/* * Author: Jon Trulson * Abhishek Malik * Copyright (c) 2016 Intel Corporation. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef AD8232_H_ #define AD8232_H_ #include #include #include #include "upm.h" #include "mraa/aio.h" #include "mraa/gpio.h" #define AD8232_DEFAULT_AREF 3.3 /** * @file ad8232.h * @library ad8232 * @brief C API for the AD8232 Heart Rate Monitor * * @include ad8232.c */ /** * device context */ typedef struct _ad8232_context { mraa_aio_context aio; mraa_gpio_context gpio_lo_plus; mraa_gpio_context gpio_lo_minus; uint8_t aio_pin; uint8_t gpio_lo_plus_pin; uint8_t gpio_lo_minus_pin; int a_res; } *ad8232_context; /** * Sensor init function * * @param lo_plus Digital pin to use for LO+ * @param lo_minus Digital pin to use for LO- * @param output Analog pin to read the data * @param a_ref Analog voltage reference */ ad8232_context ad8232_init(int lo_plus, int lo_minus, int output, float a_ref); /** * Sensor destructor */ void ad8232_close(ad8232_context dev); /** * Returns the current ADC value for the device output pin. If an * LO (leads off) event is detected, 0 is returned. * * @param dev sensor context pointer * @param value ADC value * @return result status code */ upm_result_t ad8232_get_value(ad8232_context dev, int* value); #endif /* AD8232_H_ */