71 lines
1.9 KiB
C
71 lines
1.9 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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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "ad8232.h"
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ad8232_context ad8232_init(int lo_plus, int lo_minus, int output,
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float a_ref) {
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ad8232_context dev =
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(ad8232_context) malloc(sizeof(struct _ad8232_context));
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if(dev == NULL){
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printf("Unable to assign memory to the Heart Rate Monitor structure");
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return NULL;
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}
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dev->aio = mraa_aio_init(output);
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dev->gpio_lo_plus = mraa_gpio_init(lo_plus);
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dev->gpio_lo_minus = mraa_gpio_init(lo_minus);
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if (dev->aio == NULL || dev->gpio_lo_minus == NULL ||
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dev->gpio_lo_plus == NULL){
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printf("The pins did not initialize correctly");
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return NULL;
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}
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if (mraa_gpio_dir(dev->gpio_lo_minus, MRAA_GPIO_IN) != MRAA_SUCCESS ||
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mraa_gpio_dir(dev->gpio_lo_plus, MRAA_GPIO_IN) != MRAA_SUCCESS){
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printf("Couldn't set the direction for the GPIO pins");
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return NULL;
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}
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dev->a_res = (1 << mraa_aio_get_bit(dev->aio));
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return dev;
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}
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void ad8232_close(ad8232_context dev){
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if (dev->gpio_lo_minus != NULL)
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mraa_gpio_close(dev->gpio_lo_minus);
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if (dev->gpio_lo_plus != NULL)
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mraa_gpio_close(dev->gpio_lo_plus);
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if (dev->aio != NULL)
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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 ad8232_get_value(ad8232_context dev, int* value) {
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int reading = 0;
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if (mraa_gpio_read(dev->gpio_lo_minus) ||
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mraa_gpio_read(dev->gpio_lo_plus)) {
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reading = 0;
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}
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else {
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reading = mraa_aio_read(dev->aio);
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}
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*value = reading;
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return UPM_SUCCESS;
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}
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