From 83f4265644321022cce13d0e4f5a5f5335a4d7a9 Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Mon, 26 Sep 2011 19:35:24 +0200 Subject: src/binwatch, src/common: add power reduction and sleep when waiting button --- src/common/power.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 src/common/power.c (limited to 'src/common/power.c') diff --git a/src/common/power.c b/src/common/power.c new file mode 100644 index 0000000..c7a5aab --- /dev/null +++ b/src/common/power.c @@ -0,0 +1,55 @@ +/* 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) +{ + /* 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 (); +} + -- cgit v1.2.3