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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2012-2014 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 | cmd_name = { | |
24 | # Normal commands (CMD) | |
25 | 0: 'GO_IDLE_STATE', | |
26 | 1: 'SEND_OP_COND', | |
27 | 6: 'SWITCH_FUNC', | |
28 | 8: 'SEND_IF_COND', | |
29 | 9: 'SEND_CSD', | |
30 | 10: 'SEND_CID', | |
31 | 12: 'STOP_TRANSMISSION', | |
32 | 13: 'SEND_STATUS', | |
33 | 16: 'SET_BLOCKLEN', | |
34 | 17: 'READ_SINGLE_BLOCK', | |
35 | 18: 'READ_MULTIPLE_BLOCK', | |
36 | 24: 'WRITE_BLOCK', | |
37 | 25: 'WRITE_MULTIPLE_BLOCK', | |
38 | 27: 'PROGRAM_CSD', | |
39 | 28: 'SET_WRITE_PROT', | |
40 | 29: 'CLR_WRITE_PROT', | |
41 | 30: 'SEND_WRITE_PROT', | |
42 | 32: 'ERASE_WR_BLK_START_ADDR', | |
43 | 33: 'ERASE_WR_BLK_END_ADDR', | |
44 | 38: 'ERASE', | |
45 | 42: 'LOCK_UNLOCK', | |
46 | 55: 'APP_CMD', | |
47 | 56: 'GEN_CMD', | |
48 | 58: 'READ_OCR', | |
49 | 59: 'CRC_ON_OFF', | |
50 | # CMD60-63: Reserved for manufacturer | |
51 | ||
52 | # Application-specific commands (ACMD) | |
53 | 13: 'SD_STATUS', | |
54 | 18: 'Reserved for SD security applications', | |
55 | 22: 'SEND_NUM_WR_BLOCKS', | |
56 | 23: 'SET_WR_BLK_ERASE_COUNT', | |
57 | 25: 'Reserved for SD security applications', | |
58 | 26: 'Reserved for SD security applications', | |
59 | 38: 'Reserved for SD security applications', | |
60 | 41: 'SD_SEND_OP_COND', | |
61 | 42: 'SET_CLR_CARD_DETECT', | |
62 | 43: 'Reserved for SD security applications', | |
63 | 44: 'Reserved for SD security applications', | |
64 | 45: 'Reserved for SD security applications', | |
65 | 46: 'Reserved for SD security applications', | |
66 | 47: 'Reserved for SD security applications', | |
67 | 48: 'Reserved for SD security applications', | |
68 | 49: 'Reserved for SD security applications', | |
69 | 51: 'SEND_SCR', | |
70 | } | |
71 | ||
72 | def ann_cmd_list(): | |
73 | l = [] | |
74 | for i in range(63 + 1): | |
75 | l.append(['cmd%d' % i, 'CMD%d' % i]) | |
76 | return l | |
77 | ||
78 | class Decoder(srd.Decoder): | |
79 | api_version = 1 | |
80 | id = 'sdcard_spi' | |
81 | name = 'SD card (SPI mode)' | |
82 | longname = 'Secure Digital card (SPI mode)' | |
83 | desc = 'Secure Digital card (SPI mode) low-level protocol.' | |
84 | license = 'gplv2+' | |
85 | inputs = ['spi'] | |
86 | outputs = ['sdcard_spi'] | |
87 | probes = [] | |
88 | optional_probes = [] | |
89 | options = {} | |
90 | annotations = ann_cmd_list() + [ | |
91 | ['cmd-token', 'Command token'], | |
92 | ['r1', 'R1 reply'], | |
93 | ['r1b', 'R1B reply'], | |
94 | ['r2', 'R2 reply'], | |
95 | ['r3', 'R3 reply'], | |
96 | ['r7', 'R7 reply'], | |
97 | ['bits', 'Bits'], | |
98 | ] | |
99 | ||
100 | def __init__(self, **kwargs): | |
101 | self.state = 'IDLE' | |
102 | self.samplenum = 0 | |
103 | self.ss, self.es = 0, 0 | |
104 | self.bit_ss, self.bit_es = 0, 0 | |
105 | self.cmd_ss, self.cmd_es = 0, 0 | |
106 | self.cmd_token = [] | |
107 | self.is_acmd = False # Indicates CMD vs. ACMD | |
108 | self.blocklen = 0 | |
109 | self.read_buf = [] | |
110 | ||
111 | def start(self): | |
112 | # self.out_python = self.register(srd.OUTPUT_PYTHON) | |
113 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
114 | ||
115 | def putx(self, data): | |
116 | self.put(self.cmd_ss, self.cmd_es, self.out_ann, data) | |
117 | ||
118 | def putb(self, data): | |
119 | self.put(self.bit_ss, self.bit_es, self.out_ann, data) | |
120 | ||
121 | def handle_command_token(self, mosi, miso): | |
122 | # Command tokens (6 bytes) are sent (MSB-first) by the host. | |
123 | # | |
124 | # Format: | |
125 | # - CMD[47:47]: Start bit (always 0) | |
126 | # - CMD[46:46]: Transmitter bit (1 == host) | |
127 | # - CMD[45:40]: Command index (BCD; valid: 0-63) | |
128 | # - CMD[39:08]: Argument | |
129 | # - CMD[07:01]: CRC7 | |
130 | # - CMD[00:00]: End bit (always 1) | |
131 | ||
132 | if len(self.cmd_token) == 0: | |
133 | self.cmd_ss = self.ss | |
134 | ||
135 | self.cmd_token.append(mosi) | |
136 | # TODO: Record MISO too? | |
137 | ||
138 | # All command tokens are 6 bytes long. | |
139 | if len(self.cmd_token) < 6: | |
140 | return | |
141 | ||
142 | self.cmd_es = self.es | |
143 | ||
144 | # Received all 6 bytes of the command token. Now decode it. | |
145 | ||
146 | t = self.cmd_token | |
147 | ||
148 | # CMD or ACMD? | |
149 | s = 'ACMD' if self.is_acmd else 'CMD' | |
150 | # TODO | |
151 | self.putx([64, [s + ': %02x %02x %02x %02x %02x %02x' % tuple(t)]]) | |
152 | ||
153 | # Start bit | |
154 | self.startbit = (t[0] & (1 << 7)) >> 7 | |
155 | self.putb([70, ['Start bit: %d' % self.startbit]]) | |
156 | if self.startbit != 0: | |
157 | # TODO | |
158 | self.putb([1, ['Warning: Start bit != 0']]) | |
159 | ||
160 | # Transmitter bit | |
161 | self.transmitterbit = (t[0] & (1 << 6)) >> 6 | |
162 | self.putb([70, ['Transmitter bit: %d' % self.transmitterbit]]) | |
163 | if self.transmitterbit != 0: | |
164 | # TODO | |
165 | self.putb([1, ['Warning: Transmitter bit != 1']]) | |
166 | ||
167 | # Command index | |
168 | cmd = self.cmd_index = t[0] & 0x3f | |
169 | # TODO | |
170 | self.putb([70, ['Command: %s%d (%s)' % (s, cmd, cmd_name[cmd])]]) | |
171 | ||
172 | # Argument | |
173 | self.arg = (t[1] << 24) | (t[2] << 16) | (t[3] << 8) | t[4] | |
174 | self.putb([70, ['Argument: 0x%04x' % self.arg]]) | |
175 | # TODO: Sanity check on argument? Must be per-cmd? | |
176 | ||
177 | # CRC | |
178 | # TODO: Check CRC. | |
179 | self.crc = t[5] >> 1 | |
180 | self.putb([70, ['CRC: 0x%01x' % self.crc]]) | |
181 | ||
182 | # End bit | |
183 | self.endbit = t[5] & (1 << 0) | |
184 | self.putb([70, ['End bit: %d' % self.endbit]]) | |
185 | if self.endbit != 1: | |
186 | # TODO | |
187 | self.putb([1, ['Warning: End bit != 1']]) | |
188 | ||
189 | # Handle command. | |
190 | if cmd in (0, 1, 9, 16, 17, 41, 49, 55, 59): | |
191 | self.state = 'HANDLE CMD%d' % cmd | |
192 | ||
193 | # ... | |
194 | if self.is_acmd and cmd != 55: | |
195 | self.is_acmd = False | |
196 | ||
197 | self.cmd_token = [] | |
198 | ||
199 | def handle_cmd0(self, ): | |
200 | # CMD0: GO_IDLE_STATE | |
201 | # TODO | |
202 | self.putx([0, ['CMD0: Card reset / idle state']]) | |
203 | self.state = 'GET RESPONSE R1' | |
204 | ||
205 | def handle_cmd1(self): | |
206 | # CMD1: SEND_OP_COND | |
207 | # TODO | |
208 | hcs = (self.arg & (1 << 30)) >> 30 | |
209 | self.putb([1, ['HCS bit = %d' % hcs]]) | |
210 | self.state = 'GET RESPONSE R1' | |
211 | ||
212 | def handle_cmd9(self): | |
213 | # CMD9: SEND_CSD (128 bits / 16 bytes) | |
214 | if len(self.read_buf) == 0: | |
215 | self.cmd_ss = self.ss | |
216 | self.read_buf.append(self.miso) | |
217 | # FIXME | |
218 | ### if len(self.read_buf) < 16: | |
219 | if len(self.read_buf) < 16 + 4: | |
220 | return | |
221 | self.cmd_es = self.es | |
222 | self.read_buf = self.read_buf[4:] ### TODO: Document or redo. | |
223 | self.putx([9, ['CSD: %s' % self.read_buf]]) | |
224 | # TODO: Decode all bits. | |
225 | self.read_buf = [] | |
226 | ### self.state = 'GET RESPONSE R1' | |
227 | self.state = 'IDLE' | |
228 | ||
229 | def handle_cmd10(self): | |
230 | # CMD10: SEND_CID (128 bits / 16 bytes) | |
231 | self.read_buf.append(self.miso) | |
232 | if len(self.read_buf) < 16: | |
233 | return | |
234 | self.putx([10, ['CID: %s' % self.read_buf]]) | |
235 | # TODO: Decode all bits. | |
236 | self.read_buf = [] | |
237 | self.state = 'GET RESPONSE R1' | |
238 | ||
239 | def handle_cmd16(self): | |
240 | # CMD16: SET_BLOCKLEN | |
241 | self.blocklen = self.arg # TODO | |
242 | # TODO: Sanity check on block length. | |
243 | self.putx([16, ['Block length: %d' % self.blocklen]]) | |
244 | self.state = 'GET RESPONSE R1' | |
245 | ||
246 | def handle_cmd17(self): | |
247 | # CMD17: READ_SINGLE_BLOCK | |
248 | if len(self.read_buf) == 0: | |
249 | self.cmd_ss = self.ss | |
250 | self.read_buf.append(self.miso) | |
251 | if len(self.read_buf) == 1: | |
252 | self.putx([0, ['Read block at address: 0x%04x' % self.arg]]) | |
253 | if len(self.read_buf) < self.blocklen + 2: # FIXME | |
254 | return | |
255 | self.cmd_es = self.es | |
256 | self.read_buf = self.read_buf[2:] # FIXME | |
257 | self.putx([17, ['Block data: %s' % self.read_buf]]) | |
258 | self.read_buf = [] | |
259 | self.state = 'GET RESPONSE R1' | |
260 | ||
261 | def handle_cmd41(self): | |
262 | # ACMD41: SD_SEND_OP_COND | |
263 | self.state = 'GET RESPONSE R1' | |
264 | ||
265 | def handle_cmd49(self): | |
266 | self.state = 'GET RESPONSE R1' | |
267 | ||
268 | def handle_cmd55(self): | |
269 | # CMD55: APP_CMD | |
270 | self.is_acmd = True | |
271 | self.state = 'GET RESPONSE R1' | |
272 | ||
273 | def handle_cmd59(self): | |
274 | # CMD59: CRC_ON_OFF | |
275 | crc_on_off = self.arg & (1 << 0) | |
276 | s = 'on' if crc_on_off == 1 else 'off' | |
277 | self.putb([59, ['SD card CRC option: %s' % s]]) | |
278 | self.state = 'GET RESPONSE R1' | |
279 | ||
280 | def handle_cid_register(self): | |
281 | # Card Identification (CID) register, 128bits | |
282 | ||
283 | cid = self.cid | |
284 | ||
285 | # Manufacturer ID: CID[127:120] (8 bits) | |
286 | mid = cid[15] | |
287 | ||
288 | # OEM/Application ID: CID[119:104] (16 bits) | |
289 | oid = (cid[14] << 8) | cid[13] | |
290 | ||
291 | # Product name: CID[103:64] (40 bits) | |
292 | pnm = 0 | |
293 | for i in range(12, 8 - 1, -1): | |
294 | pnm <<= 8 | |
295 | pnm |= cid[i] | |
296 | ||
297 | # Product revision: CID[63:56] (8 bits) | |
298 | prv = cid[7] | |
299 | ||
300 | # Product serial number: CID[55:24] (32 bits) | |
301 | psn = 0 | |
302 | for i in range(6, 3 - 1, -1): | |
303 | psn <<= 8 | |
304 | psn |= cid[i] | |
305 | ||
306 | # RESERVED: CID[23:20] (4 bits) | |
307 | ||
308 | # Manufacturing date: CID[19:8] (12 bits) | |
309 | # TODO | |
310 | ||
311 | # CRC7 checksum: CID[7:1] (7 bits) | |
312 | # TODO | |
313 | ||
314 | # Not used, always 1: CID[0:0] (1 bit) | |
315 | # TODO | |
316 | ||
317 | def handle_response_r1(self, res): | |
318 | # The R1 response token format (1 byte). | |
319 | # Sent by the card after every command except for SEND_STATUS. | |
320 | ||
321 | self.cmd_ss, self.cmd_es = self.ss, self.es | |
322 | ||
323 | self.putx([65, ['R1: 0x%02x' % res]]) | |
324 | ||
325 | # TODO: Configurable whether all bits are decoded. | |
326 | ||
327 | # 'In idle state' bit | |
328 | s = '' if (res & (1 << 0)) else 'not ' | |
329 | self.putb([0, ['Card is %sin idle state' % s]]) | |
330 | ||
331 | # 'Erase reset' bit | |
332 | s = '' if (res & (1 << 1)) else 'not ' | |
333 | self.putb([0, ['Erase sequence %scleared' % s]]) | |
334 | ||
335 | # 'Illegal command' bit | |
336 | s = 'I' if (res & (1 << 2)) else 'No i' | |
337 | self.putb([0, ['%sllegal command detected' % s]]) | |
338 | ||
339 | # 'Communication CRC error' bit | |
340 | s = 'failed' if (res & (1 << 3)) else 'was successful' | |
341 | self.putb([0, ['CRC check of last command %s' % s]]) | |
342 | ||
343 | # 'Erase sequence error' bit | |
344 | s = 'E' if (res & (1 << 4)) else 'No e' | |
345 | self.putb([0, ['%srror in the sequence of erase commands' % s]]) | |
346 | ||
347 | # 'Address error' bit | |
348 | s = 'M' if (res & (1 << 4)) else 'No m' | |
349 | self.putb([0, ['%sisaligned address used in command' % s]]) | |
350 | ||
351 | # 'Parameter error' bit | |
352 | s = '' if (res & (1 << 4)) else 'not ' | |
353 | self.putb([0, ['Command argument %soutside allowed range' % s]]) | |
354 | ||
355 | self.state = 'IDLE' | |
356 | ||
357 | def handle_response_r1b(self, res): | |
358 | # TODO | |
359 | pass | |
360 | ||
361 | def handle_response_r2(self, res): | |
362 | # TODO | |
363 | pass | |
364 | ||
365 | def handle_response_r3(self, res): | |
366 | # TODO | |
367 | pass | |
368 | ||
369 | # Note: Response token formats R4 and R5 are reserved for SDIO. | |
370 | ||
371 | # TODO: R6? | |
372 | ||
373 | def handle_response_r7(self, res): | |
374 | # TODO | |
375 | pass | |
376 | ||
377 | def decode(self, ss, es, data): | |
378 | ptype, mosi, miso = data | |
379 | ||
380 | # For now, ignore non-data packets. | |
381 | if ptype != 'DATA': | |
382 | return | |
383 | ||
384 | self.ss, self.es = ss, es | |
385 | ||
386 | # State machine. | |
387 | if self.state == 'IDLE': | |
388 | # Ignore stray 0xff bytes, some devices seem to send those!? | |
389 | if mosi == 0xff: # TODO? | |
390 | return | |
391 | self.state = 'GET COMMAND TOKEN' | |
392 | self.handle_command_token(mosi, miso) | |
393 | elif self.state == 'GET COMMAND TOKEN': | |
394 | self.handle_command_token(mosi, miso) | |
395 | elif self.state.startswith('HANDLE CMD'): | |
396 | self.miso, self.mosi = miso, mosi | |
397 | # Call the respective handler method for the command. | |
398 | s = 'handle_cmd%s' % self.state[10:].lower() | |
399 | handle_cmd = getattr(self, s) | |
400 | handle_cmd() | |
401 | elif self.state.startswith('GET RESPONSE'): | |
402 | # Ignore stray 0xff bytes, some devices seem to send those!? | |
403 | if miso == 0xff: # TODO? | |
404 | return | |
405 | ||
406 | # Call the respective handler method for the response. | |
407 | s = 'handle_response_%s' % self.state[13:].lower() | |
408 | handle_response = getattr(self, s) | |
409 | handle_response(miso) | |
410 | ||
411 | self.state = 'IDLE' | |
412 | else: | |
413 | raise Exception('Invalid state: %s' % self.state) | |
414 |