/* power.c */ /* binwatch - Tiny binary wristwatch. {{{ * * Copyright (C) 2011 Nicolas Schodet * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Contact : * Web: http://ni.fr.eu.org/ * Email: * }}} */ #include "common.h" #include "power.h" #include "io.h" #include void power_init (void) { /* Change initial clock. */ power_clock_prescale_set (AC_POWER_CLKPS_INITIAL); /* Shutdown unused peripherals. */ /* Analog comparator. */ ACSR = _BV (ACD); /* Timers, USI and ADC. */ PRR = _BV (PRTIM1) | _BV (PRTIM0) | _BV (PRUSI) | _BV (PRADC); /* B3, B4, B5 input values are never read. */ DIDR0 = 0b111000; } void power_sleep (void) { /* Enable interrupts right before sleep instruction so that any pending * interrupt will occur after the processor go to sleep and really wake * the processor. See avr-libc documentation. */ set_sleep_mode (SLEEP_MODE_PWR_DOWN); sleep_enable (); sei (); sleep_cpu (); sleep_disable (); cli (); }