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/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_event.h>
#define AO_EVENT_QUEUE 64
#define ao_event_queue_next(n) (((n) + 1) & (AO_EVENT_QUEUE - 1))
#define ao_event_queue_prev(n) (((n) - 1) & (AO_EVENT_QUEUE - 1))
#define ao_event_queue_empty() (ao_event_queue_insert == ao_event_queue_remove)
#define ao_event_queue_full() (ao_event_queue_next(ao_event_queue_insert) == ao_event_queue_remove)
struct ao_event ao_event_queue[AO_EVENT_QUEUE];
uint8_t ao_event_queue_insert;
uint8_t ao_event_queue_remove;
void
ao_event_get(struct ao_event *ev)
{
ao_arch_critical(
while (ao_event_queue_empty())
ao_sleep(&ao_event_queue);
*ev = ao_event_queue[ao_event_queue_remove];
ao_event_queue_remove = ao_event_queue_next(ao_event_queue_remove);
);
}
uint8_t
ao_event_get_for(struct ao_event *ev, uint16_t timeout)
{
uint8_t empty = 1;
ao_arch_critical(
while ((empty = ao_event_queue_empty()))
if (ao_sleep_for(&ao_event_queue, timeout))
break;
if (!empty) {
*ev = ao_event_queue[ao_event_queue_remove];
ao_event_queue_remove = ao_event_queue_next(ao_event_queue_remove);
}
);
return empty;
}
/* called with interrupts disabled */
void
ao_event_put_isr(uint8_t type, uint8_t unit, int32_t value)
{
if (!ao_event_queue_full()) {
ao_event_queue[ao_event_queue_insert] = (struct ao_event) {
.type = type,
.unit = unit,
.tick = ao_tick_count,
.value = value
};
ao_event_queue_insert = ao_event_queue_next(ao_event_queue_insert);
ao_wakeup(&ao_event_queue);
}
}
void
ao_event_put(uint8_t type, uint8_t unit, int32_t value)
{
ao_arch_critical(ao_event_put_isr(type, unit, value););
}
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