+##
+## 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 = 'TODO.'
+ longdesc = 'TODO.'
+ license = 'gplv2+'
+ inputs = ['i2c']
+ outputs = ['mlx90614']
+ probes = []
+ extra_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, ack = 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 len(self.data) == 0:
+ self.data += [databyte]
+ self.ss = ss
+ elif len(self.data) == 1:
+ self.data += [databyte]
+ self.es = es
+ else:
+ kelvin = (self.data[0] | (self.data[1] << 8)) * 0.02
+ celsius = kelvin - 273.15
+ self.putx([0, ['Temperature: %d °C' % celsius]])
+ self.putx([1, ['Temperature: %d °K' % kelvin]])
+ self.state = 'IGNORE START REPEAT'
+ self.data = []
+ else:
+ raise Exception('Invalid state: %d' % self.state)
+
projects / libsigrokdecode.git / commitdiff