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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.
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/*
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* Copyright 2018 Otto-von-Guericke-Universität Magdeburg
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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_sht1x
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* @{
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*
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* @file
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* @brief SAUL adaption for SHT10/SHT11/SHT15 devices
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*
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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* @}
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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 "sht1x_defines.h"
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#include "sht1x.h"
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static int read(const sht1x_dev_t *dev, int16_t *temp, int16_t *hum)
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{
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for (int retries = 0; retries < SHT1X_SAUL_RETRIES; retries++) {
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switch (sht1x_read(dev, temp, hum)) {
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case 0:
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return 0;
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case -EBADMSG:
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puts("[sht1x] CRC");
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continue;
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case -EPROTO:
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puts("[sht1x] Sensor did not acknowledge measurement command");
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continue;
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case -ECANCELED:
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puts("[sht1x] Measurement times out");
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/* falls through */
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default:
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/* Other failure, cannot recover so giving up */
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return -1;
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}
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}
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printf("[sht1x] Giving up after %i tries\n", SHT1X_SAUL_RETRIES);
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return -1;
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}
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static int read_temp(const void *dev, phydat_t *res)
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{
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if (read(dev, &res->val[0], NULL) == 0) {
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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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return -ECANCELED;
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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 (read(dev, NULL, &res->val[0]) == 0) {
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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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return -ECANCELED;
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}
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const saul_driver_t sht1x_saul_temp_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 sht1x_saul_hum_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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