1 unstable release
0.2.0 | Jan 29, 2024 |
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#1254 in Hardware support
87KB
2K
SLoC
EDID Generation Crate
This crate is aimed at providing a typesafe abstraction to generate EDIDs.
TODO
General Features
- Edid 1.0 Support
- Edid 1.1 Support
- Edid 1.2 Support
- Edid 1.3 Support
- Color Point Descriptor
- Standard Timing Descriptor
- Edid 1.4 Support
- Color Point Descriptor
- Standard Timing Descriptor
- Color Management Descriptor
- CVT 3 byte Timing Codes
Specific Features
- Extensions
- Video Timing Block Extension (VTB-EXT)
- Display Information Extension (DI-EXT)
- Localized String Extension (LS-EXT)
- Digital Packet Video Link Extension (DPVL-EXT)
- CEA-861 Series Timing Extensions
Type Safety
-
Manufacturer Name
- Mandatory
- 3 Characters
- ASCII Only
- Upper Case Only
-
Product Code
- Mandatory
- 2 bytes
-
Serial Number
- 4 bytes
-
Date
- Mandatory
- Year is higher than or equal to 1990
- EDID 1.3
- Week is between 1 and 53
- EDID 1.4
- Week is between 1 and 54
-
Basic Display Parameters and Features
- Mandatory
- Video Input Definition
- Mandatory
- Analog
- Serrations on the vsync pulse are required when composite sync or sync on green
- Analog
- Mandatory
- Display Size
- Mandatory
- 0x00, 0x00 is allowed for undefined size
- Gamma
- Mandatory
- Feature Support
- Mandatory
- Bits 3 and 4 must be consistent with bit 7 at 0x14
- SRGB
- If set, the color information in the Chromaticity Coordinates must match
- Signaled, but the Gamma isn't set to 2.2
- Not signaled, but the Chromaticities match SRGB
- EDID 1.4
- Suspend is deprecated
- Standby is deprecated
- Preferred Timing
- EDID 1.3
- Required
- EDID 1.3
-
Display XY Chromaticity Coordinates
- Mandatory
-
Established Timings
- Required if Plug & Play
- 640x480@60Hz is required if Plug & Play
-
Standard Timings
- Horizontal Addressable Pixels is between 256 and 2288, in increment of 8 pixels
- Field Refresh Rate is between 60 and 123Hz
- Unused Timings mut be set to 0x01, 0x01
-
Descriptors
- Detailed Descriptors must be first and is preferred mode
- EDID 1.3
- Display Product Name is required
- Display Range Limits is required
- EDID 1.4
- Display Range Limits is required if continuous frequency, recommended otherwise
- Display Product Name is recommended
- Detailed Timings
- Display Size is set (in the base block), but Image size isn't
- Display Size is smaller than the image size
- Image Size is set but the Display Size isn't
- Frequency is between 10 and 655,350kHz
- Horizontal Addressable, Blanking and Vertical Addressable are between 0 and 4095 pixels
- HFP and Hsync are between 0 and 1023 pixels
- VFP, Vsync are between 0 and 63 lines
- Hsync / vsync are between 0 and 4095 mm
- Right / Left and Top / Bottom Borders are between 0 and 255 pixels / lines
- Can be set to 0 if undefined
- Display Range Limits
- GTF
- Minimum Horizontal Rate is higher that Maximum Horizontal Rate
- Minimum Vertical Rate is higher than Maximum Vertical Rate
- Default GTF
- Byte 11 is set to 0x0a
- Bytes 12-17 are set to 0x20
- Secondary GTF
- Byte 11 is set to 0x00
- Start Frequency is less than the highest P/N Frequency
- EDID 1.4
- Vertical Rates between 1 and 510 Hz
- Horizontal Rates between 1 and 510kHz
- GTF is deprecated in favor of CVT
- Video Timing Support
- Descriptor required if bit 0 in 0x18 is set
- Default GTF bit can be set only if bit 0 in 0x18 is set
- Secondary GTF bit can be set only if bit 0 in 0x18 is set
- CVT Supported bit can be set only if bit 0 in 0x18 is set
- Range Limits Only can only bet set for EDID 1.4
- CVT Supported can only bet set for EDID 1.4
- GTF
- Strings
- Is not empty
- Up to 13 chars
- ASCII Only
- End with 0x0a
- Padded with 0x20
- Types
- Product Name Descriptor
- Product Serial Descriptor
- Alphanumeric Data String Descriptor
Dependencies
~3MB
~50K SLoC