Using ADC on the Seeeduino xiao

I am using a Seeeduino XIAO in a fire detection system, where I need to read a voltage related to a thermistor and therefore I am using analogRead() in the Arduino environment. I have a few questions.

  1. Are any of the pins on the XIASO available for analogReference()?
  2. Is there an internal 1.1 v. reference, and how do I specify it?
  3. Is the default reference 3.3 volts?

I find that in the Arduino IDE, the constants EXTERNAL, INTERNAL, and DEFAULT aren’t recognized. Pleas advise.

Thank you.

Hi, i have the same problem.
How can i change the internal referance and which values can be selected?
How can i set an external reference?