nes-proj/arch/platform/nrf52dk/dev/temperature-sensor.c

119 lines
3.5 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 Institute 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 INSTITUTE 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 INSTITUTE 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 nrf52dk-devices Device drivers
* @{
*
* \addtogroup nrf52dk-devices-temp Temperature sensor driver
* This is a driver for nRF52832 hardware sensor.
*
* @{
*
* \file
* Temperature sensor implementation.
* \author
* Wojciech Bober <wojciech.bober@nordicsemi.no>
*
*/
#ifndef SOFTDEVICE_PRESENT
#include "nrf_temp.h"
#else
#include "nrf_soc.h"
#endif
#include "contiki.h"
#include "dev/temperature-sensor.h"
const struct sensors_sensor temperature_sensor;
/*---------------------------------------------------------------------------*/
/**
* \brief Returns device temperature
* \param type ignored
* \return Device temperature in degrees Celsius
*/
static int
value(int type)
{
#ifndef SOFTDEVICE_PRESENT
int32_t volatile temp;
NRF_TEMP->TASKS_START = 1;
/* nRF52832 datasheet: one temperature measurement takes typically 36 us */
RTIMER_BUSYWAIT_UNTIL(NRF_TEMP->EVENTS_DATARDY, RTIMER_SECOND * 72 / 1000000);
NRF_TEMP->EVENTS_DATARDY = 0;
temp = nrf_temp_read();
NRF_TEMP->TASKS_STOP = 1;
return temp;
#else
int32_t temp;
sd_temp_get(&temp);
return temp >> 2;
#endif
}
/*---------------------------------------------------------------------------*/
/**
* \brief Configures temperature sensor
* \param type initializes the hardware sensor when \a type is set to
* \a SENSORS_HW_INIT
* \param c ignored
* \return 1
* \note This function does nothing when SoftDevice is present
*/
static int
configure(int type, int c)
{
#ifndef SOFTDEVICE_PRESENT
if (type == SENSORS_HW_INIT) {
nrf_temp_init();
}
#endif
return 1;
}
/**
* \brief Return temperature sensor status
* \param type ignored
* \return 1
*/
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
return 1;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(temperature_sensor, TEMPERATURE_SENSOR, value, configure, status);
/**
* @}
* @}
*/