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/*! \page License
* Copyright (C) 2009, H&D Wireless AB All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of H&D Wireless AB may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY H&D WIRELESS AB ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
* SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <rtc.h>
#include <intc.h>
#include <timer.h>
#ifdef FREERTOS_USED
#include "FreeRTOS.h"
#include "task.h"
#endif
#define TIMER_HZ 4
struct timeout_t {
U32 tick;
U32 expire_at_tick;
Bool expired;
U8 type;
void (*cb)(void* ctx);
void* ctx;
};
struct timer_t {
volatile U32 tick;
struct timeout_t timeout[10];
void (*tick_isr) (void* ctx);
const U32 MS_PER_TICK;
void *ctx;
};
#define ARRAY_SIZE(a) sizeof(a) / sizeof(a[0])
static struct timer_t TIMER = {
.tick = 0,
#ifdef FREERTOS_USED
.MS_PER_TICK = 1 / portTICK_RATE_MS,
#else
.MS_PER_TICK = TIMER_HZ,
#endif
.timeout = { { 0 } },
};
#ifdef FREERTOS_USED /* Use TICK-hook */
void vApplicationTickHook( void ) {
struct timer_t* priv = &TIMER;
priv->tick++;
if(priv->tick_isr) {
priv->tick_isr(priv->ctx);
}
}
#else /* Use interrupt directly */
static __attribute__((__interrupt__)) void irq_handler(void)
{
volatile avr32_rtc_t *rtc = &AVR32_RTC;
struct timer_t* priv = &TIMER;
priv->tick++;
if(priv->tick_isr)
priv->tick_isr(priv->ctx);
rtc->icr = AVR32_RTC_ICR_TOPI_MASK;
rtc->isr;
}
#endif
void timer_init(void (*tick_isr) (void* ctx), void* ctx)
{
struct timer_t* priv = &TIMER;
uint8_t id;
#ifndef FREERTOS_USED
INTC_register_interrupt(&irq_handler, AVR32_RTC_IRQ, AVR32_INTC_INT0);
if (!rtc_init(&AVR32_RTC, RTC_OSC_RC, 0))
Assert(0);
rtc_set_top_value(&AVR32_RTC, 115 * priv->MS_PER_TICK / 2);
rtc_enable_interrupt(&AVR32_RTC);
rtc_enable(&AVR32_RTC);
#else
/* With FreeRTOS we use the OS tick instead */
#endif
priv->tick_isr = tick_isr;
priv->ctx = ctx;
for (id = 0; id < ARRAY_SIZE(priv->timeout); id++)
priv->timeout[id].expired = TRUE;
}
U32 timer_get_ms(void)
{
struct timer_t* priv = &TIMER;
return priv->tick * priv->MS_PER_TICK;
}
void timer_delay(U32 ms)
{
struct timer_t* priv = &TIMER;
U32 expire_at_tick = priv->tick + ms / priv->MS_PER_TICK;
while (priv->tick < expire_at_tick);
}
/**
* Called from application main loop to invoke any scheduled timeout cbs.
* This function might be called as often as possible rather than at each tick
* to support the timeout value '0', e.g a timeout within less than one tick.
*
*/
void timer_poll(void)
{
struct timer_t* priv = &TIMER;
U8 i;
for (i = 0; i < ARRAY_SIZE(priv->timeout); i++) {
struct timeout_t* tmo = &priv->timeout[i];
if (tmo->expired)
continue;
if (tmo->expire_at_tick > priv->tick)
continue;
if (tmo->cb)
tmo->cb(tmo->ctx);
if (tmo->type == TIMEOUT_PERIODIC)
tmo->expire_at_tick = priv->tick + tmo->tick;
else
tmo->expired = TRUE;
}
}
static U32 timer_sched_timeout(U32 ms, U8 type)
{
struct timer_t* priv = &TIMER;
struct timeout_t* tmo;
U8 id;
Assert(type == TIMEOUT_ONESHOT || type == TIMEOUT_PERIODIC);
for (id = 0; id < ARRAY_SIZE(priv->timeout); id++) {
tmo = &priv->timeout[id];
if (tmo->expired)
break;
}
Assert(id != ARRAY_SIZE(priv->timeout));
tmo->tick = ms / priv->MS_PER_TICK;
tmo->expire_at_tick = priv->tick + tmo->tick;
tmo->type = type;
tmo->expired = FALSE;
return id;
}
U32 timer_sched_timeout_cb(U32 ms, U8 type, void (*cb)(void *ctx), void* ctx)
{
struct timer_t* priv = &TIMER;
struct timeout_t* tmo;
U8 id;
Assert(cb);
id = timer_sched_timeout(ms, type);
tmo = &priv->timeout[id];
tmo->cb = cb;
tmo->ctx = ctx;
return id;
}
U32 timer_mod(U32 id, U32 ms, U8 type, void (*cb)(void *ctx), void* ctx)
{
struct timer_t* priv = &TIMER;
if (id != INVALID_TIMER_ID && !priv->timeout[id].expired)
timer_cancel_timeout(id);
return timer_sched_timeout_cb(ms, type, cb, ctx);
}
void timer_cancel_timeout(U32 id)
{
struct timer_t* priv = &TIMER;
struct timeout_t* tmo;
tmo = &priv->timeout[id];
tmo->expired = TRUE;
}
int timer_interval_passed(U32 old, U32 new, U32 diff) {
/* New did not wrap */
if (new > old && new - old > diff) {
return 1;
}
/* New did wrap */
else if (new < old && ( ( (U32)(-1) - old ) + new ) > diff ) {
return 1;
}
return 0;
}
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