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135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/******************************************************************************
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Copyright 2009, Freie Universitaet Berlin (FUB). All rights reserved.
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These sources were developed at the Freie Universitaet Berlin, Computer Systems
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and Telematics group (http://cst.mi.fu-berlin.de).
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-------------------------------------------------------------------------------
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This file is part of FeuerWare.
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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FeuerWare is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see http://www.gnu.org/licenses/ .
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--------------------------------------------------------------------------------
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For further information and questions please use the web site
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http://scatterweb.mi.fu-berlin.de
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and the mailinglist (subscription via web site)
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scatterweb@lists.spline.inf.fu-berlin.de
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*******************************************************************************/
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/**
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* @ingroup lpc2387
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* @{
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*/
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/**
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* @file
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* @brief LPC2387 Low-Power management
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* @ingroup lpc2387
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*
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* @author Freie Universität Berlin, Computer Systems & Telematics, FeuerWhere project
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* @author Heiko Will
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* @version $Revision$
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*
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* @note $Id$
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include "board.h"
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#include "lpc23xx.h"
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#include "lpc2387.h"
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#include "lpm.h"
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/* lpm is accessed before memory init and initialized separately through code */
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__attribute__((section(".noinit")))
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static enum lpm_mode lpm;
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extern void init_clks1(void);
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extern void init_clks2(void);
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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void
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lpm_init(void)
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{
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lpm = LPM_ON;
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}
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#define LPM_DEBUG 0
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void lpm_begin_awake(void) {
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if (lpm >= LPM_SLEEP ) { // wake up from deep sleep
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init_clks1();
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}
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}
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void lpm_end_awake(void) {
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if( lpm >= LPM_SLEEP ) { // wake up from deep sleep
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init_clks2();
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}
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lpm = LPM_ON;
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}
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void lpm_awake(void) {
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#if LPM_DEBUG
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unsigned long usec = RTC_CTC;
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#endif
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if( lpm >= LPM_SLEEP ) { // wake up from deep sleep
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//benchmark
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init_clks1();
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init_clks2();
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// Debug tests
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#if LPM_DEBUG
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usec = RTC_CTC-usec;
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printf("Wakeup in %lu usecs\n",usec * 31);
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#endif
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}
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lpm = LPM_ON;
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}
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enum lpm_mode lpm_set(enum lpm_mode target) {
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unsigned target_flags;
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enum lpm_mode last_lpm = lpm;
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/* calculate target mcu power mode */
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if( target == LPM_IDLE )
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target_flags = PM_IDLE;
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else if( target == LPM_SLEEP )
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target_flags = PM_SLEEP;
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else if( target == LPM_POWERDOWN )
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target_flags = PM_POWERDOWN;
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else
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target_flags = 0;
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lpm = target;
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#if DEBUG
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PRINTF("# LPM power down %u -> %u", lpm, target);
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#endif
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PCON |= target_flags; // set target power mode
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return last_lpm;
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}
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/*---------------------------------------------------------------------------*/
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enum lpm_mode
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lpm_get(void) {
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return lpm;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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