Hello !
I am in the proccess of making a project using hardware we designed ourselves.
Primarily we use the standard avr libraries and a couple of header files we made ourselves.
The car should be able to switch from the automatic driving code driveControl(); and an wireless controllable solution.
The problem is the moment we want to utilize the RH_ASK.h library to make the car controllable wirelessly. I get this error statement
WInterrupts.c.o (symbol from plugin)*: In function attachInterrupt
Error linking for board ATmega2560 (Mega 2560) (Arduino Mega)
(.text+0x0)*: multiple definition of __vector_2
Projekt_endelig.cpp.o (symbol from plugin)*: (.text+0x0): first defined here
WInterrupts.c.o (symbol from plugin)*: In function attachInterrupt
(.text+0x0)*: multiple definition of __vector_4
Projekt_endelig.cpp.o (symbol from plugin)*: (.text+0x0): first defined here
collect2.exe*: error: ld returned 1 exit status
The odd thing is that the RH_ASK driver utilizes the TIMER1_COMPA interrupt, but this infers that it is my external interrupts INT1_vect and INT3_vect that has multiple definitions. Sure enough if I comment out the two external interrupts, the program will compile.
Below is the main program.
I hope anyone has any insight in this problem! 
Main file:
#define F_CPU 16000000
#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/delay.h>
#include <RH_ASK.h>
#include <SPI.h>
#include "Timer3_driver.h"
#include "driveControl.h"
#include "motor.h"
#include "led.h"
#define ROCKET_SWITCH 22 //Rocket switch PIN
#define TIMER_N 53036 //Timer trappe værdi.
//*******************************************************************************//
/****************************************************************/
RH_ASK rfDriver; //Reciever driver objekt
volatile unsigned char reflexCounter = 0; //Global variable for placement of car
volatile bool state = true; //Bool state used to control the variable in interrupt routines
/****************************************************************/
void initPortForInt();
/****************************************************************/
//interrupt rutine for the first reflex
//The routine starts the timer and adds 1 to reflexCounter
ISR(INT1_vect)
{
if (state)
{
state = false;
startTimerInt(TIMER_N);
reflexCounter++;
}
}
//interrupt rutine for the second reflex
//The routine starts the timer and adds 1 to reflexCounter
ISR(INT3_vect)
{
if (state)
{
state = false;
startTimerInt(TIMER_N);
reflexCounter++;
}
}
//Timer overflow routine, to ensure two inputs can't enter at the same time
//Stops timer at sets state to true
ISR(TIMER3_OVF_vect)
{
stopTimerInt();
state = true;
}
//Setup of all ports and drivers
void setup()
{
//init reciever
rfDriver.init();
//Init portB for leds on shield
initLEDport();
//init ports for interrupts
initPortForInt();
//init timer for reflex
initTimer();
//Init motor control
initMotorPWMandToggle();
//Init light control
//Init sound control
//Init global interrupt
sei();
Serial.begin(9600);
//Led sequence that assures car is ready to go
initOkay();
//make sure it starts at 0
reflexCounter = 0;
}
void loop()
{
while (digitalRead(ROCKET_SWITCH))
{
driveControl(reflexCounter);
}
while (!digitalRead(ROCKET_SWITCH))
{
uint8_t buf[7];
uint8_t buflen = sizeof(buf);
// Check if received packet is correct size
if (rfDriver.recv(buf, &buflen))
{
unsigned char speed[3] = { buf[0],buf[1],buf[2] };
unsigned char buttonPressed[3] = { (buf[3] - '0'),(buf[4] - '0'), (buf[5] - '0') };
int sumOfSpeed = atoi(speed);
if (sumOfSpeed > 200)
{
//forward(sumOfSpeed, 0, 0);
Serial.print("forward: ");
Serial.print(sumOfSpeed);
Serial.print("\n");
}
if (sumOfSpeed < 200)
{
//backward(sumOfSpeed, 0, 0);
Serial.print("backward: ");
Serial.print(sumOfSpeed);
Serial.print("\n");
}
for (int i = 0; i <= 2; i++)
{
Serial.print("Button nr. ");
Serial.print(i);
Serial.print("\n");
Serial.print(buttonPressed[i]);
Serial.print("\n");
}
// Message received with valid checksum
Serial.print("Message Received: ");
for (int i = 0; i <= 7; i++)
{
Serial.print(buf[i] - '0');
Serial.print(" ");
}
}
}
}
void initPortForInt()
{
//init PORT D pin til input
DDRD = 0;
//Pin 46 (PD3) benyttes til INT 3
//Pin 45 (PD2) benyttes til INT 2
DDRE = 0;
//init PORT A pins til input
DDRA = 0;
//Pin 22 (PA0) benyttes til Rocket_switch. Bestemmelse af driveControl eller remoteControl
//initialise interrupt
//Enable INT2, INT3 interrupt
EIMSK |= 0b00001100;
//Enable rising edge interrupt request for INT 2 and INT 3
EICRA |= 0b11110000;
//Init Timer interrupts og prescaler
}
