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/*
* Copyright © 2013 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_debounce.h>
#include <ao_fast_timer.h>
static uint8_t ao_debounce_initialized;
static uint8_t ao_debounce_running;
static struct ao_debounce *ao_debounce;
static uint8_t values[64];
static uint8_t n;
#define d_step(n) (((n) + 1) & 63)
static void
_ao_debounce_set(struct ao_debounce *debounce, uint8_t value)
{
if (value != debounce->value) {
values[n] = value;
n = (n + 1) & 63;
debounce->value = value;
debounce->_set(debounce, value);
}
_ao_debounce_stop(debounce);
}
void
ao_debounce_dump(void)
{
uint8_t s;
for (s = 0; s < n; s++) {
printf ("%d: %d\n",
s, values[s]);
}
n = 0;
}
/*
* Get the current value, set the result when we've
* reached the debounce count limit
*/
static void
_ao_debounce_check(struct ao_debounce *debounce)
{
uint8_t next = debounce->_get(debounce);
if (next == debounce->current) {
if (debounce->count < debounce->hold) {
if (++debounce->count == debounce->hold)
_ao_debounce_set(debounce, debounce->current);
}
} else {
debounce->count = 0;
debounce->current = next;
}
}
static void
_ao_debounce_isr(void)
{
struct ao_debounce *debounce, *next;
for (debounce = ao_debounce; debounce; debounce = next) {
next = debounce->next;
_ao_debounce_check(debounce);
}
}
static void
ao_debounce_on(void)
{
ao_fast_timer_on(_ao_debounce_isr);
}
static void
ao_debounce_off(void)
{
ao_fast_timer_off(_ao_debounce_isr);
}
/*
* Start monitoring one pin
*/
void
_ao_debounce_start(struct ao_debounce *debounce)
{
uint32_t m;
m = ao_arch_irqsave();
if (!debounce->running) {
debounce->running = 1;
/* Reset the counter */
debounce->count = 0;
/* Link into list */
debounce->next = ao_debounce;
ao_debounce = debounce;
/* Make sure the timer is running */
if (!ao_debounce_running++)
ao_debounce_on();
/* And go check the current value */
_ao_debounce_check(debounce);
}
ao_arch_irqrestore(m);
}
/*
* Stop monitoring one pin
*/
void
_ao_debounce_stop(struct ao_debounce *debounce)
{
struct ao_debounce **prev;
uint32_t m;
m = ao_arch_irqsave();
if (debounce->running) {
debounce->running = 0;
/* Unlink */
for (prev = &ao_debounce; (*prev); prev = &((*prev)->next)) {
if (*prev == debounce) {
*prev = debounce->next;
break;
}
}
debounce->next = NULL;
/* Turn off the timer if possible */
if (!--ao_debounce_running)
ao_debounce_off();
}
ao_arch_irqrestore(m);
}
void
ao_debounce_init(void)
{
if (ao_debounce_initialized)
return;
ao_debounce_initialized = 1;
ao_fast_timer_init();
}
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