Does Jetson Nano support CEC over HDMI port? If yes, could you provide any information how to activate it on NVIDIA Ubuntu 18.04 image?
No, our SW doesn’t support CEC over HDMI.
Does the HW support CEC? From the schematic, I can see pin 13 (CEC_HDMI) of J6 is connected to somewhere, so I’m hoping CEC is supported by HW, and can work with some proper SW changes.
Thanks.
would be nice to get some more elaborated answers from the nvidia people.
The HDMI-CEC pin is connected according to Nvidia’s documentation.
I downloaded the Jetson Nano Carrier Board hardware design files (which are available from Nvidia, part # P3449-B01, document 600-13449-0000-400) and can confirm that HDMI-CEC, pin 13 on the HDMI port is connected to some IO circuitry which then connects to pin 94 on the SODIMM connector, to the Jetson Nano Module.
The datasheet of the Jetson Nano Module (which is also available from Nvidia, document DA-09366-001_v1.0) then describes pin 94 as HDMI_CEC on p94. The description of this pin is:
Consumer Electronics Control (CEC) one-wire serial
bus.
NVIDIA provides low level CEC APIs (read/write).
These are not supported in earlier Android releases.
For additional CEC support, 3rd party libraries need to
be made available.
What I don’t know, is where this “low level CEC API” is.