2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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 3 of the License, or
9 ## (at your option) any later version.
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.
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/>.
22 # - add short annotations
23 # - Signal level standard field in basic display parameters block
24 # - Additional color point descriptors
25 # - Additional standard timing descriptors
28 import sigrokdecode as srd
31 EDID_HEADER = [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00]
42 # Pre-EDID established timing modes
63 # X:Y display aspect ratios, as used in standard timing modes
75 class Decoder(srd.Decoder):
79 longname = 'Extended Display Identification Data'
80 desc = 'Data structure describing display device capabilities.'
85 ('fields', 'EDID structure fields'),
86 ('sections', 'EDID structure sections'),
89 ('sections', 'Sections', (1,)),
90 ('fields', 'Fields', (0,)),
98 # Received data items, used as an index into samplenum/data
100 # Start/end sample numbers per data item
106 self.out_ann = self.register(srd.OUTPUT_ANN)
108 def decode(self, ss, es, data):
111 # We only care about actual data bytes that are read (for now).
112 if cmd != 'DATA READ':
116 self.sn.append([ss, es])
117 self.cache.append(data)
120 if self.state is None:
121 # Wait for the EDID header
122 if self.cnt >= OFF_VENDOR:
123 if self.cache[-8:] == EDID_HEADER:
124 # Throw away any garbage before the header
125 self.sn = self.sn[-8:]
126 self.cache = self.cache[-8:]
129 self.put(self.sn[0][0], es, self.out_ann,
130 [ANN_SECTIONS, ['Header']])
131 self.put(self.sn[0][0], es, self.out_ann,
132 [ANN_FIELDS, ['Header pattern']])
133 elif self.state == 'edid':
134 if self.cnt == OFF_VERSION:
137 self.decode_serial(-6)
138 self.decode_mfrdate(-2)
139 self.put(self.sn[OFF_VENDOR][0], es, self.out_ann,
140 [ANN_SECTIONS, ['Vendor/product']])
141 elif self.cnt == OFF_BASIC:
142 self.put(self.sn[OFF_VERSION][0], es, self.out_ann,
143 [ANN_SECTIONS, ['EDID Version']])
144 self.put(self.sn[OFF_VERSION][0], self.sn[OFF_VERSION][1],
145 self.out_ann, [ANN_FIELDS,
146 ['Version %d' % self.cache[-2]]])
147 self.put(self.sn[OFF_VERSION+1][0], self.sn[OFF_VERSION+1][1],
148 self.out_ann, [ANN_FIELDS,
149 ['Revision %d' % self.cache[-1]]])
150 elif self.cnt == OFF_CHROM:
151 self.put(self.sn[OFF_BASIC][0], es, self.out_ann,
152 [ANN_SECTIONS, ['Basic display']])
153 self.decode_basicdisplay(-5)
154 elif self.cnt == OFF_EST_TIMING:
155 self.put(self.sn[OFF_CHROM][0], es, self.out_ann,
156 [ANN_SECTIONS, ['Color characteristics']])
157 self.decode_chromaticity(-10)
158 elif self.cnt == OFF_STD_TIMING:
159 self.put(self.sn[OFF_EST_TIMING][0], es, self.out_ann,
160 [ANN_SECTIONS, ['Established timings']])
161 self.decode_est_timing(-3)
162 elif self.cnt == OFF_DET_TIMING:
163 self.put(self.sn[OFF_STD_TIMING][0], es, self.out_ann,
164 [ANN_SECTIONS, ['Standard timings']])
165 self.decode_std_timing(self.cnt - 16)
166 elif self.cnt == OFF_NUM_EXT:
167 self.decode_descriptors(-72)
168 elif self.cnt == OFF_CHECKSUM:
169 self.put(ss, es, self.out_ann,
170 [0, ['Extensions present: %d' % self.cache[self.cnt-1]]])
171 elif self.cnt == OFF_CHECKSUM+1:
174 checksum += self.cache[i]
175 if checksum % 256 == 0:
179 self.put(ss, es, self.out_ann, [0, ['Checksum: %d (%s)' % (
180 self.cache[self.cnt-1], csstr)]])
181 self.state = 'extensions'
182 elif self.state == 'extensions':
185 def ann_field(self, start, end, annotation):
186 self.put(self.sn[start][0], self.sn[end][1],
187 self.out_ann, [ANN_FIELDS, [annotation]])
189 def lookup_pnpid(self, pnpid):
190 pnpid_file = os.path.join(os.path.dirname(__file__), 'pnpids.txt')
191 if os.path.exists(pnpid_file):
192 for line in open(pnpid_file).readlines():
193 if line.find(pnpid + ';') == 0:
194 return line[4:].strip()
197 def decode_vid(self, offset):
198 pnpid = chr(64 + ((self.cache[offset] & 0x7c) >> 2))
199 pnpid += chr(64 + (((self.cache[offset] & 0x03) << 3)
200 | ((self.cache[offset+1] & 0xe0) >> 5)))
201 pnpid += chr(64 + (self.cache[offset+1] & 0x1f))
202 vendor = self.lookup_pnpid(pnpid)
204 pnpid += ' (%s)' % vendor
205 self.ann_field(offset, offset+1, pnpid)
207 def decode_pid(self, offset):
208 pidstr = 'Product 0x%.2x%.2x' % (self.cache[offset+1], self.cache[offset])
209 self.ann_field(offset, offset+1, pidstr)
211 def decode_serial(self, offset):
212 serialnum = (self.cache[offset+3] << 24) \
213 + (self.cache[offset+2] << 16) \
214 + (self.cache[offset+1] << 8) \
219 if not chr(self.cache[offset+3-i]).isalnum():
222 serialstr += chr(self.cache[offset+3-i])
223 serial = serialstr if is_alnum else str(serialnum)
224 self.ann_field(offset, offset+3, 'Serial ' + serial)
226 def decode_mfrdate(self, offset):
228 if self.cache[offset]:
229 datestr += 'week %d, ' % self.cache[offset]
230 datestr += str(1990 + self.cache[offset+1])
232 self.ann_field(offset, offset+1, 'Manufactured ' + datestr)
234 def decode_basicdisplay(self, offset):
235 # Video input definition
236 vid = self.cache[offset]
239 self.ann_field(offset, offset, 'Video input: VESA DFP 1.')
242 sls = (vid & 60) >> 5
243 self.ann_field(offset, offset, 'Signal level standard: %.2x' % sls)
245 self.ann_field(offset, offset, 'Blank-to-black setup expected')
248 syncs += 'separate syncs, '
250 syncs += 'composite syncs, '
252 syncs += 'sync on green, '
254 syncs += 'Vsync serration required, '
256 self.ann_field(offset, offset, 'Supported syncs: %s' % syncs[:-2])
257 # Max horizontal/vertical image size
258 if self.cache[offset+1] != 0 and self.cache[offset+2] != 0:
259 # Projectors have this set to 0
260 sizestr = '%dx%dcm' % (self.cache[offset+1], self.cache[offset+2])
261 self.ann_field(offset+1, offset+2, 'Physical size: ' + sizestr)
262 # Display transfer characteristic (gamma)
263 if self.cache[offset+3] != 0xff:
264 gamma = (self.cache[offset+3] + 100) / 100
265 self.ann_field(offset+3, offset+3, 'Gamma: %1.2f' % gamma)
267 fs = self.cache[offset+4]
274 dpms += 'active off, '
276 self.ann_field(offset+4, offset+4, 'DPMS support: %s' % dpms[:-2])
277 dt = (fs & 0x18) >> 3
284 dtstr = 'non-RGB multicolor'
286 self.ann_field(offset+4, offset+4, 'Display type: %s' % dtstr)
288 self.ann_field(offset+4, offset+4, 'Color space: standard sRGB')
289 # Save this for when we decode the first detailed timing descriptor
290 self.have_preferred_timing = (fs & 0x02) == 0x02
295 self.ann_field(offset+4, offset+4,
296 'Generalized timing formula: %ssupported' % gft)
298 def convert_color(self, value):
299 # Convert from 10-bit packet format to float
303 outval += 2 ** -(10-i)
307 def decode_chromaticity(self, offset):
308 redx = (self.cache[offset+2] << 2) + ((self.cache[offset] & 0xc0) >> 6)
309 redy = (self.cache[offset+3] << 2) + ((self.cache[offset] & 0x30) >> 4)
310 self.ann_field(offset, offset+9, 'Chromacity red: X %1.3f, Y %1.3f' % (
311 self.convert_color(redx), self.convert_color(redy)))
313 greenx = (self.cache[offset+4] << 2) + ((self.cache[offset] & 0x0c) >> 6)
314 greeny = (self.cache[offset+5] << 2) + ((self.cache[offset] & 0x03) >> 4)
315 self.ann_field(offset, offset+9, 'Chromacity green: X %1.3f, Y %1.3f' % (
316 self.convert_color(greenx), self.convert_color(greeny)))
318 bluex = (self.cache[offset+6] << 2) + ((self.cache[offset+1] & 0xc0) >> 6)
319 bluey = (self.cache[offset+7] << 2) + ((self.cache[offset+1] & 0x30) >> 4)
320 self.ann_field(offset, offset+9, 'Chromacity blue: X %1.3f, Y %1.3f' % (
321 self.convert_color(bluex), self.convert_color(bluey)))
323 whitex = (self.cache[offset+8] << 2) + ((self.cache[offset+1] & 0x0c) >> 6)
324 whitey = (self.cache[offset+9] << 2) + ((self.cache[offset+1] & 0x03) >> 4)
325 self.ann_field(offset, offset+9, 'Chromacity white: X %1.3f, Y %1.3f' % (
326 self.convert_color(whitex), self.convert_color(whitey)))
328 def decode_est_timing(self, offset):
330 bitmap = (self.cache[offset] << 9) \
331 + (self.cache[offset+1] << 1) \
332 + ((self.cache[offset+2] & 0x80) >> 7)
335 if bitmap & (1 << (16-i)):
336 modestr += est_modes[i] + ', '
338 self.ann_field(offset, offset+2,
339 'Supported established modes: %s' % modestr[:-2])
341 def decode_std_timing(self, offset):
343 for i in range(0, 16, 2):
344 if self.cache[offset+i] == 0x01 and self.cache[offset+i+1] == 0x01:
347 x = (self.cache[offset+i] + 31) * 8
348 ratio = (self.cache[offset+i+1] & 0xc0) >> 6
349 ratio_x, ratio_y = xy_ratio[ratio]
350 y = x / ratio_x * ratio_y
351 refresh = (self.cache[offset+i+1] & 0x3f) + 60
352 modestr += '%dx%d@%dHz, ' % (x, y, refresh)
354 self.ann_field(offset, offset + 15,
355 'Supported standard modes: %s' % modestr[:-2])
357 def decode_detailed_timing(self, offset):
358 if offset == -72 and self.have_preferred_timing:
359 # Only on first detailed timing descriptor
360 section = 'Preferred'
363 section += ' timing descriptor'
364 self.put(self.sn[offset][0], self.sn[offset+17][1],
365 self.out_ann, [ANN_SECTIONS, [section]])
367 pixclock = float((self.cache[offset+1] << 8) + self.cache[offset]) / 100
368 self.ann_field(offset, offset+1, 'Pixel clock: %.2f MHz' % pixclock)
370 horiz_active = ((self.cache[offset+4] & 0xf0) << 4) + self.cache[offset+2]
371 self.ann_field(offset+2, offset+4, 'Horizontal active: %d' % horiz_active)
373 horiz_blank = ((self.cache[offset+4] & 0x0f) << 8) + self.cache[offset+3]
374 self.ann_field(offset+2, offset+4, 'Horizontal blanking: %d' % horiz_blank)
376 vert_active = ((self.cache[offset+7] & 0xf0) << 4) + self.cache[offset+5]
377 self.ann_field(offset+5, offset+7, 'Vertical active: %d' % vert_active)
379 vert_blank = ((self.cache[offset+7] & 0x0f) << 8) + self.cache[offset+6]
380 self.ann_field(offset+5, offset+7, 'Vertical blanking: %d' % vert_blank)
382 horiz_sync_off = ((self.cache[offset+11] & 0xc0) << 2) + self.cache[offset+8]
383 self.ann_field(offset+8, offset+11, 'Horizontal sync offset: %d' % horiz_sync_off)
385 horiz_sync_pw = ((self.cache[offset+11] & 0x30) << 4) + self.cache[offset+9]
386 self.ann_field(offset+8, offset+11, 'Horizontal sync pulse width: %d' % horiz_sync_pw)
388 vert_sync_off = ((self.cache[offset+11] & 0x0c) << 2) \
389 + ((self.cache[offset+10] & 0xf0) >> 4)
390 self.ann_field(offset+8, offset+11, 'Vertical sync offset: %d' % vert_sync_off)
392 vert_sync_pw = ((self.cache[offset+11] & 0x03) << 4) \
393 + (self.cache[offset+10] & 0x0f)
394 self.ann_field(offset+8, offset+11, 'Vertical sync pulse width: %d' % vert_sync_pw)
396 horiz_size = ((self.cache[offset+14] & 0xf0) << 4) + self.cache[offset+12]
397 vert_size = ((self.cache[offset+14] & 0x0f) << 8) + self.cache[offset+13]
398 self.ann_field(offset+12, offset+14, 'Physical size: %dx%dmm' % (horiz_size, vert_size))
400 horiz_border = self.cache[offset+15]
401 self.ann_field(offset+15, offset+15, 'Horizontal border: %d pixels' % horiz_border)
402 vert_border = self.cache[offset+16]
403 self.ann_field(offset+16, offset+16, 'Vertical border: %d lines' % vert_border)
406 if self.cache[offset+17] & 0x80:
407 features += 'interlaced, '
408 stereo = (self.cache[offset+17] & 0x60) >> 5
410 if self.cache[offset+17] & 0x01:
411 features += '2-way interleaved stereo ('
412 features += ['right image on even lines',
413 'left image on even lines',
414 'side-by-side'][stereo-1]
417 features += 'field sequential stereo ('
418 features += ['right image on sync=1', 'left image on sync=1',
419 '4-way interleaved'][stereo-1]
421 sync = (self.cache[offset+17] & 0x18) >> 3
422 sync2 = (self.cache[offset+17] & 0x06) >> 1
423 posneg = ['negative', 'positive']
424 features += 'sync type '
426 features += 'analog composite (serrate on RGB)'
428 features += 'bipolar analog composite (serrate on RGB)'
430 features += 'digital composite (serrate on composite polarity ' \
431 + (posneg[sync2 & 0x01]) + ')'
433 features += 'digital separate ('
434 features += 'Vsync polarity ' + (posneg[(sync2 & 0x02) >> 1])
435 features += ', Hsync polarity ' + (posneg[sync2 & 0x01])
438 self.ann_field(offset+17, offset+17, features[:-2])
440 def decode_descriptor(self, offset):
441 tag = self.cache[offset+3]
443 # Monitor serial number
444 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
445 [ANN_SECTIONS, ['Serial number']])
446 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
447 self.ann_field(offset, offset+17, text.strip())
450 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
451 [ANN_SECTIONS, ['Text']])
452 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
453 self.ann_field(offset, offset+17, text.strip())
456 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
457 [ANN_SECTIONS, ['Monitor name']])
458 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
459 self.ann_field(offset, offset+17, text.strip())
461 # Monitor range limits
462 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
463 [ANN_SECTIONS, ['Monitor range limits']])
464 self.ann_field(offset+5, offset+5, 'Minimum vertical rate: %dHz' %
465 self.cache[offset+5])
466 self.ann_field(offset+6, offset+6, 'Maximum vertical rate: %dHz' %
467 self.cache[offset+6])
468 self.ann_field(offset+7, offset+7, 'Minimum horizontal rate: %dkHz' %
469 self.cache[offset+7])
470 self.ann_field(offset+8, offset+8, 'Maximum horizontal rate: %dkHz' %
471 self.cache[offset+8])
472 self.ann_field(offset+9, offset+9, 'Maximum pixel clock: %dMHz' %
473 (self.cache[offset+9] * 10))
474 if self.cache[offset+10] == 0x02:
475 # Secondary GTF curve supported
476 self.ann_field(offset+10, offset+17, 'Secondary timing formula supported')
478 # Additional color point data
479 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
480 [ANN_SECTIONS, ['Additional color point data']])
482 # Additional standard timing definitions
483 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
484 [ANN_SECTIONS, ['Additional standard timing definitions']])
486 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
487 [ANN_SECTIONS, ['Unknown descriptor']])
489 def decode_descriptors(self, offset):
490 # 4 consecutive 18-byte descriptor blocks
491 for i in range(offset, 0, 18):
492 if self.cache[i] != 0 and self.cache[i+1] != 0:
493 self.decode_detailed_timing(i)
495 if self.cache[i+2] == 0 or self.cache[i+4] == 0:
496 self.decode_descriptor(i)