lpc2387-lpm.c
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/*
* Copyright (C) 2013, Freie Universitaet Berlin (FUB). All rights reserved.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup lpc2387
* @ingroup lpm
* @{
*/
/**
* @file
* @brief LPC2387 Low-Power management
* @ingroup lpc2387
*
* @author Heiko Will
* @version $Revision$
*
* @note $Id$
*/
#include <stdio.h>
#include <stdint.h>
#include "lpc23xx.h"
#include "lpc2387.h"
#include "lpm.h"
/* lpm is accessed before memory init and initialized separately through code */
__attribute__((section(".noinit")))
static enum lpm_mode lpm;
extern void init_clks1(void);
extern void init_clks2(void);
#define ENABLE_DEBUG (0)
#include "debug.h"
void lpm_init(void)
{
lpm = LPM_ON;
}
#define LPM_DEBUG (1)
void lpm_begin_awake(void)
{
if (lpm >= LPM_SLEEP) { // wake up from deep sleep
init_clks1();
}
}
void lpm_end_awake(void)
{
if (lpm >= LPM_SLEEP) { // wake up from deep sleep
init_clks2();
}
lpm = LPM_ON;
}
void lpm_awake(void)
{
#if LPM_DEBUG
unsigned long usec = RTC_CTC;
#endif
if (lpm >= LPM_SLEEP) { // wake up from deep sleep
/* benchmark */
init_clks1();
init_clks2();
/* Debug tests */
#if LPM_DEBUG
usec = RTC_CTC - usec;
DEBUG("Wakeup in %lu usecs\n", usec * 31);
#endif
}
lpm = LPM_ON;
}
enum lpm_mode lpm_set(enum lpm_mode target)
{
unsigned target_flags;
enum lpm_mode last_lpm = lpm;
/* calculate target mcu power mode */
if (target == LPM_IDLE) {
target_flags = PM_IDLE;
}
else if (target == LPM_SLEEP) {
target_flags = PM_SLEEP;
}
else if (target == LPM_POWERDOWN) {
target_flags = PM_POWERDOWN;
}
else {
target_flags = 0;
}
lpm = target;
DEBUG("# LPM power down %u -> %u\n", lpm, target);
PCON |= target_flags; // set target power mode
return last_lpm;
}
/*---------------------------------------------------------------------------*/
enum lpm_mode
lpm_get(void)
{
return lpm;
}
/*---------------------------------------------------------------------------*/
/** @} */