mirror of
https://github.com/DreamSourceLab/DSView.git
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243 lines
9.0 KiB
Python
243 lines
9.0 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 Uli Huber
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## Copyright (C) 2020 Soeren Apel
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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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ann_bit, ann_stat_bit, ann_type, ann_command, ann_parameter, ann_parity, ann_pos, ann_status, ann_warning = range(9)
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frame_type_none, frame_type_command, frame_type_16bit_pos, frame_type_18bit_pos = range(4)
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class Decoder(srd.Decoder):
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api_version = 3
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id = 'xy2-100'
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name = 'XY2-100'
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longname = 'XY2-100(E) and XY-200(E) galvanometer protocol'
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desc = 'Serial protocol for galvanometer positioning in laser systems'
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license = 'gplv2+'
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inputs = ['logic']
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outputs = []
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tags = ['Embedded/industrial']
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channels = (
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{'id': 'clk', 'name': 'CLK', 'desc': 'Clock', 'idn':'dec_xy2-100_chan_clk'},
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{'id': 'sync', 'name': 'SYNC', 'desc': 'Sync', 'idn':'dec_xy2-100_chan_sync'},
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{'id': 'data', 'name': 'DATA', 'desc': 'X, Y or Z axis data', 'idn':'dec_xy2-100_chan_data'},
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)
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optional_channels = (
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{'id': 'status', 'name': 'STAT', 'desc': 'X, Y or Z axis status', 'idn':'dec_xy2-100_opt_chan_status'},
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)
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annotations = (
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('bit', 'Data Bit'),
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('stat_bit', 'Status Bit'),
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('type', 'Frame Type'),
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('command', 'Command'),
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('parameter', 'Parameter'),
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('parity', 'Parity'),
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('position', 'Position'),
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('status', 'Status'),
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('warning', 'Human-readable warnings'),
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)
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annotation_rows = (
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('bits', 'Data Bits', (ann_bit,)),
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('stat_bits', 'Status Bits', (ann_stat_bit,)),
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('data', 'Data', (ann_type, ann_command, ann_parameter, ann_parity)),
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('positions', 'Positions', (ann_pos,)),
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('statuses', 'Statuses', (ann_status,)),
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('warnings', 'Warnings', (ann_warning,)),
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)
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def __init__(self):
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self.samplerate = None
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self.reset()
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def reset(self):
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self.bits = []
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self.stat_bits = []
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self.stat_skip_bit = True
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def metadata(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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def put_ann(self, ss, es, ann_class, value):
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self.put(ss, es, self.out_ann, [ann_class, value])
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def process_bit(self, sync, bit_ss, bit_es, bit_value):
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self.put_ann(bit_ss, bit_es, ann_bit, ['%d' % bit_value])
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self.bits.append((bit_ss, bit_es, bit_value))
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if sync == 0:
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if len(self.bits) < 20:
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self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Not enough data bits'])
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self.reset()
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return
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# Bit structure:
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# 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
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# T --------------- 18-bit pos ----------------- PARITY or
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# -TYPE-- ------------ 16-bit pos -------------- PARITY or
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# -TYPE-- -8-bit command -8-bit parameter value- PARITY
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# Calculate parity, excluding the parity bit itself
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parity = 0
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for ss, es, value in self.bits[:-1]:
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parity ^= value
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par_ss, par_es, par_value = self.bits[19]
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parity_even = 0
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parity_odd = 0
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if (par_value == parity):
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parity_even = 1
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else:
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parity_odd = 1
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type_1_value = self.bits[0][2]
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type_3_value = (self.bits[0][2] << 2) | (self.bits[1][2] << 1) | self.bits[2][2]
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# Determine frame type
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type = frame_type_none
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parity_status = ['X', 'Unknown']
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type_ss = self.bits[0][0]
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type_es = self.bits[2][1]
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### 18-bit position
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if (type_1_value == 1) and (parity_odd == 1):
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type = frame_type_18bit_pos
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type_es = self.bits[0][1]
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self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Careful: 18-bit position frames with wrong parity and command frames with wrong parity cannot be identified'])
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### 16-bit position
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elif (type_3_value == 1):
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type = frame_type_16bit_pos
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if (parity_even == 1):
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parity_status = ['OK']
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else:
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parity_status = ['NOK']
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self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Parity error', 'PE'])
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### Command
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elif (type_3_value == 7) and (parity_even == 1):
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type = frame_type_command
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self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Careful: 18-bit position frames with wrong parity and command frames with wrong parity cannot be identified'])
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### Other
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else:
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self.put_ann(self.bits[0][0], bit_es, ann_warning, ['Error', 'Unknown command or parity error'])
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self.reset()
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return
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# Output command and parity annotations
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if (type == frame_type_16bit_pos):
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self.put_ann(type_ss, type_es, ann_type, ['16 bit Position Frame', '16 bit Pos', 'Pos', 'P'])
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if (type == frame_type_18bit_pos):
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self.put_ann(type_ss, type_es, ann_type, ['18 bit Position Frame', '18 bit Pos', 'Pos', 'P'])
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if (type == frame_type_command):
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self.put_ann(type_ss, type_es, ann_type, ['Command Frame', 'Command', 'C'])
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self.put_ann(par_ss, par_es, ann_parity, parity_status)
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# Output value
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if (type == frame_type_16bit_pos) or (type == frame_type_18bit_pos):
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pos = 0
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if (type == frame_type_16bit_pos):
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count = 15
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for ss, es, value in self.bits[3:19]:
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pos |= value << count
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count -= 1
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pos = pos if pos < 32768 else pos - 65536
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else:
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count = 17
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for ss, es, value in self.bits[3:19]:
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pos |= value << count
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count -= 1
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pos = pos if pos < 131072 else pos - 262144
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self.put_ann(type_es, par_ss, ann_pos, ['%d' % pos])
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if (type == frame_type_command):
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count = 7
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cmd = 0
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cmd_es = 0
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for ss, es, value in self.bits[3:11]:
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cmd |= value << count
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count -= 1
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cmd_es = es
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self.put_ann(type_es, cmd_es, ann_command, ['Command 0x%X' % cmd, 'Cmd 0x%X' % cmd, '0x%X' % cmd])
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count = 7
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param = 0
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for ss, es, value in self.bits[11:19]:
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param |= value << count
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count -= 1
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self.put_ann(cmd_es, par_ss, ann_parameter, ['Parameter 0x%X / %d' % (param, param), '0x%X / %d' % (param, param),'0x%X' % param])
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self.reset()
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def process_stat_bit(self, sync, bit_ss, bit_es, bit_value):
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if self.stat_skip_bit:
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self.stat_skip_bit = False
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return
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self.put_ann(bit_ss, bit_es, ann_stat_bit, ['%d' % bit_value])
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self.stat_bits.append((bit_ss, bit_es, bit_value))
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if (sync == 0) and (len(self.stat_bits) == 19):
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stat_ss = self.stat_bits[0][0]
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stat_es = self.stat_bits[18][1]
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status = 0
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count = 18
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for ss, es, value in self.stat_bits:
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status |= value << count
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count -= 1
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self.put_ann(stat_ss, stat_es, ann_status, ['Status 0x%X' % status, '0x%X' % status])
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def decode(self):
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bit_ss = None
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bit_es = None
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bit_value = 0
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stat_ss = None
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stat_es = None
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stat_value = 0
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sync_value = 0
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has_stat = self.has_channel(3)
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while True:
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# Wait for any edge on clk
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clk, sync, data, stat = self.wait({0: 'e'})
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if clk == 1:
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stat_value = stat
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bit_es = self.samplenum
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if bit_ss:
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self.process_bit(sync_value, bit_ss, bit_es, bit_value)
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bit_ss = self.samplenum
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else:
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bit_value = data
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sync_value = sync
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stat_es = self.samplenum
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if stat_ss and has_stat:
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self.process_stat_bit(sync_value, stat_ss, stat_es, stat_value)
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stat_ss = self.samplenum
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