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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2019 Jiahao Li <reg@ljh.me> | |
5 | ## | |
6 | ## Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | ## of this software and associated documentation files (the "Software"), to deal | |
8 | ## in the Software without restriction, including without limitation the rights | |
9 | ## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | ## copies of the Software, and to permit persons to whom the Software is | |
11 | ## furnished to do so, subject to the following conditions: | |
12 | ## | |
13 | ## The above copyright notice and this permission notice shall be included in all | |
14 | ## copies or substantial portions of the Software. | |
15 | ## | |
16 | ## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | ## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | ## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
19 | ## AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | ## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | ## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
22 | ## SOFTWARE. | |
23 | ||
24 | import sigrokdecode as srd | |
25 | from .lists import * | |
26 | ||
27 | OPCODE_MASK = 0b11100000 | |
28 | REG_ADDR_MASK = 0b00011111 | |
29 | ||
30 | OPCODE_HANDLERS = { | |
31 | 0b00000000: '_process_rcr', | |
32 | 0b00100000: '_process_rbm', | |
33 | 0b01000000: '_process_wcr', | |
34 | 0b01100000: '_process_wbm', | |
35 | 0b10000000: '_process_bfs', | |
36 | 0b10100000: '_process_bfc', | |
37 | 0b11100000: '_process_src', | |
38 | } | |
39 | ||
40 | (ANN_RCR, ANN_RBM, ANN_WCR, ANN_WBM, ANN_BFS, ANN_BFC, ANN_SRC, ANN_DATA, | |
41 | ANN_REG_ADDR, ANN_WARNING) = range(10) | |
42 | ||
43 | REG_ADDR_ECON1 = 0x1F | |
44 | BIT_ECON1_BSEL0 = 0b00000001 | |
45 | BIT_ECON1_BSEL1 = 0b00000010 | |
46 | ||
47 | class Decoder(srd.Decoder): | |
48 | api_version = 3 | |
49 | id = 'enc28j60' | |
50 | name = 'ENC28J60' | |
51 | longname = 'Microchip ENC28J60' | |
52 | desc = 'Microchip ENC28J60 10Base-T Ethernet controller protocol.' | |
53 | license = 'mit' | |
54 | inputs = ['spi'] | |
55 | outputs = [] | |
56 | tags = ['Embedded/industrial', 'Networking'] | |
57 | annotations = ( | |
58 | ('rcr', 'Read Control Register'), | |
59 | ('rbm', 'Read Buffer Memory'), | |
60 | ('wcr', 'Write Control Register'), | |
61 | ('wbm', 'Write Buffer Memory'), | |
62 | ('bfs', 'Bit Field Set'), | |
63 | ('bfc', 'Bit Field Clear'), | |
64 | ('src', 'System Reset Command'), | |
65 | ('data', 'Data'), | |
66 | ('reg-addr', 'Register Address'), | |
67 | ('warning', 'Warning'), | |
68 | ) | |
69 | annotation_rows = ( | |
70 | ('fields', 'Fields', (ANN_DATA, ANN_REG_ADDR)), | |
71 | ('commands', 'Commands', | |
72 | (ANN_RCR, ANN_RBM, ANN_WCR, ANN_WBM, ANN_BFS, ANN_BFC, ANN_SRC)), | |
73 | ('warnings', 'Warnings', (ANN_WARNING,)), | |
74 | ) | |
75 | ||
76 | def __init__(self): | |
77 | self.reset() | |
78 | ||
79 | def reset(self): | |
80 | self.mosi = [] | |
81 | self.miso = [] | |
82 | self.ranges = [] | |
83 | self.cmd_ss = None | |
84 | self.cmd_es = None | |
85 | self.range_ss = None | |
86 | self.range_es = None | |
87 | self.active = False | |
88 | self.bsel0 = None | |
89 | self.bsel1 = None | |
90 | ||
91 | def start(self): | |
92 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
93 | ||
94 | def putc(self, data): | |
95 | self.put(self.cmd_ss, self.cmd_es, self.out_ann, data) | |
96 | ||
97 | def putr(self, data): | |
98 | self.put(self.range_ss, self.range_es, self.out_ann, data) | |
99 | ||
100 | def _process_command(self): | |
101 | if len(self.mosi) == 0: | |
102 | self.active = False | |
103 | return | |
104 | ||
105 | header = self.mosi[0] | |
106 | opcode = header & OPCODE_MASK | |
107 | ||
108 | if opcode not in OPCODE_HANDLERS: | |
109 | self._put_command_warning("Unknown opcode.") | |
110 | self.active = False | |
111 | return | |
112 | ||
113 | getattr(self, OPCODE_HANDLERS[opcode])() | |
114 | ||
115 | self.active = False | |
116 | ||
117 | def _get_register_name(self, reg_addr): | |
118 | if (self.bsel0 is None) or (self.bsel1 is None): | |
119 | # We don't know the bank we're in yet. | |
120 | return None | |
121 | else: | |
122 | bank = (self.bsel1 << 1) + self.bsel0 | |
123 | return REGS[bank][reg_addr] | |
124 | ||
125 | def _put_register_header(self): | |
126 | reg_addr = self.mosi[0] & REG_ADDR_MASK | |
127 | reg_name = self._get_register_name(reg_addr) | |
128 | ||
129 | self.range_ss, self.range_es = self.cmd_ss, self.ranges[1][0] | |
130 | ||
131 | if reg_name is None: | |
132 | # We don't know the bank we're in yet. | |
133 | self.putr([ANN_REG_ADDR, [ | |
134 | 'Reg Bank ? Addr 0x{0:02X}'.format(reg_addr), | |
135 | '?:{0:02X}'.format(reg_addr)]]) | |
136 | self.putr([ANN_WARNING, ['Warning: Register bank not known yet.', | |
137 | 'Warning']]) | |
138 | else: | |
139 | self.putr([ANN_REG_ADDR, ['Reg {0}'.format(reg_name), | |
140 | '{0}'.format(reg_name)]]) | |
141 | ||
142 | if (reg_name == '-') or (reg_name == 'Reserved'): | |
143 | self.putr([ANN_WARNING, ['Warning: Invalid register accessed.', | |
144 | 'Warning']]) | |
145 | ||
146 | def _put_data_byte(self, data, byte_index, binary=False): | |
147 | self.range_ss = self.ranges[byte_index][0] | |
148 | if byte_index == len(self.mosi) - 1: | |
149 | self.range_es = self.cmd_es | |
150 | else: | |
151 | self.range_es = self.ranges[byte_index + 1][0] | |
152 | ||
153 | if binary: | |
154 | self.putr([ANN_DATA, ['Data 0b{0:08b}'.format(data), | |
155 | '{0:08b}'.format(data)]]) | |
156 | else: | |
157 | self.putr([ANN_DATA, ['Data 0x{0:02X}'.format(data), | |
158 | '{0:02X}'.format(data)]]) | |
159 | ||
160 | def _put_command_warning(self, reason): | |
161 | self.putc([ANN_WARNING, ['Warning: {0}'.format(reason), 'Warning']]) | |
162 | ||
163 | def _process_rcr(self): | |
164 | self.putc([ANN_RCR, ['Read Control Register', 'RCR']]) | |
165 | ||
166 | if (len(self.mosi) != 2) and (len(self.mosi) != 3): | |
167 | self._put_command_warning('Invalid command length.') | |
168 | return | |
169 | ||
170 | self._put_register_header() | |
171 | ||
172 | reg_name = self._get_register_name(self.mosi[0] & REG_ADDR_MASK) | |
173 | if reg_name is None: | |
174 | # We can't tell if we're accessing MAC/MII registers or not | |
175 | # Let's trust the user in this case. | |
176 | pass | |
177 | else: | |
178 | if (reg_name[0] == 'M') and (len(self.mosi) != 3): | |
179 | self._put_command_warning('Attempting to read a MAC/MII ' | |
180 | + 'register without using the dummy byte.') | |
181 | return | |
182 | ||
183 | if (reg_name[0] != 'M') and (len(self.mosi) != 2): | |
184 | self._put_command_warning('Attempting to read a non-MAC/MII ' | |
185 | + 'register using the dummy byte.') | |
186 | return | |
187 | ||
188 | if len(self.mosi) == 2: | |
189 | self._put_data_byte(self.miso[1], 1) | |
190 | else: | |
191 | self.range_ss, self.range_es = self.ranges[1][0], self.ranges[2][0] | |
192 | self.putr([ANN_DATA, ['Dummy Byte', 'Dummy']]) | |
193 | self._put_data_byte(self.miso[2], 2) | |
194 | ||
195 | def _process_rbm(self): | |
196 | if self.mosi[0] != 0b00111010: | |
197 | self._put_command_warning('Invalid header byte.') | |
198 | return | |
199 | ||
200 | self.putc([ANN_RBM, ['Read Buffer Memory: Length {0}'.format( | |
201 | len(self.mosi) - 1), 'RBM']]) | |
202 | ||
203 | for i in range(1, len(self.miso)): | |
204 | self._put_data_byte(self.miso[i], i) | |
205 | ||
206 | def _process_wcr(self): | |
207 | self.putc([ANN_WCR, ['Write Control Register', 'WCR']]) | |
208 | ||
209 | if len(self.mosi) != 2: | |
210 | self._put_command_warning('Invalid command length.') | |
211 | return | |
212 | ||
213 | self._put_register_header() | |
214 | self._put_data_byte(self.mosi[1], 1) | |
215 | ||
216 | if self.mosi[0] & REG_ADDR_MASK == REG_ADDR_ECON1: | |
217 | self.bsel0 = (self.mosi[1] & BIT_ECON1_BSEL0) >> 0 | |
218 | self.bsel1 = (self.mosi[1] & BIT_ECON1_BSEL1) >> 1 | |
219 | ||
220 | def _process_wbm(self): | |
221 | if self.mosi[0] != 0b01111010: | |
222 | self._put_command_warning('Invalid header byte.') | |
223 | return | |
224 | ||
225 | self.putc([ANN_WBM, ['Write Buffer Memory: Length {0}'.format( | |
226 | len(self.mosi) - 1), 'WBM']]) | |
227 | ||
228 | for i in range(1, len(self.mosi)): | |
229 | self._put_data_byte(self.mosi[i], i) | |
230 | ||
231 | def _process_bfc(self): | |
232 | self.putc([ANN_BFC, ['Bit Field Clear', 'BFC']]) | |
233 | ||
234 | if len(self.mosi) != 2: | |
235 | self._put_command_warning('Invalid command length.') | |
236 | return | |
237 | ||
238 | self._put_register_header() | |
239 | self._put_data_byte(self.mosi[1], 1, True) | |
240 | ||
241 | if self.mosi[0] & REG_ADDR_MASK == REG_ADDR_ECON1: | |
242 | if self.mosi[1] & BIT_ECON1_BSEL0: | |
243 | self.bsel0 = 0 | |
244 | if self.mosi[1] & BIT_ECON1_BSEL1: | |
245 | self.bsel1 = 0 | |
246 | ||
247 | def _process_bfs(self): | |
248 | self.putc([ANN_BFS, ['Bit Field Set', 'BFS']]) | |
249 | ||
250 | if len(self.mosi) != 2: | |
251 | self._put_command_warning('Invalid command length.') | |
252 | return | |
253 | ||
254 | self._put_register_header() | |
255 | self._put_data_byte(self.mosi[1], 1, True) | |
256 | ||
257 | if self.mosi[0] & REG_ADDR_MASK == REG_ADDR_ECON1: | |
258 | if self.mosi[1] & BIT_ECON1_BSEL0: | |
259 | self.bsel0 = 1 | |
260 | if self.mosi[1] & BIT_ECON1_BSEL1: | |
261 | self.bsel1 = 1 | |
262 | ||
263 | def _process_src(self): | |
264 | self.putc([ANN_SRC, ['System Reset Command', 'SRC']]) | |
265 | ||
266 | if len(self.mosi) != 1: | |
267 | self._put_command_warning('Invalid command length.') | |
268 | return | |
269 | ||
270 | self.bsel0 = 0 | |
271 | self.bsel1 = 0 | |
272 | ||
273 | def decode(self, ss, es, data): | |
274 | ptype, data1, data2 = data | |
275 | ||
276 | if ptype == 'CS-CHANGE': | |
277 | new_cs = data2 | |
278 | ||
279 | if new_cs == 0: | |
280 | self.active = True | |
281 | self.cmd_ss = ss | |
282 | self.mosi = [] | |
283 | self.miso = [] | |
284 | self.ranges = [] | |
285 | elif new_cs == 1: | |
286 | if self.active: | |
287 | self.cmd_es = es | |
288 | self._process_command() | |
289 | elif ptype == 'DATA': | |
290 | mosi, miso = data1, data2 | |
291 | ||
292 | self.mosi.append(mosi) | |
293 | self.miso.append(miso) | |
294 | self.ranges.append((ss, es)) |