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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.
78 lines
1.8 KiB
C
78 lines
1.8 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 bool _data_ready = false;
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static int read(const ccs811_t *dev, uint16_t *iaq_tvoc, uint16_t *iaq_eco2)
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{
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if (!_data_ready) {
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/* if no data were ready yet, test for new data */
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if (ccs811_data_ready(dev) == CCS811_OK) {
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_data_ready = true;
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}
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else {
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return -ECANCELED;
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}
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}
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int res = ccs811_read_iaq(dev, iaq_tvoc, iaq_eco2, NULL, NULL);
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/* in case of CCS811_ERROR_NO_NEW_DATA last valid data are returned */
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return (res == CCS811_OK ||
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res == -CCS811_ERROR_NO_NEW_DATA) ? 0 : -ECANCELED;
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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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if (read(dev, (uint16_t*)&res->val[0], NULL) != 0) {
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return -ECANCELED;
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}
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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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if (read(dev, NULL, (uint16_t*)&res->val[0]) != 0) {
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return -ECANCELED;
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}
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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_write_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_write_notsup,
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.type = SAUL_SENSE_TVOC
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};
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