2 ## This file is part of the sigrok project.
4 ## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 2 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, write to the Free Software
18 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 def __init__(self, data):
26 def probe(self, probe):
27 s = ord(self.data[probe / 8]) & (1 << (probe % 8))
28 return True if s else False
30 def sampleiter(data, unitsize):
31 for i in range(0, len(data), unitsize):
32 yield(Sample(data[i:i+unitsize]))
38 longname = 'Serial Peripheral Interface (SPI) bus'
39 longdesc = '...longdesc...'
40 author = 'Gareth McMullin'
41 email = 'gareth@blacksphere.co.nz'
45 # Probe names with a set of defaults
46 probes = {'sdata':0, 'sck':1}
50 self.probes = Decoder.probes.copy()
54 self.bytesreceived = 0
56 def start(self, metadata):
57 self.unitsize = metadata['unitsize']
60 return 'SPI: %d bytes received' % self.bytesreceived
62 def decode(self, data):
63 # We should accept a list of samples and iterate...
64 for sample in sampleiter(data['data'], self.unitsize):
66 sck = sample.probe(self.probes['sck'])
67 # Sample SDATA on rising SCK
68 if sck == self.oldsck:
74 # If this is first bit, save timestamp
76 self.time = data['time']
77 # Receive bit into our shift register
78 sdata = sample.probe(self.probes['sdata'])
80 self.rxdata |= 1 << (7 - self.rxcount)
82 # Continue to receive if not a byte yet
85 # Received a byte, pass up to sigrok
86 outdata = {'time':self.time,
87 'duration':data['time'] + data['duration'] - self.time,
89 'display':('%02X' % self.rxdata),
96 # Keep stats for summary
97 self.bytesreceived += 1
99 sigrok.register(Decoder)