GIGA R1 AnalogRead CAN Bus

Hardware GIGA R1
1

I realise how strange the title looks but according to the guide sheet here: https://docs.arduino.cc/tutorials/giga-r1-wifi/giga-audio/

CANRX and CANTX can be used as ADC pins - effectively taking the total to 16 (0 - 11, DAC0 and DAC1 all work fine).

I can't seem to get this to work however, as soon as I try to analogRead(CANRX) I get an error that CANRX is not a recognised pin.

Any suggestions please?

2

Hi, can you please share a code snippet, where you try to interact with the pin and which shows what libraries you are using?

3

No libraries involved.

Basic example:

void setup(){
  Serial.begin(115200);
  Serial.println("Booted");
}

void loop(){
  uint16_t thisRead;

  thisRead=analogRead(A0);
  Serial.println(thisRead);

  thisRead=analogRead(A13);
  Serial.println(thisRead);

  thisRead=analogRead(CANRX);
  Serial.println(thisRead);

  delay(1000);
}

This is just reading a couple of analog pins, but won't compile as CANRX is not recognised as a pin.

Thanks

4

Out of the blue I would try to #include CAN.h or using the functions of the Arduino_AdvancedAnalog library.

1 Like
5

Hi @scolland,

To use the pins from CAN RX and CAN TX, you can call them by "PB_5" and "PB_13" respectively.

void setup(){
  Serial.begin(115200);
  Serial.println("Booted");
}

void loop(){
  uint16_t thisRead;

  thisRead=analogRead(A0);
  Serial.println(thisRead);

  thisRead=analogRead(A13);
  Serial.println(thisRead);

  thisRead=analogRead(PB_5);
  Serial.println(thisRead);

  delay(1000);
}

giga_pins
giga_pins640×732 94.9 KB

6

Thanks for your message. That certainly allows the script to compile however the only possible readings are 0 or 65535 (I am ready 16 bit) - i.e. 0 or 1. I think the Arduino Giga documentation is wrong and these are actually digital pins only.

7

A quick look at the code confirms CAN_RX/TX are not included in the analog pin list. They may be wired for it but they're not coded for it.