I am designing password based door lock system using LPC 1769. I have build up the code of changing the state but now I am stuck to use joystick pins or switch key 3 or switch key 4 pins to use as an external interrupt. This I am using to reset the system whenever i give an external interrupt. Please help me to configured any switch key to use as an external interrupt and please tell about external interrupt service handler framework in general.
Your help will be very much appreciated.