nes-proj/drivers/cpu/nrf52832/dev/clock.c

172 lines
4.8 KiB
C

/*
* Copyright (c) 2015 Nordic Semiconductor. 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 nrf52832
* @{
*
* \addtogroup nrf52832-dev Device drivers
* @{
*
* \addtogroup nrf52832-clock Clock driver
* @{
*
* \file
* Software clock implementation for the nRF52.
* \author
* Wojciech Bober <wojciech.bober@nordicsemi.no>
*
*/
/*---------------------------------------------------------------------------*/
#include <stdint.h>
#include <stdbool.h>
#include "nrf.h"
#include "nrf_drv_config.h"
#include "nrf_drv_rtc.h"
#include "nrf_drv_clock.h"
#include "nrf_delay.h"
#include "app_error.h"
#include "contiki.h"
#include "platform-conf.h"
/*---------------------------------------------------------------------------*/
const nrf_drv_rtc_t rtc = NRF_DRV_RTC_INSTANCE(PLATFORM_RTC_INSTANCE_ID); /**< RTC instance used for platform clock */
/*---------------------------------------------------------------------------*/
static volatile uint32_t ticks;
void clock_update(void);
#define TICKS (RTC1_CONFIG_FREQUENCY/CLOCK_CONF_SECOND)
/**
* \brief Function for handling the RTC0 interrupts
* \param int_type Type of interrupt to be handled
*/
static void
rtc_handler(nrf_drv_rtc_int_type_t int_type)
{
if (int_type == NRF_DRV_RTC_INT_TICK) {
clock_update();
}
}
#ifndef SOFTDEVICE_PRESENT
/** \brief Function starting the internal LFCLK XTAL oscillator.
*/
static void
lfclk_config(void)
{
ret_code_t err_code = nrf_drv_clock_init(NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_clock_lfclk_request();
}
#endif
/**
* \brief Function initialization and configuration of RTC driver instance.
*/
static void
rtc_config(void)
{
uint32_t err_code;
//Initialize RTC instance
err_code = nrf_drv_rtc_init(&rtc, NULL, rtc_handler);
APP_ERROR_CHECK(err_code);
//Enable tick event & interrupt
nrf_drv_rtc_tick_enable(&rtc, true);
//Power on RTC instance
nrf_drv_rtc_enable(&rtc);
}
/*---------------------------------------------------------------------------*/
void
clock_init(void)
{
ticks = 0;
#ifndef SOFTDEVICE_PRESENT
lfclk_config();
#endif
rtc_config();
}
/*---------------------------------------------------------------------------*/
CCIF clock_time_t
clock_time(void)
{
return (clock_time_t)(ticks & 0xFFFFFFFF);
}
/*---------------------------------------------------------------------------*/
void
clock_update(void)
{
ticks++;
if (etimer_pending()) {
etimer_request_poll();
}
}
/*---------------------------------------------------------------------------*/
CCIF unsigned long
clock_seconds(void)
{
return (unsigned long)ticks/CLOCK_CONF_SECOND;
}
/*---------------------------------------------------------------------------*/
void
clock_wait(clock_time_t i)
{
clock_time_t start;
start = clock_time();
while (clock_time() - start < (clock_time_t)i) {
__WFE();
}
}
/*---------------------------------------------------------------------------*/
void
clock_delay_usec(uint16_t dt)
{
nrf_delay_us(dt);
}
/*---------------------------------------------------------------------------*/
/**
* \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);
}
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
* @}
*/