examples/libs/libirq/async_isr.c

libirq usage example using asynchronous ISR handler functionality.

libirq usage example using asynchronous ISR handler functionality.

/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 */
/*
 * This example shall show how to use the libirq.
 */
 
#include <l4/irq/irq.h>
#include <l4/util/util.h>
 
#include <stdio.h>
 
enum { IRQ_NO = 17 };
 
static void isr_handler(void *data)
{
  (void)data;
  printf("Got IRQ %d\n", IRQ_NO);
}
 
int main(void)
{
  const int seconds = 5;
  l4irq_t *irqdesc;
 
  if (!(irqdesc = l4irq_request(IRQ_NO, isr_handler, 0, 0xff, 0)))
    {
      printf("Requesting IRQ %d failed\n", IRQ_NO);
      return 1;
    }
 
  printf("Attached to key IRQ %d\nPress keys now, will terminate in %d seconds\n",
         IRQ_NO, seconds);
 
  l4_sleep(seconds * 1000);
 
  if (l4irq_release(irqdesc))
    {
      printf("Failed to release IRQ\n");
      return 1;
    }
 
  printf("Bye\n");
  return 0;
}