nes-proj/arch/cpu/cc13xx-cc26xx/dev/clock-arch.c

/*
 * Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
 * 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. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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 HOLDER 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.
 */
/*---------------------------------------------------------------------------*/
/**
 * \addtogroup cc26xx-clocks
 * @{
 *
 * \defgroup cc26xx-software-clock Software Clock
 *
 * Implementation of the clock module for the CC26xx and CC13xx.
 *
 * The software clock uses the facilities provided by the AON RTC driver
 * @{
 *
 * \file
 * Software clock implementation for the TI CC13xx/CC26xx
 */
/*---------------------------------------------------------------------------*/
#include <driverlib/aon_rtc.h>
#include <driverlib/interrupt.h>
#include <driverlib/prcm.h>
#include <driverlib/timer.h>
#include <ti/drivers/dpl/ClockP.h>
#include <ti/drivers/power/PowerCC26XX.h>
#include <unistd.h>

#include "contiki.h"

#define DPL_CLOCK_TICK_PERIOD_US ClockP_getSystemTickPeriod()
#define CLOCK_TICKS_SECOND ((uint32_t)1000000 / (CLOCK_SECOND) / (DPL_CLOCK_TICK_PERIOD_US))

/*---------------------------------------------------------------------------*/
static volatile uint64_t count;
static ClockP_Struct etimerClock;
static void clock_update(void);
/*---------------------------------------------------------------------------*/
void
clock_init(void)
{
  count = 0;
  ClockP_Params params;
  ClockP_Params_init(&params);
  params.period = CLOCK_TICKS_SECOND;
  params.startFlag = true;
  ClockP_construct(&etimerClock, (ClockP_Fxn)&clock_update, CLOCK_TICKS_SECOND, &params);
}
/*---------------------------------------------------------------------------*/
CCIF clock_time_t
clock_time(void)
{
    uintptr_t hwiState = HwiP_disable();
    clock_time_t result = count;
    HwiP_restore(hwiState);

  return (clock_time_t)(result & 0xFFFFFFFF);
}
/*---------------------------------------------------------------------------*/
static void
clock_update(void)
{
  uintptr_t hwiState = HwiP_disable();
  count++;
  HwiP_restore(hwiState);

  if(etimer_pending()) {
    etimer_request_poll();
  }
}
/*---------------------------------------------------------------------------*/
CCIF unsigned long
clock_seconds(void)
{
    uintptr_t hwiState = HwiP_disable();
    unsigned long result = count / CLOCK_SECOND;
    HwiP_restore(hwiState);

    return result;
}
/*---------------------------------------------------------------------------*/
void
clock_wait(clock_time_t i)
{
  clock_time_t start;

  start = clock_time();
  while(clock_time() - start < (clock_time_t)i);
}
/*---------------------------------------------------------------------------*/
void
clock_delay_usec(uint16_t len)
{
    usleep(len);
}
/*---------------------------------------------------------------------------*/
/**
 * \brief Obsolete delay function but we implement it here since some code
 * still uses it
 */
void
clock_delay(unsigned int i)
{
  clock_delay_usec(i);
}
/*---------------------------------------------------------------------------*/
/**
 * @}
 * @}
 */