LPC18xx/43xx Watchdog timer example

Detailed Description

Example description
This example shows how to use Windowed watchdog timer to generate interrupts to manage the watchdog timer. If the watchdog timer isn't 'fed' within it's window time, it will reset the device. The LED will toggle states on each watchdog feed event. You can also use a terminal program with the UART to select the feed event. If the feed is disabled, the chip will reset.

No special setup is required for the demo. Just build and run. NGX Xplorer users (no UART) should modify the code to test the different watchdog events.

The example works in one of 4 ways. If '1' is selected, WDT is fed by the sysTick at 20Hz and should never time out (fast LED). If '2' is selcted, the WDT is fed by the watchdog window interrupt (slow LED). If '3' is selected, the watchdog times out and resets the device. If '4' is selected, the interrupt for the WDT timeout events are routed via the event router handler instead of the watchdog interrupt handler.

Special connection requirements
There are no special connection requirements for this example.

Build procedures:
LPC18xx/43xx example quickstart for Keil uVision4
LPC18xx/43xx example quickstart for IAR EWARM
LPC18xx/43xx example quickstart for Code Red Xpresso

Supported boards and board setup:
Hitex 1850 evaluation boards
Hitex 4350 evaluation boards
Keil 1857 evaluation boards
Keil 4357 evaluation boards
NGX 1830 Xplorer boards
NGX 4330 Xplorer boards

Submitting LPCOpen issues:
Community support for LPCOpen

Functions
static void	wdt_handle (void)
void	EVRT_IRQHandler (void)
	Event router Interrupt Handler.
void	WDT_IRQHandler (void)
	watchdog timer Interrupt Handler
void	SysTick_Handler (void)
	SysTick Interrupt Handler.
int	main (void)
	Main entry point.

Variables
static volatile int	wdtFeedState
static volatile bool	On = false
static volatile bool	On1 = false

Function Documentation

void EVRT_IRQHandler

(

void

)

Event router Interrupt Handler.

Returns

Nothing Handles event router events

Definition at line 127 of file watchdog.c.

int main

(

void

)

Main entry point.

Main program body.

Returns

Nothing

Definition at line 165 of file watchdog.c.

void SysTick_Handler

(

void

)

SysTick Interrupt Handler.

SysTick 1mS tick handler.

Returns

Nothing

Note

Systick interrupt handler feeds WWDT

Definition at line 153 of file watchdog.c.

static void wdt_handle ( void  )

static

Definition at line 91 of file watchdog.c.

void WDT_IRQHandler

(

void

)

watchdog timer Interrupt Handler

Returns

Nothing

Note

Handles watchdog timer warning and timeout events

Definition at line 143 of file watchdog.c.

Variable Documentation

volatile bool On = false

static

Definition at line 80 of file watchdog.c.

volatile bool On1 = false

static

Definition at line 80 of file watchdog.c.

volatile int wdtFeedState

static

Definition at line 79 of file watchdog.c.