IDE: SEGGER Embedded Studio for ARM V6.30
SDK: nRF5_SDK_17.1.0
nrf52832는 내부 온도센서를 가지고 있습니다.
온도값의 범위는 디바이스의 동작 온도보다 크거나 같습니다.
온도값의 분해능은 0.25도로 레지스터 값이 4일 때 1도를 나타냅니다.
이를 사용하기 위해 SDK에서는 예제 프로그램도 제공되고 있습니다.
>> nRF5_SDK_17.1.0_ddde560\examples\peripheral\temperature
/**
* Copyright (c) 2014 - 2021, Nordic Semiconductor ASA
*
* 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, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, 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 Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
*
*/
/** @file
* @defgroup temperature_example_main main.c
* @{
* @ingroup temperature_example
* @brief Temperature Example Application main file.
* @details
* This file contains the source code for a sample application using the temperature sensor.
* This contains workaround for PAN_028 rev2.0A anomalies 28, 29,30 and 31. PAN 43 is not covered.
* - PAN_028 rev2.0A anomaly 28 - TEMP: Negative measured values are not represented correctly
* - PAN_028 rev2.0A anomaly 29 - TEMP: Stop task clears the TEMP register.
* - PAN_028 rev2.0A anomaly 30 - TEMP: Temp module analog front end does not power down when DATARDY event occurs.
* - PAN_028 rev2.0A anomaly 31 - TEMP: Temperature offset value has to be manually loaded to the TEMP module
* - PAN_028 rev2.0A anomaly 43 - TEMP: Using PPI between DATARDY event and START task is not functional.
*
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "nrf.h"
#include "nrf_delay.h"
#include "nrf_temp.h"
#include "app_error.h"
#include "bsp.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/** @brief Function for main application entry.
*/
int main(void)
{
// This function contains workaround for PAN_028 rev2.0A anomalies 28, 29,30 and 31.
int32_t volatile temp;
nrf_temp_init();
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("Temperature example started.");
while (true)
{
NRF_TEMP->TASKS_START = 1; /** Start the temperature measurement. */
/* Busy wait while temperature measurement is not finished, you can skip waiting if you enable interrupt for DATARDY event and read the result in the interrupt. */
/*lint -e{845} // A zero has been given as right argument to operator '|'" */
while (NRF_TEMP->EVENTS_DATARDY == 0)
{
// Do nothing.
}
NRF_TEMP->EVENTS_DATARDY = 0;
/**@note Workaround for PAN_028 rev2.0A anomaly 29 - TEMP: Stop task clears the TEMP register. */
temp = (nrf_temp_read() / 4);
/**@note Workaround for PAN_028 rev2.0A anomaly 30 - TEMP: Temp module analog front end does not power down when DATARDY event occurs. */
NRF_TEMP->TASKS_STOP = 1; /** Stop the temperature measurement. */
NRF_LOG_INFO("Actual temperature: %d", (int)temp);
nrf_delay_ms(500);
NRF_LOG_FLUSH();
}
}
/** @} */
위는 500ms마다 온도 값을 읽는 동작을 하는 코드입니다.
위 코드를 참조하여 다른 ble_app_uart 와 같은 예제 프로그램에서 적용하니까 다음과 같은 에러가 나타나면서 Hard Fault가 발생하는 것을 보게 됩니다.
SOFTDEVICE: INVALID MEMORY ACCESS
SOFTDEVICE를 사용하면 메모리에 직접 접근이 안되서 나타나는 현상으로
다음과 같은 코드로 내부 온도 값을 읽을 수 있습니다.
int32_t temp;
sd_temp_get(&temp);
temp = (int)temp / 4;
참조
nRF52832 Product Specification (nordicsemi.com)
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