2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2019 Jiahao Li <reg@ljh.me>
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:
13 ## The above copyright notice and this permission notice shall be included in all
14 ## copies or substantial portions of the Software.
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
24 import sigrokdecode as srd
26 OPCODE_MASK = 0b11100000
27 REG_ADDR_MASK = 0b00011111
30 0b00000000: '_process_rcr',
31 0b00100000: '_process_rbm',
32 0b01000000: '_process_wcr',
33 0b01100000: '_process_wbm',
34 0b10000000: '_process_bfs',
35 0b10100000: '_process_bfc',
36 0b11100000: '_process_src',
53 BIT_ECON1_BSEL0 = 0b00000001
54 BIT_ECON1_BSEL1 = 0b00000010
195 class Decoder(srd.Decoder):
199 longname = 'Microchip ENC28J60'
200 desc = 'Microchip ENC28J60 10Base-T Ethernet controller protocol.'
203 outputs = ['enc28j60']
204 tags = ['Embedded/industrial', 'Networking']
206 ('rcr', 'Read Control Register'),
207 ('rbm', 'Read Buffer Memory'),
208 ('wcr', 'Write Control Register'),
209 ('wbm', 'Write Buffer Memory'),
210 ('bfs', 'Bit Field Set'),
211 ('bfc', 'Bit Field Clear'),
212 ('src', 'System Reset Command'),
214 ('reg-addr', 'Register Address'),
215 ('warning', 'Warning'),
218 ('commands', 'Commands',
219 (ANN_RCR, ANN_RBM, ANN_WCR, ANN_WBM, ANN_BFS, ANN_BFC, ANN_SRC)),
220 ('fields', 'Fields', (ANN_DATA, ANN_REG_ADDR)),
221 ('warnings', 'Warnings', (ANN_WARNING,)),
231 self.command_start = None
232 self.command_end = None
238 self.ann = self.register(srd.OUTPUT_ANN)
240 def _process_command(self):
241 if len(self.mosi) == 0:
245 header = self.mosi[0]
246 opcode = header & OPCODE_MASK
248 if opcode not in OPCODE_HANDLERS:
249 self._put_command_warning("Unknown opcode.")
253 getattr(self, OPCODE_HANDLERS[opcode])()
257 def _get_register_name(self, reg_addr):
258 if (self.bsel0 is None) or (self.bsel1 is None):
259 # We don't know the bank we're in yet.
262 bank = (self.bsel1 << 1) + self.bsel0
263 return REGS[bank][reg_addr]
265 def _put_register_header(self):
266 reg_addr = self.mosi[0] & REG_ADDR_MASK
267 reg_name = self._get_register_name(reg_addr)
270 # We don't know the bank we're in yet.
271 self.put(self.command_start, self.ranges[1][0], self.ann, [
274 'Reg Bank ? Addr 0x{0:02X}'.format(reg_addr),
275 '?:{0:02X}'.format(reg_addr),
277 self.put(self.command_start, self.ranges[1][0], self.ann, [
280 'Warning: Register bank not known yet.',
284 self.put(self.command_start, self.ranges[1][0], self.ann, [
287 'Reg {0}'.format(reg_name),
288 '{0}'.format(reg_name),
291 if (reg_name == '-') or (reg_name == 'Reserved'):
292 self.put(self.command_start, self.ranges[1][0], self.ann, [
295 'Warning: Invalid register accessed.',
299 def _put_data_byte(self, data, byte_index, binary=False):
300 if byte_index == len(self.mosi) - 1:
301 end_sample = self.command_end
303 end_sample = self.ranges[byte_index + 1][0]
306 self.put(self.ranges[byte_index][0], end_sample, self.ann, [
309 'Data 0b{0:08b}'.format(data),
310 '{0:08b}'.format(data),
313 self.put(self.ranges[byte_index][0], end_sample, self.ann, [
316 'Data 0x{0:02X}'.format(data),
317 '{0:02X}'.format(data),
320 def _put_command_warning(self, reason):
321 self.put(self.command_start, self.command_end, self.ann, [
324 'Warning: {0}'.format(reason),
328 def _process_rcr(self):
329 self.put(self.command_start, self.command_end,
330 self.ann, [ANN_RCR, ['Read Control Register', 'RCR']])
332 if (len(self.mosi) != 2) and (len(self.mosi) != 3):
333 self._put_command_warning('Invalid command length.')
336 self._put_register_header()
338 reg_name = self._get_register_name(self.mosi[0] & REG_ADDR_MASK)
340 # We can't tell if we're accessing MAC/MII registers or not
341 # Let's trust the user in this case.
344 if (reg_name[0] == 'M') and (len(self.mosi) != 3):
345 self._put_command_warning('Attempting to read a MAC/MII '
346 + 'register without using the dummy byte.')
349 if (reg_name[0] != 'M') and (len(self.mosi) != 2):
350 self._put_command_warning('Attempting to read a non-MAC/MII '
351 + 'register using the dummy byte.')
354 if len(self.mosi) == 2:
355 self._put_data_byte(self.miso[1], 1)
357 self.put(self.ranges[1][0], self.ranges[2][0], self.ann, [
363 self._put_data_byte(self.miso[2], 2)
365 def _process_rbm(self):
366 if self.mosi[0] != 0b00111010:
367 self._put_command_warning('Invalid header byte.')
370 self.put(self.command_start, self.command_end, self.ann, [
373 'Read Buffer Memory: Length {0}'.format(
378 for i in range(1, len(self.miso)):
379 self._put_data_byte(self.miso[i], i)
381 def _process_wcr(self):
382 self.put(self.command_start, self.command_end,
383 self.ann, [ANN_WCR, ['Write Control Register', 'WCR']])
385 if len(self.mosi) != 2:
386 self._put_command_warning('Invalid command length.')
389 self._put_register_header()
390 self._put_data_byte(self.mosi[1], 1)
392 if self.mosi[0] & REG_ADDR_MASK == REG_ADDR_ECON1:
393 self.bsel0 = (self.mosi[1] & BIT_ECON1_BSEL0) >> 0
394 self.bsel1 = (self.mosi[1] & BIT_ECON1_BSEL1) >> 1
396 def _process_wbm(self):
397 if self.mosi[0] != 0b01111010:
398 self._put_command_warning('Invalid header byte.')
401 self.put(self.command_start, self.command_end, self.ann, [
404 'Write Buffer Memory: Length {0}'.format(
409 for i in range(1, len(self.mosi)):
410 self._put_data_byte(self.mosi[i], i)
412 def _process_bfc(self):
413 self.put(self.command_start, self.command_end,
414 self.ann, [ANN_BFC, ['Bit Field Clear', 'BFC']])
416 if len(self.mosi) != 2:
417 self._put_command_warning('Invalid command length.')
420 self._put_register_header()
421 self._put_data_byte(self.mosi[1], 1, True)
423 if self.mosi[0] & REG_ADDR_MASK == REG_ADDR_ECON1:
424 if self.mosi[1] & BIT_ECON1_BSEL0:
426 if self.mosi[1] & BIT_ECON1_BSEL1:
429 def _process_bfs(self):
430 self.put(self.command_start, self.command_end,
431 self.ann, [ANN_BFS, ['Bit Field Set', 'BFS']])
433 if len(self.mosi) != 2:
434 self._put_command_warning('Invalid command length.')
437 self._put_register_header()
438 self._put_data_byte(self.mosi[1], 1, True)
440 if self.mosi[0] & REG_ADDR_MASK == REG_ADDR_ECON1:
441 if self.mosi[1] & BIT_ECON1_BSEL0:
443 if self.mosi[1] & BIT_ECON1_BSEL1:
446 def _process_src(self):
447 self.put(self.command_start, self.command_end,
448 self.ann, [ANN_SRC, ['System Reset Command', 'SRC']])
450 if len(self.mosi) != 1:
451 self._put_command_warning('Invalid command length.')
457 def decode(self, ss, es, data):
458 ptype, data1, data2 = data
460 if ptype == 'CS-CHANGE':
465 self.command_start = ss
471 self.command_end = es
472 self._process_command()
473 elif ptype == 'DATA':
474 mosi, miso = data1, data2
476 self.mosi.append(mosi)
477 self.miso.append(miso)
478 self.ranges.append((ss, es))