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1 | ## | |
2 | ## This file is part of the sigrok project. | |
3 | ## | |
4 | ## Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de> | |
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 | ||
25 | # Annotation feed formats | |
26 | ANN_LINK = 0 | |
27 | ANN_NETWORK = 1 | |
28 | ANN_TRANSPORT = 2 | |
29 | ||
30 | class Decoder(srd.Decoder): | |
31 | api_version = 1 | |
32 | id = 'onewire' | |
33 | name = '1-Wire' | |
34 | longname = '' | |
35 | desc = '1-Wire bus and MicroLan' | |
36 | license = 'gplv2+' | |
37 | inputs = ['logic'] | |
38 | outputs = ['onewire'] | |
39 | probes = [ | |
40 | {'id': 'owr', 'name': 'OWR', 'desc': '1-Wire bus'}, | |
41 | ] | |
42 | optional_probes = [ | |
43 | {'id': 'pwr', 'name': 'PWR', 'desc': '1-Wire power'}, | |
44 | ] | |
45 | options = { | |
46 | 'overdrive' : ['Overdrive', 1], | |
47 | 'cnt_normal_bit' : ['Time (in samplerate periods) for normal mode sample bit' , 0], | |
48 | 'cnt_normal_presence' : ['Time (in samplerate periods) for normal mode sample presence', 0], | |
49 | 'cnt_overdrive_bit' : ['Time (in samplerate periods) for overdrive mode sample bit' , 0], | |
50 | 'cnt_overdrive_presence': ['Time (in samplerate periods) for overdrive mode sample presence', 0], | |
51 | } | |
52 | annotations = [ | |
53 | ['Link', 'Link layer events (reset, presence, bit slots)'], | |
54 | ['Network', 'Network layer events (device addressing)'], | |
55 | ['Transport', 'Transport layer events'], | |
56 | ] | |
57 | ||
58 | def __init__(self, **kwargs): | |
59 | # Common variables | |
60 | self.samplenum = 0 | |
61 | # Link layer variables | |
62 | self.lnk_state = 'WAIT FOR FALLING EDGE' | |
63 | self.lnk_event = 'NONE' | |
64 | self.lnk_fall = 0 | |
65 | self.lnk_present = 0 | |
66 | self.lnk_bit = 0 | |
67 | # Network layer variables | |
68 | self.net_state = 'IDLE' | |
69 | self.net_cnt = 0 | |
70 | self.net_search = "P" | |
71 | self.net_data_p = 0x0 | |
72 | self.net_data_n = 0x0 | |
73 | self.net_data = 0x0 | |
74 | self.net_rom = 0x0000000000000000 | |
75 | ||
76 | def start(self, metadata): | |
77 | self.out_proto = self.add(srd.OUTPUT_PROTO, 'onewire') | |
78 | self.out_ann = self.add(srd.OUTPUT_ANN , 'onewire') | |
79 | ||
80 | # check if samplerate is appropriate | |
81 | self.samplerate = metadata['samplerate'] | |
82 | if (self.options['overdrive']): | |
83 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['NOTE: Sample rate checks assume overdrive mode.']]) | |
84 | if (self.samplerate < 2000000): | |
85 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['ERROR: Sampling rate is too low must be above 2MHz for proper overdrive mode decoding.']]) | |
86 | elif (self.samplerate < 5000000): | |
87 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['WARNING: Sampling rate is suggested to be above 5MHz for proper overdrive mode decoding.']]) | |
88 | else: | |
89 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['NOTE: Sample rate checks assume normal mode only.']]) | |
90 | if (self.samplerate < 400000): | |
91 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['ERROR: Sampling rate is too low must be above 400kHz for proper normal mode decoding.']]) | |
92 | elif (self.samplerate < 1000000): | |
93 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['WARNING: Sampling rate is suggested to be above 1MHz for proper normal mode decoding.']]) | |
94 | ||
95 | # The default 1-Wire time base is 30us, this is used to calculate sampling times. | |
96 | if (self.options['cnt_normal_bit']): self.cnt_normal_bit = self.options['cnt_normal_bit'] | |
97 | else: self.cnt_normal_bit = float(self.samplerate) * 0.000015 # 15ns | |
98 | if (self.options['cnt_normal_presence']): self.cnt_normal_presence = self.options['cnt_normal_presence'] | |
99 | else: self.cnt_normal_presence = float(self.samplerate) * 0.000075 # 15ns | |
100 | if (self.options['cnt_overdrive_bit']): self.cnt_overdrive_bit = self.options['cnt_overdrive_bit'] | |
101 | else: self.cnt_overdrive_bit = float(self.samplerate) * 0.000002 # 2ns | |
102 | if (self.options['cnt_overdrive_presence']): self.cnt_overdrive_presence = self.options['cnt_overdrive_presence'] | |
103 | else: self.cnt_overdrive_presence = float(self.samplerate) * 0.000010 # 10ns | |
104 | # Check if sample times are in the allowed range | |
105 | # TODO | |
106 | self.time_base = float(self.samplerate) * float(0.000030) | |
107 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['time_base = %d' % self.time_base]]) | |
108 | ||
109 | def report(self): | |
110 | pass | |
111 | ||
112 | def decode(self, ss, es, data): | |
113 | for (self.samplenum, (owr, pwr)) in data: | |
114 | ||
115 | # Data link layer | |
116 | ||
117 | # Clear events. | |
118 | self.lnk_event = "NONE" | |
119 | # State machine. | |
120 | if self.lnk_state == 'WAIT FOR FALLING EDGE': | |
121 | # The start of a cycle is a falling edge. | |
122 | if (owr == 0): | |
123 | # Save the sample number for the falling edge. | |
124 | self.lnk_fall = self.samplenum | |
125 | # Go to waiting for sample time | |
126 | self.lnk_state = 'WAIT FOR DATA SAMPLE' | |
127 | elif self.lnk_state == 'WAIT FOR DATA SAMPLE': | |
128 | # Data should be sample one 'time unit' after a falling edge | |
129 | if (self.samplenum - self.lnk_fall == 0.5*self.time_base): | |
130 | self.lnk_bit = owr & 0x1 | |
131 | self.lnk_event = "DATA BIT" | |
132 | if (self.lnk_bit) : self.lnk_state = 'WAIT FOR FALLING EDGE' | |
133 | else : self.lnk_state = 'WAIT FOR RISING EDGE' | |
134 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['BIT: %01x' % self.lnk_bit]]) | |
135 | elif self.lnk_state == 'WAIT FOR RISING EDGE': | |
136 | # The end of a cycle is a rising edge. | |
137 | if (owr == 1): | |
138 | # A reset cycle is longer than 8T. | |
139 | if (self.samplenum - self.lnk_fall > 8*self.time_base): | |
140 | # Save the sample number for the falling edge. | |
141 | self.lnk_rise = self.samplenum | |
142 | # Send a reset event to the next protocol layer. | |
143 | self.lnk_event = "RESET" | |
144 | self.lnk_state = "WAIT FOR PRESENCE DETECT" | |
145 | self.put(self.lnk_fall, self.samplenum, self.out_proto, ['RESET']) | |
146 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK , ['RESET']]) | |
147 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['RESET']]) | |
148 | # Reset the timer. | |
149 | self.lnk_fall = self.samplenum | |
150 | # Otherwise this is assumed to be a data bit. | |
151 | else : | |
152 | self.lnk_state = "WAIT FOR FALLING EDGE" | |
153 | elif self.lnk_state == 'WAIT FOR PRESENCE DETECT': | |
154 | # Data should be sample one 'time unit' after a falling edge | |
155 | if (self.samplenum - self.lnk_rise == 2.5*self.time_base): | |
156 | self.lnk_present = owr & 0x1 | |
157 | # Save the sample number for the falling edge. | |
158 | if not (self.lnk_present) : self.lnk_fall = self.samplenum | |
159 | # create presence detect event | |
160 | #self.lnk_event = "PRESENCE DETECT" | |
161 | if (self.lnk_present) : self.lnk_state = 'WAIT FOR FALLING EDGE' | |
162 | else : self.lnk_state = 'WAIT FOR RISING EDGE' | |
163 | present_str = "False" if self.lnk_present else "True" | |
164 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK , ['PRESENCE: ' + present_str]]) | |
165 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['PRESENCE: ' + present_str]]) | |
166 | else: | |
167 | raise Exception('Invalid lnk_state: %d' % self.lnk_state) | |
168 | ||
169 | # Network layer | |
170 | ||
171 | # State machine. | |
172 | if (self.lnk_event == "RESET"): | |
173 | self.net_state = "COMMAND" | |
174 | self.net_search = "P" | |
175 | self.net_cnt = 0 | |
176 | elif (self.net_state == "IDLE"): | |
177 | pass | |
178 | elif (self.net_state == "TRANSPORT"): | |
179 | if (self.collect_data(8)): | |
180 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TRANSPORT: 0x%02x' % self.net_data]]) | |
181 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT: 0x%02x' % self.net_data]]) | |
182 | self.put(self.lnk_fall, self.samplenum, self.out_proto, ['transfer', self.net_data]) | |
183 | elif (self.net_state == "COMMAND"): | |
184 | if (self.collect_data(8)): | |
185 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: 0x%02x' % self.net_data]]) | |
186 | if (self.net_data == 0x33): | |
187 | # READ ROM | |
188 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'READ ROM\'']]) | |
189 | self.net_state = "GET ROM" | |
190 | elif (self.net_data == 0x0f): | |
191 | # CONDITIONAL READ ROM | |
192 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'CONDITIONAL READ ROM\'']]) | |
193 | self.net_state = "GET ROM" | |
194 | elif (self.net_data == 0xcc): | |
195 | # SKIP ROM | |
196 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'SKIP ROM\'']]) | |
197 | self.net_state = "TRANSPORT" | |
198 | elif (self.net_data == 0x55): | |
199 | # MATCH ROM | |
200 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'MATCH ROM\'']]) | |
201 | self.net_state = "GET ROM" | |
202 | elif (self.net_data == 0xf0): | |
203 | # SEARCH ROM | |
204 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'SEARCH ROM\'']]) | |
205 | self.net_state = "SEARCH ROM" | |
206 | elif (self.net_data == 0xec): | |
207 | # CONDITIONAL SEARCH ROM | |
208 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'CONDITIONAL SEARCH ROM\'']]) | |
209 | self.net_state = "SEARCH ROM" | |
210 | elif (self.net_data == 0x3c): | |
211 | # OVERDRIVE SKIP ROM | |
212 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'OVERDRIVE SKIP ROM\'']]) | |
213 | self.net_state = "TRANSPORT" | |
214 | elif (self.net_data == 0x69): | |
215 | # OVERDRIVE MATCH ROM | |
216 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'OVERDRIVE MATCH ROM\'']]) | |
217 | self.net_state = "GET ROM" | |
218 | elif (self.net_state == "GET ROM"): | |
219 | # family code (1B) + serial number (6B) + CRC (1B) | |
220 | if (self.collect_data(64)): | |
221 | self.net_rom = self.net_data & 0xffffffffffffffff | |
222 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM: 0x%016x' % self.net_rom]]) | |
223 | self.net_state = "TRANSPORT" | |
224 | elif (self.net_state == "SEARCH ROM"): | |
225 | # family code (1B) + serial number (6B) + CRC (1B) | |
226 | if (self.collect_search(64)): | |
227 | self.net_rom = self.net_data & 0xffffffffffffffff | |
228 | self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM: 0x%016x' % self.net_rom]]) | |
229 | self.net_state = "TRANSPORT" | |
230 | else: | |
231 | raise Exception('Invalid net_state: %s' % self.net_state) | |
232 | ||
233 | ||
234 | # Link/Network layer data collector | |
235 | def collect_data (self, length): | |
236 | if (self.lnk_event == "DATA BIT"): | |
237 | #print ("DEBUG: BIT=%d t0=%d t+=%d" % (self.lnk_bit, self.lnk_fall, self.samplenum)) | |
238 | self.net_data = self.net_data & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt) | |
239 | self.net_cnt = self.net_cnt + 1 | |
240 | if (self.net_cnt == length): | |
241 | self.net_data = self.net_data & ((1<<length)-1) | |
242 | self.net_cnt = 0 | |
243 | return (1) | |
244 | else: | |
245 | return (0) | |
246 | else: | |
247 | return (0) | |
248 | ||
249 | # Link/Network layer search collector | |
250 | def collect_search (self, length): | |
251 | if (self.lnk_event == "DATA BIT"): | |
252 | #print ("DEBUG: SEARCH=%s BIT=%d t0=%d t+=%d" % (self.net_search, self.lnk_bit, self.lnk_fall, self.samplenum)) | |
253 | if (self.net_search == "P"): | |
254 | self.net_data_p = self.net_data_p & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt) | |
255 | self.net_search = "N" | |
256 | elif (self.net_search == "N"): | |
257 | self.net_data_n = self.net_data_n & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt) | |
258 | self.net_search = "D" | |
259 | elif (self.net_search == "D"): | |
260 | self.net_data = self.net_data & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt) | |
261 | self.net_search = "P" | |
262 | self.net_cnt = self.net_cnt + 1 | |
263 | if (self.net_cnt == length): | |
264 | self.net_data_p = self.net_data_p & ((1<<length)-1) | |
265 | self.net_data_n = self.net_data_n & ((1<<length)-1) | |
266 | self.net_data = self.net_data & ((1<<length)-1) | |
267 | self.net_search = "P" | |
268 | self.net_cnt = 0 | |
269 | return (1) | |
270 | else: | |
271 | return (0) | |
272 | else: | |
273 | return (0) | |
274 | ||
275 | ||
276 | # # Transport layer | |
277 | # | |
278 | # # State machine. | |
279 | # if (self.lnk_event == "RESET"): | |
280 | # self.trn_state = "IDLE" | |
281 | # elif (self.trn_state == "IDLE"): | |
282 | # pass | |
283 | # elif (self.trn_state == "COMMAND"): | |
284 | # if (self.collect_data(8)): | |
285 | ## self.put(self.lnk_fall, self.samplenum, self.out_proto, ['FUNCTION COMMAND', self.net_data]) | |
286 | # self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['FUNCTION COMMAND: 0x%02x' % self.net_data]]) | |
287 | # self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['FUNCTION COMMAND: 0x%02x' % self.net_data]]) | |
288 | # if (self.net_data == 0x48): | |
289 | # # COPY SCRATCHPAD | |
290 | # self.trn_state = "TODO" | |
291 | # elif (self.net_data == 0x4e): | |
292 | # # WRITE SCRATCHPAD | |
293 | # self.trn_state = "TODO" | |
294 | # elif (self.net_data == 0xbe): | |
295 | # # READ SCRATCHPAD | |
296 | # self.trn_state = "TODO" | |
297 | # elif (self.net_data == 0xb8): | |
298 | # # RECALL E2 | |
299 | # self.trn_state = "TODO" | |
300 | # elif (self.net_data == 0xb4): | |
301 | # # READ POWER SUPPLY | |
302 | # self.trn_state = "TODO" | |
303 | # else: | |
304 | # # unsupported commands | |
305 | # self.trn_state = "TODO" | |
306 | # elif (self.trn_state == "TODO"): | |
307 | # if (self.collect_data(8)): | |
308 | # self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TRANSPORT DATA: 0x%02x' % self.net_data]]) | |
309 | # self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT DATA: 0x%02x' % self.net_data]]) | |
310 | ## self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TODO unsupported transport state: %s' % self.trn_state]]) | |
311 | ## self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TODO unsupported transport state: %s' % self.trn_state]]) | |
312 | # pass | |
313 | # else: | |
314 | # raise Exception('Invalid trn_state: %s' % self.trn_state) | |
315 | ||
316 | ||
317 | #class onewire_device (): | |
318 | # def __init__ (self, scratchpad_size = 8): | |
319 | # pass | |
320 | # def reset (self): | |
321 | # pass | |
322 | # def data (self, data): | |
323 | # self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TRANSPORT DATA: 0x%02x' % self.net_data]]) | |
324 | # self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT DATA: 0x%02x' % self.net_data]]) |