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 def __init__(self, **kwargs):
91 # Received data items, used as an index into samplenum/data
93 # Start/end sample numbers per data item
99 self.out_ann = self.register(srd.OUTPUT_ANN)
101 def decode(self, ss, es, data):
104 # We only care about actual data bytes that are read (for now).
105 if cmd != 'DATA READ':
109 self.sn.append([ss, es])
110 self.cache.append(data)
113 if self.state is None:
114 # Wait for the EDID header
115 if self.cnt >= OFF_VENDOR:
116 if self.cache[-8:] == EDID_HEADER:
117 # Throw away any garbage before the header
118 self.sn = self.sn[-8:]
119 self.cache = self.cache[-8:]
122 self.put(self.sn[0][0], es, self.out_ann,
123 [ANN_SECTIONS, ['Header']])
124 self.put(self.sn[0][0], es, self.out_ann,
125 [ANN_FIELDS, ['Header pattern']])
126 elif self.state == 'edid':
127 if self.cnt == OFF_VERSION:
130 self.decode_serial(-6)
131 self.decode_mfrdate(-2)
132 self.put(self.sn[OFF_VENDOR][0], es, self.out_ann,
133 [ANN_SECTIONS, ['Vendor/product']])
134 elif self.cnt == OFF_BASIC:
135 self.put(self.sn[OFF_VERSION][0], es, self.out_ann,
136 [ANN_SECTIONS, ['EDID Version']])
137 self.put(self.sn[OFF_VERSION][0], self.sn[OFF_VERSION][1],
138 self.out_ann, [ANN_FIELDS,
139 ["Version %d" % self.cache[-2]]])
140 self.put(self.sn[OFF_VERSION+1][0], self.sn[OFF_VERSION+1][1],
141 self.out_ann, [ANN_FIELDS,
142 [ "Revision %d" % self.cache[-1]]])
143 elif self.cnt == OFF_CHROM:
144 self.put(self.sn[OFF_BASIC][0], es, self.out_ann,
145 [ANN_SECTIONS, ['Basic display']])
146 self.decode_basicdisplay(-5)
147 elif self.cnt == OFF_EST_TIMING:
148 self.put(self.sn[OFF_CHROM][0], es, self.out_ann,
149 [ANN_SECTIONS, ['Color characteristics']])
150 self.decode_chromaticity(-10)
151 elif self.cnt == OFF_STD_TIMING:
152 self.put(self.sn[OFF_EST_TIMING][0], es, self.out_ann,
153 [ANN_SECTIONS, ['Established timings']])
154 self.decode_est_timing(-3)
155 elif self.cnt == OFF_DET_TIMING:
156 self.put(self.sn[OFF_STD_TIMING][0], es, self.out_ann,
157 [ANN_SECTIONS, ['Standard timings']])
158 self.decode_std_timing(self.cnt - 16)
159 elif self.cnt == OFF_NUM_EXT:
160 self.decode_descriptors(-72)
161 elif self.cnt == OFF_CHECKSUM:
162 self.put(ss, es, self.out_ann,
163 [0, ['Extensions present: %d' % self.cache[self.cnt-1]]])
164 elif self.cnt == OFF_CHECKSUM+1:
167 checksum += self.cache[i]
168 if checksum % 256 == 0:
172 self.put(ss, es, self.out_ann, [0, ['Checksum: %d (%s)' % (
173 self.cache[self.cnt-1], csstr)]])
174 self.state = 'extensions'
175 elif self.state == 'extensions':
178 def ann_field(self, start, end, annotation):
179 self.put(self.sn[start][0], self.sn[end][1],
180 self.out_ann, [ANN_FIELDS, [annotation]])
182 def lookup_pnpid(self, pnpid):
183 pnpid_file = os.path.join(os.path.dirname(__file__), 'pnpids.txt')
184 if os.path.exists(pnpid_file):
185 for line in open(pnpid_file).readlines():
186 if line.find(pnpid + ';') == 0:
187 return line[4:].strip()
190 def decode_vid(self, offset):
191 pnpid = chr(64 + ((self.cache[offset] & 0x7c) >> 2))
192 pnpid += chr(64 + (((self.cache[offset] & 0x03) << 3)
193 | ((self.cache[offset+1] & 0xe0) >> 5)))
194 pnpid += chr(64 + (self.cache[offset+1] & 0x1f))
195 vendor = self.lookup_pnpid(pnpid)
197 pnpid += ' (%s)' % vendor
198 self.ann_field(offset, offset+1, pnpid)
200 def decode_pid(self, offset):
201 pidstr = 'Product 0x%.2x%.2x' % (self.cache[offset+1], self.cache[offset])
202 self.ann_field(offset, offset+1, pidstr)
204 def decode_serial(self, offset):
205 serialnum = (self.cache[offset+3] << 24) \
206 + (self.cache[offset+2] << 16) \
207 + (self.cache[offset+1] << 8) \
212 if not chr(self.cache[offset+3-i]).isalnum():
215 serialstr += chr(self.cache[offset+3-i])
216 serial = serialstr if is_alnum else str(serialnum)
217 self.ann_field(offset, offset+3, 'Serial ' + serial)
219 def decode_mfrdate(self, offset):
221 if self.cache[offset]:
222 datestr += 'week %d, ' % self.cache[offset]
223 datestr += str(1990 + self.cache[offset+1])
225 self.ann_field(offset, offset+1, 'Manufactured ' + datestr)
227 def decode_basicdisplay(self, offset):
228 # Video input definition
229 vid = self.cache[offset]
232 self.ann_field(offset, offset, 'Video input: VESA DFP 1.')
235 sls = (vid & 60) >> 5
236 self.ann_field(offset, offset, 'Signal level standard: %.2x' % sls)
238 self.ann_field(offset, offset, 'Blank-to-black setup expected')
241 syncs += 'separate syncs, '
243 syncs += 'composite syncs, '
245 syncs += 'sync on green, '
247 syncs += 'Vsync serration required, '
249 self.ann_field(offset, offset, 'Supported syncs: %s' % syncs[:-2])
250 # Max horizontal/vertical image size
251 if self.cache[offset+1] != 0 and self.cache[offset+2] != 0:
252 # Projectors have this set to 0
253 sizestr = '%dx%dcm' % (self.cache[offset+1], self.cache[offset+2])
254 self.ann_field(offset+1, offset+2, 'Physical size: ' + sizestr)
255 # Display transfer characteristic (gamma)
256 if self.cache[offset+3] != 0xff:
257 gamma = (self.cache[offset+3] + 100) / 100
258 self.ann_field(offset+3, offset+3, 'Gamma: %1.2f' % gamma)
260 fs = self.cache[offset+4]
267 dpms += 'active off, '
269 self.ann_field(offset+4, offset+4, 'DPMS support: %s' % dpms[:-2])
270 dt = (fs & 0x18) >> 3
277 dtstr = 'non-RGB multicolor'
279 self.ann_field(offset+4, offset+4, 'Display type: %s' % dtstr)
281 self.ann_field(offset+4, offset+4, 'Color space: standard sRGB')
282 # Save this for when we decode the first detailed timing descriptor
283 self.have_preferred_timing = (fs & 0x02) == 0x02
288 self.ann_field(offset+4, offset+4,
289 'Generalized timing formula: %ssupported' % gft)
291 def convert_color(self, value):
292 # Convert from 10-bit packet format to float
296 outval += 2 ** -(10-i)
300 def decode_chromaticity(self, offset):
301 redx = (self.cache[offset+2] << 2) + ((self.cache[offset] & 0xc0) >> 6)
302 redy = (self.cache[offset+3] << 2) + ((self.cache[offset] & 0x30) >> 4)
303 self.ann_field(offset, offset+9, 'Chromacity red: X %1.3f, Y %1.3f' % (
304 self.convert_color(redx), self.convert_color(redy)))
306 greenx = (self.cache[offset+4] << 2) + ((self.cache[offset] & 0x0c) >> 6)
307 greeny = (self.cache[offset+5] << 2) + ((self.cache[offset] & 0x03) >> 4)
308 self.ann_field(offset, offset+9, 'Chromacity green: X %1.3f, Y %1.3f' % (
309 self.convert_color(greenx), self.convert_color(greeny)))
311 bluex = (self.cache[offset+6] << 2) + ((self.cache[offset+1] & 0xc0) >> 6)
312 bluey = (self.cache[offset+7] << 2) + ((self.cache[offset+1] & 0x30) >> 4)
313 self.ann_field(offset, offset+9, 'Chromacity blue: X %1.3f, Y %1.3f' % (
314 self.convert_color(bluex), self.convert_color(bluey)))
316 whitex = (self.cache[offset+8] << 2) + ((self.cache[offset+1] & 0x0c) >> 6)
317 whitey = (self.cache[offset+9] << 2) + ((self.cache[offset+1] & 0x03) >> 4)
318 self.ann_field(offset, offset+9, 'Chromacity white: X %1.3f, Y %1.3f' % (
319 self.convert_color(whitex), self.convert_color(whitey)))
321 def decode_est_timing(self, offset):
323 bitmap = (self.cache[offset] << 9) \
324 + (self.cache[offset+1] << 1) \
325 + ((self.cache[offset+2] & 0x80) >> 7)
328 if bitmap & (1 << (16-i)):
329 modestr += est_modes[i] + ', '
331 self.ann_field(offset, offset+2,
332 'Supported establised modes: %s' % modestr[:-2])
334 def decode_std_timing(self, offset):
336 for i in range(0, 16, 2):
337 if self.cache[offset+i] == 0x01 and self.cache[offset+i+1] == 0x01:
340 x = (self.cache[offset+i] + 31) * 8
341 ratio = (self.cache[offset+i+1] & 0xc0) >> 6
342 ratio_x, ratio_y = xy_ratio[ratio]
343 y = x / ratio_x * ratio_y
344 refresh = (self.cache[offset+i+1] & 0x3f) + 60
345 modestr += '%dx%d@%dHz, ' % (x, y, refresh)
347 self.ann_field(offset, offset + 15,
348 'Supported standard modes: %s' % modestr[:-2])
350 def decode_detailed_timing(self, offset):
351 if offset == -72 and self.have_preferred_timing:
352 # Only on first detailed timing descriptor
353 section = 'Preferred'
356 section += ' timing descriptor'
357 self.put(self.sn[offset][0], self.sn[offset+17][1],
358 self.out_ann, [ANN_SECTIONS, [section]])
360 pixclock = float((self.cache[offset+1] << 8) + self.cache[offset]) / 100
361 self.ann_field(offset, offset+1, 'Pixel clock: %.2f MHz' % pixclock)
363 horiz_active = ((self.cache[offset+4] & 0xf0) << 4) + self.cache[offset+2]
364 self.ann_field(offset+2, offset+4, 'Horizontal active: %d' % horiz_active)
366 horiz_blank = ((self.cache[offset+4] & 0x0f) << 8) + self.cache[offset+3]
367 self.ann_field(offset+2, offset+4, 'Horizontal blanking: %d' % horiz_blank)
369 vert_active = ((self.cache[offset+7] & 0xf0) << 4) + self.cache[offset+5]
370 self.ann_field(offset+5, offset+7, 'Vertical active: %d' % vert_active)
372 vert_blank = ((self.cache[offset+7] & 0x0f) << 8) + self.cache[offset+6]
373 self.ann_field(offset+5, offset+7, 'Vertical blanking: %d' % vert_blank)
375 horiz_sync_off = ((self.cache[offset+11] & 0xc0) << 2) + self.cache[offset+8]
376 self.ann_field(offset+8, offset+11, 'Horizontal sync offset: %d' % horiz_sync_off)
378 horiz_sync_pw = ((self.cache[offset+11] & 0x30) << 4) + self.cache[offset+9]
379 self.ann_field(offset+8, offset+11, 'Horizontal sync pulse width: %d' % horiz_sync_pw)
381 vert_sync_off = ((self.cache[offset+11] & 0x0c) << 2) \
382 + ((self.cache[offset+10] & 0xf0) >> 4)
383 self.ann_field(offset+8, offset+11, 'Vertical sync offset: %d' % vert_sync_off)
385 vert_sync_pw = ((self.cache[offset+11] & 0x03) << 4) \
386 + (self.cache[offset+10] & 0x0f)
387 self.ann_field(offset+8, offset+11, 'Vertical sync pulse width: %d' % vert_sync_pw)
389 horiz_size = ((self.cache[offset+14] & 0xf0) << 4) + self.cache[offset+12]
390 vert_size = ((self.cache[offset+14] & 0x0f) << 8) + self.cache[offset+13]
391 self.ann_field(offset+12, offset+14, 'Physical size: %dx%dmm' % (horiz_size, vert_size))
393 horiz_border = self.cache[offset+15]
394 self.ann_field(offset+15, offset+15, 'Horizontal border: %d pixels' % horiz_border)
395 vert_border = self.cache[offset+16]
396 self.ann_field(offset+16, offset+16, 'Vertical border: %d lines' % vert_border)
399 if self.cache[offset+17] & 0x80:
400 features += 'interlaced, '
401 stereo = (self.cache[offset+17] & 0x60) >> 5
403 if self.cache[offset+17] & 0x01:
404 features += '2-way interleaved stereo ('
405 features += ['right image on even lines',
406 'left image on even lines',
407 'side-by-side'][stereo-1]
410 features += 'field sequential stereo ('
411 features += ['right image on sync=1', 'left image on sync=1',
412 '4-way interleaved'][stereo-1]
414 sync = (self.cache[offset+17] & 0x18) >> 3
415 sync2 = (self.cache[offset+17] & 0x06) >> 1
416 posneg = ['negative', 'positive']
417 features += 'sync type '
419 features += 'analog composite (serrate on RGB)'
421 features += 'bipolar analog composite (serrate on RGB)'
423 features += 'digital composite (serrate on composite polarity ' \
424 + (posneg[sync2 & 0x01]) + ')'
426 features += 'digital separate ('
427 features += 'Vsync polarity ' + (posneg[(sync2 & 0x02) >> 1])
428 features += ', Hsync polarity ' + (posneg[sync2 & 0x01])
431 self.ann_field(offset+17, offset+17, features[:-2])
433 def decode_descriptor(self, offset):
434 tag = self.cache[offset+3]
436 # Monitor serial number
437 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
438 [ANN_SECTIONS, ['Serial number']])
439 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
440 self.ann_field(offset, offset+17, text.strip())
443 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
444 [ANN_SECTIONS, ['Text']])
445 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
446 self.ann_field(offset, offset+17, text.strip())
449 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
450 [ANN_SECTIONS, ['Monitor name']])
451 text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
452 self.ann_field(offset, offset+17, text.strip())
454 # Monitor range limits
455 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
456 [ANN_SECTIONS, ['Monitor range limits']])
457 self.ann_field(offset+5, offset+5, 'Minimum vertical rate: %dHz' %
458 self.cache[offset+5])
459 self.ann_field(offset+6, offset+6, 'Maximum vertical rate: %dHz' %
460 self.cache[offset+6])
461 self.ann_field(offset+7, offset+7, 'Minimum horizontal rate: %dkHz' %
462 self.cache[offset+7])
463 self.ann_field(offset+8, offset+8, 'Maximum horizontal rate: %dkHz' %
464 self.cache[offset+8])
465 self.ann_field(offset+9, offset+9, 'Maximum pixel clock: %dMHz' %
466 (self.cache[offset+9] * 10))
467 if self.cache[offset+10] == 0x02:
468 # Secondary GTF curve supported
469 self.ann_field(offset+10, offset+17, 'Secondary timing formula supported')
471 # Additional color point data
472 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
473 [ANN_SECTIONS, ['Additional color point data']])
475 # Additional standard timing definitions
476 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
477 [ANN_SECTIONS, ['Additional standard timing definitions']])
479 self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
480 [ANN_SECTIONS, ['Unknown descriptor']])
482 def decode_descriptors(self, offset):
483 # 4 consecutive 18-byte descriptor blocks
484 for i in range(offset, 0, 18):
485 if self.cache[i] != 0 and self.cache[i+1] != 0:
486 self.decode_detailed_timing(i)
488 if self.cache[i+2] == 0 or self.cache[i+4] == 0:
489 self.decode_descriptor(i)