mirror of
https://github.com/eclipse/upm.git
synced 2025-03-26 02:10:02 +03:00
81 lines
2.4 KiB
C
81 lines
2.4 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 "gp2y0a.h"
|
|
|
|
gp2y0a_context gp2y0a_init(int pin, float a_ref){
|
|
// make sure MRAA is initialized
|
|
int mraa_rv;
|
|
if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
|
|
{
|
|
printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
|
|
return NULL;
|
|
}
|
|
|
|
gp2y0a_context dev =
|
|
(gp2y0a_context) malloc(sizeof(struct _gp2y0a_context));
|
|
|
|
if (!dev)
|
|
{
|
|
printf("%s: device context allocation failed.\n",
|
|
__FUNCTION__);
|
|
return NULL;
|
|
}
|
|
|
|
memset((void *)dev, 0, sizeof(struct _gp2y0a_context));
|
|
dev->pin = pin;
|
|
dev->aio = mraa_aio_init(dev->pin);
|
|
if(dev->aio == NULL){
|
|
free(dev);
|
|
return NULL;
|
|
}
|
|
dev->a_res = (1 << mraa_aio_get_bit(dev->aio));
|
|
|
|
return dev;
|
|
}
|
|
|
|
void gp2y0a_close(gp2y0a_context dev){
|
|
free(dev);
|
|
}
|
|
|
|
upm_result_t gp2y0a_get_value(gp2y0a_context dev, float a_ref,
|
|
uint8_t samples, float* value){
|
|
int val;
|
|
int sum = 0;
|
|
int i = 0;
|
|
|
|
if (samples <= 0)
|
|
samples = 1;
|
|
|
|
for(i=0; i<samples; i++) {
|
|
val = mraa_aio_read(dev->aio);
|
|
sum += val;
|
|
}
|
|
val = sum/samples;
|
|
float volts = (float)(val * a_ref) / (float)dev->a_res;
|
|
*value = volts;
|
|
|
|
return UPM_SUCCESS;
|
|
}
|