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16f859dafd
This makes life easier when calling e.g. `saul_reg_write()` with data stored in flash. As now the signatures for reading and writing differ (in that `const` qualifier only), `saul_notsup()` is split into `saul_write_notsup()` and `saul_read_notsup()`. However, one is implemented as a symbol alias of the other, so that ROM consumption remains unchanged.
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* Copyright (C) 2019 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*
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*/
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/**
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* @ingroup cpu_nrf5x_common
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* @{
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*
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* @file
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* @brief Implementation of the temperature peripheral internal driver
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*
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* @author Alexandre Abadie <alexandre.abadie@inria.fr>
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*
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* @}
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*/
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#include "cpu.h"
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#include "saul.h"
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#include "saul_reg.h"
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#include "phydat.h"
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/**
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* @brief Read the temperature in E-02 °C
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* @return The measured temperature in E-02 °C (e.g. 1825 would mean 18.25 °C)
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*/
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static int16_t temperature_read(void)
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{
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/* Start temperature measurement task */
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NRF_TEMP->TASKS_START = 1;
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/* Wait for temperature measurement to be ready */
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while (!NRF_TEMP->EVENTS_DATARDY); /* takes 36us according to manual */
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/* temperature is in 0.25°C step, multiply by 25 to convert to E-02 °C */
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int32_t temp = NRF_TEMP->TEMP * 25;
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/* Clear data ready bit and stop temperature measurement task */
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NRF_TEMP->EVENTS_DATARDY = 0;
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NRF_TEMP->TASKS_STOP = 1;
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return temp;
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}
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static int _read_temperature(const void *dev, phydat_t *res)
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{
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(void)dev;
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res->val[0] = temperature_read();
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res->val[1] = 0;
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res->val[2] = 0;
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res->unit = UNIT_TEMP_C;
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res->scale = -2;
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return 1;
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}
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const saul_reg_info_t nrf_temperature_saul_info = {
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.name = "NRF_TEMP"
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};
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const saul_driver_t nrf_temperature_saul_driver = {
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.read = _read_temperature,
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.write = saul_write_notsup,
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.type = SAUL_SENSE_TEMP,
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};
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