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79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
##
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## This file is part of the libsigrokdecode project.
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##
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## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, see <http://www.gnu.org/licenses/>.
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##
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import sigrokdecode as srd
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class Decoder(srd.Decoder):
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api_version = 3
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id = 'mlx90614'
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name = 'MLX90614'
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longname = 'Melexis MLX90614'
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desc = 'Melexis MLX90614 infrared thermometer protocol.'
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license = 'gplv2+'
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inputs = ['i2c']
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outputs = []
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tags = ['IC', 'Sensor']
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annotations = (
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('celsius', 'Temperature in degrees Celsius'),
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('kelvin', 'Temperature in Kelvin'),
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)
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def __init__(self):
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self.reset()
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def reset(self):
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self.state = 'IGNORE START REPEAT'
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self.data = []
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def start(self):
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self.out_ann = self.register(srd.OUTPUT_ANN)
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def putx(self, data):
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self.put(self.ss, self.es, self.out_ann, data)
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# Quick hack implementation! This needs to be improved a lot!
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def decode(self, ss, es, data):
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cmd, databyte = data
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# State machine.
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if self.state == 'IGNORE START REPEAT':
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if cmd != 'START REPEAT':
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return
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self.state = 'IGNORE ADDRESS WRITE'
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elif self.state == 'IGNORE ADDRESS WRITE':
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if cmd != 'ADDRESS WRITE':
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return
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self.state = 'GET TEMPERATURE'
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elif self.state == 'GET TEMPERATURE':
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if cmd != 'DATA WRITE':
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return
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if len(self.data) == 0:
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self.data.append(databyte)
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self.ss = ss
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elif len(self.data) == 1:
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self.data.append(databyte)
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self.es = es
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else:
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kelvin = (self.data[0] | (self.data[1] << 8)) * 0.02
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celsius = kelvin - 273.15
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self.putx([0, ['Temperature: %3.2f °C' % celsius]])
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self.putx([1, ['Temperature: %3.2f K' % kelvin]])
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self.state = 'IGNORE START REPEAT'
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self.data = []
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