2 * Copyright (c) 2011, Olivier MATZ <zer0@droids-corp.org>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the University of California, Berkeley nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <aversive/wait.h>
34 #include <scheduler.h>
40 #define BEEP_PERIOD (100000UL/SCHEDULER_UNIT)
42 static struct cirbuf beep_fifo;
43 static char beep_fifo_buf[16];
44 volatile uint8_t beep_mask = 1; /* init beep */
54 static volatile union beep_t current_beep;
56 /* called by the scheduler */
57 static void beep_cb(void *arg)
62 if (current_beep.len == 0 && current_beep.pause == 0) {
63 if (CIRBUF_GET_LEN(&beep_fifo) == 0)
65 current_beep.u08 = cirbuf_get_head(&beep_fifo);
66 cirbuf_del_head(&beep_fifo);
69 if (current_beep.len > 0) {
71 switch (current_beep.tone) {
72 case 0: beep_mask = 1; break;
73 case 1: beep_mask = 2; break;
74 case 2: beep_mask = 4; break;
75 case 3: beep_mask = 8; break;
81 if (current_beep.pause > 0) {
82 current_beep.pause --;
86 void beep(uint8_t tone, uint8_t len, uint8_t pause)
95 cirbuf_add_tail(&beep_fifo, b.u08);
101 cirbuf_init(&beep_fifo, beep_fifo_buf, 0, sizeof(beep_fifo_buf));
102 scheduler_add_periodical_event_priority(&beep_cb, NULL,
103 BEEP_PERIOD, BEEP_PRIO);