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...