srd: Melexis MLX90614 Infrared Thermometer decoder.

3 files changed, 136 insertions, 0 deletions

diff --git a/decoders/mlx90614/Makefile.am b/decoders/mlx90614/Makefile.am
new file mode 100644
index 0000000..f14874f
--- /dev/null
+++ b/decoders/mlx90614/Makefile.am
@@ -0,0 +1,26 @@
+##
+## 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
+##
+
+pkgdatadir = $(DECODERS_DIR)/mlx90614
+
+dist_pkgdata_DATA = __init__.py mlx90614.py
+
+CLEANFILES = *.pyc
+
diff --git a/decoders/mlx90614/__init__.py b/decoders/mlx90614/__init__.py
new file mode 100644
index 0000000..fd62251
--- /dev/null
+++ b/decoders/mlx90614/__init__.py
@@ -0,0 +1,22 @@
+##
+## 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
+##
+
+from .mlx90614 import *
+
diff --git a/decoders/mlx90614/mlx90614.py b/decoders/mlx90614/mlx90614.py
new file mode 100644
index 0000000..fa1621c
--- /dev/null
+++ b/decoders/mlx90614/mlx90614.py
@@ -0,0 +1,88 @@
+##
+## 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)
+