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79 lines
1.6 KiB
C
79 lines
1.6 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_ccs811
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* @brief SAUL adaption for AMS CCS811 digital gas sensor 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 <stdbool.h>
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#include "phydat.h"
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#include "saul.h"
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#include "ccs811.h"
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static uint16_t _iaq_tvoc = 0;
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static uint16_t _iaq_eco2 = 0;
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static int read(const ccs811_t *dev)
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{
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/* check whether new data can be read */
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int res = ccs811_data_ready((ccs811_t *)dev);
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if (res != CCS811_OK) {
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return res;
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}
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/* read new data and save them to local storage */
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return ccs811_read_iaq((ccs811_t *)dev, &_iaq_tvoc, &_iaq_eco2, 0, 0);
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}
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static int read_tvoc(const void *dev, phydat_t *res)
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{
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/* read new data if available */
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read(dev);
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/* fill data from local storage */
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res->val[0] = _iaq_tvoc;
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res->unit = UNIT_PPB;
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res->scale = 0;
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return 1;
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}
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static int read_eco2(const void *dev, phydat_t *res)
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{
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/* read new data if available */
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read(dev);
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/* fill data from local storage */
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res->val[0] = _iaq_eco2;
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res->unit = UNIT_PPM;
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res->scale = 0;
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return 1;
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}
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const saul_driver_t ccs811_saul_driver_eco2 = {
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.read = read_eco2,
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.write = saul_notsup,
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.type = SAUL_SENSE_CO2
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};
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const saul_driver_t ccs811_saul_driver_tvoc = {
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.read = read_tvoc,
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.write = saul_notsup,
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.type = SAUL_SENSE_TVOC
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};
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