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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.
122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
/*
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* Copyright (C) 2018 Gunar Schorcht
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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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* @ingroup drivers_sht3x
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* @brief SAUL adaption for Sensirion SHT30/SHT31/SHT35 devices
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* @author Gunar Schorcht <gunar@schorcht.net>
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* @file
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "phydat.h"
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#include "saul.h"
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#include "sht3x.h"
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#include "sht3x_params.h"
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#define SHT3X_NUM ARRAY_SIZE(sht3x_params)
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extern sht3x_dev_t sht3x_devs[SHT3X_NUM];
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/**
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* Humidity and temperature sensor values are fetched by separate saul
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* functions. To avoid double waiting for the sensor and readout of the
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* sensor values, we read both sensor values once, if necessary, and
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* store them in local variables to provide them in the separate saul
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* read functions.
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*/
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static bool _temp_valid[SHT3X_NUM] = { false };
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static bool _hum_valid[SHT3X_NUM] = { false };
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static int16_t _temp[SHT3X_NUM];
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static int16_t _hum[SHT3X_NUM];
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static unsigned _dev2index (const sht3x_dev_t *dev)
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{
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/*
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* returns the index of the device in sht3x_devs[] or SHT3_NUM
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* if not found
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*/
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for (unsigned i = 0; i < SHT3X_NUM; i++) {
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if (dev == &sht3x_devs[i]) {
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return i;
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}
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}
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return SHT3X_NUM;
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}
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static int _read(int dev)
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{
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/* read both sensor values */
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unsigned res = sht3x_read(&sht3x_devs[dev], &_temp[dev], &_hum[dev]);
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if (res != SHT3X_OK) {
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return res;
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}
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/* mark both sensor values as valid */
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_temp_valid[dev] = true;
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_hum_valid[dev] = true;
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return SHT3X_OK;
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}
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static int read_temp(const void *dev, phydat_t *data)
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{
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/* find the device index */
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unsigned dev_index = _dev2index((const sht3x_dev_t *)dev);
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if (dev_index == SHT3X_NUM) {
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/* return with error if device index could not be found */
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return -ECANCELED;
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}
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/* either local variable is valid or fetching it was successful */
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if (_temp_valid[dev_index] || _read(dev_index) == SHT3X_OK) {
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/* mark local variable as invalid */
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_temp_valid[dev_index] = false;
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data->val[0] = _temp[dev_index];
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data->unit = UNIT_TEMP_C;
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data->scale = -2;
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return 1;
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}
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return -ECANCELED;
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}
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static int read_hum(const void *dev, phydat_t *data)
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{
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/* find the device index */
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unsigned dev_index = _dev2index((const sht3x_dev_t *)dev);
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if (dev_index == SHT3X_NUM) {
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/* return with error if device index could not be found */
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return -ECANCELED;
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}
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/* either local variable is valid or fetching it was successful */
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if (_hum_valid[dev_index] || _read(dev_index) == SHT3X_OK) {
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/* mark local variable as invalid */
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_hum_valid[dev_index] = false;
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data->val[0] = _hum[dev_index];
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data->unit = UNIT_PERCENT;
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data->scale = -2;
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return 1;
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}
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return -ECANCELED;
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}
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const saul_driver_t sht3x_saul_driver_temperature = {
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.read = read_temp,
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.write = saul_write_notsup,
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.type = SAUL_SENSE_TEMP
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};
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const saul_driver_t sht3x_saul_driver_humidity = {
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.read = read_hum,
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.write = saul_write_notsup,
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.type = SAUL_SENSE_HUM
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};
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