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118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/*
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* Author: Noel Eck <noel.eck@intel.com>
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* Copyright (c) 2015 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 <string.h>
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#include <stdlib.h>
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#include "dfrph.h"
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dfrph_context dfrph_init(int16_t pin)
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{
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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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dfrph_context dev =
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(dfrph_context) malloc(sizeof(struct _dfrph_context));
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if(dev == NULL) return NULL;
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/* Init aio pin */
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dev->aio = mraa_aio_init(pin);
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/* Set the ref, offset, and scale */
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dev->m_aref = 5.0;
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dev->m_offset = 0.0;
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dev->m_scale = 1.0;
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if(dev->aio == NULL) {
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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 dfrph_close(dfrph_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 dfrph_set_aref(const dfrph_context dev, float aref)
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{
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dev->m_aref = aref;
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return UPM_SUCCESS;
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}
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float dfrph_get_aref(const dfrph_context dev)
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{
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return dev->m_aref;
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}
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upm_result_t dfrph_set_offset(const dfrph_context dev, float offset)
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{
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dev->m_offset = offset;
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return UPM_SUCCESS;
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}
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upm_result_t dfrph_set_scale(const dfrph_context dev, float scale)
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{
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dev->m_scale = scale;
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return UPM_SUCCESS;
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}
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upm_result_t dfrph_get_raw_volts(const dfrph_context dev, float *volts)
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{
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*volts = mraa_aio_read_float(dev->aio);
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if (*volts == -1.0) return UPM_ERROR_OPERATION_FAILED;
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/* Scale by aref */
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*volts *= dev->m_aref;
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return UPM_SUCCESS;
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}
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upm_result_t dfrph_get_ph(const dfrph_context dev, float *value)
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{
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/* Read normalized */
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*value = mraa_aio_read_float(dev->aio);
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if (*value < 0.0) return UPM_ERROR_OPERATION_FAILED;
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/* Apply scale */
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*value *= dev->m_scale;
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/* Vmax for sensor is 0.8 * Vref, so scale by 1/0.8 = 1.25 */
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*value *= 1.25 * 14; /* Convert to pH */
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/* Apply offset in pH */
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*value += dev->m_offset;
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return UPM_SUCCESS;
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}
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