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': 'mosi', 'name': 'MOSI',
36 'desc': 'SPI MOSI line (Master out, slave in)'},
37 {'id': 'sck', 'name': 'CLK', 'desc': 'SPI clock line'},
48 self.bytesreceived = 0
50 def start(self, metadata):
51 # self.out_proto = self.add(srd.OUTPUT_PROTO, 'spi')
52 self.out_ann = self.add(srd.OUTPUT_ANN, 'spi')
55 return 'SPI: %d bytes received' % self.bytesreceived
57 def decode(self, ss, es, data):
58 # HACK! At the moment the number of probes is not handled correctly.
59 # E.g. if an input file (-i foo.sr) has more than two probes enabled.
60 # for (samplenum, (mosi, sck, x, y, z, a)) in data:
61 # for (samplenum, (cs, miso, sck, mosi, wp, hold)) in data:
62 for (samplenum, (cs, miso, sck, mosi, wp, hold)) in data:
64 # Sample data on rising SCK edges.
65 if sck == self.oldsck:
71 # If this is the first bit, save timestamp.
72 if self.bitcount == 0:
75 # Receive bit into our shift register.
77 self.mosidata |= 1 << (7 - self.bitcount)
81 # Continue to receive if not a byte yet.
82 if self.bitcount != 8:
85 # self.put(0, 0, self.out_proto, out_proto) # TODO
86 self.put(0, 0, self.out_ann, [0, ['0x%02x' % self.mosidata]])
88 # Reset decoder state.
92 # Keep stats for summary.
93 self.bytesreceived += 1