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displayhdmiedid
Gopinath Srinivasan
Gopinath Srinivasan

Reputation: 125

How to get HDMI Port info from EDID block?

I am trying to get the HDMI port from the EDID data. So far I have taken the EDID data by connecting to different HDMI ports (say 1,2,3,4).When I compared the data, I can find the 0xAA byte of EDID data is varying for each port with the values 0x10,0x20,0x30,0x40 respectively. When I searched for the CEA-861-E details of EDID, the address oxAA is reserved field. Below is the link for CEA-861 specification I referred. [http://electronix.ru/forum/index.php?act=Attach&type=post&id=77872][1]

So my question is, how to know the port ID for the HDMI from EDID data? Is my understanding based on my experiment correct?

Your suggestions are highly appropriated.

Cheers, Gopinath

Upvotes: 0

Views: 2140

Answers (1)

Gopinath Srinivasan
Gopinath Srinivasan

Reputation: 125

It can be found in the vendor specific data block. A "Vendor Specific Data Block" (if any) contains as its first three bytes the vendor's IEEE 24-bit registration number, LSB first. For HDMI, it is always 00-0C-03 for HDMI Licensing, LLC. It is followed by a two byte source physical address, LSB first. The source physical address provides the CEC physical address for upstream CEC devices. For more details, please refer the below post. http://www.bitsandqubits.com/2017/06/detecting-hdmi-port-id-from-edid-data.html

Upvotes: 0

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