69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
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* lowPower.c:
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* Check the Pi's LOW-Power signal.
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*
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* This is a demonstration program that could be turned into some sort
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* of logger via e.g. syslog - however it's also probably something
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* that might be better handled by a future kernel - who knows.
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*
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* Copyright (c) 2014 Gordon Henderson.
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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#include <stdio.h>
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#include <time.h>
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#include <wiringPi.h>
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#define LOW_POWER 35
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/*
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* lowPower:
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* This is an ISR that waits for the low-power signal going low and
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* prints the result.
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*********************************************************************************
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*/
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void lowPower (void)
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{
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time_t t ;
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time (&t) ;
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printf ("%s: LOW POWER DETECTED\n", ctime (&t)) ;
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}
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/*
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*********************************************************************************
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* main
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*********************************************************************************
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*/
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int main (void)
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{
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wiringPiSetupGpio () ; // GPIO mode as it's an internal pin
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wiringPiISR (LOW_POWER, INT_EDGE_FALLING, &lowPower) ;
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for (;;)
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delay (1000) ;
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return 0 ;
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}
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