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Diffstat (limited to 'decoders/i2s/i2s.py')
| -rw-r--r-- | decoders/i2s/i2s.py | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/decoders/i2s/i2s.py b/decoders/i2s/i2s.py deleted file mode 100644 index b921011..0000000 --- a/decoders/i2s/i2s.py +++ /dev/null @@ -1,124 +0,0 @@ -## -## 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 = 'Serial bus for connecting digital audio devices.' - 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'}, - ] - optional_probes = [] - options = {} - annotations = [ - ['Hex', 'Annotations in hex format'], - ] - - def __init__(self, **kwargs): - self.oldsck = 1 - self.oldws = 1 - self.bitcount = 0 - self.data = 0 - self.samplesreceived = 0 - self.first_sample = None - self.start_sample = None - self.samplenum = -1 - self.wordlength = -1 - - def start(self, metadata): - self.samplerate = metadata['samplerate'] - self.out_proto = self.add(srd.OUTPUT_PROTO, 'i2s') - self.out_ann = self.add(srd.OUTPUT_ANN, 'i2s') - - def report(self): - - # Calculate the sample rate. - samplerate = '?' - if self.start_sample != None and \ - self.first_sample != None and \ - self.start_sample > self.first_sample: - samplerate = '%d' % (self.samplesreceived * - self.samplerate / (self.start_sample - - self.first_sample)) - - return 'I2S: %d %d-bit samples received at %sHz' % \ - (self.samplesreceived, self.wordlength, samplerate) - - 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: 0x%08x' % ('L' if self.oldws else 'R', - self.data)]]) - - # Check that the data word was the correct length. - if self.wordlength != -1 and self.wordlength != self.bitcount: - self.put(self.start_sample, self.samplenum, self.out_ann, - [ANN_HEX, ['WARNING: Received a %d-bit word, when a ' - '%d-bit word was expected' % (self.bitcount, - self.wordlength)]]) - - self.wordlength = self.bitcount - - # Reset decoder state. - self.data = 0 - self.bitcount = 0 - self.start_sample = self.samplenum - - # Save the first sample position. - if self.first_sample == None: - self.first_sample = self.samplenum - - self.oldws = ws - |