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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2011-2016 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, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | import sigrokdecode as srd | |
21 | from .lists import * | |
22 | ||
23 | L = len(cmds) | |
24 | ||
25 | # Don't forget to keep this in sync with 'cmds' is lists.py. | |
26 | class Ann: | |
27 | WRSR, PP, READ, WRDI, RDSR, WREN, FAST_READ, SE, RDSCUR, WRSCUR, \ | |
28 | RDSR2, CE, ESRY, DSRY, REMS, RDID, RDP_RES, CP, ENSO, DP, READ2X, \ | |
29 | EXSO, CE2, BE, REMS2, \ | |
30 | BIT, FIELD, WARN = range(L + 3) | |
31 | ||
32 | def cmd_annotation_classes(): | |
33 | return tuple([tuple([cmd[0].lower(), cmd[1]]) for cmd in cmds.values()]) | |
34 | ||
35 | def decode_dual_bytes(sio0, sio1): | |
36 | # Given a byte in SIO0 (MOSI) of even bits and a byte in | |
37 | # SIO1 (MISO) of odd bits, return a tuple of two bytes. | |
38 | def combine_byte(even, odd): | |
39 | result = 0 | |
40 | for bit in range(4): | |
41 | if even & (1 << bit): | |
42 | result |= 1 << (bit*2) | |
43 | if odd & (1 << bit): | |
44 | result |= 1 << ((bit*2) + 1) | |
45 | return result | |
46 | return (combine_byte(sio0 >> 4, sio1 >> 4), combine_byte(sio0, sio1)) | |
47 | ||
48 | def decode_status_reg(data): | |
49 | # TODO: Additional per-bit(s) self.put() calls with correct start/end. | |
50 | ||
51 | # Bits[0:0]: WIP (write in progress) | |
52 | s = 'W' if (data & (1 << 0)) else 'No w' | |
53 | ret = '%srite operation in progress.\n' % s | |
54 | ||
55 | # Bits[1:1]: WEL (write enable latch) | |
56 | s = '' if (data & (1 << 1)) else 'not ' | |
57 | ret += 'Internal write enable latch is %sset.\n' % s | |
58 | ||
59 | # Bits[5:2]: Block protect bits | |
60 | # TODO: More detailed decoding (chip-dependent). | |
61 | ret += 'Block protection bits (BP3-BP0): 0x%x.\n' % ((data & 0x3c) >> 2) | |
62 | ||
63 | # Bits[6:6]: Continuously program mode (CP mode) | |
64 | s = '' if (data & (1 << 6)) else 'not ' | |
65 | ret += 'Device is %sin continuously program mode (CP mode).\n' % s | |
66 | ||
67 | # Bits[7:7]: SRWD (status register write disable) | |
68 | s = 'not ' if (data & (1 << 7)) else '' | |
69 | ret += 'Status register writes are %sallowed.\n' % s | |
70 | ||
71 | return ret | |
72 | ||
73 | class Decoder(srd.Decoder): | |
74 | api_version = 2 | |
75 | id = 'spiflash' | |
76 | name = 'SPI flash' | |
77 | longname = 'SPI flash chips' | |
78 | desc = 'xx25 series SPI (NOR) flash chip protocol.' | |
79 | license = 'gplv2+' | |
80 | inputs = ['spi'] | |
81 | outputs = ['spiflash'] | |
82 | annotations = cmd_annotation_classes() + ( | |
83 | ('bit', 'Bit'), | |
84 | ('field', 'Field'), | |
85 | ('warning', 'Warning'), | |
86 | ) | |
87 | annotation_rows = ( | |
88 | ('bits', 'Bits', (L + 0,)), | |
89 | ('fields', 'Fields', (L + 1,)), | |
90 | ('commands', 'Commands', tuple(range(len(cmds)))), | |
91 | ('warnings', 'Warnings', (L + 2,)), | |
92 | ) | |
93 | options = ( | |
94 | {'id': 'chip', 'desc': 'Chip', 'default': tuple(chips.keys())[0], | |
95 | 'values': tuple(chips.keys())}, | |
96 | {'id': 'format', 'desc': 'Data format', 'default': 'hex', | |
97 | 'values': ('hex', 'ascii')}, | |
98 | ) | |
99 | ||
100 | def __init__(self): | |
101 | self.device_id = -1 | |
102 | self.on_end_transaction = None | |
103 | self.end_current_transaction() | |
104 | ||
105 | # Build dict mapping command keys to handler functions. Each | |
106 | # command in 'cmds' (defined in lists.py) has a matching | |
107 | # handler self.handle_<shortname>. | |
108 | def get_handler(cmd): | |
109 | s = 'handle_%s' % cmds[cmd][0].lower().replace('/', '_') | |
110 | return getattr(self, s) | |
111 | self.cmd_handlers = dict((cmd, get_handler(cmd)) for cmd in cmds.keys()) | |
112 | ||
113 | def end_current_transaction(self): | |
114 | if self.on_end_transaction is not None: # Callback for CS# transition. | |
115 | self.on_end_transaction() | |
116 | self.on_end_transaction = None | |
117 | self.state = None | |
118 | self.cmdstate = 1 | |
119 | self.addr = 0 | |
120 | self.data = [] | |
121 | ||
122 | def start(self): | |
123 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
124 | self.chip = chips[self.options['chip']] | |
125 | self.vendor = self.options['chip'].split('_')[0] | |
126 | ||
127 | def putx(self, data): | |
128 | # Simplification, most annotations span exactly one SPI byte/packet. | |
129 | self.put(self.ss, self.es, self.out_ann, data) | |
130 | ||
131 | def putf(self, data): | |
132 | self.put(self.ss_field, self.es_field, self.out_ann, data) | |
133 | ||
134 | def putc(self, data): | |
135 | self.put(self.ss_cmd, self.es_cmd, self.out_ann, data) | |
136 | ||
137 | def device(self): | |
138 | return device_name[self.vendor].get(self.device_id, 'Unknown') | |
139 | ||
140 | def vendor_device(self): | |
141 | return '%s %s' % (self.chip['vendor'], self.device()) | |
142 | ||
143 | def cmd_ann_list(self): | |
144 | x, s = cmds[self.state][0], cmds[self.state][1] | |
145 | return ['Command: %s (%s)' % (s, x), 'Command: %s' % s, | |
146 | 'Cmd: %s' % s, 'Cmd: %s' % x, x] | |
147 | ||
148 | def cmd_vendor_dev_list(self): | |
149 | c, d = cmds[self.state], 'Device = %s' % self.vendor_device() | |
150 | return ['%s (%s): %s' % (c[1], c[0], d), '%s: %s' % (c[1], d), | |
151 | '%s: %s' % (c[0], d), d, self.vendor_device()] | |
152 | ||
153 | def emit_cmd_byte(self): | |
154 | self.ss_cmd = self.ss | |
155 | self.putx([Ann.FIELD, self.cmd_ann_list()]) | |
156 | self.addr = 0 | |
157 | ||
158 | def emit_addr_bytes(self, mosi): | |
159 | self.addr |= (mosi << ((4 - self.cmdstate) * 8)) | |
160 | b = ((3 - (self.cmdstate - 2)) * 8) - 1 | |
161 | self.putx([Ann.BIT, | |
162 | ['Address bits %d..%d: 0x%02x' % (b, b - 7, mosi), | |
163 | 'Addr bits %d..%d: 0x%02x' % (b, b - 7, mosi), | |
164 | 'Addr bits %d..%d' % (b, b - 7), 'A%d..A%d' % (b, b - 7)]]) | |
165 | if self.cmdstate == 2: | |
166 | self.ss_field = self.ss | |
167 | if self.cmdstate == 4: | |
168 | self.es_field = self.es | |
169 | self.putf([Ann.FIELD, ['Address: 0x%06x' % self.addr, | |
170 | 'Addr: 0x%06x' % self.addr, '0x%06x' % self.addr]]) | |
171 | ||
172 | def handle_wren(self, mosi, miso): | |
173 | self.putx([Ann.WREN, self.cmd_ann_list()]) | |
174 | self.state = None | |
175 | ||
176 | def handle_wrdi(self, mosi, miso): | |
177 | pass # TODO | |
178 | ||
179 | def handle_rdid(self, mosi, miso): | |
180 | if self.cmdstate == 1: | |
181 | # Byte 1: Master sends command ID. | |
182 | self.emit_cmd_byte() | |
183 | elif self.cmdstate == 2: | |
184 | # Byte 2: Slave sends the JEDEC manufacturer ID. | |
185 | self.putx([Ann.FIELD, ['Manufacturer ID: 0x%02x' % miso]]) | |
186 | elif self.cmdstate == 3: | |
187 | # Byte 3: Slave sends the memory type. | |
188 | self.putx([Ann.FIELD, ['Memory type: 0x%02x' % miso]]) | |
189 | elif self.cmdstate == 4: | |
190 | # Byte 4: Slave sends the device ID. | |
191 | self.device_id = miso | |
192 | self.putx([Ann.FIELD, ['Device ID: 0x%02x' % miso]]) | |
193 | ||
194 | if self.cmdstate == 4: | |
195 | self.es_cmd = self.es | |
196 | self.putc([Ann.RDID, self.cmd_vendor_dev_list()]) | |
197 | self.state = None | |
198 | else: | |
199 | self.cmdstate += 1 | |
200 | ||
201 | def handle_rdsr(self, mosi, miso): | |
202 | # Read status register: Master asserts CS#, sends RDSR command, | |
203 | # reads status register byte. If CS# is kept asserted, the status | |
204 | # register can be read continuously / multiple times in a row. | |
205 | # When done, the master de-asserts CS# again. | |
206 | if self.cmdstate == 1: | |
207 | # Byte 1: Master sends command ID. | |
208 | self.emit_cmd_byte() | |
209 | elif self.cmdstate >= 2: | |
210 | # Bytes 2-x: Slave sends status register as long as master clocks. | |
211 | self.es_cmd = self.es | |
212 | self.putx([Ann.BIT, [decode_status_reg(miso)]]) | |
213 | self.putx([Ann.FIELD, ['Status register']]) | |
214 | self.putc([Ann.RDSR, self.cmd_ann_list()]) | |
215 | self.cmdstate += 1 | |
216 | ||
217 | def handle_rdsr2(self, mosi, miso): | |
218 | # Read status register 2: Master asserts CS#, sends RDSR2 command, | |
219 | # reads status register 2 byte. If CS# is kept asserted, the status | |
220 | # register 2 can be read continuously / multiple times in a row. | |
221 | # When done, the master de-asserts CS# again. | |
222 | if self.cmdstate == 1: | |
223 | # Byte 1: Master sends command ID. | |
224 | self.emit_cmd_byte() | |
225 | elif self.cmdstate >= 2: | |
226 | # Bytes 2-x: Slave sends status register 2 as long as master clocks. | |
227 | self.es_cmd = self.es | |
228 | # TODO: Decode status register 2 correctly. | |
229 | self.putx([Ann.BIT, [decode_status_reg(miso)]]) | |
230 | self.putx([Ann.FIELD, ['Status register 2']]) | |
231 | self.putc([Ann.RDSR2, self.cmd_ann_list()]) | |
232 | self.cmdstate += 1 | |
233 | ||
234 | def handle_wrsr(self, mosi, miso): | |
235 | # Write status register: Master asserts CS#, sends WRSR command, | |
236 | # writes 1 or 2 status register byte(s). | |
237 | # When done, the master de-asserts CS# again. If this doesn't happen | |
238 | # the WRSR command will not be executed. | |
239 | if self.cmdstate == 1: | |
240 | # Byte 1: Master sends command ID. | |
241 | self.emit_cmd_byte() | |
242 | elif self.cmdstate == 2: | |
243 | # Byte 2: Master sends status register 1. | |
244 | self.putx([Ann.BIT, [decode_status_reg(miso)]]) | |
245 | self.putx([Ann.FIELD, ['Status register 1']]) | |
246 | elif self.cmdstate == 3: | |
247 | # Byte 3: Master sends status register 2. | |
248 | # TODO: Decode status register 2 correctly. | |
249 | self.putx([Ann.BIT, [decode_status_reg(miso)]]) | |
250 | self.putx([Ann.FIELD, ['Status register 2']]) | |
251 | self.es_cmd = self.es | |
252 | self.putc([Ann.WRSR, self.cmd_ann_list()]) | |
253 | self.cmdstate += 1 | |
254 | ||
255 | def handle_read(self, mosi, miso): | |
256 | # Read data bytes: Master asserts CS#, sends READ command, sends | |
257 | # 3-byte address, reads >= 1 data bytes, de-asserts CS#. | |
258 | if self.cmdstate == 1: | |
259 | # Byte 1: Master sends command ID. | |
260 | self.emit_cmd_byte() | |
261 | elif self.cmdstate in (2, 3, 4): | |
262 | # Bytes 2/3/4: Master sends read address (24bits, MSB-first). | |
263 | self.emit_addr_bytes(mosi) | |
264 | elif self.cmdstate >= 5: | |
265 | # Bytes 5-x: Master reads data bytes (until CS# de-asserted). | |
266 | self.es_field = self.es # Will be overwritten for each byte. | |
267 | if self.cmdstate == 5: | |
268 | self.ss_field = self.ss | |
269 | self.on_end_transaction = lambda: self.output_data_block('Data', Ann.READ) | |
270 | self.data.append(miso) | |
271 | self.cmdstate += 1 | |
272 | ||
273 | def handle_fast_read(self, mosi, miso): | |
274 | # Fast read: Master asserts CS#, sends FAST READ command, sends | |
275 | # 3-byte address + 1 dummy byte, reads >= 1 data bytes, de-asserts CS#. | |
276 | if self.cmdstate == 1: | |
277 | # Byte 1: Master sends command ID. | |
278 | self.emit_cmd_byte() | |
279 | elif self.cmdstate in (2, 3, 4): | |
280 | # Bytes 2/3/4: Master sends read address (24bits, MSB-first). | |
281 | self.emit_addr_bytes(mosi) | |
282 | elif self.cmdstate == 5: | |
283 | self.putx([Ann.BIT, ['Dummy byte: 0x%02x' % mosi]]) | |
284 | elif self.cmdstate >= 6: | |
285 | # Bytes 6-x: Master reads data bytes (until CS# de-asserted). | |
286 | self.es_field = self.es # Will be overwritten for each byte. | |
287 | if self.cmdstate == 6: | |
288 | self.ss_field = self.ss | |
289 | self.on_end_transaction = lambda: self.output_data_block('Data', Ann.FAST_READ) | |
290 | self.data.append(miso) | |
291 | self.cmdstate += 1 | |
292 | ||
293 | def handle_2read(self, mosi, miso): | |
294 | # 2x I/O read (fast read dual I/O): Master asserts CS#, sends 2READ | |
295 | # command, sends 3-byte address + 1 dummy byte, reads >= 1 data bytes, | |
296 | # de-asserts CS#. All data after the command is sent via two I/O pins. | |
297 | # MOSI = SIO0 = even bits, MISO = SIO1 = odd bits. | |
298 | if self.cmdstate != 1: | |
299 | b1, b2 = decode_dual_bytes(mosi, miso) | |
300 | if self.cmdstate == 1: | |
301 | # Byte 1: Master sends command ID. | |
302 | self.emit_cmd_byte() | |
303 | elif self.cmdstate == 2: | |
304 | # Bytes 2/3(/4): Master sends read address (24bits, MSB-first). | |
305 | # Handle bytes 2 and 3 here. | |
306 | self.emit_addr_bytes(b1) | |
307 | self.cmdstate = 3 | |
308 | self.emit_addr_bytes(b2) | |
309 | elif self.cmdstate == 4: | |
310 | # Byte 5: Dummy byte. Also handle byte 4 (address LSB) here. | |
311 | self.emit_addr_bytes(b1) | |
312 | self.cmdstate = 5 | |
313 | self.putx([Ann.BIT, ['Dummy byte: 0x%02x' % b2]]) | |
314 | elif self.cmdstate >= 6: | |
315 | # Bytes 6-x: Master reads data bytes (until CS# de-asserted). | |
316 | self.es_field = self.es # Will be overwritten for each byte. | |
317 | if self.cmdstate == 6: | |
318 | self.ss_field = self.ss | |
319 | self.on_end_transaction = lambda: self.output_data_block('Data', Ann.READ2X) | |
320 | self.data.append(b1) | |
321 | self.data.append(b2) | |
322 | self.cmdstate += 1 | |
323 | ||
324 | # TODO: Warn/abort if we don't see the necessary amount of bytes. | |
325 | # TODO: Warn if WREN was not seen before. | |
326 | def handle_se(self, mosi, miso): | |
327 | if self.cmdstate == 1: | |
328 | # Byte 1: Master sends command ID. | |
329 | self.emit_cmd_byte() | |
330 | elif self.cmdstate in (2, 3, 4): | |
331 | # Bytes 2/3/4: Master sends sector address (24bits, MSB-first). | |
332 | self.emit_addr_bytes(mosi) | |
333 | ||
334 | if self.cmdstate == 4: | |
335 | self.es_cmd = self.es | |
336 | d = 'Erase sector %d (0x%06x)' % (self.addr, self.addr) | |
337 | self.putc([Ann.SE, [d]]) | |
338 | # TODO: Max. size depends on chip, check that too if possible. | |
339 | if self.addr % 4096 != 0: | |
340 | # Sector addresses must be 4K-aligned (same for all 3 chips). | |
341 | self.putc([Ann.WARN, ['Warning: Invalid sector address!']]) | |
342 | self.state = None | |
343 | else: | |
344 | self.cmdstate += 1 | |
345 | ||
346 | def handle_be(self, mosi, miso): | |
347 | pass # TODO | |
348 | ||
349 | def handle_ce(self, mosi, miso): | |
350 | pass # TODO | |
351 | ||
352 | def handle_ce2(self, mosi, miso): | |
353 | pass # TODO | |
354 | ||
355 | def handle_pp(self, mosi, miso): | |
356 | # Page program: Master asserts CS#, sends PP command, sends 3-byte | |
357 | # page address, sends >= 1 data bytes, de-asserts CS#. | |
358 | if self.cmdstate == 1: | |
359 | # Byte 1: Master sends command ID. | |
360 | self.emit_cmd_byte() | |
361 | elif self.cmdstate in (2, 3, 4): | |
362 | # Bytes 2/3/4: Master sends page address (24bits, MSB-first). | |
363 | self.emit_addr_bytes(mosi) | |
364 | elif self.cmdstate >= 5: | |
365 | # Bytes 5-x: Master sends data bytes (until CS# de-asserted). | |
366 | self.es_field = self.es # Will be overwritten for each byte. | |
367 | if self.cmdstate == 5: | |
368 | self.ss_field = self.ss | |
369 | self.on_end_transaction = lambda: self.output_data_block('Data', Ann.PP) | |
370 | self.data.append(mosi) | |
371 | self.cmdstate += 1 | |
372 | ||
373 | def handle_cp(self, mosi, miso): | |
374 | pass # TODO | |
375 | ||
376 | def handle_dp(self, mosi, miso): | |
377 | pass # TODO | |
378 | ||
379 | def handle_rdp_res(self, mosi, miso): | |
380 | if self.cmdstate == 1: | |
381 | # Byte 1: Master sends command ID. | |
382 | self.emit_cmd_byte() | |
383 | elif self.cmdstate in (2, 3, 4): | |
384 | # Bytes 2/3/4: Master sends three dummy bytes. | |
385 | self.putx([Ann.FIELD, ['Dummy byte: %02x' % mosi]]) | |
386 | elif self.cmdstate == 5: | |
387 | # Byte 5: Slave sends device ID. | |
388 | self.es_cmd = self.es | |
389 | self.device_id = miso | |
390 | self.putx([Ann.FIELD, ['Device ID: %s' % self.device()]]) | |
391 | d = 'Device = %s' % self.vendor_device() | |
392 | self.putc([Ann.RDP_RES, self.cmd_vendor_dev_list()]) | |
393 | self.state = None | |
394 | self.cmdstate += 1 | |
395 | ||
396 | def handle_rems(self, mosi, miso): | |
397 | if self.cmdstate == 1: | |
398 | # Byte 1: Master sends command ID. | |
399 | self.emit_cmd_byte() | |
400 | elif self.cmdstate in (2, 3): | |
401 | # Bytes 2/3: Master sends two dummy bytes. | |
402 | self.putx([Ann.FIELD, ['Dummy byte: 0x%02x' % mosi]]) | |
403 | elif self.cmdstate == 4: | |
404 | # Byte 4: Master sends 0x00 or 0x01. | |
405 | # 0x00: Master wants manufacturer ID as first reply byte. | |
406 | # 0x01: Master wants device ID as first reply byte. | |
407 | self.manufacturer_id_first = True if (mosi == 0x00) else False | |
408 | d = 'manufacturer' if (mosi == 0x00) else 'device' | |
409 | self.putx([Ann.FIELD, ['Master wants %s ID first' % d]]) | |
410 | elif self.cmdstate == 5: | |
411 | # Byte 5: Slave sends manufacturer ID (or device ID). | |
412 | self.ids = [miso] | |
413 | d = 'Manufacturer' if self.manufacturer_id_first else 'Device' | |
414 | self.putx([Ann.FIELD, ['%s ID: 0x%02x' % (d, miso)]]) | |
415 | elif self.cmdstate == 6: | |
416 | # Byte 6: Slave sends device ID (or manufacturer ID). | |
417 | self.ids.append(miso) | |
418 | d = 'Device' if self.manufacturer_id_first else 'Manufacturer' | |
419 | self.putx([Ann.FIELD, ['%s ID: 0x%02x' % (d, miso)]]) | |
420 | ||
421 | if self.cmdstate == 6: | |
422 | id = self.ids[1] if self.manufacturer_id_first else self.ids[0] | |
423 | self.device_id = id | |
424 | self.es_cmd = self.es | |
425 | self.putc([Ann.REMS, self.cmd_vendor_dev_list()]) | |
426 | self.state = None | |
427 | else: | |
428 | self.cmdstate += 1 | |
429 | ||
430 | def handle_rems2(self, mosi, miso): | |
431 | pass # TODO | |
432 | ||
433 | def handle_enso(self, mosi, miso): | |
434 | pass # TODO | |
435 | ||
436 | def handle_exso(self, mosi, miso): | |
437 | pass # TODO | |
438 | ||
439 | def handle_rdscur(self, mosi, miso): | |
440 | pass # TODO | |
441 | ||
442 | def handle_wrscur(self, mosi, miso): | |
443 | pass # TODO | |
444 | ||
445 | def handle_esry(self, mosi, miso): | |
446 | pass # TODO | |
447 | ||
448 | def handle_dsry(self, mosi, miso): | |
449 | pass # TODO | |
450 | ||
451 | def output_data_block(self, label, idx): | |
452 | # Print accumulated block of data | |
453 | # (called on CS# de-assert via self.on_end_transaction callback). | |
454 | self.es_cmd = self.es # End on the CS# de-assert sample. | |
455 | if self.options['format'] == 'hex': | |
456 | s = ' '.join([('%02x' % b) for b in self.data]) | |
457 | else: | |
458 | s = ''.join(map(chr, self.data)) | |
459 | self.putf([Ann.FIELD, ['%s (%d bytes)' % (label, len(self.data))]]) | |
460 | self.putc([idx, ['%s (addr 0x%06x, %d bytes): %s' % \ | |
461 | (cmds[self.state][1], self.addr, len(self.data), s)]]) | |
462 | ||
463 | def decode(self, ss, es, data): | |
464 | ptype, mosi, miso = data | |
465 | ||
466 | self.ss, self.es = ss, es | |
467 | ||
468 | if ptype == 'CS-CHANGE': | |
469 | self.end_current_transaction() | |
470 | ||
471 | if ptype != 'DATA': | |
472 | return | |
473 | ||
474 | # If we encountered a known chip command, enter the resp. state. | |
475 | if self.state is None: | |
476 | self.state = mosi | |
477 | self.cmdstate = 1 | |
478 | ||
479 | # Handle commands. | |
480 | try: | |
481 | self.cmd_handlers[self.state](mosi, miso) | |
482 | except KeyError: | |
483 | self.putx([Ann.BIT, ['Unknown command: 0x%02x' % mosi]]) | |
484 | self.state = None |