--- /dev/null
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
+##
+## 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)/i2s
+
+dist_pkgdata_DATA = __init__.py i2s.py
+
+CLEANFILES = *.pyc
+
--- /dev/null
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Joel Holdsworth <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
+##
+
+'''
+I2S protocol decoder.
+
+Details:
+TODO
+'''
+
+from .i2s import *
+
--- /dev/null
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
+##
+## 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
+##
+
+# I2S protocol decoder
+
+import sigrokdecode as srd
+
+# Annotation formats
+ANN_HEX = 0
+
+class Decoder(srd.Decoder):
+ api_version = 1
+ id = 'i2s'
+ name = 'I2S'
+ longname = 'Integrated Interchip Sound'
+ desc = 'I2S is an electrical serial bus interface standard used ' \
+ 'for connecting digital audio devices together.'
+ license = 'gplv2+'
+ inputs = ['logic']
+ outputs = ['i2s']
+ probes = [
+ {'id': 'sck', 'name': 'SCK', 'desc': 'Bit clock line'},
+ {'id': 'ws', 'name': 'WS', 'desc': 'Word select line'},
+ {'id': 'sd', 'name': 'SD', 'desc': 'Serial Data line'},
+ ]
+ annotations = [
+ ['ASCII', 'Annotations in ASCII format'],
+ ]
+
+ def __init__(self, **kwargs):
+ self.oldsck = 1
+ self.oldws = 1
+ self.bitcount = 0
+ self.data = 0
+ self.samplesreceived = 0
+ self.start_sample = None
+ self.samplenum = -1
+
+ def start(self, metadata):
+ self.out_proto = self.add(srd.OUTPUT_PROTO, 'i2s')
+ self.out_ann = self.add(srd.OUTPUT_ANN, 'i2s')
+
+ def report(self):
+ return 'I2S: %d samples received' % self.samplesreceived
+
+ def decode(self, ss, es, data):
+ for samplenum, (sck, ws, sd) in data:
+
+ # Ignore sample if the bit clock hasn't changed.
+ if sck == self.oldsck:
+ continue
+
+ self.oldsck = sck
+ if sck == 0: # Ignore the falling clock edge
+ continue
+
+ self.data = (self.data << 1) | sd
+ self.bitcount += 1
+
+ # This was not the LSB unless WS has flipped
+ if ws == self.oldws:
+ continue
+
+ # Only submit the sample, if we received the beginning of it
+ if self.start_sample != None:
+ self.samplesreceived += 1
+ self.put(self.start_sample, self.samplenum, self.out_proto,
+ ['data', self.data])
+ self.put(self.start_sample, self.samplenum, self.out_ann,
+ [ANN_HEX, ['%s %d-bits: 0x%08x' % ('L' if self.oldws else 'R',
+ self.bitcount, self.data)]])
+
+ # Reset decoder state.
+ self.data = 0
+ self.bitcount = 0
+ self.start_sample = self.samplenum
+
+ self.oldws = ws
+
\ No newline at end of file
projects / libsigrokdecode.git / commitdiff