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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_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
#define AO_BUTTON_DEBOUNCE_INTERVAL AO_MS_TO_TICKS(50)
struct ao_button_state {
AO_TICK_TYPE time;
uint8_t value;
};
static struct ao_button_state ao_button_state[AO_BUTTON_COUNT];
#define port(q) AO_BUTTON_ ## q ## _PORT
#define bit(q) AO_BUTTON_ ## q
#define pin(q) AO_BUTTON_ ## q ## _PIN
/* pins are inverted */
#define ao_button_value(b) !ao_gpio_get(port(b), bit(b), pin(b))
static uint8_t
_ao_button_get(uint8_t b)
{
switch (b) {
#if AO_BUTTON_COUNT > 0
case 0: return ao_button_value(0);
#endif
#if AO_BUTTON_COUNT > 1
case 1: return ao_button_value(1);
#endif
#if AO_BUTTON_COUNT > 2
case 2: return ao_button_value(2);
#endif
#if AO_BUTTON_COUNT > 3
case 3: return ao_button_value(3);
#endif
#if AO_BUTTON_COUNT > 4
case 4: return ao_button_value(4);
#endif
}
return 0;
}
static void
_ao_button_check(uint8_t b)
{
uint8_t value = _ao_button_get(b);
if (value != ao_button_state[b].value) {
AO_TICK_TYPE now = ao_time();
if ((now - ao_button_state[b].time) >= AO_BUTTON_DEBOUNCE_INTERVAL) {
ao_button_state[b].value = value;
ao_button_queue(b, value);
}
ao_button_state[b].time = now;
}
}
static void
_ao_button_init(uint8_t b)
{
uint8_t m = ao_arch_irqsave();
uint8_t value = _ao_button_get(b);
ao_button_state[b].value = value;
ao_button_state[b].time = ao_time();
ao_button_queue(b, value);
ao_arch_irqrestore(m);
}
uint8_t
ao_button_get(uint8_t b)
{
return ao_button_state[b].value;
}
static void
ao_button_isr(void)
{
uint8_t b;
for (b = 0; b < AO_BUTTON_COUNT; b++)
_ao_button_check(b);
}
#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)); \
_ao_button_init(b); \
} while (0)
void
ao_button_init(void)
{
#if AO_BUTTON_COUNT > 0
init(0);
#endif
#if AO_BUTTON_COUNT > 1
init(1);
#endif
#if AO_BUTTON_COUNT > 2
init(2);
#endif
#if AO_BUTTON_COUNT > 3
init(3);
#endif
#if AO_BUTTON_COUNT > 4
init(4);
#endif
}
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