Only half of the robot turns

[Arhowk]

Originally Posted by Ether

Sounds like it might be Cheezy drive? I seem to recall seeing something about WPILib incorporating Cheezy Drive into their Arcade code. Or maybe I just imagined that...

The implementation in wpilibj does not appear to be cheezy drive..

  public void arcadeDrive(double moveValue, double rotateValue, boolean squaredInputs) {
    // local variables to hold the computed PWM values for the motors
    if (!kArcadeStandard_Reported) {
      UsageReporting.report(tResourceType.kResourceType_RobotDrive, getNumMotors(),
          tInstances.kRobotDrive_ArcadeStandard);
      kArcadeStandard_Reported = true;
    }

    double leftMotorSpeed;
    double rightMotorSpeed;

    moveValue = limit(moveValue);
    rotateValue = limit(rotateValue);

    if (squaredInputs) {
      // square the inputs (while preserving the sign) to increase fine control
      // while permitting full power
      if (moveValue >= 0.0) {
        moveValue = (moveValue * moveValue);
      } else {
        moveValue = -(moveValue * moveValue);
      }
      if (rotateValue >= 0.0) {
        rotateValue = (rotateValue * rotateValue);
      } else {
        rotateValue = -(rotateValue * rotateValue);
      }
    }

    if (moveValue > 0.0) {
      if (rotateValue > 0.0) {
        leftMotorSpeed = moveValue - rotateValue;
        rightMotorSpeed = Math.max(moveValue, rotateValue);
      } else {
        leftMotorSpeed = Math.max(moveValue, -rotateValue);
        rightMotorSpeed = moveValue + rotateValue;
      }
    } else {
      if (rotateValue > 0.0) {
        leftMotorSpeed = -Math.max(-moveValue, rotateValue);
        rightMotorSpeed = moveValue + rotateValue;
      } else {
        leftMotorSpeed = moveValue - rotateValue;
        rightMotorSpeed = -Math.max(-moveValue, -rotateValue);
      }
    }

    setLeftRightMotorOutputs(leftMotorSpeed, rightMotorSpeed);
  }

Can you try using the stick's move and rotate axes so you can print those off as you send them? (and post the output here)