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 |