Add AD5626 decoder from libsigrokdecode codebase

libsigrokdecode4DSL/decoders/ad5626/__init__.py

@@ -0,0 +1,25 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2020 Analog Devices Inc.
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+##
+
+'''
+This decoder stacks on top of the 'spi' PD and decodes the
+Analog Devices AD5626 protocol.
+'''
+
+from .pd import Decoder

libsigrokdecode4DSL/decoders/ad5626/pd.py

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+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2020 Analog Devices Inc.
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+##
+
+import sigrokdecode as srd
+
+class Decoder(srd.Decoder):
+    api_version = 3
+    id = 'ad5626'
+    name = 'AD5626'
+    longname = 'Analog Devices AD5626'
+    desc = 'Analog Devices AD5626 12-bit nanoDAC.'
+    license = 'gplv2+'
+    inputs = ['spi']
+    outputs = []
+    tags = ['IC', 'Analog/digital']
+    annotations = (
+        ('voltage', 'Voltage'),
+    )
+
+    def __init__(self,):
+        self.reset()
+
+    def reset(self):
+        self.data = 0
+        self.ss = 0
+
+    def start(self):
+        self.out_ann = self.register(srd.OUTPUT_ANN)
+
+    def decode(self, ss, es, data):
+        ptype = data[0]
+
+        if ptype == 'CS-CHANGE':
+            cs_old, cs_new = data[1:]
+            if cs_old is not None and cs_old == 0 and cs_new == 1:
+                self.data >>= 1
+                self.data /= 1000
+                self.put(self.ss, es, self.out_ann, [0, ['%.3fV' % self.data]])
+                self.data = 0
+            elif cs_old is not None and cs_old == 1 and cs_new == 0:
+                self.ss = ss
+        elif ptype == 'BITS':
+            mosi = data[1]
+            for bit in reversed(mosi):
+                self.data = self.data | bit[0]
+                self.data <<= 1