mirror of
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117 lines
4.0 KiB
Python
117 lines
4.0 KiB
Python
##
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## This file is part of the libsigrokdecode project.
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##
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## Copyright (C) 2019 Ben Dooks <ben.dooks@codethink.co.uk>
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, see <http://www.gnu.org/licenses/>.
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##
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import sigrokdecode as srd
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MAX_CHANNELS = 8
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class Decoder(srd.Decoder):
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api_version = 3
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id = 'tdm_audio'
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name = 'TDM audio'
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longname = 'Time division multiplex audio'
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desc = 'TDM multi-channel audio protocol.'
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license = 'gplv2+'
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inputs = ['logic']
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outputs = []
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tags = ['Audio']
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channels = (
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{ 'id': 'clock', 'name': 'Bitclk', 'desc': 'Data bit clock' },
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{ 'id': 'frame', 'name': 'Framesync', 'desc': 'Frame sync' },
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{ 'id': 'data', 'name': 'Data', 'desc': 'Serial data' },
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)
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options = (
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{'id': 'bps', 'desc': 'Bits per sample', 'default': 16 },
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{'id': 'channels', 'desc': 'Channels per frame', 'default': MAX_CHANNELS },
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{'id': 'edge', 'desc': 'Clock edge to sample on', 'default': 'rising', 'values': ('rising', 'falling') }
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)
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annotations = tuple(('ch%d' % i, 'Ch%d' % i) for i in range(MAX_CHANNELS))
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annotation_rows = tuple(('ch%d-vals' % i, 'Ch%d' % i, (i,)) for i in range(MAX_CHANNELS))
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def __init__(self):
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self.reset()
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def reset(self):
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self.samplerate = None
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self.channels = MAX_CHANNELS
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self.channel = 0
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self.bitdepth = 16
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self.bitcount = 0
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self.samplecount = 0
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self.lastsync = 0
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self.lastframe = 0
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self.data = 0
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self.ss_block = None
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def metdatadata(self, key, value):
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if key == srd.SRD_CONF_SAMPLERATE:
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self.samplerate = value
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def start(self):
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self.out_ann = self.register(srd.OUTPUT_ANN)
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self.bitdepth = self.options['bps']
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self.edge = self.options['edge']
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def decode(self):
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while True:
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# Wait for edge of clock (sample on rising/falling edge).
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clock, frame, data = self.wait({0: self.edge[0]})
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self.data = (self.data << 1) | data
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self.bitcount += 1
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if self.ss_block is not None:
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if self.bitcount >= self.bitdepth:
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self.bitcount = 0
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self.channel += 1
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c1 = 'Channel %d' % self.channel
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c2 = 'C%d' % self.channel
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c3 = '%d' % self.channel
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if self.bitdepth <= 8:
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v = '%02x' % self.data
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elif self.bitdepth <= 16:
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v = '%04x' % self.data
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else:
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v = '%08x' % self.data
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if self.channel < self.channels:
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ch = self.channel
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else:
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ch = 0
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self.put(self.ss_block, self.samplenum, self.out_ann,
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[ch, ['%s: %s' % (c1, v), '%s: %s' % (c2, v),
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'%s: %s' % (c3, v)]])
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self.data = 0
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self.ss_block = self.samplenum
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self.samplecount += 1
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# Check for new frame.
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# Note, frame may be a single clock, or active for the first
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# sample in the frame.
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if frame != self.lastframe and frame == 1:
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self.channel = 0
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self.bitcount = 0
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self.data = 0
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if self.ss_block is None:
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self.ss_block = 0
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self.lastframe = frame
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