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68 lines
1.9 KiB
68 lines
1.9 KiB
/* |
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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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