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e2bec11c23
Added the C source for the flex sensor with necessary changes to cmake, examples, and docs. Signed-off-by: Noel Eck <noel.eck@intel.com>
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <unistd.h>
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#include <signal.h>
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#include "flex.h"
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bool shouldRun = true;
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void sig_handler(int signo)
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{
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if (signo == SIGINT)
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shouldRun = false;
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}
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int main()
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{
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signal(SIGINT, sig_handler);
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//! [Interesting]
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// Instantiate a flex sensor on analog pin A0
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flex_context sensor = flex_init(0);
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if (!sensor)
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{
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printf("flex_init() failed.\n");
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return -1;
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}
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// Set the aref, scale, and offset
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flex_set_aref(sensor, 5.0);
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flex_set_scale(sensor, 1.0);
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flex_set_offset(sensor, -.1);
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printf("aRef: %0.03f scale: %0.03f offset: %0.03f\n\n",
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flex_get_aref(sensor),
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flex_get_scale(sensor),
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flex_get_offset(sensor));
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// Every half a second, sample the sensor output
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while (shouldRun)
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{
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float normalized = 0.0;
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float raw_volts = 0.0;
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float volts = 0.0;
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flex_get_normalized(sensor, &normalized);
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flex_get_raw_volts(sensor, &raw_volts);
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flex_get_volts(sensor, &volts);
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printf("Normalized output: %0.03f, raw flex sensor output: %0.03f v "
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"adjusted output: %0.03f v\n", normalized, raw_volts, volts);
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usleep(500000);
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}
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//! [Interesting]
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printf("Exiting\n");
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flex_close(sensor);
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return 0;
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}
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