--- /dev/null
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, see <http://www.gnu.org/licenses/>.
+##
+
+'''
+EDID 1.3 structure decoder.
+
+Details:
+https://en.wikipedia.org/wiki/Extended_display_identification_data
+'''
+
+# TODO:
+# - EDID < 1.3
+# - Signal level standard field in basic display parameters block
+# - Additional color point descriptors
+# - Additional standard timing descriptors
+# - Extensions
+
+import sigrokdecode as srd
+import os
+
+EDID_HEADER = [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00]
+OFF_VENDOR = 8
+OFF_VERSION = 18
+OFF_BASIC = 20
+OFF_CHROM = 25
+OFF_EST_TIMING = 35
+OFF_STD_TIMING = 38
+OFF_DET_TIMING = 54
+OFF_NUM_EXT = 126
+OFF_CHECKSUM = 127
+
+
+# Pre-EDID established timing modes
+est_modes = [
+ "720x400@70Hz",
+ "720x400@88Hz",
+ "640x480@60Hz",
+ "640x480@67Hz",
+ "640x480@72Hz",
+ "640x480@75Hz",
+ "800x600@56Hz",
+ "800x600@60Hz",
+ "800x600@72Hz",
+ "800x600@75Hz",
+ "832x624@75Hz",
+ "1024x768@87Hz(i)",
+ "1024x768@60Hz",
+ "1024x768@70Hz",
+ "1024x768@75Hz",
+ "1280x1024@75Hz",
+ "1152x870@75Hz"
+]
+
+# X:Y display aspect ratios, as used in standard timing modes
+xy_ratio = [
+ (16, 10),
+ (4, 3),
+ (5, 4),
+ (16, 9)
+]
+
+# Annotation types
+ANN_FIELDS = 0
+ANN_SECTIONS = 1
+
+class Decoder(srd.Decoder):
+ api_version = 1
+ id = 'edid'
+ name = 'EDID'
+ longname = 'Extended display identification data'
+ desc = 'A data structure describing the capabilities of a display device.'
+ license = 'gplv3+'
+ inputs = ['ddc2']
+ outputs = ['edid']
+ options = {}
+ annotations = [
+ ['EDID fields', 'EDID structure fields'],
+ ['EDID sections', 'EDID structure sections'],
+ ]
+
+ def __init__(self, **kwargs):
+ self.state = None
+ # Received data items, used as an index into samplenum/data
+ self.cnt = 0
+ # Start/end sample numbers per data item
+ self.sn = []
+ # Received data
+ self.cache = []
+
+ def start(self, metadata):
+ self.out_ann = self.add(srd.OUTPUT_ANN, 'edid')
+
+ def decode(self, ss, es, data):
+ if type(data) != int:
+ raise Exception('malformed ddc2 input: expected 1 byte')
+ self.cnt += 1
+ self.sn.append( [ss, es] )
+ self.cache.append(data)
+
+ if self.state is None:
+ # Wait for the EDID header
+ if self.cnt >= OFF_VENDOR:
+ if self.cache[-8:] == EDID_HEADER:
+ # Throw away any garbage before the header
+ self.sn = self.sn[-8:]
+ self.cache = self.cache[-8:]
+ self.state = 'edid'
+ self.put(ss, es, self.out_ann, [0, ["EDID header"]])
+ elif self.state == 'edid':
+ if self.cnt == OFF_VERSION:
+ self.decode_vid(-10)
+ self.decode_pid(-8)
+ self.decode_serial(-6)
+ self.decode_mfrdate(-2)
+ elif self.cnt == OFF_BASIC:
+ version = "EDID version: %d.%d" % (self.cache[-2], self.cache[-1])
+ self.put(ss, es, self.out_ann, [0, [version]])
+ elif self.cnt == OFF_CHROM:
+ self.decode_basicdisplay(-5)
+ elif self.cnt == OFF_EST_TIMING:
+ self.decode_chromaticity(-10)
+ elif self.cnt == OFF_STD_TIMING:
+ self.decode_est_timing(-3)
+ elif self.cnt == OFF_DET_TIMING:
+ self.decode_std_timing(-16)
+ elif self.cnt == OFF_NUM_EXT:
+ self.decode_descriptors(-72)
+ elif self.cnt == OFF_CHECKSUM:
+ self.put(ss, es, self.out_ann, [0, ["Extensions present: %d" % self.cache[self.cnt-1]]])
+ elif self.cnt == OFF_CHECKSUM+1:
+ checksum = 0
+ for i in range(128):
+ checksum += self.cache[i]
+ if checksum % 256 == 0:
+ csstr = "OK"
+ else:
+ csstr = "WRONG!"
+ self.put(ss, es, self.out_ann, [0, ["Checksum: %d (%s)" % (
+ self.cache[self.cnt-1], csstr)]])
+ self.state = 'extensions'
+ elif self.state == 'extensions':
+ pass
+
+ def ann_field(self, start, end, annotation):
+ self.put(self.sn[start][0], self.sn[end][1], self.out_ann, [ANN_FIELDS, [annotation]])
+
+ def lookup_pnpid(self, pnpid):
+ pnpid_file = os.path.dirname(__file__) + '/pnpids.txt'
+ if os.path.exists(pnpid_file):
+ for line in open(pnpid_file).readlines():
+ if line.find(pnpid + ';') == 0:
+ return line[4:].strip()
+ return ''
+
+ def decode_vid(self, offset):
+ pnpid = chr(64 + ((self.cache[offset] & 0x7c) >> 2))
+ pnpid += chr(64 + (((self.cache[offset] & 0x03) << 3)
+ | ((self.cache[offset+1] & 0xe0) >> 5)))
+ pnpid += chr(64 + (self.cache[offset+1] & 0x1f))
+ vendor = self.lookup_pnpid(pnpid)
+ if vendor:
+ pnpid += " (%s)" % vendor
+ self.ann_field(offset, offset+1, pnpid)
+
+ def decode_pid(self, offset):
+ pidstr = "Product 0x%.2x%.2x" % (self.cache[offset+1], self.cache[offset])
+ self.ann_field(offset, offset+1, pidstr)
+
+ def decode_serial(self, offset):
+ serialnum = (self.cache[offset+3] << 24) \
+ + (self.cache[offset+2] << 16) \
+ + (self.cache[offset+1] << 8) \
+ + self.cache[offset]
+ serialstr = ''
+ is_alnum = True
+ for i in range(4):
+ if not chr(self.cache[offset+3-i]).isalnum():
+ is_alnum = False
+ break
+ serialstr += chr(self.cache[offset+3-i])
+ if is_alnum:
+ serial = serialstr
+ else:
+ serial = str(serialnum)
+ self.ann_field(offset, offset+3, "Serial " + serial)
+
+ def decode_mfrdate(self, offset):
+ datestr = ''
+ if self.cache[offset]:
+ datestr += "week %d, " % self.cache[offset]
+ datestr += str(1990 + self.cache[offset+1])
+ if datestr:
+ self.ann_field(offset, offset+1, "Manufactured " + datestr)
+
+ def decode_basicdisplay(self, offset):
+ # Video input definition
+ vid = self.cache[offset]
+ if vid & 0x80:
+ # Digital
+ self.ann_field(offset, offset, "Video input: VESA DFP 1.")
+ else:
+ # Analog
+ sls = (vid & 60) >> 5
+ self.ann_field(offset, offset, "Signal level standard: %.2x" % sls)
+ if vid & 0x10:
+ self.ann_field(offset, offset, "Blank-to-black setup expected")
+ syncs = ''
+ if vid & 0x08:
+ syncs += 'separate syncs, '
+ if vid & 0x04:
+ syncs += 'composite syncs, '
+ if vid & 0x02:
+ syncs += 'sync on green, '
+ if vid & 0x01:
+ syncs += 'Vsync serration required, '
+ if syncs:
+ self.ann_field(offset, offset, "Supported syncs: %s" % syncs[:-2])
+ # Max horizontal/vertical image size
+ if self.cache[offset+1] != 0 and self.cache[offset+2] != 0:
+ # Projectors have this set to 0
+ sizestr = "%dx%dcm" % (self.cache[offset+1], self.cache[offset+2])
+ self.ann_field(offset+1, offset+2, "Physical size: " + sizestr)
+ # Display transfer characteristic (gamma)
+ if self.cache[offset+3] != 0xff:
+ gamma = (self.cache[offset+3] + 100) / 100
+ self.ann_field(offset+3, offset+3, "Gamma: %1.2f" % gamma)
+ # Feature support
+ fs = self.cache[offset+4]
+ dpms = ''
+ if fs & 0x80:
+ dpms += 'standby, '
+ if fs & 0x40:
+ dpms += 'suspend, '
+ if fs & 0x20:
+ dpms += 'active off, '
+ if dpms:
+ self.ann_field(offset+4, offset+4, "DPMS support: %s" % dpms[:-2])
+ dt = (fs & 0x18) >> 3
+ dtstr = ''
+ if dt == 0:
+ dtstr = 'Monochrome'
+ elif dt == 1:
+ dtstr = 'RGB color'
+ elif dt == 2:
+ dtstr = 'non-RGB multicolor'
+ if dtstr:
+ self.ann_field(offset+4, offset+4, "Display type: %s" % dtstr)
+ if fs & 0x04:
+ self.ann_field(offset+4, offset+4, "Color space: standard sRGB")
+ # Save this for when we decode the first detailed timing descriptor
+ self.have_preferred_timing = (fs & 0x02) == 0x02
+ if fs & 0x01:
+ gft = ''
+ else:
+ gft = 'not '
+ self.ann_field(offset+4, offset+4, "Generalized timing formula: %ssupported" % gft)
+
+ def convert_color(self, value):
+ # Convert from 10-bit packet format to float
+ outval = 0.0
+ for i in range(10):
+ if value & 0x01:
+ outval += 2 ** -(10-i)
+ value >>= 1
+ return outval
+
+ def decode_chromaticity(self, offset):
+ redx = (self.cache[offset+2] << 2) + ((self.cache[offset] & 0xc0) >> 6)
+ redy = (self.cache[offset+3] << 2) + ((self.cache[offset] & 0x30) >> 4)
+ self.ann_field(offset, offset+9, "Chromacity red: X %1.3f, Y %1.3f" % (
+ self.convert_color(redx), self.convert_color(redy)))
+
+ greenx = (self.cache[offset+4] << 2) + ((self.cache[offset] & 0x0c) >> 6)
+ greeny = (self.cache[offset+5] << 2) + ((self.cache[offset] & 0x03) >> 4)
+ self.ann_field(offset, offset+9, "Chromacity green: X %1.3f, Y %1.3f" % (
+ self.convert_color(greenx), self.convert_color(greeny)))
+
+ bluex = (self.cache[offset+6] << 2) + ((self.cache[offset+1] & 0xc0) >> 6)
+ bluey = (self.cache[offset+7] << 2) + ((self.cache[offset+1] & 0x30) >> 4)
+ self.ann_field(offset, offset+9, "Chromacity blue: X %1.3f, Y %1.3f" % (
+ self.convert_color(bluex), self.convert_color(bluey)))
+
+ whitex = (self.cache[offset+8] << 2) + ((self.cache[offset+1] & 0x0c) >> 6)
+ whitey = (self.cache[offset+9] << 2) + ((self.cache[offset+1] & 0x03) >> 4)
+ self.ann_field(offset, offset+9, "Chromacity white: X %1.3f, Y %1.3f" % (
+ self.convert_color(whitex), self.convert_color(whitey)))
+
+ def decode_est_timing(self, offset):
+ # Pre-EDID modes
+ bitmap = (self.cache[offset] << 9) \
+ + (self.cache[offset+1] << 1) \
+ + ((self.cache[offset+2] & 0x80) >> 7)
+ modestr = ''
+ for i in range(17):
+ if bitmap & (1 << (16-i)):
+ modestr += est_modes[i] + ', '
+ if modestr:
+ self.ann_field(offset, offset+2, "Supported establised modes: %s" % modestr[:-2])
+
+ def decode_std_timing(self, offset):
+ modestr = ''
+ for i in range(0, 16, 2):
+ if self.cache[offset+i] == 0x01 and self.cache[offset+i+1] == 0x01:
+ # Unused field
+ continue
+ x = (self.cache[offset+i] + 31) * 8
+ ratio = (self.cache[offset+i+1] & 0xc0) >> 6
+ ratio_x, ratio_y = xy_ratio[ratio]
+ y = x / ratio_x * ratio_y
+ refresh = (self.cache[offset+i+1] & 0x3f) + 60
+ modestr += "%dx%d@%dHz, " % (x, y, refresh)
+ if modestr:
+ self.ann_field(offset, offset+2, "Supported standard modes: %s" % modestr[:-2])
+
+ def decode_detailed_timing(self, offset):
+ if offset == -72 and self.have_preferred_timing:
+ # Only on first detailed timing descriptor
+ section = 'Preferred'
+ else:
+ section = 'Detailed'
+ section += ' timing descriptor'
+ self.put(self.sn[offset][0], self.sn[offset+18][1],
+ self.out_ann, [ANN_SECTIONS, [section]])
+
+ pixclock = float((self.cache[offset+1] << 8) + self.cache[offset]) / 100
+ self.ann_field(offset, offset+1, "Pixel clock: %.2f MHz" % pixclock)
+
+ horiz_active = ((self.cache[offset+4] & 0xf0) << 4) + self.cache[offset+2]
+ self.ann_field(offset+2, offset+4, "Horizontal active: %d" % horiz_active)
+
+ horiz_blank = ((self.cache[offset+4] & 0x0f) << 8) + self.cache[offset+3]
+ self.ann_field(offset+3, offset+4, "Horizontal blanking: %d" % horiz_blank)
+
+ vert_active = ((self.cache[offset+7] & 0xf0) << 4) + self.cache[offset+5]
+ self.ann_field(offset+5, offset+7, "Vertical active: %d" % vert_active)
+
+ vert_blank = ((self.cache[offset+7] & 0x0f) << 8) + self.cache[offset+6]
+ self.ann_field(offset+6, offset+7, "Vertical blanking: %d" % vert_blank)
+
+ horiz_sync_off = ((self.cache[offset+11] & 0xc0) << 2) + self.cache[offset+8]
+ self.ann_field(offset+8, offset+11, "Horizontal sync offset: %d" % horiz_sync_off)
+
+ horiz_sync_pw = ((self.cache[offset+11] & 0x30) << 4) + self.cache[offset+9]
+ self.ann_field(offset+9, offset+11, "Horizontal sync pulse width: %d" % horiz_sync_pw)
+
+ vert_sync_off = ((self.cache[offset+11] & 0x0c) << 2) \
+ + ((self.cache[offset+10] & 0xf0) >> 4)
+ self.ann_field(offset+10, offset+11, "Vertical sync offset: %d" % vert_sync_off)
+
+ vert_sync_pw = ((self.cache[offset+11] & 0x03) << 4) \
+ + (self.cache[offset+10] & 0x0f)
+ self.ann_field(offset+10, offset+11, "Vertical sync pulse width: %d" % vert_sync_pw)
+
+ horiz_size = ((self.cache[offset+14] & 0xf0) << 4) + self.cache[offset+12]
+ vert_size = ((self.cache[offset+14] & 0x0f) << 8) + self.cache[offset+13]
+ self.ann_field(offset+12, offset+14, "Physical size: %dx%dmm" % (horiz_size, vert_size))
+
+ horiz_border = self.cache[offset+15]
+ if horiz_border:
+ self.ann_field(offset+15, offset+15, "Horizontal border: %d pixels" % horiz_border)
+ vert_border = self.cache[offset+16]
+ if vert_border:
+ self.ann_field(offset+16, offset+16, "Vertical border: %d lines" % vert_border)
+
+ features = 'Flags: '
+ if self.cache[offset+17] & 0x80:
+ features += 'interlaced, '
+ stereo = (self.cache[offset+17] & 0x60) >> 5
+ if stereo:
+ if self.cache[offset+17] & 0x01:
+ features += '2-way interleaved stereo ('
+ features += ['right image on even lines', 'left image on even lines',
+ 'side-by-side'][stereo-1]
+ features += '), '
+ else:
+ features += 'field sequential stereo ('
+ features += ['right image on sync=1', 'left image on sync=1',
+ '4-way interleaved'][stereo-1]
+ features += '), '
+ sync = (self.cache[offset+17] & 0x18) >> 3
+ sync2 = (self.cache[offset+17] & 0x06) >> 1
+ posneg = ['negative', 'positive']
+ features += 'sync type '
+ if sync == 0x00:
+ features += 'analog composite (serrate on RGB)'
+ elif sync == 0x01:
+ features += 'bipolar analog composite (serrate on RGB)'
+ elif sync == 0x02:
+ features += 'digital composite (serrate on composite polarity ' \
+ + (posneg[sync2 & 0x01]) + ')'
+ elif sync == 0x03:
+ features += 'digital separate ('
+ features += 'Vsync polarity ' + (posneg[sync2 >> 1])
+ features += ', Hsync polarity ' + (posneg[sync2 & 0x01])
+ features += ')'
+ features += ', '
+ self.ann_field(offset+17, offset+17, features[:-2])
+
+ def decode_descriptor(self, offset):
+ tag = self.cache[offset+3]
+ if tag == 0xff:
+ # Monitor serial number
+ text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
+ self.ann_field(offset, offset+17, "Serial number: %s" % text.strip())
+ elif tag == 0xfe:
+ # Text
+ text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
+ self.ann_field(offset, offset+17, "Info: %s" % text.strip())
+ elif tag == 0xfc:
+ # Monitor name
+ text = bytes(self.cache[offset+5:][:13]).decode(encoding='cp437', errors='replace')
+ self.ann_field(offset, offset+17, "Model name: %s" % text.strip())
+ elif tag == 0xfd:
+ # Monitor range limits
+ self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
+ [ANN_SECTIONS, ["Monitor range limits"]])
+ self.ann_field(offset+5, offset+5, "Minimum vertical rate: %dHz" %
+ self.cache[offset+5])
+ self.ann_field(offset+6, offset+6, "Maximum vertical rate: %dHz" %
+ self.cache[offset+6])
+ self.ann_field(offset+7, offset+7, "Minimum horizontal rate: %dkHz" %
+ self.cache[offset+7])
+ self.ann_field(offset+8, offset+8, "Maximum horizontal rate: %dkHz" %
+ self.cache[offset+8])
+ self.ann_field(offset+9, offset+9, "Maximum pixel clock: %dMHz" %
+ (self.cache[offset+9] * 10))
+ if self.cache[offset+10] == 0x02:
+ # Secondary GTF curve supported
+ self.ann_field(offset+10, offset+17, "Secondary timing formula supported")
+ elif tag == 0xfb:
+ # Additional color point data
+ self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
+ [ANN_SECTIONS, ["Additional color point data"]])
+ elif tag == 0xfa:
+ # Additional standard timing definitions
+ self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
+ [ANN_SECTIONS, ["Additional standard timing definitions"]])
+ else:
+ self.put(self.sn[offset][0], self.sn[offset+17][1], self.out_ann,
+ [ANN_SECTIONS, ["Unknown descriptor"]])
+
+ def decode_descriptors(self, offset):
+ # 4 consecutive 18-byte descriptor blocks
+ for i in range(offset, 0, 18):
+ if self.cache[i] != 0 and self.cache[i+1] != 0:
+ self.decode_detailed_timing(i)
+ else:
+ if self.cache[i+2] == 0 or self.cache[i+4] == 0 or True:
+ self.decode_descriptor(i)
+
+
+
+
projects / libsigrokdecode.git / blobdiff