wdt/UserApplication.c File Reference

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Detailed Description

This is the demo application for the watchdog timer (WDT) test.

The self-diagnostic routine for the WDT is executed before the main function is called. If the WDT is not working properly, the device will hang.

This demo application sets up an interrupt for SW0, switches an LED on and then stays in a loop as long as the system is on a working state. In this loop the WDT is reset according to its open and closed period settings. If the error flag should be set, the main program would exit the loop and switch off the LED.

The following procedure can be followed in order to test that the correct behavior of the WDT. When button SW0 is pressed, the WDT is reset too early and it will issue a system reset. When button SW1 is pressed, the WDT is reset too late and a system reset will be issued as well. This "unexpected" resets should be caught by the self-diagnostic routine, which in this demo is configured to set the error flag, setup the WDT and continue to the main application. Therefore, after pressing any of the buttons the system is set on a safe state.

Application note:

AVR1610: Guide to IEC60730 Class B compliance with XMEGA

Documentation

For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author:

Atmel Corporation: http://www.atmel.com
Support email: avr@a.nosp@m.tmel.nosp@m..com

Copyright (C) 2012 Atmel Corporation. All rights reserved.

Definition in file wdt/UserApplication.c.

#include "avr_compiler.h"
#include "util/delay.h"

Include dependency graph for wdt/UserApplication.c:

Go to the source code of this file.

Functions
void	setup_led_switches ()
	Hardware setup function for button- and LED functionality.
void	correct_timing ()
	This delay is longer than the closed window setting, but shorter than the total period.
void	fast_timing ()
	This delay is shorter than the closed window setting.
void	slow_timing ()
	This delay is longer than the total period.
	ISR (SWITCH0_INT0_vect)
	Button SW0 interrupt function. The WDT will be updated too early.
	ISR (SWITCH1_INT0_vect)
	Button SW1 interrupt function. The WDT will be updated too late.

Variables
NO_INIT volatile uint8_t	classb_error
	Global error flag.
void(*	our_delay )(void) = &correct_timing
	This is a function pointer, initialized to the correct delay.