Objective:

In this tutorial we will discuss how to configure and use the LPC1768 external interrupts(EINT0-EINT3).
At the end of tutorial we will see how to use the exploreembedded external interrupt library.


EINTx Pins

LPC1768 has four external interrupts EINT0-EINT3.
As LPC1768 pins are multi functional, these four interrupts are available on multiple pins.
Below table shows mapping of EINTx pins.

Port Pin PINSEL_FUNC_0 PINSEL_FUNC_1 PINSEL_FUNC_2 PINSEL_FUNC_3
P2.10 GPIO EINT0 NMI
P2.11 GPIO EINT1 I2STX_CLK
P2_12 GPIO EINT2 I2STX_WS
P2.13 GPIO EINT3 I2STX_SDA