Arduino & Roborio cant find each other I2C Issues

[avayner]

We've done exactly that, but for some reason onRequest was not being triggered... Any ideas how to troubleshoot this?

[euhlmann]

Originally Posted by avayner

We've done exactly that, but for some reason onRequest was not being triggered... Any ideas how to troubleshoot this?

Could you post the code you're using (roborio and arduino)?

[zDrakon]

Roborio code: http://pastebin.com/TiFcYq6L

Arduino: http://pastebin.com/TDPk9W5i

Do keep in mind we did try using onREquest for arduino and set it up as a slave prior but for some reason it didnt work. My team is confused, even the mentor is having trouble explaining what's happening.

[euhlmann]

I see. Try this

roboRIO:

static I2C arduino = new I2C(Port.kOnboard, 42);

@Override
public void teleopPeriodic() {
    byte[] sendData = "sample text".getBytes();
    byte[] receiveData = new byte[sendData.length];
    boolean failed = arduino.transaction(sendData, sendData.length, receiveData, receiveData.length);
    if(!failed) {
        System.out.println("Got data: " + new String(receiveData, 0, receiveData.length);
    }
}

Arduino:

#include <Wire.h>

void setup() {
  Wire.begin(42);
  Wire.onRequest(requestEvent);
  Serial.begin(9600);
}

void loop() {
  delay(100);
}

// send back the same data as we receive
void requestEvent() {
  Serial.println("Got request:");
  while (Wire.available()) {
    char c = Wire.read();
    Serial.print(c);
    Wire.write(c);
  }
}

[Harp]

The Arduino didn't read anything from the roborio using this code. We've since switched to using a raspberry pi