upm/examples/c/wfs.c

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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2014-02017 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 <unistd.h>
#include <stdio.h>
#include <signal.h>
#include <upm_utilities.h>
#include "wfs.h"
int shouldRun = true;
void sig_handler(int signo)
{
if (signo == SIGINT)
shouldRun = false;
}
int main(int argc, char **argv)
{
signal(SIGINT, sig_handler);
//! [Interesting]
// Instantiate a Water Flow Sensor on digital pin D2. This must
// be an interrupt capable pin.
wfs_context sensor = wfs_init(2);
if (!sensor)
{
printf("%s: wfs_init() failed\n", __FUNCTION__);
return 1;
}
// set the flow counter to 0 and start counting
wfs_clear_flow_counter(sensor);
if (wfs_start_flow_counter(sensor))
{
printf("%s: wfs_start_flow_counter() failed\n", __FUNCTION__);
wfs_close(sensor);
return 1;
}
while (shouldRun)
{
// we grab these (millis and flowCount) just for display
// purposes in this example
uint32_t millis = wfs_get_millis(sensor);
uint32_t flowCount = wfs_flow_counter(sensor);
float fr = wfs_flow_rate(sensor);
// output milliseconds passed, flow count, and computed flow rate
printf("Millis: %8d Flow Count: %5d Flow Rate: %f LPM\n",
millis, flowCount, fr);
// best to gather data for at least one second for reasonable
// results.
upm_delay(2);
}
wfs_stop_flow_counter(sensor);
printf("Exiting...\n");
wfs_close(sensor);
//! [Interesting]
return 0;
}