88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
|
/*
|
||
|
|
* Author: Jon Trulson <jtrulson@ics.com>
|
||
|
|
* Abhishek Malik <abhishek.malik@intel.com>
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "ad8232.h"
|
||
|
|
|
||
|
|
ad8232_context ad8232_init(int lo_plus, int lo_minus, int output,
|
||
|
|
float a_ref) {
|
||
|
|
ad8232_context dev =
|
||
|
|
(ad8232_context) malloc(sizeof(struct _ad8232_context));
|
||
|
|
|
||
|
|
if(dev == NULL){
|
||
|
|
printf("Unable to assign memory to the Heart Rate Monitor structure");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev->gpio_lo_plus_pin = lo_plus;
|
||
|
|
dev->gpio_lo_minus_pin = lo_minus;
|
||
|
|
dev->aio_pin = output;
|
||
|
|
|
||
|
|
dev->aio = mraa_aio_init(dev->aio_pin);
|
||
|
|
dev->gpio_lo_plus = mraa_gpio_init(dev->gpio_lo_plus_pin);
|
||
|
|
dev->gpio_lo_minus = mraa_gpio_init(dev->gpio_lo_minus_pin);
|
||
|
|
|
||
|
|
if (dev->aio == NULL || dev->gpio_lo_minus == NULL ||
|
||
|
|
dev->gpio_lo_plus == NULL){
|
||
|
|
printf("The pins did not initialize correctly");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mraa_gpio_dir(dev->gpio_lo_minus, MRAA_GPIO_IN) != MRAA_SUCCESS ||
|
||
|
|
mraa_gpio_dir(dev->gpio_lo_plus, MRAA_GPIO_IN) != MRAA_SUCCESS){
|
||
|
|
printf("Couldn't set the direction for the GPIO pins");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev->a_res = (1 << mraa_aio_get_bit(dev->aio));
|
||
|
|
return dev;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ad8232_close(ad8232_context dev){
|
||
|
|
if (dev->gpio_lo_minus != NULL)
|
||
|
|
mraa_gpio_close(dev->gpio_lo_minus);
|
||
|
|
if (dev->gpio_lo_plus != NULL)
|
||
|
|
mraa_gpio_close(dev->gpio_lo_plus);
|
||
|
|
if (dev->aio != NULL)
|
||
|
|
mraa_aio_close(dev->aio);
|
||
|
|
|
||
|
|
free(dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
upm_result_t ad8232_get_value(ad8232_context dev, int* value) {
|
||
|
|
int reading = 0;
|
||
|
|
|
||
|
|
if (mraa_gpio_read(dev->gpio_lo_minus) ||
|
||
|
|
mraa_gpio_read(dev->gpio_lo_plus)) {
|
||
|
|
reading = 0;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
reading = mraa_aio_read(dev->aio);
|
||
|
|
}
|
||
|
|
|
||
|
|
*value = reading;
|
||
|
|
|
||
|
|
return UPM_SUCCESS;
|
||
|
|
}
|