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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; version 2 of the License.
*
* 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_button.h>
#include <ao_exti.h>
#if AO_EVENT
#include <ao_event.h>
#define ao_button_queue(b,v) ao_event_put_isr(AO_EVENT_BUTTON, b, v)
#else
#define ao_button_queue(b,v)
#endif
static uint8_t ao_button[AO_BUTTON_COUNT];
static AO_TICK_TYPE ao_button_time[AO_BUTTON_COUNT];
#define AO_DEBOUNCE AO_MS_TO_TICKS(20)
#define port(q) AO_BUTTON_ ## q ## _PORT
#define bit(q) AO_BUTTON_ ## q
#define pin(q) AO_BUTTON_ ## q ## _PIN
static void
ao_button_do(uint8_t b, uint8_t v)
{
/* Debounce */
if ((AO_TICK_SIGNED) (ao_tick_count - ao_button_time[b]) < AO_DEBOUNCE)
return;
/* pins are inverted */
v = !v;
if (ao_button[b] != v) {
ao_button[b] = v;
ao_button_time[b] = ao_tick_count;
ao_button_queue(b, v);
ao_wakeup(&ao_button[b]);
}
}
#define ao_button_update(b) ao_button_do(b, ao_gpio_get(port(b), bit(b), pin(b)))
static void
ao_button_isr(void)
{
#if AO_BUTTON_COUNT > 0
ao_button_update(0);
#endif
#if AO_BUTTON_COUNT > 1
ao_button_update(1);
#endif
#if AO_BUTTON_COUNT > 2
ao_button_update(2);
#endif
#if AO_BUTTON_COUNT > 3
ao_button_update(3);
#endif
#if AO_BUTTON_COUNT > 4
ao_button_update(4);
#endif
}
#define init(b) do { \
ao_enable_port(port(b)); \
\
ao_exti_setup(port(b), bit(b), \
AO_BUTTON_MODE|AO_EXTI_MODE_FALLING|AO_EXTI_MODE_RISING|AO_EXTI_PRIORITY_MED, \
ao_button_isr); \
ao_exti_enable(port(b), bit(b)); \
} while (0)
void
ao_button_init(void)
{
#if AO_BUTTON_COUNT > 0
init(0);
#endif
#if AO_BUTTON_COUNT > 1
init(1);
#endif
}
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