                  self.putx([0, ['Temperature: %3.2f °C' % celsius]])
                  self.putx([1, ['Temperature: %3.2f K' % kelvin]])
                  self.state = 'IGNORE START REPEAT'
                  self.data = []
          else:
              raise Exception('Invalid state: %s' % self.state)
  
  