PeakMeterMono Example Error Compiling on Teensy 4.0

[FillGee]

Hi,
As I am venturing into using the Teensy for audio processing, I have encountered a speedbump.

I have a 3.5mm TRRS jack wired up to pin 16 (A2) on my Teensy 4.0 following the suggested circuit on the design tool (shown below).


I wanted to test the input so I loaded up the "PeakMeterMono" sketch that is included under the audio examples, but when I try to compile and run the program completed unedited, I get an "Error compiling for board Teensy 4.0".
Full error code is here:

Arduino: 1.8.10 (Windows 10), TD: 1.48, Board: "Teensy 4.0, Serial, 600 MHz, Faster, US English"

C:\Users\---\AppData\Local\Temp\arduino_build_262521\sketch\PeakMeterMono.ino.cpp.o: In function `AudioInputAnalog::AudioInputAnalog()':

C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/input_adc.h:37: undefined reference to `AudioInputAnalog::init(unsigned char)'

C:\Users\---\AppData\Local\Temp\arduino_build_262521\sketch\PeakMeterMono.ino.cpp.o: In function `AudioStream::AudioStream(unsigned char, audio_block_struct**)':

C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy4/AudioStream.h:130: undefined reference to `vtable for AudioInputAnalog'

collect2.exe: error: ld returned 1 exit status

Multiple libraries were found for "Audio.h"
 Used: C:\Program
Multiple libraries were found for "SPI.h"
 Used: C:\Program
Multiple libraries were found for "SD.h"
 Used: C:\Users\---\Documents\Arduino\libraries\SD
 Not used: C:\Program
 Not used: C:\Program
Multiple libraries were found for "SerialFlash.h"
 Used: C:\Program
Multiple libraries were found for "Wire.h"
 Used: C:\Program
Error compiling for board Teensy 4.0.

The same error occurs anytime I try to use a sketch that contains AudioInputAnalog it seems. Is there any fix to this, or do I just need to bite the bullet and buy an audio shield to wire the 3.5mm jack to?

 

[manitou]

I don't think AudioInputAnalog is supported yet on the T4. In the interim maybe try a T3.5 or T3.6

 

[FillGee]

Dang, that's what I figured but was hoping wasn't true.

This new audio project is really going to be an addon to an existing project in which I have already mounted and soldered things in place, so I would prefer to not have to change boards to a 3.5 or 3.6 and undo it all.

Regarding my final question in the original post, if I get the audio shield for the 4.0, I can simply wire the TRRS jack into the line-in inputs without any issue correct? The library seems to have a lot of examples for getting audio out of the shield but not so much documentation for getting sound into it except for through the SD card.