/* Copyright (C) 2008 Emmanuel Varoquaux This file is part of XOS. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* Pour emettre un bip, on utilise conjointement le compteur 2 du 8253 PIT et * le speaker du 8255 PPI. */ #include <alarm.h> #include <alarm_struct.h> #include <asm.h> static struct alarm_struct beep_alarm; /* start_beep() emet un nouveau bip a chaque appel, meme si un bip est deja en * cours. */ static void start_beep() { int intr; disable_intr(intr); outbp(0xb6, 0x43); /* commande : ecriture de deux octets */ outbp(0x37, 0x42); /* frequence : 0x637 (750 Hz) */ outb(0x06, 0x42); outbp(inbp(0x61) | 0x3, 0x61); /* compteur 2 */ alarm_set(&beep_alarm, 125); /* duree : 1/8 seconde */ restore_intr(intr); } static void stop_beep() { outb(inbp(0x61) & 0xfc, 0x61); } void beep_init() { alarm_init(&beep_alarm, stop_beep); } void beep() { start_beep(); }