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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2012-2015 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 | import sigrokdecode as srd | |
22 | ||
23 | ''' | |
24 | OUTPUT_PYTHON format: | |
25 | ||
26 | Packet: | |
27 | [<ptype>, <pdata>] | |
28 | ||
29 | <ptype>: | |
30 | - 'NEW STATE': <pdata> is the new state of the JTAG state machine. | |
31 | Valid values: 'TEST-LOGIC-RESET', 'RUN-TEST/IDLE', 'SELECT-DR-SCAN', | |
32 | 'CAPTURE-DR', 'SHIFT-DR', 'EXIT1-DR', 'PAUSE-DR', 'EXIT2-DR', 'UPDATE-DR', | |
33 | 'SELECT-IR-SCAN', 'CAPTURE-IR', 'SHIFT-IR', 'EXIT1-IR', 'PAUSE-IR', | |
34 | 'EXIT2-IR', 'UPDATE-IR'. | |
35 | - 'IR TDI': Bitstring that was clocked into the IR register. | |
36 | - 'IR TDO': Bitstring that was clocked out of the IR register. | |
37 | - 'DR TDI': Bitstring that was clocked into the DR register. | |
38 | - 'DR TDO': Bitstring that was clocked out of the DR register. | |
39 | ||
40 | All bitstrings are a list consisting of two items. The first is a sequence | |
41 | of '1' and '0' characters (the right-most character is the LSB. Example: | |
42 | '01110001', where 1 is the LSB). The second item is a list of ss/es values | |
43 | for each bit that is in the bitstring. | |
44 | ''' | |
45 | ||
46 | jtag_states = [ | |
47 | # Intro "tree" | |
48 | 'TEST-LOGIC-RESET', 'RUN-TEST/IDLE', | |
49 | # DR "tree" | |
50 | 'SELECT-DR-SCAN', 'CAPTURE-DR', 'UPDATE-DR', 'PAUSE-DR', | |
51 | 'SHIFT-DR', 'EXIT1-DR', 'EXIT2-DR', | |
52 | # IR "tree" | |
53 | 'SELECT-IR-SCAN', 'CAPTURE-IR', 'UPDATE-IR', 'PAUSE-IR', | |
54 | 'SHIFT-IR', 'EXIT1-IR', 'EXIT2-IR', | |
55 | ] | |
56 | ||
57 | class Decoder(srd.Decoder): | |
58 | api_version = 2 | |
59 | id = 'jtag' | |
60 | name = 'JTAG' | |
61 | longname = 'Joint Test Action Group (IEEE 1149.1)' | |
62 | desc = 'Protocol for testing, debugging, and flashing ICs.' | |
63 | license = 'gplv2+' | |
64 | inputs = ['logic'] | |
65 | outputs = ['jtag'] | |
66 | channels = ( | |
67 | {'id': 'tdi', 'name': 'TDI', 'desc': 'Test data input'}, | |
68 | {'id': 'tdo', 'name': 'TDO', 'desc': 'Test data output'}, | |
69 | {'id': 'tck', 'name': 'TCK', 'desc': 'Test clock'}, | |
70 | {'id': 'tms', 'name': 'TMS', 'desc': 'Test mode select'}, | |
71 | ) | |
72 | optional_channels = ( | |
73 | {'id': 'trst', 'name': 'TRST#', 'desc': 'Test reset'}, | |
74 | {'id': 'srst', 'name': 'SRST#', 'desc': 'System reset'}, | |
75 | {'id': 'rtck', 'name': 'RTCK', 'desc': 'Return clock signal'}, | |
76 | ) | |
77 | annotations = tuple([tuple([s.lower(), s]) for s in jtag_states]) + ( \ | |
78 | ('bit-tdi', 'Bit (TDI)'), | |
79 | ('bit-tdo', 'Bit (TDO)'), | |
80 | ('bitstring-tdi', 'Bitstring (TDI)'), | |
81 | ('bitstring-tdo', 'Bitstring (TDO)'), | |
82 | ) | |
83 | annotation_rows = ( | |
84 | ('bits-tdi', 'Bits (TDI)', (16,)), | |
85 | ('bits-tdo', 'Bits (TDO)', (17,)), | |
86 | ('bitstrings-tdi', 'Bitstring (TDI)', (18,)), | |
87 | ('bitstrings-tdo', 'Bitstring (TDO)', (19,)), | |
88 | ('states', 'States', tuple(range(15 + 1))), | |
89 | ) | |
90 | ||
91 | def __init__(self, **kwargs): | |
92 | # self.state = 'TEST-LOGIC-RESET' | |
93 | self.state = 'RUN-TEST/IDLE' | |
94 | self.oldstate = None | |
95 | self.oldpins = (-1, -1, -1, -1) | |
96 | self.oldtck = -1 | |
97 | self.bits_tdi = [] | |
98 | self.bits_tdo = [] | |
99 | self.bits_samplenums_tdi = [] | |
100 | self.bits_samplenums_tdo = [] | |
101 | self.samplenum = 0 | |
102 | self.ss_item = self.es_item = None | |
103 | self.ss_bitstring = self.es_bitstring = None | |
104 | self.saved_item = None | |
105 | self.first = True | |
106 | self.first_bit = True | |
107 | ||
108 | def start(self): | |
109 | self.out_python = self.register(srd.OUTPUT_PYTHON) | |
110 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
111 | ||
112 | def putx(self, data): | |
113 | self.put(self.ss_item, self.es_item, self.out_ann, data) | |
114 | ||
115 | def putp(self, data): | |
116 | self.put(self.ss_item, self.es_item, self.out_python, data) | |
117 | ||
118 | def putx_bs(self, data): | |
119 | self.put(self.ss_bitstring, self.es_bitstring, self.out_ann, data) | |
120 | ||
121 | def putp_bs(self, data): | |
122 | self.put(self.ss_bitstring, self.es_bitstring, self.out_python, data) | |
123 | ||
124 | def advance_state_machine(self, tms): | |
125 | self.oldstate = self.state | |
126 | ||
127 | # Intro "tree" | |
128 | if self.state == 'TEST-LOGIC-RESET': | |
129 | self.state = 'TEST-LOGIC-RESET' if (tms) else 'RUN-TEST/IDLE' | |
130 | elif self.state == 'RUN-TEST/IDLE': | |
131 | self.state = 'SELECT-DR-SCAN' if (tms) else 'RUN-TEST/IDLE' | |
132 | ||
133 | # DR "tree" | |
134 | elif self.state == 'SELECT-DR-SCAN': | |
135 | self.state = 'SELECT-IR-SCAN' if (tms) else 'CAPTURE-DR' | |
136 | elif self.state == 'CAPTURE-DR': | |
137 | self.state = 'EXIT1-DR' if (tms) else 'SHIFT-DR' | |
138 | elif self.state == 'SHIFT-DR': | |
139 | self.state = 'EXIT1-DR' if (tms) else 'SHIFT-DR' | |
140 | elif self.state == 'EXIT1-DR': | |
141 | self.state = 'UPDATE-DR' if (tms) else 'PAUSE-DR' | |
142 | elif self.state == 'PAUSE-DR': | |
143 | self.state = 'EXIT2-DR' if (tms) else 'PAUSE-DR' | |
144 | elif self.state == 'EXIT2-DR': | |
145 | self.state = 'UPDATE-DR' if (tms) else 'SHIFT-DR' | |
146 | elif self.state == 'UPDATE-DR': | |
147 | self.state = 'SELECT-DR-SCAN' if (tms) else 'RUN-TEST/IDLE' | |
148 | ||
149 | # IR "tree" | |
150 | elif self.state == 'SELECT-IR-SCAN': | |
151 | self.state = 'TEST-LOGIC-RESET' if (tms) else 'CAPTURE-IR' | |
152 | elif self.state == 'CAPTURE-IR': | |
153 | self.state = 'EXIT1-IR' if (tms) else 'SHIFT-IR' | |
154 | elif self.state == 'SHIFT-IR': | |
155 | self.state = 'EXIT1-IR' if (tms) else 'SHIFT-IR' | |
156 | elif self.state == 'EXIT1-IR': | |
157 | self.state = 'UPDATE-IR' if (tms) else 'PAUSE-IR' | |
158 | elif self.state == 'PAUSE-IR': | |
159 | self.state = 'EXIT2-IR' if (tms) else 'PAUSE-IR' | |
160 | elif self.state == 'EXIT2-IR': | |
161 | self.state = 'UPDATE-IR' if (tms) else 'SHIFT-IR' | |
162 | elif self.state == 'UPDATE-IR': | |
163 | self.state = 'SELECT-DR-SCAN' if (tms) else 'RUN-TEST/IDLE' | |
164 | ||
165 | def handle_rising_tck_edge(self, tdi, tdo, tck, tms): | |
166 | # Rising TCK edges always advance the state machine. | |
167 | self.advance_state_machine(tms) | |
168 | ||
169 | if self.first: | |
170 | # Save the start sample and item for later (no output yet). | |
171 | self.ss_item = self.samplenum | |
172 | self.first = False | |
173 | else: | |
174 | # Output the saved item (from the last CLK edge to the current). | |
175 | self.es_item = self.samplenum | |
176 | # Output the old state (from last rising TCK edge to current one). | |
177 | self.putx([jtag_states.index(self.oldstate), [self.oldstate]]) | |
178 | self.putp(['NEW STATE', self.state]) | |
179 | ||
180 | # Upon SHIFT-IR/SHIFT-DR collect the current TDI/TDO values. | |
181 | if self.state.startswith('SHIFT-'): | |
182 | if self.first_bit: | |
183 | self.ss_bitstring = self.samplenum | |
184 | self.first_bit = False | |
185 | else: | |
186 | self.putx([16, [str(self.bits_tdi[0])]]) | |
187 | self.putx([17, [str(self.bits_tdo[0])]]) | |
188 | # Use self.samplenum as ES of the previous bit. | |
189 | self.bits_samplenums_tdi[0][1] = self.samplenum | |
190 | self.bits_samplenums_tdo[0][1] = self.samplenum | |
191 | ||
192 | self.bits_tdi.insert(0, tdi) | |
193 | self.bits_tdo.insert(0, tdo) | |
194 | ||
195 | # Use self.samplenum as SS of the current bit. | |
196 | self.bits_samplenums_tdi.insert(0, [self.samplenum, -1]) | |
197 | self.bits_samplenums_tdo.insert(0, [self.samplenum, -1]) | |
198 | ||
199 | # Output all TDI/TDO bits if we just switched from SHIFT-* to EXIT1-*. | |
200 | if self.oldstate.startswith('SHIFT-') and \ | |
201 | self.state.startswith('EXIT1-'): | |
202 | ||
203 | self.es_bitstring = self.samplenum | |
204 | ||
205 | t = self.state[-2:] + ' TDI' | |
206 | b = ''.join(map(str, self.bits_tdi)) | |
207 | h = ' (0x%x' % int('0b' + b, 2) + ')' | |
208 | s = t + ': ' + b + h + ', ' + str(len(self.bits_tdi)) + ' bits' | |
209 | self.putx_bs([18, [s]]) | |
210 | self.bits_samplenums_tdi[0][1] = self.samplenum # ES of last bit. | |
211 | self.putp_bs([t, [b, self.bits_samplenums_tdi]]) | |
212 | self.putx([16, [str(self.bits_tdi[0])]]) # Last bit. | |
213 | self.bits_tdi = [] | |
214 | self.bits_samplenums_tdi = [] | |
215 | ||
216 | t = self.state[-2:] + ' TDO' | |
217 | b = ''.join(map(str, self.bits_tdo)) | |
218 | h = ' (0x%x' % int('0b' + b, 2) + ')' | |
219 | s = t + ': ' + b + h + ', ' + str(len(self.bits_tdo)) + ' bits' | |
220 | self.putx_bs([19, [s]]) | |
221 | self.bits_samplenums_tdo[0][1] = self.samplenum # ES of last bit. | |
222 | self.putp_bs([t, [b, self.bits_samplenums_tdo]]) | |
223 | self.putx([17, [str(self.bits_tdo[0])]]) # Last bit. | |
224 | self.bits_tdo = [] | |
225 | self.bits_samplenums_tdo = [] | |
226 | ||
227 | self.first_bit = True | |
228 | ||
229 | self.ss_bitstring = self.samplenum | |
230 | ||
231 | self.ss_item = self.samplenum | |
232 | ||
233 | def decode(self, ss, es, data): | |
234 | for (self.samplenum, pins) in data: | |
235 | ||
236 | # If none of the pins changed, there's nothing to do. | |
237 | if self.oldpins == pins: | |
238 | continue | |
239 | ||
240 | # Store current pin values for the next round. | |
241 | self.oldpins = pins | |
242 | ||
243 | # Get individual pin values into local variables. | |
244 | # Unused channels will have a value of > 1. | |
245 | (tdi, tdo, tck, tms, trst, srst, rtck) = pins | |
246 | ||
247 | # We only care about TCK edges (either rising or falling). | |
248 | if (self.oldtck == tck): | |
249 | continue | |
250 | ||
251 | # Store start/end sample for later usage. | |
252 | self.ss, self.es = ss, es | |
253 | ||
254 | if (self.oldtck == 0 and tck == 1): | |
255 | self.handle_rising_tck_edge(tdi, tdo, tck, tms) | |
256 | ||
257 | self.oldtck = tck |