XIAO BLE Sense battery level and charging status

Excellent Forum Solutions XIAO
11

I tried the code below :

#include <Arduino.h>

uint8_t ADresolution = 1;

void setup()
{
  Serial.begin(9600);
  pinMode(P0_14, OUTPUT);
  digitalWrite(P0_14, LOW);
  // pinMode(P0_31, INPUT);

}

void loop()
{
  unsigned int TempV = analogRead(P0_31);         // Read AD to unsigned integer
  float BatV = TempV * 510 / 1510 * ADresolution; // “Adresolution” must be define
  Serial.print(TempV);
  Serial.print(" ");
  Serial.println(BatV);
  delay(200);
}

It gives me :
4294967295 for TempV
2844348.00 dor BatV

I have no changes in the value even if i unplugged the li-po.
Maybe we need to activate something for the ADC ?