Jump to content

Need Help With VIA VT2021 Codec


  • Please log in to reply
No replies to this topic

#1
nittin

nittin

    InsanelyMac Protégé

  • Members
  • Pip
  • 1 posts
I tried to make VIA VT2021 audio codec work with AppleHDA. So far it was a success, but not 100%. I managed to get the below ports working properly

1. Rear Green (EAPD is present) – IntSpeaker

2. Rear Blue – LineIn

3. Rear SPDIF Out

4. Front Green - Headphone


But hit a barrier with “Front & Rear Microphones” working only as “LineIn”. Yet it shows as Internal Microphone in System preferences. (only works as “internal mic”, not “ExtMic”)

After few days of investigation, I figured out the reason, why it’s only working as LineIn. By default the power ports (VREF ports) are off for both front and rear microphones. Look at the functional diagram VIA VT2021 DOCUMENTATION COPY



Pin 28 (VrefOut-B-L) & 32 (VrefOut-B-R) power the Rear Mic “21/22 Port B”.
Pin 30 (VrefOut-F) powers Front Mic “16/17 Port F”

Note – Pin 16, 17, 21, 22, 28, 30 are not Node ID’s. It’s the sequential pin numbers in circuit

You can see (highlighted in red) the VREF ports are off by default and we need to trigger these “VREF switches” in order to get front & rear Mic working as microphones

I’ve done lot of researches online, but couldn’t get any clue on “how to trigger these ports”.

Can you shed some light on how to trigger these ports? I’d really appreciate if you can help on this matter. I’ve attached all inputs for this project below

Thanks in advance

Attached Files







0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

© 2014 InsanelyMac  |   News  |   Forum  |   Downloads  |   OSx86 Wiki  |   Mac Netbook  |   PHP hosting by CatN  |   Designed by Ed Gain  |   Logo by irfan  |   Privacy Policy