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70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Abhishek Malik <abhishek.malik@intel.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "moisture.h"
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moisture_context moisture_init(int pin) {
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// make sure MRAA is initialized
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int mraa_rv;
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if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
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{
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printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
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return NULL;
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}
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moisture_context dev =
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(moisture_context) malloc(sizeof(struct _moisture_context));
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if (dev == NULL) {
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printf("Unable to allocate memory for device context\n");
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return NULL;
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}
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dev->analog_pin = pin;
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dev->aio = mraa_aio_init(dev->analog_pin);
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if (dev->aio == NULL) {
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printf("mraa_aio_init() failed.\n");
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free(dev);
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return NULL;
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}
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return dev;
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}
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void moisture_close(moisture_context dev) {
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mraa_aio_close(dev->aio);
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free(dev);
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}
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upm_result_t moisture_get_moisture(moisture_context dev,
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int* moisture) {
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*moisture = mraa_aio_read(dev->aio);
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return UPM_SUCCESS;
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}
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