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
21 import sigrokdecode as srd
23 class Decoder(srd.Decoder):
26 longname = 'Serial Peripheral Interface (SPI) bus'
28 longdesc = '...longdesc...'
29 author = 'Gareth McMullin'
30 email = 'gareth@blacksphere.co.nz'
35 {'id': 'sdata', 'name': 'DATA', 'desc': 'SPI data line (MISO or MOSI)'},
36 {'id': 'sck', 'name': 'CLK', 'desc': 'SPI clock line'},
45 self.bytesreceived = 0
47 def start(self, metadata):
48 # self.out_proto = self.add(srd.OUTPUT_PROTO, 'spi')
49 self.out_ann = self.add(srd.OUTPUT_ANN, 'spi')
52 return 'SPI: %d bytes received' % self.bytesreceived
54 def decode(self, timeoffset, duration, data):
55 # HACK! At the moment the number of probes is not handled correctly.
56 # E.g. if an input file (-i foo.sr) has more than two probes enabled.
57 for (samplenum, (sdata, sck, x, y, z, a)) in data:
59 # Sample SDATA on rising SCK
60 if sck == self.oldsck:
66 # If this is first bit, save timestamp
68 self.time = timeoffset # FIXME
69 # Receive bit into our shift register
71 self.rxdata |= 1 << (7 - self.rxcount)
73 # Continue to receive if not a byte yet
76 # Received a byte, pass up to sigrok
77 outdata = {'time':self.time,
78 'duration':timeoffset + duration - self.time,
80 'display':('%02X' % self.rxdata),
83 # self.put(0, 0, self.out_proto, out_proto)
84 self.put(0, 0, self.out_ann, outdata)
88 # Keep stats for summary
89 self.bytesreceived += 1