mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-17 21:09:03 +00:00
108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/**
|
|
* Copyright (c) 2014, Analog Devices, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted (subject to the limitations in the
|
|
* disclaimer below) provided that the following conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* - 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.
|
|
*
|
|
* - Neither the name of Analog Devices, Inc. nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
|
|
* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
|
|
* HOLDERS AND CONTRIBUTORS "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
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
|
|
*/
|
|
/**
|
|
* \author Jim Paris <jim.paris@rigado.com>
|
|
*/
|
|
|
|
#include <aducrf101-contiki.h>
|
|
#include <sys/clock.h>
|
|
#include <sys/etimer.h>
|
|
|
|
static volatile clock_time_t current_clock = 0;
|
|
static volatile unsigned long current_seconds = 0;
|
|
static unsigned int second_countdown = CLOCK_SECOND;
|
|
|
|
#define SAMPLE_STACK_POINTER
|
|
#ifdef SAMPLE_STACK_POINTER
|
|
volatile uint32_t *__min_sampled_sp = (uint32_t *)0xFFFFFFFF;
|
|
#endif
|
|
|
|
void
|
|
SysTick_Handler(void)
|
|
{
|
|
#ifdef SAMPLE_STACK_POINTER
|
|
/* Take note of the lowest stack pointer we ever saw.
|
|
When compiling against newlib, the total free bytes of
|
|
RAM not ever used by heap or stack can be found via GDB:
|
|
(gdb) p (char *)__min_sampled_sp - (char *)_sbrk(0)
|
|
*/
|
|
uint32_t *sp = (uint32_t *)&sp;
|
|
if (sp < __min_sampled_sp)
|
|
__min_sampled_sp = sp;
|
|
#endif
|
|
|
|
current_clock++;
|
|
if(etimer_pending()) {
|
|
etimer_request_poll();
|
|
}
|
|
if(--second_countdown == 0) {
|
|
current_seconds++;
|
|
second_countdown = CLOCK_SECOND;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
clock_init()
|
|
{
|
|
SysTick_Config(F_CPU / CLOCK_SECOND);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
clock_time_t
|
|
clock_time(void)
|
|
{
|
|
return current_clock;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
unsigned long
|
|
clock_seconds(void)
|
|
{
|
|
return current_seconds;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
clock_delay_usec(uint16_t usec)
|
|
{
|
|
/* Delay by watching the SysTick value change. */
|
|
int32_t remaining = (int32_t)usec * F_CPU / 1000000;
|
|
int32_t old = SysTick->VAL;
|
|
while(remaining > 0) {
|
|
int32_t new = SysTick->VAL;
|
|
if(new > old) { /* wraparound */
|
|
old += SysTick->LOAD;
|
|
}
|
|
remaining -= (old - new);
|
|
old = new;
|
|
}
|
|
}
|