View source for Interrupts On Explore M3 ← Interrupts On Explore M3

[[Category:Explore M3 Bare Metal]]
In this tutorial we will discuss how to use the external interrupts on Explore M3.
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=Prerequisites=
Please check [[LPC1768: External Interrupts|this tutorial]] for detailed explanation on inbuilt Lpc1768 External Interrupts.<br>
If you are doing it for the first time, then check the below links to setup the project for generating the .bin file.
#[[LPC1768: Keil Project For Bin File|Keil4 Setup]] 
#[[Setting Up Keil5 For ExploreM3|Keil5 Setup]] 
#[[Setting Up ARM GCC For ExploreM3 LPC1768|ARM GCC Setup]]
#[[Setting Up ARM GCC And Eclipse For ExploreM3 LPC1768|Eclipse & ARM GCC Setup]]
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=EINTx Pins=
LPC1768 has four external interrupts EINT0-EINT3.<br>
Below table shows mapping of EINTx pins.
{| class="table table-striped table-hover table-condensed table-bordered"
|-class="info"
!Interrupt || LPC1768 Pin || Explore M3 pin ||Enum to be used
|-
|EINT0 || P2.10 || ISP || <b>EINT0</b>
|-   
|EINT1 || P2.11 || USB_BOOT || <b>EINT1</b> 
|-
|EINT2 || P2_12 || 30 || <b>EINT2</b>
|-
|EINT3 || P2.13 || 31 || <b>EINT3</b>
|}
<b>Note:</b> 
#<b>ISP</b> Pin is used for <b>ISP programming</b> and it should not be zero during RESET, else the controller will in ISP mode.
#<b>USB_BOOT</b> Switch is used for <b>Usb/Dfu</b> bootloader and it should not be zero during RESET, else the controller will in <b>USB/DFU</b> boot mode.
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[[FILE:Lpc1768_external_interrupts.png]]

=Hardware Connection=
LED is Connected to pin 13 on Explore M3 board.<br><br><br>

=Code=
Below is the sample code to blink the LED's with 1ms delay using systick timer.
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