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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.
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* Copyright (C) 2016 Freie Universität Berlin
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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_dht
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* @{
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*
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* @file
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* @brief SAUL adaption for DHT devices
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*
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* The values exported to SAUL for DHT devices are buffered, meaning that new
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* values will only be read from the device, if the buffered values are older
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* then 1 second (being exactly the maximum sampling time for DHT devices).
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*
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* This buffering does further introduce a coupling between both SAUL endpoints,
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* meaning that if you read from both endpoints after each other, both values
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* are from the same sensor reading.
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <string.h>
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#include "saul.h"
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#include "dht.h"
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static int read_temp(const void *dev, phydat_t *res)
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{
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if (dht_read((dht_t *)dev, &res->val[0], NULL)) {
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return -ECANCELED;
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}
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res->unit = UNIT_TEMP_C;
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res->scale = -1;
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return 1;
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}
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static int read_hum(const void *dev, phydat_t *res)
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{
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if (dht_read((dht_t *)dev, NULL, &res->val[0])) {
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return -ECANCELED;
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}
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res->unit = UNIT_PERCENT;
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res->scale = -1;
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return 1;
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}
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const saul_driver_t dht_temp_saul_driver = {
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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 dht_hum_saul_driver = {
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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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