Hi,
Are you using ADV7842 Evaluation platform or customized platform?
Are you able to reproduce it in Evaluation platform?
We have tried with 7842 TV application with "request active source". we are able to get the message "active source" from the source.
Have you set the registers(logical address) as above?
Have you received any message in the 7842 CEC_BUF0_RX_FRAME_DATA(0x15 to 0x25) after "request active source"? Could you send me buffer values?
For enabling all the buffers set 0x77[0] as 1 and check whether you received any message in the buffers.
Regards,
Poornima.