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85 lines
2.5 KiB
C
85 lines
2.5 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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#ifndef AD8232_H_
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#define AD8232_H_
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "upm.h"
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#include "mraa/aio.h"
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#include "mraa/gpio.h"
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#define AD8232_DEFAULT_AREF 3.3
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/**
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* @file ad8232.h
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* @library ad8232
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* @brief C API for the AD8232 Heart Rate Monitor
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*
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* @include ad8232.c
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*/
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/**
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* device context
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*/
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typedef struct _ad8232_context {
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mraa_aio_context aio;
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mraa_gpio_context gpio_lo_plus;
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mraa_gpio_context gpio_lo_minus;
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uint8_t aio_pin;
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uint8_t gpio_lo_plus_pin;
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uint8_t gpio_lo_minus_pin;
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int a_res;
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} *ad8232_context;
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/**
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* Sensor init function
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*
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* @param lo_plus Digital pin to use for LO+
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* @param lo_minus Digital pin to use for LO-
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* @param output Analog pin to read the data
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* @param a_ref Analog voltage reference
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*/
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ad8232_context ad8232_init(int lo_plus, int lo_minus, int output, float a_ref);
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/**
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* Sensor destructor
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*/
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void ad8232_close(ad8232_context dev);
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/**
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* Returns the current ADC value for the device output pin. If an
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* LO (leads off) event is detected, 0 is returned.
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*
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* @param dev sensor context pointer
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* @param value ADC value
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* @return result status code
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*/
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upm_result_t ad8232_get_value(ad8232_context dev, int* value);
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#endif /* AD8232_H_ */ |