Custom ATMega 2560 board won't execute Arduino code

Question

I have a custom PCB with an ATMega 2560 microcontroller on it. To test if the ATMega was working properly, I uploaded the following code:

void setup() {
  Serial.begin(9600);
  Serial.println("Test setup");
  pinMode(6, OUTPUT);
  pinMode(30, OUTPUT);
  pinMode(31, OUTPUT);
  pinMode(32, OUTPUT);
}

void loop() {
  digitalWrite(6, HIGH);
  digitalWrite(30, HIGH);
  digitalWrite(31, LOW);
  digitalWrite(32, HIGH);
}

The mentioned ports are connected to LEDs, 6 to an external LED and 30, 31 and 32 to LEDs on the PCB. Each connected in series with a 220 Ohm resistor.

The board is setup like this:

When uploading I am using a Arduino UNO as ISP and after uploading the Arduino IDE says 'Done uploading' without any errors, but the board is not showing any sign of executing the code. I have checked that VCC is 5V and RESET is HIGH after uploading. The text "Test setup" is also not shown on the serial monitor.

Does anybody have a clue why the board is not working?

Thanks on forehand.

Answer 1

When using an empty ATMega2560 you need to change the fuse settings, otherwise it will just upload your code but it won't execute. This tutorial explains it very clearly: Programming ATMega 2560 with Arduino UNO