--- /dev/null
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2015 Jeremy Swanson <jeremy@rakocontrols.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
+
+class SamplerateError(Exception):
+ pass
+
+class Decoder(srd.Decoder):
+ api_version = 2
+ id = 'dsi'
+ name = 'DSI'
+ longname = 'Digital Serial Interface Lighting'
+ desc = 'DSI lighting control protocol.'
+ license = 'gplv2+'
+ inputs = ['logic']
+ outputs = ['dsi']
+ channels = (
+ {'id': 'dsi', 'name': 'DSI', 'desc': 'DSI data line'},
+ )
+ options = (
+ {'id': 'polarity', 'desc': 'Polarity', 'default': 'active-high',
+ 'values': ('active-low', 'active-high')},
+ )
+ annotations = (
+ ('bit', 'Bit'),
+ ('startbit', 'Startbit'),
+ ('Level', 'Dimmer level'),
+ ('raw', 'Raw data'),
+ )
+ annotation_rows = (
+ ('bits', 'Bits', (0,)),
+ ('raw', 'Raw Data',(3,)),
+ ('fields', 'Fields', (1, 2,)),
+ )
+
+ def __init__(self):
+ self.samplerate = None
+ self.samplenum = None
+ self.edges, self.bits, self.ss_es_bits = [], [], []
+ self.state = 'IDLE'
+ self.nextSamplePoint = None
+ self.nextSample = None
+
+ def start(self):
+ self.out_ann = self.register(srd.OUTPUT_ANN)
+ self.old_ir = 1 if self.options['polarity'] == 'active-low' else 0
+
+ def metadata(self, key, value):
+ if key == srd.SRD_CONF_SAMPLERATE:
+ self.samplerate = value
+ # One bit: 1666.7us (one half low, one half high).
+ # This is how many samples are in 1TE.
+ self.halfbit = int((self.samplerate * 0.0016667) / 2.0)
+
+ def putb(self, bit1, bit2, data):
+ ss, es = self.ss_es_bits[bit1][0], self.ss_es_bits[bit2][1]
+ self.put(ss, es, self.out_ann, data)
+
+ def handle_bits(self, length):
+ a, c, f, g, b = 0, 0, 0, 0, self.bits
+ # Individual raw bits.
+ for i in range(length):
+ if i == 0:
+ ss = max(0, self.bits[0][0])
+ else:
+ ss = self.ss_es_bits[i - 1][1]
+ es = self.bits[i][0] + (self.halfbit * 2)
+ self.ss_es_bits.append([ss, es])
+ self.putb(i, i, [0, ['%d' % self.bits[i][1]]])
+ # Bits[0:0]: Startbit
+ s = ['Startbit: %d' % b[0][1], 'ST: %d' % b[0][1], 'ST', 'S', 'S']
+ self.putb(0, 0, [1, s])
+ self.putb(0, 0, [3, s])
+ # Bits[1:8]
+ for i in range(8):
+ f |= (b[1 + i][1] << (7 - i))
+ g = f / 2.55
+ if length == 9: # BACKWARD Frame
+ s = ['Data: %02X' % f, 'Dat: %02X' % f,
+ 'Dat: %02X' % f, 'D: %02X' % f, 'D']
+ self.putb(1, 8, [3, s])
+ s = ['Level: %d%%' % g, 'Lev: %d%%' % g,
+ 'Lev: %d%%' % g, 'L: %d' % g, 'D']
+ self.putb(1, 8, [2, s])
+ return
+
+ def reset_decoder_state(self):
+ self.edges, self.bits, self.ss_es_bits = [], [], []
+ self.state = 'IDLE'
+
+ def decode(self, ss, es, data):
+ if not self.samplerate:
+ raise SamplerateError('Cannot decode without samplerate.')
+ bit = 0;
+ for (self.samplenum, pins) in data:
+ self.ir = pins[0]
+ # data.itercnt += 1
+ if self.options['polarity'] == 'active-high':
+ self.ir ^= 1 # Invert.
+
+ # State machine.
+ if self.state == 'IDLE':
+ # Wait for any edge (rising or falling).
+ if self.old_ir == self.ir:
+ continue
+ # Add in the first half of the start bit.
+ self.edges.append(self.samplenum - int(self.halfbit))
+ self.edges.append(self.samplenum)
+ # Start bit is 0->1.
+ self.phase0 = self.ir ^ 1
+ self.state = 'PHASE1'
+ self.old_ir = self.ir
+ # Get the next sample point.
+ # self.nextSamplePoint = self.samplenum + int(self.halfbit / 2)
+ self.old_ir = self.ir
+ # bit = self.ir
+ continue
+
+ # if(self.samplenum == self.nextSamplePoint):
+ # bit = self.ir
+ # continue
+
+ if self.old_ir != self.ir:
+ self.edges.append(self.samplenum)
+ elif self.samplenum == (self.edges[-1] + int(self.halfbit * 1.5)):
+ self.edges.append(self.samplenum - int(self.halfbit * 0.5))
+ else:
+ continue
+
+ bit = self.old_ir
+ if self.state == 'PHASE0':
+ self.phase0 = bit
+ self.state = 'PHASE1'
+ elif self.state == 'PHASE1':
+ if (bit == 1) and (self.phase0 == 1): # Stop bit
+ if len(self.bits) == 17 or len(self.bits) == 9:
+ # Forward or Backward
+ self.handle_bits(len(self.bits))
+ self.reset_decoder_state() # Reset upon errors.
+ continue
+ else:
+ self.bits.append([self.edges[-3], bit])
+ self.state = 'PHASE0'
+
+ # self.nextSamplePoint = self.edges[-1] + int(self.halfbit / 2)
+
+ self.old_ir = self.ir
projects / libsigrokdecode.git / commitdiff