CC3220SF: analogRead() Returns 1023

[rei-vilo]

The analogRead()on the minimalist example below always returns 1023.

Placing and removing jumper J14 OPAMP EN has no effect.

Same for using 23 instead of A0.

The exact reference of the board is CC3220SF Rev-A. Pin 23 is connected to the middle point of a 10 kΩ potentiometer, connected to +3.3V and GROUND.

Same code works fine on the CC3200 LaunchPad, with taking care not to exceed 1.7 V.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly: 
  Serial.println(analogRead(A0));
  delay(1000);
}

[rei-vilo]

[rei-vilo]

A more detailed report, with Op.Amp En shunt on.

Pin	Port	Result	Comment
23	A0	no	587..594
24	A3	yes	0..963
25	A1	yes	0..963
26	A2	yes	0..963