[libsigrokdecode.git] / decoders / mlx90614 / pd.py

##
## This file is part of the sigrok 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 degrees Kelvin'],
    ]

    def __init__(self, **kwargs):
        self.state = 'IGNORE START REPEAT'
        self.data = []

    def start(self, metadata):
        # self.out_proto = self.add(srd.OUTPUT_PROTO, 'mlx90614')
        self.out_ann = self.add(srd.OUTPUT_ANN, 'mlx90614')

    def report(self):
        pass

    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)
Commit	Line	Data
	1	##
	2	## This file is part of the sigrok project.
	3	##
	4	## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
	5	##
	6	## This program is free software; you can redistribute it and/or modify
	7	## it under the terms of the GNU General Public License as published by
	8	## the Free Software Foundation; either version 2 of the License, or
	9	## (at your option) any later version.
	10	##
	11	## This program is distributed in the hope that it will be useful,
	12	## but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	## GNU General Public License for more details.
	15	##
	16	## You should have received a copy of the GNU General Public License
	17	## along with this program; if not, write to the Free Software
	18	## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	##
	20
	21	# Melexis MLX90614 Infrared Thermometer protocol decoder
	22
	23	import sigrokdecode as srd
	24
	25	class Decoder(srd.Decoder):
	26	api_version = 1
	27	id = 'mlx90614'
	28	name = 'MLX90614'
	29	longname = 'Melexis MLX90614'
	30	desc = 'Infrared Thermometer protocol.'
	31	license = 'gplv2+'
	32	inputs = ['i2c']
	33	outputs = ['mlx90614']
	34	probes = []
	35	optional_probes = []
	36	options = {}
	37	annotations = [
	38	['Celsius', 'Temperature in degrees Celsius'],
	39	['Kelvin', 'Temperature in degrees Kelvin'],
	40	]
	41
	42	def __init__(self, **kwargs):
	43	self.state = 'IGNORE START REPEAT'
	44	self.data = []
	45
	46	def start(self, metadata):
	47	# self.out_proto = self.add(srd.OUTPUT_PROTO, 'mlx90614')
	48	self.out_ann = self.add(srd.OUTPUT_ANN, 'mlx90614')
	49
	50	def report(self):
	51	pass
	52
	53	def putx(self, data):
	54	self.put(self.ss, self.es, self.out_ann, data)
	55
	56	# Quick hack implementation! This needs to be improved a lot!
	57	def decode(self, ss, es, data):
	58	cmd, databyte = data
	59
	60	# State machine.
	61	if self.state == 'IGNORE START REPEAT':
	62	if cmd != 'START REPEAT':
	63	return
	64	self.state = 'IGNORE ADDRESS WRITE'
	65	elif self.state == 'IGNORE ADDRESS WRITE':
	66	if cmd != 'ADDRESS WRITE':
	67	return
	68	self.state = 'GET TEMPERATURE'
	69	elif self.state == 'GET TEMPERATURE':
	70	if cmd != 'DATA WRITE':
	71	return
	72	if len(self.data) == 0:
	73	self.data.append(databyte)
	74	self.ss = ss
	75	elif len(self.data) == 1:
	76	self.data.append(databyte)
	77	self.es = es
	78	else:
	79	kelvin = (self.data[0] \| (self.data[1] << 8)) * 0.02
	80	celsius = kelvin - 273.15
	81	self.putx([0, ['Temperature: %3.2f °C' % celsius]])
	82	self.putx([1, ['Temperature: %3.2f °K' % kelvin]])
	83	self.state = 'IGNORE START REPEAT'
	84	self.data = []
	85	else:
	86	raise Exception('Invalid state: %s' % self.state)
	87