BRT Community
General Category => Discussion - EVE => Topic started by: Cyrilou on March 01, 2023, 03:15:42 PM
-
Hi,
I'd like to disable this output by software because screen emits 20db peak on spectrum analyser on near field with ffc20 ribbon. This is problematic for CE certification.
When I cut AUDIO_L line on FFC20 ribbon on screen side, it's ok! But I need a software solution.
What should I try?
If I disable audio engine (reg_cpureset=4), output is still active.
What in theory could OFF AUDIO_L pin, I see nothing in BT815 datasheet, there is always 30Mhz sinusoidal signal in idle (no sounds played).
Thank you.
-
Hello,
One way is to play the 'silence' sound by writing 0x00 to the REG_SOUND register.
You can find details of the audio playback registers in section 4.7 of the datasheet,
https://brtchip.com/wp-content/uploads/sites/3/2022/04/DS_BT81X-1.1.pdf
Best Regards, BRT Community
-
Hi,
This doesn't work. I tried another one.
I wrote 0x04 at hidden address 0x3020E4, this reduces signal to 140KHz and that's all.
-
Hi,
Could you advise which EVE device you have?
Best Regards, BRT Community
-
Hi it's a Matrix Orbital 43A IPS with EVE3 BT815 chip.
-
can try to play "mute" to get the AUDIO_L pin low:
write 0x60 (mute) to REG_SOUND.
It should make AUDIO_L pin low...