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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* Author: Sisinty Sasmita Patra <sisinty.s.patra@intel.com>
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*
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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 <stdio.h>
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#include <stdlib.h>
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#include "temperature.h"
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#include "upm.h"
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temperature_context temperature_init(int pin)
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{
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temperature_context dev =
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(temperature_context)malloc(sizeof(struct _temperature_context));
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if (dev == NULL) return NULL;
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dev->aio = mraa_aio_init(pin);
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if(dev->aio == NULL)
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{
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free(dev);
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return NULL;
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}
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dev->m_aRes = (1 << mraa_aio_get_bit(dev->aio));
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return dev;
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}
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void temperature_close(temperature_context dev)
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{
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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 temperature_get_value(temperature_context dev,
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float* tempval)
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{
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float val = 0.0;
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val = (float)mraa_aio_read(dev->aio);
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if (val == -1.0)
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{
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return UPM_ERROR_OPERATION_FAILED;
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}
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// From old C++ UPM code, needs rework!!!
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float r = ((float)dev->m_aRes - val) * 10000.0 / val;
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float t = 1.0 / (log(r / 10000.0) / 3975.0 + 1.0 / 298.15) -273.15;
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// Celsius
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*tempval = t;
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return UPM_SUCCESS;
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}
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