QUAD I2S with Audio shield Rev D2 and Teensy 4.1

[fan_2021]

Hi,
I just bought Rev D2 audio shield for Teensy 4.1
Can someone point me to the instruction for modifying rev d2 for teensy 4.1 to do Quad i2s audio?
Most resources online show rev D.

Thanks!

 

[joepasquariello]

Maybe this thread will help

https://forum.pjrc.com/index.php?threads/bit-bang-multiple-i2s-inputs-simultaneously.29373/post-93521

 

[fan_2021]

@joepasquariello , Thanks for the reply.

But that thread doesn't mention anything about teensy 4.1 audio shield rev D2 mod.

 

[kd5rxt-mark]

Hi,
I just bought Rev D2 audio shield for Teensy 4.1
Can someone point me to the instruction for modifying rev d2 for teensy 4.1 to do Quad i2s audio?
Most resources online show rev D.

Thanks!

@fan_2021:

Take a look at <this> post. Note that you will need at least one original Rev D audio shield to go along with your Rev D2 in order to do quad audio.

Hope that helps . . .

Mark J Culross
KD5RXT

 

[PaulStoffregen]

You must use at least 1 rev D board (for channels 3-4). The other can be rev D or rev D2 (for channels 1-2).

Instructions for Teensy 4.0 and Teensy 4.1 are virtually identical. The rev D audio shield which becomes channels 3-4 needs to be modified and 2 wires need to be soldered from the disconnected data signals to Teensy pins 6 and 32.

The difference between Teensy 4.0 and Teensy 4.1 is the location of pin 32. On Teensy 4.0 it is accessed by a pad on the back side. On Teensy 4.1 it is a normal pin. The locations of pins are documented on the pinout reference card (you should receive a printed copy with any Teensy order).