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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-desc', 'Command description'], | |
92 | ['r1', 'R1 reply'], | |
93 | ['r1b', 'R1B reply'], | |
94 | ['r2', 'R2 reply'], | |
95 | ['r3', 'R3 reply'], | |
96 | ['r7', 'R7 reply'], | |
97 | ['bits', 'Bits'], | |
98 | ['bit-warnings', 'Bit warnings'], | |
99 | ] | |
100 | annotation_rows = ( | |
101 | ('bits', 'Bits', (70, 71)), | |
102 | ('cmd-reply', 'Commands/replies', | |
103 | tuple(range(0, 63 + 1)) + tuple(range(65, 69 + 1))), | |
104 | ('cmd-token', 'Command tokens', (64,)), | |
105 | ) | |
106 | ||
107 | def __init__(self, **kwargs): | |
108 | self.state = 'IDLE' | |
109 | self.samplenum = 0 | |
110 | self.ss, self.es = 0, 0 | |
111 | self.bit_ss, self.bit_es = 0, 0 | |
112 | self.cmd_ss, self.cmd_es = 0, 0 | |
113 | self.cmd_token = [] | |
114 | self.cmd_token_bits = [] | |
115 | self.is_acmd = False # Indicates CMD vs. ACMD | |
116 | self.blocklen = 0 | |
117 | self.read_buf = [] | |
118 | ||
119 | def start(self): | |
120 | # self.out_python = self.register(srd.OUTPUT_PYTHON) | |
121 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
122 | ||
123 | def putx(self, data): | |
124 | self.put(self.cmd_ss, self.cmd_es, self.out_ann, data) | |
125 | ||
126 | def putb(self, data): | |
127 | self.put(self.bit_ss, self.bit_es, self.out_ann, data) | |
128 | ||
129 | def handle_command_token(self, mosi, miso): | |
130 | # Command tokens (6 bytes) are sent (MSB-first) by the host. | |
131 | # | |
132 | # Format: | |
133 | # - CMD[47:47]: Start bit (always 0) | |
134 | # - CMD[46:46]: Transmitter bit (1 == host) | |
135 | # - CMD[45:40]: Command index (BCD; valid: 0-63) | |
136 | # - CMD[39:08]: Argument | |
137 | # - CMD[07:01]: CRC7 | |
138 | # - CMD[00:00]: End bit (always 1) | |
139 | ||
140 | if len(self.cmd_token) == 0: | |
141 | self.cmd_ss = self.ss | |
142 | ||
143 | self.cmd_token.append(mosi) | |
144 | self.cmd_token_bits.append(self.mosi_bits) | |
145 | ||
146 | # All command tokens are 6 bytes long. | |
147 | if len(self.cmd_token) < 6: | |
148 | return | |
149 | ||
150 | self.cmd_es = self.es | |
151 | ||
152 | t = self.cmd_token | |
153 | ||
154 | # CMD or ACMD? | |
155 | s = 'ACMD' if self.is_acmd else 'CMD' | |
156 | ||
157 | def tb(byte, bit): | |
158 | return self.cmd_token_bits[5 - byte][7 - bit] | |
159 | ||
160 | # Bits[47:47]: Start bit (always 0) | |
161 | bit, self.bit_ss, self.bit_es = tb(5, 7)[0], tb(5, 7)[1], tb(5, 7)[2] | |
162 | if bit == 0: | |
163 | self.putb([70, ['Start bit: %d' % bit]]) | |
164 | else: | |
165 | self.putb([71, ['Start bit: %s (Warning: Must be 0!)' % bit]]) | |
166 | ||
167 | # Bits[46:46]: Transmitter bit (1 == host) | |
168 | bit, self.bit_ss, self.bit_es = tb(5, 6)[0], tb(5, 6)[1], tb(5, 6)[2] | |
169 | if bit == 1: | |
170 | self.putb([70, ['Transmitter bit: %d' % bit]]) | |
171 | else: | |
172 | self.putb([71, ['Transmitter bit: %d (Warning: Must be 1!)' % bit]]) | |
173 | ||
174 | # Bits[45:40]: Command index (BCD; valid: 0-63) | |
175 | cmd = self.cmd_index = t[0] & 0x3f | |
176 | self.bit_ss, self.bit_es = tb(5, 5)[1], tb(5, 0)[2] | |
177 | self.putb([70, ['Command: %s%d (%s)' % (s, cmd, cmd_name[cmd])]]) | |
178 | ||
179 | # Bits[39:8]: Argument | |
180 | self.arg = (t[1] << 24) | (t[2] << 16) | (t[3] << 8) | t[4] | |
181 | self.bit_ss, self.bit_es = tb(4, 7)[1], tb(1, 0)[2] | |
182 | self.putb([70, ['Argument: 0x%04x' % self.arg]]) | |
183 | ||
184 | # Bits[7:1]: CRC7 | |
185 | # TODO: Check CRC7. | |
186 | crc = t[5] >> 1 | |
187 | self.bit_ss, self.bit_es = tb(0, 7)[1], tb(0, 1)[2] | |
188 | self.putb([70, ['CRC7: 0x%01x' % crc]]) | |
189 | ||
190 | # Bits[0:0]: End bit (always 1) | |
191 | bit, self.bit_ss, self.bit_es = tb(0, 0)[0], tb(0, 0)[1], tb(0, 0)[2] | |
192 | self.putb([70, ['End bit: %d' % bit]]) | |
193 | if bit == 1: | |
194 | self.putb([70, ['End bit: %d' % bit]]) | |
195 | else: | |
196 | self.putb([71, ['End bit: %d (Warning: Must be 1!)' % bit]]) | |
197 | ||
198 | # Handle command. | |
199 | if cmd in (0, 1, 9, 16, 17, 41, 49, 55, 59): | |
200 | self.state = 'HANDLE CMD%d' % cmd | |
201 | a = '%s%d (%s)' % (s, cmd, cmd_name[cmd]) | |
202 | else: | |
203 | self.state = 'HANDLE CMD999' | |
204 | a = '%s%d: %02x %02x %02x %02x %02x %02x' % ((s, cmd) + tuple(t)) | |
205 | ||
206 | self.putx([cmd, [a]]) | |
207 | ||
208 | # ... | |
209 | if self.is_acmd and cmd != 55: | |
210 | self.is_acmd = False | |
211 | ||
212 | def handle_cmd0(self, ): | |
213 | # CMD0: GO_IDLE_STATE | |
214 | self.putx([64, ['Reset the SD card']]) | |
215 | self.state = 'GET RESPONSE R1' | |
216 | ||
217 | def handle_cmd1(self): | |
218 | # CMD1: SEND_OP_COND | |
219 | self.putx([64, ['Send HCS info and activate the card init process']]) | |
220 | hcs = (self.arg & (1 << 30)) >> 30 | |
221 | self.bit_ss = self.cmd_token_bits[5 - 4][7 - 6][1] | |
222 | self.bit_es = self.cmd_token_bits[5 - 4][7 - 6][2] | |
223 | self.putb([70, ['HCS: %d' % hcs]]) | |
224 | self.state = 'GET RESPONSE R1' | |
225 | ||
226 | def handle_cmd9(self): | |
227 | # CMD9: SEND_CSD (128 bits / 16 bytes) | |
228 | self.putx([64, ['Ask card to send its card specific data (CSD)']]) | |
229 | if len(self.read_buf) == 0: | |
230 | self.cmd_ss = self.ss | |
231 | self.read_buf.append(self.miso) | |
232 | # FIXME | |
233 | ### if len(self.read_buf) < 16: | |
234 | if len(self.read_buf) < 16 + 4: | |
235 | return | |
236 | self.cmd_es = self.es | |
237 | self.read_buf = self.read_buf[4:] ### TODO: Document or redo. | |
238 | self.putx([9, ['CSD: %s' % self.read_buf]]) | |
239 | # TODO: Decode all bits. | |
240 | self.read_buf = [] | |
241 | ### self.state = 'GET RESPONSE R1' | |
242 | self.state = 'IDLE' | |
243 | ||
244 | def handle_cmd10(self): | |
245 | # CMD10: SEND_CID (128 bits / 16 bytes) | |
246 | self.putx([64, ['Ask card to send its card identification (CID)']]) | |
247 | self.read_buf.append(self.miso) | |
248 | if len(self.read_buf) < 16: | |
249 | return | |
250 | self.putx([10, ['CID: %s' % self.read_buf]]) | |
251 | # TODO: Decode all bits. | |
252 | self.read_buf = [] | |
253 | self.state = 'GET RESPONSE R1' | |
254 | ||
255 | def handle_cmd16(self): | |
256 | # CMD16: SET_BLOCKLEN | |
257 | self.blocklen = self.arg | |
258 | # TODO: Sanity check on block length. | |
259 | self.putx([64, ['Set the block length to %d bytes' % self.blocklen]]) | |
260 | self.state = 'GET RESPONSE R1' | |
261 | ||
262 | def handle_cmd17(self): | |
263 | # CMD17: READ_SINGLE_BLOCK | |
264 | self.putx([64, ['Read a block from address 0x%04x' % self.arg]]) | |
265 | if len(self.read_buf) == 0: | |
266 | self.cmd_ss = self.ss | |
267 | self.read_buf.append(self.miso) | |
268 | if len(self.read_buf) < self.blocklen + 2: # FIXME | |
269 | return | |
270 | self.cmd_es = self.es | |
271 | self.read_buf = self.read_buf[2:] # FIXME | |
272 | self.putx([17, ['Block data: %s' % self.read_buf]]) | |
273 | self.read_buf = [] | |
274 | self.state = 'GET RESPONSE R1' | |
275 | ||
276 | def handle_cmd41(self): | |
277 | # ACMD41: SD_SEND_OP_COND | |
278 | self.putx([64, ['Send HCS info and activate the card init process']]) | |
279 | self.state = 'GET RESPONSE R1' | |
280 | ||
281 | def handle_cmd49(self): | |
282 | self.state = 'GET RESPONSE R1' | |
283 | ||
284 | def handle_cmd55(self): | |
285 | # CMD55: APP_CMD | |
286 | self.putx([64, ['Next command is an application-specific command']]) | |
287 | self.is_acmd = True | |
288 | self.state = 'GET RESPONSE R1' | |
289 | ||
290 | def handle_cmd59(self): | |
291 | # CMD59: CRC_ON_OFF | |
292 | crc_on_off = self.arg & (1 << 0) | |
293 | s = 'on' if crc_on_off == 1 else 'off' | |
294 | self.putx([64, ['Turn the SD card CRC option %s' % s]]) | |
295 | self.state = 'GET RESPONSE R1' | |
296 | ||
297 | def handle_cmd999(self): | |
298 | self.state = 'GET RESPONSE R1' | |
299 | ||
300 | def handle_cid_register(self): | |
301 | # Card Identification (CID) register, 128bits | |
302 | ||
303 | cid = self.cid | |
304 | ||
305 | # Manufacturer ID: CID[127:120] (8 bits) | |
306 | mid = cid[15] | |
307 | ||
308 | # OEM/Application ID: CID[119:104] (16 bits) | |
309 | oid = (cid[14] << 8) | cid[13] | |
310 | ||
311 | # Product name: CID[103:64] (40 bits) | |
312 | pnm = 0 | |
313 | for i in range(12, 8 - 1, -1): | |
314 | pnm <<= 8 | |
315 | pnm |= cid[i] | |
316 | ||
317 | # Product revision: CID[63:56] (8 bits) | |
318 | prv = cid[7] | |
319 | ||
320 | # Product serial number: CID[55:24] (32 bits) | |
321 | psn = 0 | |
322 | for i in range(6, 3 - 1, -1): | |
323 | psn <<= 8 | |
324 | psn |= cid[i] | |
325 | ||
326 | # RESERVED: CID[23:20] (4 bits) | |
327 | ||
328 | # Manufacturing date: CID[19:8] (12 bits) | |
329 | # TODO | |
330 | ||
331 | # CRC7 checksum: CID[7:1] (7 bits) | |
332 | # TODO | |
333 | ||
334 | # Not used, always 1: CID[0:0] (1 bit) | |
335 | # TODO | |
336 | ||
337 | def handle_response_r1(self, res): | |
338 | # The R1 response token format (1 byte). | |
339 | # Sent by the card after every command except for SEND_STATUS. | |
340 | ||
341 | self.cmd_ss, self.cmd_es = self.miso_bits[0][1], self.miso_bits[7][2] | |
342 | self.putx([65, ['R1: 0x%02x' % res]]) | |
343 | ||
344 | def putbit(bit, data): | |
345 | b = self.miso_bits[7 - bit] | |
346 | self.bit_ss, self.bit_es = b[1], b[2] | |
347 | self.putb([70, data]) | |
348 | ||
349 | # Bit 0: 'In idle state' bit | |
350 | s = '' if (res & (1 << 0)) else 'not ' | |
351 | putbit(0, ['Card is %sin idle state' % s]) | |
352 | ||
353 | # Bit 1: 'Erase reset' bit | |
354 | s = '' if (res & (1 << 1)) else 'not ' | |
355 | putbit(1, ['Erase sequence %scleared' % s]) | |
356 | ||
357 | # Bit 2: 'Illegal command' bit | |
358 | s = 'I' if (res & (1 << 2)) else 'No i' | |
359 | putbit(2, ['%sllegal command detected' % s]) | |
360 | ||
361 | # Bit 3: 'Communication CRC error' bit | |
362 | s = 'failed' if (res & (1 << 3)) else 'was successful' | |
363 | putbit(3, ['CRC check of last command %s' % s]) | |
364 | ||
365 | # Bit 4: 'Erase sequence error' bit | |
366 | s = 'E' if (res & (1 << 4)) else 'No e' | |
367 | putbit(4, ['%srror in the sequence of erase commands' % s]) | |
368 | ||
369 | # Bit 5: 'Address error' bit | |
370 | s = 'M' if (res & (1 << 4)) else 'No m' | |
371 | putbit(5, ['%sisaligned address used in command' % s]) | |
372 | ||
373 | # Bit 6: 'Parameter error' bit | |
374 | s = '' if (res & (1 << 4)) else 'not ' | |
375 | putbit(6, ['Command argument %soutside allowed range' % s]) | |
376 | ||
377 | # Bit 7: Always set to 0 | |
378 | putbit(7, ['Bit 7 (always 0)']) | |
379 | ||
380 | self.state = 'IDLE' | |
381 | ||
382 | def handle_response_r1b(self, res): | |
383 | # TODO | |
384 | pass | |
385 | ||
386 | def handle_response_r2(self, res): | |
387 | # TODO | |
388 | pass | |
389 | ||
390 | def handle_response_r3(self, res): | |
391 | # TODO | |
392 | pass | |
393 | ||
394 | # Note: Response token formats R4 and R5 are reserved for SDIO. | |
395 | ||
396 | # TODO: R6? | |
397 | ||
398 | def handle_response_r7(self, res): | |
399 | # TODO | |
400 | pass | |
401 | ||
402 | def decode(self, ss, es, data): | |
403 | ptype, mosi, miso = data | |
404 | ||
405 | # For now, only use DATA and BITS packets. | |
406 | if ptype not in ('DATA', 'BITS'): | |
407 | return | |
408 | ||
409 | # Store the individual bit values and ss/es numbers. The next packet | |
410 | # is guaranteed to be a 'DATA' packet belonging to this 'BITS' one. | |
411 | if ptype == 'BITS': | |
412 | self.miso_bits, self.mosi_bits = miso, mosi | |
413 | return | |
414 | ||
415 | self.ss, self.es = ss, es | |
416 | ||
417 | # State machine. | |
418 | if self.state == 'IDLE': | |
419 | # Ignore stray 0xff bytes, some devices seem to send those!? | |
420 | if mosi == 0xff: # TODO? | |
421 | return | |
422 | self.state = 'GET COMMAND TOKEN' | |
423 | self.handle_command_token(mosi, miso) | |
424 | elif self.state == 'GET COMMAND TOKEN': | |
425 | self.handle_command_token(mosi, miso) | |
426 | elif self.state.startswith('HANDLE CMD'): | |
427 | self.miso, self.mosi = miso, mosi | |
428 | # Call the respective handler method for the command. | |
429 | s = 'handle_cmd%s' % self.state[10:].lower() | |
430 | handle_cmd = getattr(self, s) | |
431 | handle_cmd() | |
432 | self.cmd_token = [] | |
433 | self.cmd_token_bits = [] | |
434 | elif self.state.startswith('GET RESPONSE'): | |
435 | # Ignore stray 0xff bytes, some devices seem to send those!? | |
436 | if miso == 0xff: # TODO? | |
437 | return | |
438 | ||
439 | # Call the respective handler method for the response. | |
440 | s = 'handle_response_%s' % self.state[13:].lower() | |
441 | handle_response = getattr(self, s) | |
442 | handle_response(miso) | |
443 | ||
444 | self.state = 'IDLE' | |
445 | else: | |
446 | raise Exception('Invalid state: %s' % self.state) | |
447 |