hwa/atmel/avr/examples/02-2-blink-watchdog-irq/main.c

Blink a LED using the watchdog IRQ

 
/*  This file is part of the HWA project.
 *  Copyright (c) 2012,2015 Christophe Duparquet.
 *  All rights reserved. Read LICENSE.TXT for details.
 */
 
#include BOARD_H
 
 
/*  Watchdog timeout
 */
#define TIMEOUT                 250ms
 
 
/*  Service watchdog IRQ
 */
HW_ISR( (watchdog0,irq) )
{
  /*  Blink the LED
   */
  hw( toggle, PIN_LED );
}
 
 
int main ( )
{
  /*  Create a HWA context preloaded with RESET values to
   *  collect the hardware configuration
   */
  hwa( begin, reset );
 
  /*  Configure the LED pin
   */
  hwa( configure, PIN_LED, mode, digital_output );
 
  /*  Configure the watchdog to trigger an IRQ every TIMEOUT
   */
  hwa( configure, watchdog0,
       timeout,   TIMEOUT,
       action,    irq );
 
  /*  Configure the core to enter idle mode when asked to sleep
   */
  hwa( configure,  core0,
       sleep,      enabled,
       sleep_mode, idle );
 
  /*  Write this configuration into the hardware
   */
  hwa( commit );
 
  /*  Enable interrupts
   */
  hw( enable, interrupts );
 
  /*  Sleep between interrupts
   */
  for(;;)
    hw( wait, irq );
    
  return 0 ;
}