Add initial rc_encode protocol decoder.

diff --git a/decoders/rc_encode/__init__.py b/decoders/rc_encode/__init__.py
new file mode 100644 (file)
index 0000000..db78dc1
--- /dev/null
+++ b/decoders/rc_encode/__init__.py
@@ -0,0 +1,36 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2018 Steve R <steversig@virginmedia.com>
+##
+## 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, see <http://www.gnu.org/licenses/>.
+##
+
+'''
+This PD decodes the remote control protocol which is frequently used
+within key fobs and power socket remotes.
+
+They contain encoding chips like the PT2262 which converts the button
+pressed and address settings into a series of pulses which is then
+transmitted over whatever frequency and modulation that the designer
+chooses. These devices operate at a number of frequencies including 433MHz.
+
+This PD should also decode the HX2262 and SC5262 which are equivalents.
+
+The decoder also contains some additional decoding for a Maplin L95AR
+remote control and will turn the received signal into which button was
+pressed and what the address code DIP switches are set to.
+'''
+
+from .pd import Decoder

diff --git a/decoders/rc_encode/pd.py b/decoders/rc_encode/pd.py
new file mode 100644 (file)
index 0000000..ec0cb99
--- /dev/null
+++ b/decoders/rc_encode/pd.py
@@ -0,0 +1,159 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2018 Steve R <steversig@virginmedia.com>
+##
+## 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, see <http://www.gnu.org/licenses/>.
+##
+
+import sigrokdecode as srd
+
+def decode_bit(edges):
+    # Datasheet says long pulse is 3 times short pulse.
+    lmin = 2 # long min multiplier
+    lmax = 5 # long max multiplier
+    eqmin = 0.5 # equal min multiplier
+    eqmax = 1.5 # equal max multiplier
+    if ( # 0 -___-___
+        (int(edges[1]) >= int(edges[0]) * lmin and int(edges[1]) <= int(edges[0]) * lmax) and
+        (int(edges[2]) >= int(edges[0]) * eqmin and int(edges[2]) <= int(edges[0]) * eqmax) and
+        (int(edges[3]) >= int(edges[0]) * lmin and int(edges[3]) <= int(edges[0]) * lmax)):
+        return '0'
+    elif ( # 1 ---_---_
+        (int(edges[0]) >= int(edges[1]) * lmin and int(edges[0]) <= int(edges[1]) * lmax) and
+        (int(edges[0]) >= int(edges[2]) * eqmin and int(edges[0]) <= int(edges[2]) * eqmax) and
+        (int(edges[0]) >= int(edges[3]) * lmin and int(edges[0]) <= int(edges[3]) * lmax)):
+        return '1'
+    elif ( # float ---_-___
+        (int(edges[1]) >= int(edges[0]) * lmin and int(edges[1]) <= int(edges[0]) * lmax) and
+        (int(edges[2]) >= int(edges[0]) * lmin and int(edges[2]) <= int(edges[0]) * lmax) and
+        (int(edges[3]) >= int(edges[0]) * eqmin and int(edges[3]) <= int(edges[0]) * eqmax)):
+        return 'f'
+    else:
+        return 'U'
+
+def pinlabels(bit_count):
+    if bit_count <= 6:
+        return 'A%i' % (bit_count - 1)
+    else:
+        return 'A%i/D%i' % (bit_count - 1, 12 - bit_count)
+
+def decode_model(model, bits):
+    if model == 'maplin_l95ar':
+        address = 'Addr' # Address pins A0 to A5
+        for i in range(0, 6):
+            address = address + ' %i:' % (i + 1) + \
+                      ('on' if bits[i][0] == '0' else 'off')
+        button = 'Button'
+        # Button pins A6/D5 to A11/D0
+        if bits[6][0] == '0' and bits[11][0] == '0':
+            button = button + ' A ON/OFF'
+        elif bits[7][0] == '0' and bits[11][0] == '0':
+            button = button + ' B ON/OFF'
+        elif bits[9][0] == '0' and bits[11][0] == '0':
+            button = button + ' C ON/OFF'
+        elif bits[8][0] == '0' and bits[11][0] == '0':
+            button = button + ' D ON/OFF'
+        else:
+            button = button + ' Unknown'
+        return ['%s' % address, bits[0][1], bits[5][2], \
+                '%s' % button, bits[6][1], bits[11][2]]
+
+class Decoder(srd.Decoder):
+    api_version = 3
+    id = 'rc_encode'
+    name = 'RC encode'
+    longname = 'Remote control encoder'
+    desc = 'PT2262/HX2262/SC5262 remote control encoder protocol.'
+    license = 'gplv2+'
+    inputs = ['logic']
+    outputs = []
+    channels = (
+        {'id': 'data', 'name': 'Data', 'desc': 'Data line'},
+    )
+    annotations = (
+        ('bits', 'Bits'),
+        ('pins', 'Pins'),
+        ('remote', 'Remote'),
+    )
+    annotation_rows = (
+        ('bits', 'Bits', (0,)),
+        ('pins', 'Pins', (1,)),
+        ('remote', 'Remote', (2,)),
+    )
+    options = (
+        {'id': 'remote', 'desc': 'Remote', 'default': 'none', 
+            'values': ('none', 'maplin_l95ar')},
+    )
+
+    def __init__(self):
+        self.reset()
+
+    def reset(self):
+        self.samplenumber_last = None
+        self.pulses = []
+        self.bits = []
+        self.labels = []
+        self.bit_count = 0
+        self.bit_first = None
+        self.bit_last = None
+        self.state = 'IDLE'
+
+    def start(self):
+        self.out_ann = self.register(srd.OUTPUT_ANN)
+        self.model = self.options['remote']
+
+    def decode(self):
+        while True:
+            pin = self.wait({0: 'e'})
+            self.state = 'DECODING'
+
+            if not self.samplenumber_last: # Set counters to start of signal.
+                self.samplenumber_last = self.samplenum
+                self.bit_first = self.samplenum
+                continue
+
+            if self.bit_count < 12: # Decode A0 to A11.
+                self.bit_count += 1
+                for i in range(0, 4): # Get four pulses for each bit.
+                    if i > 0:
+                        pin = self.wait({0: 'e'}) # Get next 3 edges.
+                    samples = self.samplenum - self.samplenumber_last
+                    self.pulses.append(samples) # Save the pulse width.
+                    self.samplenumber_last = self.samplenum
+                self.bit_last = self.samplenum
+                self.bits.append([decode_bit(self.pulses), self.bit_first,
+                                  self.bit_last]) # Save states and times.
+                self.put(self.bit_first, self.bit_last, self.out_ann,
+                         [0, [decode_bit(self.pulses)]]) # Write decoded bit.
+                self.put(self.bit_first, self.bit_last, self.out_ann,
+                         [1, [pinlabels(self.bit_count)]]) # Write pin labels.
+                self.pulses = []
+                self.bit_first = self.samplenum
+            else:
+                if self.model != 'none':
+                    self.labels = decode_model(self.model, self.bits)
+                    self.put(self.labels[1], self.labels[2], self.out_ann,
+                             [2, [self.labels[0]]]) # Write model decode.
+                    self.put(self.labels[4], self.labels[5], self.out_ann,
+                             [2, [self.labels[3]]]) # Write model decode.
+                samples = self.samplenum - self.samplenumber_last
+                pin = self.wait({'skip': 8 * samples}) # Wait for end of sync bit.
+                self.bit_last = self.samplenum
+                self.put(self.bit_first, self.bit_last, self.out_ann,
+                         [0, ['Sync']]) # Write sync label.
+                self.reset() # Reset and wait for next set of pulses.
+                self.state = 'DECODE_TIMEOUT'
+            if not self.state == 'DECODE_TIMEOUT':
+                self.samplenumber_last = self.samplenum