The Adafruit LCD shield offers an LCD and access to 4 button, using only a two wire connection with the Arduino. This is achieved with the MCP23017 I2C port expander IC.
These buttons are not directly assigned to pins, since only two pins are required for the whole communication, via the I2C protocol.
Can i use a hardware interrupt with any of the 4 buttons? If not, is there any workaround to trigger an interrupt when one of these buttons is pressed?
PS: I am using Arduino Due