2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2016 Rudolf Reuter <reuterru@arcor.de>
5 ## Copyright (C) 2017 Marcus Comstedt <marcus@mc.pp.se>
6 ## Copyright (C) 2019 Gerhard Sittig <gerhard.sittig@gmx.net>
8 ## This program is free software; you can redistribute it and/or modify
9 ## it under the terms of the GNU General Public License as published by
10 ## the Free Software Foundation; either version 2 of the License, or
11 ## (at your option) any later version.
13 ## This program is distributed in the hope that it will be useful,
14 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ## GNU General Public License for more details.
18 ## You should have received a copy of the GNU General Public License
19 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
22 # This file was created from earlier implementations of the 'gpib' and
23 # the 'iec' protocol decoders. It combines the parallel and the serial
24 # transmission variants in a single instance with optional inputs for
25 # maximum code re-use.
28 # - Extend annotations for improved usability.
29 # - Keep talkers' data streams on separate annotation rows? Is this useful
30 # here at the GPIB level, or shall stacked decoders dispatch these? May
31 # depend on how often captures get inspected which involve multiple peers.
32 # - Make serial bit annotations optional? Could slow down interactive
33 # exploration for long captures (see USB).
34 # - Move the inlined Commodore IEC peripherals support to a stacked decoder
35 # when more peripherals get added.
36 # - SCPI over GPIB may "represent somewhat naturally" here already when
37 # text lines are a single run of data at the GPIB layer (each line between
38 # the address spec and either EOI or ATN). So a stacked SCPI decoder may
39 # only become necessary when the text lines' content shall get inspected.
41 import sigrokdecode as srd
42 from common.srdhelper import bitpack
45 OUTPUT_PYTHON format for stacked decoders:
47 General packet format:
48 [<ptype>, <addr>, <pdata>]
50 This is the list of <ptype>s and their respective <pdata> values:
52 Raw bits and bytes at the physical transport level:
53 - 'IEC_BIT': <addr> is not applicable, <pdata> is the transport's bit value.
54 - 'GPIB_RAW': <addr> is not applicable, <pdata> is the transport's
55 byte value. Data bytes are in the 0x00-0xff range, command/address
56 bytes are in the 0x100-0x1ff range.
58 GPIB level byte fields (commands, addresses, pieces of data):
59 - 'COMMAND': <addr> is not applicable, <pdata> is the command's byte value.
60 - 'LISTEN': <addr> is the listener address (0-30), <pdata> is the raw
61 byte value (including the 0x20 offset).
62 - 'TALK': <addr> is the talker address (0-30), <pdata> is the raw byte
63 value (including the 0x40 offset).
64 - 'SECONDARY': <addr> is the secondary address (0-31), <pdata> is the
65 raw byte value (including the 0x60 offset).
66 - 'MSB_SET': <addr> as well as <pdata> are the raw byte value (including
67 the 0x80 offset). This usually does not happen for GPIB bytes with ATN
68 active, but was observed with the IEC bus and Commodore floppy drives,
69 when addressing channels within the device.
70 - 'DATA_BYTE': <addr> is the talker address (when available), <pdata>
71 is the raw data byte (transport layer, ATN inactive).
73 Extracted payload information (peers and their communicated data):
74 - 'TALK_LISTEN': <addr> is the current talker, <pdata> is the list of
75 current listeners. These updates for the current "connected peers"
76 are sent when the set of peers changes, i.e. after talkers/listeners
77 got selected or deselected. Of course the data only covers what could
78 be gathered from the input data. Some controllers may not explicitly
79 address themselves, or captures may not include an early setup phase.
80 - 'TALKER_BYTES': <addr> is the talker address (when available), <pdata>
81 is the accumulated byte sequence between addressing a talker and EOI,
82 or the next command/address.
83 - 'TALKER_TEXT': <addr> is the talker address (when available), <pdata>
84 is the accumulated text sequence between addressing a talker and EOI,
85 or the next command/address.
88 class ChannelError(Exception):
91 def _format_ann_texts(fmts, **args):
94 return [fmt.format(**args) for fmt in fmts]
97 # Command codes in the 0x00-0x1f range.
98 0x01: ['Go To Local', 'GTL'],
99 0x04: ['Selected Device Clear', 'SDC'],
100 0x05: ['Parallel Poll Configure', 'PPC'],
101 0x08: ['Global Execute Trigger', 'GET'],
102 0x09: ['Take Control', 'TCT'],
103 0x11: ['Local Lock Out', 'LLO'],
104 0x14: ['Device Clear', 'DCL'],
105 0x15: ['Parallel Poll Unconfigure', 'PPU'],
106 0x18: ['Serial Poll Enable', 'SPE'],
107 0x19: ['Serial Poll Disable', 'SPD'],
108 # Unknown type of command.
109 None: ['Unknown command 0x{cmd:02x}', 'command 0x{cmd:02x}', 'cmd {cmd:02x}', 'C{cmd_ord:c}'],
110 # Special listener/talker "addresses" (deselecting previous peers).
111 0x3f: ['Unlisten', 'UNL'],
112 0x5f: ['Untalk', 'UNT'],
116 # Returns a tuple of booleans (or None when not applicable) whether
117 # the raw GPIB byte is: a command, an un-listen, an un-talk command.
118 if b in range(0x00, 0x20):
119 return True, None, None
120 if b in range(0x20, 0x40) and (b & 0x1f) == 31:
121 return True, True, False
122 if b in range(0x40, 0x60) and (b & 0x1f) == 31:
123 return True, False, True
124 return False, None, None
126 def _is_listen_addr(b):
127 if b in range(0x20, 0x40):
131 def _is_talk_addr(b):
132 if b in range(0x40, 0x60):
136 def _is_secondary_addr(b):
137 if b in range(0x60, 0x80):
146 def _get_raw_byte(b, atn):
147 # "Decorate" raw byte values for stacked decoders.
148 return b | 0x100 if atn else b
150 def _get_raw_text(b, atn):
151 return ['{leader}{data:02x}'.format(leader = '/' if atn else '', data = b)]
153 def _get_command_texts(b):
154 fmts = _cmd_table.get(b, None)
155 known = fmts is not None
157 fmts = _cmd_table.get(None, None)
160 return known, _format_ann_texts(fmts, cmd = b, cmd_ord = ord('0') + b)
162 def _get_address_texts(b):
163 laddr = _is_listen_addr(b)
164 taddr = _is_talk_addr(b)
165 saddr = _is_secondary_addr(b)
168 if laddr is not None:
169 fmts = ['Listen {addr:d}', 'L {addr:d}', 'L{addr_ord:c}']
171 elif taddr is not None:
172 fmts = ['Talk {addr:d}', 'T {addr:d}', 'T{addr_ord:c}']
174 elif saddr is not None:
175 fmts = ['Secondary {addr:d}', 'S {addr:d}', 'S{addr_ord:c}']
177 elif msb is not None: # For IEC bus compat.
178 fmts = ['Secondary {addr:d}', 'S {addr:d}', 'S{addr_ord:c}']
180 return _format_ann_texts(fmts, addr = addr, addr_ord = ord('0') + addr)
182 def _get_data_text(b):
183 # TODO Move the table of ASCII control characters to a common location?
184 # TODO Move the "printable with escapes" logic to a common helper?
219 # Yes, exclude 0x7f (DEL) here. It's considered non-printable.
220 if b in range(0x20, 0x7f) and b not in ('[', ']'):
221 return '{:s}'.format(chr(b))
222 elif b in _control_codes:
223 return '[{:s}]'.format(_control_codes[b])
224 # Use a compact yet readable and unambigous presentation for bytes
225 # which contain non-printables. The format that is used here is
226 # compatible with 93xx EEPROM and UART decoders.
227 return '[{:02x}]'.format(b)
230 PIN_DIO1, PIN_DIO2, PIN_DIO3, PIN_DIO4,
231 PIN_DIO5, PIN_DIO6, PIN_DIO7, PIN_DIO8,
232 PIN_EOI, PIN_DAV, PIN_NRFD, PIN_NDAC,
233 PIN_IFC, PIN_SRQ, PIN_ATN, PIN_REN,
239 ANN_RAW_BIT, ANN_RAW_BYTE,
240 ANN_CMD, ANN_LADDR, ANN_TADDR, ANN_SADDR, ANN_DATA,
243 # TODO Want to provide one annotation class per talker address (0-30)?
251 # TODO Want to provide one binary annotation class per talker address (0-30)?
254 class Decoder(srd.Decoder):
258 longname = 'IEEE-488 GPIB/HPIB/IEC'
259 desc = 'IEEE-488 General Purpose Interface Bus (GPIB/HPIB or IEC).'
262 outputs = ['ieee488']
263 tags = ['PC', 'Retro computing']
265 {'id': 'dio1' , 'name': 'DIO1/DATA',
266 'desc': 'Data I/O bit 1, or serial data'},
268 optional_channels = (
269 {'id': 'dio2' , 'name': 'DIO2', 'desc': 'Data I/O bit 2'},
270 {'id': 'dio3' , 'name': 'DIO3', 'desc': 'Data I/O bit 3'},
271 {'id': 'dio4' , 'name': 'DIO4', 'desc': 'Data I/O bit 4'},
272 {'id': 'dio5' , 'name': 'DIO5', 'desc': 'Data I/O bit 5'},
273 {'id': 'dio6' , 'name': 'DIO6', 'desc': 'Data I/O bit 6'},
274 {'id': 'dio7' , 'name': 'DIO7', 'desc': 'Data I/O bit 7'},
275 {'id': 'dio8' , 'name': 'DIO8', 'desc': 'Data I/O bit 8'},
276 {'id': 'eoi', 'name': 'EOI', 'desc': 'End or identify'},
277 {'id': 'dav', 'name': 'DAV', 'desc': 'Data valid'},
278 {'id': 'nrfd', 'name': 'NRFD', 'desc': 'Not ready for data'},
279 {'id': 'ndac', 'name': 'NDAC', 'desc': 'Not data accepted'},
280 {'id': 'ifc', 'name': 'IFC', 'desc': 'Interface clear'},
281 {'id': 'srq', 'name': 'SRQ', 'desc': 'Service request'},
282 {'id': 'atn', 'name': 'ATN', 'desc': 'Attention'},
283 {'id': 'ren', 'name': 'REN', 'desc': 'Remote enable'},
284 {'id': 'clk', 'name': 'CLK', 'desc': 'Serial clock'},
287 {'id': 'iec_periph', 'desc': 'Decode Commodore IEC bus peripherals details',
288 'default': 'no', 'values': ('no', 'yes')},
294 ('laddr', 'Listener address'),
295 ('taddr', 'Talker address'),
296 ('saddr', 'Secondary address'),
297 ('data', 'Data byte'),
299 ('text', 'Talker text'),
300 ('periph', 'IEC bus peripherals'),
304 ('bits', 'IEC bits', (ANN_RAW_BIT,)),
305 ('raws', 'Raw bytes', (ANN_RAW_BYTE,)),
306 ('gpib', 'Commands/data', (ANN_CMD, ANN_LADDR, ANN_TADDR, ANN_SADDR, ANN_DATA,)),
307 ('eois', 'EOI', (ANN_EOI,)),
308 ('texts', 'Talker texts', (ANN_TEXT,)),
309 ('periphs', 'IEC peripherals', (ANN_IEC_PERIPH,)),
310 ('warns', 'Warnings', (ANN_WARN,)),
313 ('raw', 'Raw bytes'),
314 ('data', 'Talker bytes'),
324 self.latch_atn = None
325 self.latch_eoi = None
334 self.last_talker = None
335 self.last_listener = []
336 self.last_iec_addr = None
337 self.last_iec_sec = None
340 self.out_ann = self.register(srd.OUTPUT_ANN)
341 self.out_bin = self.register(srd.OUTPUT_BINARY)
342 self.out_python = self.register(srd.OUTPUT_PYTHON)
344 def putg(self, ss, es, data):
345 self.put(ss, es, self.out_ann, data)
347 def putbin(self, ss, es, data):
348 self.put(ss, es, self.out_bin, data)
350 def putpy(self, ss, es, ptype, addr, pdata):
351 self.put(ss, es, self.out_python, [ptype, addr, pdata])
353 def emit_eoi_ann(self, ss, es):
354 self.putg(ss, es, [ANN_EOI, ['EOI']])
356 def emit_bin_ann(self, ss, es, ann_cls, data):
357 self.putbin(ss, es, [ann_cls, bytes(data)])
359 def emit_data_ann(self, ss, es, ann_cls, data):
360 self.putg(ss, es, [ann_cls, data])
362 def emit_warn_ann(self, ss, es, data):
363 self.putg(ss, es, [ANN_WARN, data])
365 def flush_bytes_text_accu(self):
366 if self.accu_bytes and self.ss_text is not None and self.es_text is not None:
367 self.emit_bin_ann(self.ss_text, self.es_text, BIN_DATA, bytearray(self.accu_bytes))
368 self.putpy(self.ss_text, self.es_text, 'TALKER_BYTES', self.last_talker, bytearray(self.accu_bytes))
370 if self.accu_text and self.ss_text is not None and self.es_text is not None:
371 text = ''.join(self.accu_text)
372 self.emit_data_ann(self.ss_text, self.es_text, ANN_TEXT, [text])
373 self.putpy(self.ss_text, self.es_text, 'TALKER_TEXT', self.last_talker, text)
375 self.ss_text = self.es_text = None
377 def handle_ifc_change(self, ifc):
378 # Track IFC line for parallel input.
379 # Assertion of IFC de-selects all talkers and listeners.
381 self.last_talker = None
382 self.last_listener = []
384 def handle_eoi_change(self, eoi):
385 # Track EOI line for parallel and serial input.
387 self.ss_eoi = self.samplenum
390 self.es_eoi = self.samplenum
391 if self.ss_eoi and self.latch_eoi:
392 self.emit_eoi_ann(self.ss_eoi, self.es_eoi)
393 self.es_text = self.es_eoi
394 self.flush_bytes_text_accu()
395 self.ss_eoi = self.es_eoi = None
398 def handle_atn_change(self, atn):
399 # Track ATN line for parallel and serial input.
402 self.flush_bytes_text_accu()
404 def handle_iec_periph(self, ss, es, addr, sec, data):
405 # The annotation is optional.
406 if self.options['iec_periph'] != 'yes':
408 # Void internal state.
409 if addr is None and sec is None and data is None:
410 self.last_iec_addr = None
411 self.last_iec_sec = None
413 # Grab and evaluate new input.
415 # TODO Add more items here. See the "Device numbering" section
416 # of the https://en.wikipedia.org/wiki/Commodore_bus page.
420 _iec_disk_range = range(8, 16)
422 self.last_iec_addr = addr
423 name = _iec_addr_names.get(addr, None)
425 self.emit_data_ann(ss, es, ANN_IEC_PERIPH, [name])
426 addr = self.last_iec_addr # Simplify subsequent logic.
428 # BEWARE! The secondary address is a full byte and includes
429 # the 0x60 offset, to also work when the MSB was set.
430 self.last_iec_sec = sec
431 subcmd, channel = sec & 0xf0, sec & 0x0f
432 channel_ord = ord('0') + channel
433 if addr is not None and addr in _iec_disk_range:
435 0x60: ['Reopen {ch:d}', 'Re {ch:d}', 'R{ch_ord:c}'],
436 0xe0: ['Close {ch:d}', 'Cl {ch:d}', 'C{ch_ord:c}'],
437 0xf0: ['Open {ch:d}', 'Op {ch:d}', 'O{ch_ord:c}'],
440 texts = _format_ann_texts(subcmd_fmts, ch = channel, ch_ord = channel_ord)
441 self.emit_data_ann(ss, es, ANN_IEC_PERIPH, texts)
442 sec = self.last_iec_sec # Simplify subsequent logic.
444 if addr is None or sec is None:
446 # TODO Process data depending on peripheral type and channel?
448 def handle_data_byte(self):
450 texts = _get_raw_text(b, self.curr_atn)
451 self.emit_data_ann(self.ss_raw, self.es_raw, ANN_RAW_BYTE, texts)
452 self.emit_bin_ann(self.ss_raw, self.es_raw, BIN_RAW, b.to_bytes(1, byteorder='big'))
453 self.putpy(self.ss_raw, self.es_raw, 'GPIB_RAW', None, _get_raw_byte(b, self.curr_atn))
459 is_cmd, is_unl, is_unt = _is_command(b)
460 laddr = _is_listen_addr(b)
461 taddr = _is_talk_addr(b)
462 saddr = _is_secondary_addr(b)
465 known, texts = _get_command_texts(b)
467 warn_texts = ['Unknown GPIB command', 'unknown', 'UNK']
468 self.emit_warn_ann(self.ss_raw, self.es_raw, warn_texts)
470 py_type, py_addr = 'COMMAND', None
472 self.last_listener = []
475 self.last_talker = None
478 upd_iec = True, None, None, None
479 elif laddr is not None:
481 texts = _get_address_texts(b)
483 py_type, py_addr = 'LISTEN', addr
484 if addr == self.last_talker:
485 self.last_talker = None
486 self.last_listener.append(addr)
487 upd_iec = True, addr, None, None
489 elif taddr is not None:
491 texts = _get_address_texts(b)
493 py_type, py_addr = 'TALK', addr
494 if addr in self.last_listener:
495 self.last_listener.remove(addr)
496 self.last_talker = addr
497 upd_iec = True, addr, None, None
499 elif saddr is not None:
501 texts = _get_address_texts(b)
503 upd_iec = True, None, b, None
504 py_type, py_addr = 'SECONDARY', addr
505 elif msb is not None:
506 # These are not really "secondary addresses", but they
507 # are used by the Commodore IEC bus (floppy channels).
508 texts = _get_address_texts(b)
510 upd_iec = True, None, b, None
511 py_type, py_addr = 'MSB_SET', b
512 if ann_cls is not None and texts is not None:
513 self.emit_data_ann(self.ss_raw, self.es_raw, ann_cls, texts)
515 self.handle_iec_periph(self.ss_raw, self.es_raw, upd_iec[1], upd_iec[2], upd_iec[3])
517 self.putpy(self.ss_raw, self.es_raw, py_type, py_addr, b)
519 self.last_listener.sort()
520 self.putpy(self.ss_raw, self.es_raw, 'TALK_LISTEN', self.last_talker, self.last_listener)
522 self.accu_bytes.append(b)
523 text = _get_data_text(b)
524 if not self.accu_text:
525 self.ss_text = self.ss_raw
526 self.accu_text.append(text)
527 self.es_text = self.es_raw
528 self.emit_data_ann(self.ss_raw, self.es_raw, ANN_DATA, [text])
529 self.handle_iec_periph(self.ss_raw, self.es_raw, None, None, b)
530 self.putpy(self.ss_raw, self.es_raw, 'DATA_BYTE', self.last_talker, b)
532 def handle_dav_change(self, dav, data):
534 # Data availability starts when the flag goes active.
535 self.ss_raw = self.samplenum
536 self.curr_raw = bitpack(data)
537 self.latch_atn = self.curr_atn
538 self.latch_eoi = self.curr_eoi
540 # Data availability ends when the flag goes inactive. Handle the
541 # previously captured data byte according to associated flags.
542 self.es_raw = self.samplenum
543 self.handle_data_byte()
544 self.ss_raw = self.es_raw = None
547 def inject_dav_phase(self, ss, es, data):
548 # Inspection of serial input has resulted in one raw byte which
549 # spans a given period of time. Pretend we had seen a DAV active
550 # phase, to re-use code for the parallel transmission.
552 self.curr_raw = bitpack(data)
553 self.latch_atn = self.curr_atn
554 self.latch_eoi = self.curr_eoi
556 self.handle_data_byte()
557 self.ss_raw = self.es_raw = None
560 def invert_pins(self, pins):
561 # All lines (including data bits!) are low active and thus need
562 # to get inverted to receive their logical state (high active,
563 # regular data bit values). Cope with inputs being optional.
564 return [1 - p if p in (0, 1) else p for p in pins]
566 def decode_serial(self, has_clk, has_data_1, has_atn, has_srq):
567 if not has_clk or not has_data_1 or not has_atn:
568 raise ChannelError('IEC bus needs at least ATN and serial CLK and DATA.')
570 # This is a rephrased version of decoders/iec/pd.py:decode().
571 # SRQ was not used there either. Magic numbers were eliminated.
573 STEP_WAIT_READY_TO_SEND,
574 STEP_WAIT_READY_FOR_DATA,
575 STEP_PREP_DATA_TEST_EOI,
576 STEP_CLOCK_DATA_BITS,
579 [{PIN_ATN: 'f'}, {PIN_DATA: 'l', PIN_CLK: 'h'}],
580 [{PIN_ATN: 'f'}, {PIN_DATA: 'h', PIN_CLK: 'h'}, {PIN_CLK: 'l'}],
581 [{PIN_ATN: 'f'}, {PIN_DATA: 'f'}, {PIN_CLK: 'l'}],
582 [{PIN_ATN: 'f'}, {PIN_CLK: 'e'}],
584 step = STEP_WAIT_READY_TO_SEND
589 # Sample input pin values. Keep DATA/CLK in verbatim form to
590 # re-use 'iec' decoder logic. Turn ATN to positive logic for
591 # easier processing. The data bits get handled during byte
593 pins = self.wait(step_wait_conds[step])
594 data, clk = pins[PIN_DATA], pins[PIN_CLK]
595 atn, = self.invert_pins([pins[PIN_ATN]])
598 # Falling edge on ATN, reset step.
599 step = STEP_WAIT_READY_TO_SEND
601 if step == STEP_WAIT_READY_TO_SEND:
602 # Don't use self.matched[1] here since we might come from
603 # a step with different conds due to the code above.
604 if data == 0 and clk == 1:
605 # Rising edge on CLK while DATA is low: Ready to send.
606 step = STEP_WAIT_READY_FOR_DATA
607 elif step == STEP_WAIT_READY_FOR_DATA:
608 if data == 1 and clk == 1:
609 # Rising edge on DATA while CLK is high: Ready for data.
610 ss_byte = self.samplenum
611 self.handle_atn_change(atn)
613 self.handle_eoi_change(False)
615 step = STEP_PREP_DATA_TEST_EOI
617 # CLK low again, transfer aborted.
618 step = STEP_WAIT_READY_TO_SEND
619 elif step == STEP_PREP_DATA_TEST_EOI:
620 if data == 0 and clk == 1:
621 # DATA goes low while CLK is still high, EOI confirmed.
622 self.handle_eoi_change(True)
624 step = STEP_CLOCK_DATA_BITS
625 ss_bit = self.samplenum
626 elif step == STEP_CLOCK_DATA_BITS:
629 # Rising edge on CLK; latch DATA.
632 # Falling edge on CLK; end of bit.
633 es_bit = self.samplenum
634 self.emit_data_ann(ss_bit, es_bit, ANN_RAW_BIT, ['{:d}'.format(bits[-1])])
635 self.putpy(ss_bit, es_bit, 'IEC_BIT', None, bits[-1])
636 ss_bit = self.samplenum
638 es_byte = self.samplenum
639 self.inject_dav_phase(ss_byte, es_byte, bits)
641 self.handle_eoi_change(False)
642 step = STEP_WAIT_READY_TO_SEND
644 def decode_parallel(self, has_data_n, has_dav, has_atn, has_eoi, has_srq):
646 if False in has_data_n or not has_dav or not has_atn:
647 raise ChannelError('IEEE-488 needs at least ATN and DAV and eight DIO lines.')
648 has_ifc = self.has_channel(PIN_IFC)
650 # Capture data lines at the falling edge of DAV, process their
651 # values at rising DAV edge (when data validity ends). Also make
652 # sure to start inspection when the capture happens to start with
653 # low signal levels, i.e. won't include the initial falling edge.
654 # Scan for ATN/EOI edges as well (including the trick which works
655 # around initial pin state).
656 # Map low-active physical transport lines to positive logic here,
657 # to simplify logical inspection/decoding of communicated data,
658 # and to avoid redundancy and inconsistency in later code paths.
660 idx_dav = len(waitcond)
661 waitcond.append({PIN_DAV: 'l'})
662 idx_atn = len(waitcond)
663 waitcond.append({PIN_ATN: 'l'})
666 idx_eoi = len(waitcond)
667 waitcond.append({PIN_EOI: 'l'})
670 idx_ifc = len(waitcond)
671 waitcond.append({PIN_IFC: 'l'})
673 pins = self.wait(waitcond)
674 pins = self.invert_pins(pins)
676 # BEWARE! Order of evaluation does matter. For low samplerate
677 # captures, many edges fall onto the same sample number. So
678 # we process active edges of flags early (before processing
679 # data bits), and inactive edges late (after data got processed).
680 if idx_ifc is not None and self.matched[idx_ifc] and pins[PIN_IFC] == 1:
681 self.handle_ifc_change(pins[PIN_IFC])
682 if idx_eoi is not None and self.matched[idx_eoi] and pins[PIN_EOI] == 1:
683 self.handle_eoi_change(pins[PIN_EOI])
684 if self.matched[idx_atn] and pins[PIN_ATN] == 1:
685 self.handle_atn_change(pins[PIN_ATN])
686 if self.matched[idx_dav]:
687 self.handle_dav_change(pins[PIN_DAV], pins[PIN_DIO1:PIN_DIO8 + 1])
688 if self.matched[idx_atn] and pins[PIN_ATN] == 0:
689 self.handle_atn_change(pins[PIN_ATN])
690 if idx_eoi is not None and self.matched[idx_eoi] and pins[PIN_EOI] == 0:
691 self.handle_eoi_change(pins[PIN_EOI])
692 if idx_ifc is not None and self.matched[idx_ifc] and pins[PIN_IFC] == 0:
693 self.handle_ifc_change(pins[PIN_IFC])
695 waitcond[idx_dav][PIN_DAV] = 'e'
696 waitcond[idx_atn][PIN_ATN] = 'e'
698 waitcond[idx_eoi][PIN_EOI] = 'e'
700 waitcond[idx_ifc][PIN_IFC] = 'e'
703 # The decoder's boilerplate declares some of the input signals as
704 # optional, but only to support both serial and parallel variants.
705 # The CLK signal discriminates the two. For either variant some
706 # of the "optional" signals are not really optional for proper
707 # operation of the decoder. Check these conditions here.
708 has_clk = self.has_channel(PIN_CLK)
709 has_data_1 = self.has_channel(PIN_DIO1)
710 has_data_n = [bool(self.has_channel(pin) for pin in range(PIN_DIO1, PIN_DIO8 + 1))]
711 has_dav = self.has_channel(PIN_DAV)
712 has_atn = self.has_channel(PIN_ATN)
713 has_eoi = self.has_channel(PIN_EOI)
714 has_srq = self.has_channel(PIN_SRQ)
716 self.decode_serial(has_clk, has_data_1, has_atn, has_srq)
718 self.decode_parallel(has_data_n, has_dav, has_atn, has_eoi, has_srq)