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-rw-r--r--decoders/vpw/pd.py184
1 files changed, 0 insertions, 184 deletions
diff --git a/decoders/vpw/pd.py b/decoders/vpw/pd.py
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--- a/decoders/vpw/pd.py
+++ /dev/null
@@ -1,184 +0,0 @@
-##
-## This file is part of the libsigrokdecode project.
-##
-## Copyright (C) 2016 Anthony Symons <antus@pcmhacking.net>
-##
-## 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
-##
-
-import sigrokdecode as srd
-
-class SamplerateError(Exception):
- pass
-
-def timeuf(t):
- return int (t * 1000.0 * 1000.0)
-
-def normalize_time(t):
- if t >= 1.0:
- return '%d s' % t
- elif t >= 0.001:
- return '%d ms' % (t * 1000.0)
- elif t >= 0.000001:
- return '%d μs' % (t * 1000.0 * 1000.0)
- elif t >= 0.000000001:
- return '%d ns' % (t * 1000.0 * 1000.0 * 1000.0)
- else:
- return '%f' % t
-
-class Decoder(srd.Decoder):
- api_version = 2
- id = 'vpw'
- name = 'VPW'
- longname = 'J1850 VPW Decoder'
- desc = 'Decode J1850 VPW 1x and 4x'
- license = 'gplv2+'
- inputs = ['logic']
- outputs = ['timing']
- channels = (
- {'id': 'data', 'name': 'Data', 'desc': 'Data line'},
- )
- annotations = (
- ('time', 'Time'),
- ('raw', 'Raw'),
- ('sof', 'SOF'),
- ('ifs', 'EOF/IFS'),
- ('data', 'Data'),
- ('packet', 'Packet'),
- )
- annotation_rows = (
- ('packet', 'Packet', (5,)),
- ('byte', 'Byte', (4,)),
- ('raw', 'Raw', (1,2,3,)),
- ('time', 'Time', (0,)),
- )
-
- def __init__(self, **kwargs):
- self.state = 'IDLE'
- self.samplerate = None
- self.oldpin = None
- self.last_samplenum = None
- self.byte = 0 # the byte offset in the packet
- self.mode = 0 # for by packet decode
- self.data = 0 # the current byte
- self.datastart = 0 # sample number this byte started at
- self.csa = 0 # track the last byte seperately to retrospectively add the CS marker
- self.csb = 0
- self.count = 0 # which bit number we are up to
- self.active = 0 # which logic level is considered active
-
- # vpw timings. ideal, min and max tollerances.
- # From SAE J1850 1995 rev section 23.406
-
- self.sof = 200
- self.sofl = 164
- self.sofh = 245 # 240 by the spec, 245 so a 60us 4x sample will pass
- self.long = 128
- self.longl = 97
- self.longh = 170 # 164 by the spec but 170 for low sample rate tolerance.
- self.short = 64
- self.shortl = 24 # 35 by the spec, 24 to allow down to 6us as measured in practice for 4x @ 1mhz sampling
- self.shorth = 97
- self.ifs = 240
- self.spd = 1 # set to 4 when a 4x SOF is detected (VPW high speed frame)
-
- def handle_bit(self, b):
- self.data |= (b << 7-self.count) # MSB-first
- self.put(self.last_samplenum, self.samplenum, self.out_ann, [1, ["%d" % b]])
- if self.count == 0:
- self.datastart = self.last_samplenum
- if self.count == 7:
- self.csa = self.datastart # for CS
- self.csb = self.samplenum # for CS
- self.put(self.datastart, self.samplenum, self.out_ann, [4, ["%02X" % self.data]])
- # add protocol parsing here
- if self.byte == 0:
- self.put(self.datastart, self.samplenum, self.out_ann, [5, ['Priority','Prio','P']])
- elif self.byte == 1:
- self.put(self.datastart, self.samplenum, self.out_ann, [5, ['Destination','Dest','D']])
- elif self.byte == 2:
- self.put(self.datastart, self.samplenum, self.out_ann, [5, ['Source','Src','S']])
- elif self.byte == 3:
- self.put(self.datastart, self.samplenum, self.out_ann, [5, ['Mode','M']])
- self.mode=self.data
- elif self.mode == 1 and self.byte == 4: # mode 1 payload
- self.put(self.datastart, self.samplenum, self.out_ann, [5, ['Pid','P']])
-
- # prepare for next byte
- self.count = -1
- self.data = 0
- self.byte = self.byte + 1 # track packet offset
- self.count = self.count + 1
-
- def metadata(self, key, value):
- if key == srd.SRD_CONF_SAMPLERATE:
- self.samplerate = value
-
- def start(self):
- self.out_ann = self.register(srd.OUTPUT_ANN)
-
- def decode(self, ss, es, data):
- if not self.samplerate:
- raise SamplerateError('Cannot decode without samplerate.')
-
- for (self.samplenum, (pin,)) in data:
- # Ignore identical samples early on (for performance reasons).
- if self.oldpin == pin:
- continue
-
- if self.oldpin is None:
- self.oldpin = pin
- self.last_samplenum = self.samplenum
- continue
-
- if self.oldpin != pin:
- samples = self.samplenum - self.last_samplenum
- txt=normalize_time(samples / self.samplerate)
- self.put(self.last_samplenum, self.samplenum, self.out_ann, [0, [txt]])
- t=timeuf(samples / self.samplerate)
- if self.state == 'IDLE': # detect and set speed from the size of sof
- if pin==self.active and t in range(self.sofl , self.sofh):
- self.put(self.last_samplenum, self.samplenum, self.out_ann, [1, ['1X SOF', 'S1', 'S']])
- self.spd = 1
- self.data = 0
- self.count = 0
- self.state = 'DATA'
- elif pin==self.active and t in range(int(self.sofl/4) , int(self.sofh/4)):
- self.put(self.last_samplenum, self.samplenum, self.out_ann, [1, ['4X SOF', 'S4', '4']])
- self.spd = 4
- self.data = 0
- self.count = 0
- self.state = 'DATA'
-
- elif self.state == 'DATA':
- if t >= int(self.ifs/self.spd):
- self.state = 'IDLE'
- self.put(self.last_samplenum, self.samplenum, self.out_ann, [1, ["EOF/IFS", "E"]]) # EOF=239-280 IFS=281+
- self.put(self.csa, self.csb, self.out_ann, [5, ['Checksum','CS','C']]) # retrospective print of CS
- self.byte = 0 # reset packet offset
- elif t in range(int(self.shortl/self.spd), int(self.shorth/self.spd)):
- if pin==self.active:
- self.handle_bit(1)
- else:
- self.handle_bit(0)
- elif t in range(int(self.longl/self.spd), int(self.longh/self.spd)):
- if pin==self.active:
- self.handle_bit(0)
- else:
- self.handle_bit(1)
-
- # Store data for next round.
- self.last_samplenum = self.samplenum
- self.oldpin = pin
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