projects / libsigrokdecode.git / blame
| Commit | Line | Data |
|---|---|---|
| a81787f6 IJ |
1 | ## |
| 2 | ## This file is part of the sigrok project. | |
| 3 | ## | |
| 4 | ## Copyright (C) 2012 Iztok Jeras <iztok.jeras@gmail.com> | |
| 5 | ## | |
| 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. | |
| 10 | ## | |
| 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. | |
| 15 | ## | |
| 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 | |
| 19 | ## | |
| 20 | ||
| 21 | # 1-Wire protocol decoder | |
| 22 | ||
| 23 | import sigrokdecode as srd | |
| 24 | ||
| 4633e258 | 25 | # a dictionary of FUNCTION commands and their names |
| a81787f6 IJ |
26 | command = {0x44: "TEMPERATURE CONVERSION", |
| 27 | 0xbe: "READ SCRATCHPAD"} | |
| 28 | ||
| 29 | class Decoder(srd.Decoder): | |
| 30 | api_version = 1 | |
| 31 | id = 'onewire_transport' | |
| 32 | name = '1-Wire transport layer' | |
| 33 | longname = '1-Wire serial communication bus' | |
| 34 | desc = 'Bidirectional, half-duplex, asynchronous serial bus.' | |
| 35 | license = 'gplv2+' | |
| 36 | inputs = ['onewire_network'] | |
| 37 | outputs = [] | |
| 38 | probes = [] | |
| 39 | optional_probes = [] | |
| 40 | options = {} | |
| 41 | annotations = [ | |
| 42 | ['Transport', 'Transport layer events'], | |
| 43 | ] | |
| 44 | ||
| 45 | def __init__(self, **kwargs): | |
| 46 | # Event timing variables | |
| 47 | self.trn_beg = 0 | |
| 48 | self.trn_end = 0 | |
| 49 | # Transport layer variables | |
| 50 | self.state = 'ROM' | |
| 51 | self.rom = 0x0000000000000000 | |
| 52 | ||
| 53 | def start(self, metadata): | |
| 54 | self.out_ann = self.add(srd.OUTPUT_ANN , 'onewire_transport') | |
| 55 | ||
| 56 | def report(self): | |
| 57 | pass | |
| 58 | ||
| 59 | def decode(self, ss, es, data): | |
| 60 | [code, val] = data | |
| 61 | ||
| 62 | # State machine. | |
| 63 | if (code == "RESET/PRESENCE"): | |
| 64 | self.put(ss, es, self.out_ann, [0, ['RESET/PRESENCE: %s' % ('True' if val else 'False')]]) | |
| 65 | self.state = "ROM" | |
| 66 | elif (code == "ROM"): | |
| 67 | self.rom = val | |
| 68 | self.put(ss, es, self.out_ann, [0, ['ROM: 0x%016x' % (val)]]) | |
| 69 | self.state = "COMMAND" | |
| 70 | elif (code == "DATA"): | |
| 71 | if (self.state == "COMMAND"): | |
| 72 | if (val in command): | |
| 73 | self.put(ss, es, self.out_ann, [0, ['FUNCTION COMMAND: 0x%02x \'%s\'' % (val, command[val])]]) | |
| 74 | self.state = command[val] | |
| 75 | else: | |
| 76 | self.put(ss, es, self.out_ann, [0, ['FUNCTION COMMAND: 0x%02x \'%s\'' % (val, 'UNRECOGNIZED')]]) | |
| 77 | self.state = "UNRECOGNIZED" | |
| 78 | elif (self.state == "READ SCRATCHPAD"): | |
| 79 | self.put(ss, es, self.out_ann, [0, ['SCRATCHPAD DATA: 0x%02x' % (val)]]) | |
| 80 | elif (self.state == "TEMPERATURE CONVERSION"): | |
| 81 | self.put(ss, es, self.out_ann, [0, ['TEMPERATURE CONVERSION STATUS: 0x%02x' % (val)]]) | |
| 82 | elif (self.state == "UNRECOGNIZED"): | |
| 83 | self.put(ss, es, self.out_ann, [0, ['UNRECOGNIZED: 0x%02x' % (val)]]) | |
| 84 | else: | |
| 85 | raise Exception('Invalid state: %s' % self.state) |