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