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https://github.com/eclipse/upm.git
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0e52ea619b
Added the C source for the gsr sensor with necessary changes to cmake,
examples, docs.
* Renamed all files with grovegsr to gsr
* Replaced all instances of grovegsr with gsr
* Added C source for gsr sensor
* Updated all cmake files
* Added C example for gsr sensor
* Fixed C++ threshold method from throwing on a successfull aio read
Signed-off-by: Noel Eck <noel.eck@intel.com>
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/*
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* Author:
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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 "gsr.h"
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gsr_context gsr_init(int16_t pin)
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{
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gsr_context dev = (gsr_context) malloc(sizeof(struct _gsr_context));
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if (dev == NULL)
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return NULL;
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/* Init aio pin */
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dev->aio = mraa_aio_init(pin);
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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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/* Set the ADC ref, scale, and offset defaults */
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dev->m_aRef = 5.0;
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dev->m_scale = 1.0;
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dev->m_offset = 0.0;
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return dev;
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}
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void gsr_close(gsr_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 gsr_set_aref(const gsr_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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upm_result_t gsr_set_scale(const gsr_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 gsr_set_offset(const gsr_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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float gsr_get_aref(const gsr_context dev)
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{
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return dev->m_aRef;
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}
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float gsr_get_scale(const gsr_context dev)
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{
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return dev->m_scale;
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}
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float gsr_get_offset(const gsr_context dev)
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{
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return dev->m_offset;
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}
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upm_result_t gsr_get_normalized(const gsr_context dev, float *value)
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{
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*value = mraa_aio_read_float(dev->aio);
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if (*value < 0)
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return UPM_ERROR_OPERATION_FAILED;
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}
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upm_result_t gsr_get_raw_volts(const gsr_context dev, float *value)
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{
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*value = mraa_aio_read_float(dev->aio);
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if (*value < 0)
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return UPM_ERROR_OPERATION_FAILED;
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/* Scale by the ADC reference voltage */
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*value *= dev->m_aRef;
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return UPM_SUCCESS;
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}
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upm_result_t gsr_get_volts(const gsr_context dev, float *value)
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{
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*value = mraa_aio_read_float(dev->aio);
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if (*value < 0)
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return UPM_ERROR_OPERATION_FAILED;
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/* Apply raw scale */
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*value *= dev->m_scale;
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/* Scale to aRef */
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*value *= dev->m_aRef;
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/* Apply the offset in volts */
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*value += dev->m_offset;
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return UPM_SUCCESS;
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}
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