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6eb87578 GM |
1 | ## |
2 | ## This file is part of the sigrok project. | |
3 | ## | |
4 | ## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz> | |
d6bace96 | 5 | ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> |
6eb87578 GM |
6 | ## |
7 | ## This program is free software; you can redistribute it and/or modify | |
8 | ## it under the terms of the GNU General Public License as published by | |
9 | ## the Free Software Foundation; either version 2 of the License, or | |
10 | ## (at your option) any later version. | |
11 | ## | |
12 | ## This program is distributed in the hope that it will be useful, | |
13 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ## GNU General Public License for more details. | |
16 | ## | |
17 | ## You should have received a copy of the GNU General Public License | |
18 | ## along with this program; if not, write to the Free Software | |
19 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | ## | |
ad2dc0de | 21 | |
677d597b | 22 | import sigrokdecode as srd |
67e847fd | 23 | |
d6bace96 UH |
24 | # Annotation formats |
25 | ANN_HEX = 0 | |
26 | ||
677d597b | 27 | class Decoder(srd.Decoder): |
67e847fd | 28 | id = 'spi' |
2b7d0e2b | 29 | name = 'SPI' |
2b7d0e2b | 30 | longname = 'Serial Peripheral Interface (SPI) bus' |
9a12a6e7 | 31 | desc = '...desc...' |
6eb87578 GM |
32 | longdesc = '...longdesc...' |
33 | author = 'Gareth McMullin' | |
34 | email = 'gareth@blacksphere.co.nz' | |
35 | license = 'gplv2+' | |
36 | inputs = ['logic'] | |
37 | outputs = ['spi'] | |
6b5b91d2 | 38 | probes = [ |
de9cee24 UH |
39 | {'id': 'mosi', 'name': 'MOSI', |
40 | 'desc': 'SPI MOSI line (Master out, slave in)'}, | |
4e570fa9 UH |
41 | {'id': 'miso', 'name': 'MISO', |
42 | 'desc': 'SPI MISO line (Master in, slave out)'}, | |
6b5b91d2 | 43 | {'id': 'sck', 'name': 'CLK', 'desc': 'SPI clock line'}, |
4e570fa9 | 44 | {'id': 'cs', 'name': 'CS#', 'desc': 'SPI CS (chip select) line'}, |
6b5b91d2 | 45 | ] |
6eb87578 | 46 | options = {} |
b1bb5eed | 47 | annotations = [ |
d6bace96 | 48 | ['Hex', 'SPI data bytes in hex format'], |
b1bb5eed | 49 | ] |
6eb87578 | 50 | |
3643fc3f | 51 | def __init__(self): |
c66baa8c | 52 | self.oldsck = 1 |
a10bfc48 | 53 | self.bitcount = 0 |
4917bb31 | 54 | self.mosidata = 0 |
d6bace96 | 55 | self.misodata = 0 |
6eb87578 | 56 | self.bytesreceived = 0 |
d6bace96 | 57 | self.samplenum = -1 |
6eb87578 | 58 | |
3643fc3f | 59 | def start(self, metadata): |
d6bace96 | 60 | self.out_proto = self.add(srd.OUTPUT_PROTO, 'spi') |
56202222 | 61 | self.out_ann = self.add(srd.OUTPUT_ANN, 'spi') |
3643fc3f | 62 | |
6eb87578 | 63 | def report(self): |
e100d51e | 64 | return 'SPI: %d bytes received' % self.bytesreceived |
6eb87578 | 65 | |
2b9837d9 | 66 | def decode(self, ss, es, data): |
6b5b91d2 UH |
67 | # HACK! At the moment the number of probes is not handled correctly. |
68 | # E.g. if an input file (-i foo.sr) has more than two probes enabled. | |
de9cee24 | 69 | # for (samplenum, (mosi, sck, x, y, z, a)) in data: |
b1bb5eed | 70 | # for (samplenum, (cs, miso, sck, mosi, wp, hold)) in data: |
de9cee24 | 71 | for (samplenum, (cs, miso, sck, mosi, wp, hold)) in data: |
6eb87578 | 72 | |
d6bace96 UH |
73 | self.samplenum += 1 # FIXME |
74 | ||
de9cee24 | 75 | # Sample data on rising SCK edges. |
6eb87578 GM |
76 | if sck == self.oldsck: |
77 | continue | |
78 | self.oldsck = sck | |
b1bb5eed | 79 | if sck == 0: |
ad2dc0de | 80 | continue |
6eb87578 | 81 | |
d6bace96 | 82 | # If this is the first bit, save its sample number. |
a10bfc48 | 83 | if self.bitcount == 0: |
d6bace96 | 84 | self.start_sample = samplenum |
b1bb5eed UH |
85 | |
86 | # Receive bit into our shift register. | |
de9cee24 | 87 | if mosi == 1: |
4917bb31 | 88 | self.mosidata |= 1 << (7 - self.bitcount) |
d6bace96 UH |
89 | if miso == 1: |
90 | self.misodata |= 1 << (7 - self.bitcount) | |
b1bb5eed | 91 | |
a10bfc48 | 92 | self.bitcount += 1 |
b1bb5eed UH |
93 | |
94 | # Continue to receive if not a byte yet. | |
a10bfc48 | 95 | if self.bitcount != 8: |
6eb87578 | 96 | continue |
b1bb5eed | 97 | |
d6bace96 UH |
98 | self.put(self.start_sample, self.samplenum, self.out_proto, |
99 | ['data', self.mosidata, self.misodata]) | |
100 | self.put(self.start_sample, self.samplenum, self.out_ann, | |
101 | [ANN_HEX, ['MOSI: 0x%02x, MISO: 0x%02x' % (self.mosidata, | |
102 | self.misodata)]]) | |
b1bb5eed UH |
103 | |
104 | # Reset decoder state. | |
4917bb31 | 105 | self.mosidata = 0 |
d6bace96 | 106 | self.misodata = 0 |
a10bfc48 | 107 | self.bitcount = 0 |
b1bb5eed UH |
108 | |
109 | # Keep stats for summary. | |
6eb87578 | 110 | self.bytesreceived += 1 |
ad2dc0de | 111 |