GIGA R1 - analogRead(A12) returns A8 value

[megacct]

and analogRead(A13) returns A9 value. However, using Adafruit advancedAnalog library the correct values for A12 and A13 are returned

[facchinm]

Mmmmh no, I retested just to make sure and it works as intended (reads A13/DAC1 value when analogRead(A13) is called).
Are you sure you are not using digitalRead() ? Because pins from A8 to A11 are analog only and get skipped in the count when using as digital https://github.com/arduino/ArduinoCore-mbed/blob/main/variants/GIGA/pins_arduino.h#L54-L55 since they can't be used as digital pins.

[megacct]

Thanks for replying. I've made some progress narrowing this down. Board is connected via usb and no external components.

Using this code:

void setup() {
  Serial.begin(115200);
  while (!Serial) {;}
}
void loop() {
  int sensorValue8 = analogRead(A8);
  int sensorValue9 = analogRead(A9);
  int sensorValue12 = analogRead(A12);
  int sensorValue13 = analogRead(A13);

  Serial.print(" A8: ");
  Serial.print(sensorValue8);
  Serial.print(" A9: ");
  Serial.print(sensorValue9);
  Serial.print(" A12: ");
  Serial.print(sensorValue12);
  Serial.print(" A13: ");
  Serial.println(sensorValue13);
  delay(1000);  
}

With nothing connected to pins I get:
A8: 77 A9: 59 A12: 78 A13: 71
A8: 75 A9: 59 A12: 78 A13: 71
A8: 75 A9: 59 A12: 77 A13: 70
A8: 74 A9: 57 A12: 77 A13: 69
A8: 73 A9: 55 A12: 77 A13: 69
A8: 71 A9: 55 A12: 77 A13: 63
A8: 71 A9: 54 A12: 75 A13: 63
A8: 71 A9: 55 A12: 75 A13: 69
A8: 73 A9: 55 A12: 76 A13: 63
A8: 75 A9: 59 A12: 77 A13: 71

With th 3.3v pin connected to A12 or A13, no change.

With th 3.3v pin connected to A8 I get this:
A8: 1023 A9: 199 A12: 1023 A13: 238
A8: 1023 A9: 201 A12: 1023 A13: 239
A8: 1023 A9: 201 A12: 1023 A13: 239
A8: 1023 A9: 199 A12: 1023 A13: 239
A8: 1023 A9: 197 A12: 1023 A13: 237
A8: 1023 A9: 191 A12: 1023 A13: 236
A8: 1023 A9: 189 A12: 1023 A13: 234
A8: 1023 A9: 183 A12: 1023 A13: 232

With 3.3v on A9 I get this:
A8: 73 A9: 1023 A12: 191 A13: 1023
A8: 70 A9: 1023 A12: 190 A13: 1023
A8: 69 A9: 1023 A12: 190 A13: 1023
A8: 73 A9: 1023 A12: 190 A13: 1023
A8: 77 A9: 1023 A12: 191 A13: 1023
A8: 85 A9: 1023 A12: 191 A13: 1023

IF I comment out the analogRead and prints for A8 and A9:

void setup() {
  Serial.begin(115200);
  while (!Serial) {;}
}
void loop() {
//  int sensorValue8 = analogRead(A8);
//  int sensorValue9 = analogRead(A9);
  int sensorValue12 = analogRead(A12);
  int sensorValue13 = analogRead(A13);

//  Serial.print(" A8: ");
//  Serial.print(sensorValue8);
//  Serial.print(" A9: ");
//  Serial.print(sensorValue9);

  Serial.print(" A12: ");
  Serial.print(sensorValue12);
  Serial.print(" A13: ");
  Serial.println(sensorValue13);
  delay(1000);     
}

and then apply 3.3v to A12 I get this:
A12: 1023 A13: 283
A12: 1023 A13: 251
A12: 1023 A13: 217
A12: 1023 A13: 200
A12: 1023 A13: 223
A12: 1023 A13: 255

3.3v on A13 give this:
A12: 195 A13: 1023
A12: 175 A13: 1023
A12: 171 A13: 1023
A12: 190 A13: 1023
A12: 209 A13: 1023

And 3.3v on A8 or A9 has no effect.

So it only seems to be a problem when reading A8/A9.

[facchinm]

Got it, I've been able to replicate.
@Rocketct can you take a look?

[Rocketct]

sure @facchinm

[Rocketct]

Ciao @megacct this PR should fix the issue

[white-ar]

Hello, I've just come across the issue with a Giga R1. Upgrading to V 4.1.5 of the board library temporarily fixed the issue, however it has returned. Seems to only occur when compiling for the M4 co-processor core. Here is the very simple sketch:

@facchinm @Rocketct is there a way of addressing A9 using MBED calls? (as a work around). Thank you.

#include "Arduino.h"
#include "RPC.h"

#define SERVO_POT_1     A9

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

  analogReadResolution(16); //GIGA has 16 bit ADC  (0-65535)  

}

void loop() {
  // put your main code here, to run repeatedly:

int temp = analogRead(SERVO_POT_1);



}

Error message:
C:...\AppData\Local\Temp\arduino\sketches\D2129B132D44D2F5F57EC30CA80C2E2B\sketch\sketch_jul25a.ino.cpp.o: In function loop': C:\...\AppData\Local\Temp\.arduinoIDE-unsaved2024625-43476-ja9cee.pq8d\sketch_jul25a/sketch_jul25a.ino:20: undefined reference to A9'
C:...\AppData\Local\Temp.arduinoIDE-unsaved2024625-43476-ja9cee.pq8d\sketch_jul25a/sketch_jul25a.ino:20: undefined reference to `analogRead(PureAnalogPin)'
collect2.exe: error: ld returned 1 exit status

Using library RPC at version 1.0 in folder: C:...\AppData\Local\Arduino15\packages\arduino\hardware\mbed_giga\4.1.5\libraries\RPC
Using library rpclib at version 1.0.0 in folder: C:...\AppData\Local\Arduino15\packages\arduino\hardware\mbed_giga\4.1.5\libraries\rpclib
Using library openamp at version 1.0 in folder: C:...\AppData\Local\Arduino15\packages\arduino\hardware\mbed_giga\4.1.5\libraries\openamp_arduino
exit status 1

Compilation error: exit status 1

Any ideas?