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3ca1162a6a
The SAUL implementation of the BMx280 currently returns the pressure in hPa. The sensor, however, actually reads the pressure in Pa, leading to a significant loss of precision. Because the operation range of the BME280 and BMP280 is 300 hPa to 1100 hPa, we can safely increase the precision by a factor of 10 without risk of overflow. The only downside is that readings are now presented as `e1 Pa` (eg 10206e1 Pa).
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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* Copyright (C) 2016 Kees Bakker, SODAQ
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* 2017 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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* @ingroup drivers_bmx280
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* @{
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*
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* @file
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* @brief SAUL adoption for BMX280 sensors (BME280 and BMP280).
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*
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* @author Kees Bakker <kees@sodaq.com>
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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 "saul.h"
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#include "bmx280.h"
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static int read_temperature(const void *dev, phydat_t *res)
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{
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res->val[0] = bmx280_read_temperature((bmx280_t *)dev);
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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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static int read_pressure(const void *dev, phydat_t *res)
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{
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res->unit = UNIT_PA;
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res->scale = 0;
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int32_t val = bmx280_read_pressure((bmx280_t *)dev);
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phydat_fit(res, &val, 1);
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return 1;
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}
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#if defined(MODULE_BME280_SPI) || defined(MODULE_BME280_I2C)
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static int read_relative_humidity(const void *dev, phydat_t *res)
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{
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res->val[0] = bme280_read_humidity((bmx280_t *)dev);
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res->unit = UNIT_PERCENT;
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res->scale = -2;
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return 1;
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}
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#endif
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const saul_driver_t bmx280_temperature_saul_driver = {
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.read = read_temperature,
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.write = saul_notsup,
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.type = SAUL_SENSE_TEMP,
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};
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const saul_driver_t bmx280_pressure_saul_driver = {
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.read = read_pressure,
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.write = saul_notsup,
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.type = SAUL_SENSE_PRESS,
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};
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#if defined(MODULE_BME280_SPI) || defined(MODULE_BME280_I2C)
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const saul_driver_t bme280_relative_humidity_saul_driver = {
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.read = read_relative_humidity,
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.write = saul_notsup,
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.type = SAUL_SENSE_HUM,
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};
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#endif
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