lpm_arch.c
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/*
* Copyright (C) 2014 Freie Universität Berlin
* Copyright (C) 2015 Saurabh Singh
*
* 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 cpu_samd21
* @{
*
* @file
* @brief Implementation of the kernels power management interface
*
* @author Thomas Eichinger <thomas.eichinger@fu-berlin.de>
* @author Saurabh Singh <saurabh@cezy.co>
*
* @}
*/
#include "cpu.h"
#include "arch/lpm_arch.h"
enum system_sleepmode {
/**
* Idle 0 mode.
* Potential Wake Up sources: Synchronous(APB, AHB), asynchronous.
*/
SYSTEM_SLEEPMODE_IDLE_0,
/**
* Idle 1 mode.
* Potential Wake Up sources: Synchronous (APB), asynchronous
*/
SYSTEM_SLEEPMODE_IDLE_1,
/**
* Idle 2 mode.
* Potential Wake Up sources: Asynchronous
*/
SYSTEM_SLEEPMODE_IDLE_2,
/**
* Standby mode.
* Potential Wake Up sources: Asynchronous
*/
SYSTEM_SLEEPMODE_STANDBY,
};
static enum lpm_mode current_mode;
static void start_lpm(void);
void lpm_arch_init(void)
{
current_mode = LPM_ON;
}
enum lpm_mode lpm_arch_set(enum lpm_mode target)
{
enum lpm_mode last_mode = current_mode;
switch (target) {
case LPM_ON: /* Run mode */
current_mode = LPM_ON;
break;
case LPM_IDLE: /* Sleep mode Idle 0 */
current_mode = LPM_IDLE;
/* Idle Mode 0 */
SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
PM->SLEEP.reg = SYSTEM_SLEEPMODE_IDLE_0;
start_lpm();
break;
case LPM_SLEEP: /* Sleep mode Idle 1 */
current_mode = LPM_SLEEP;
/* Idle Mode 1 */
SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
PM->SLEEP.reg = SYSTEM_SLEEPMODE_IDLE_1;
start_lpm();
break;
case LPM_POWERDOWN: /* Sleep mode Idle 2 */
/* Idle Mode 2 */
current_mode = LPM_POWERDOWN;
SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
PM->SLEEP.reg = SYSTEM_SLEEPMODE_IDLE_2;
start_lpm();
break;
case LPM_OFF: /* Standby Mode - Potential Wake Up sources: Asynchronous */
current_mode = LPM_OFF;
/* Standby Mode */
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
start_lpm();
break;
default:
break;
}
return last_mode;
}
static void start_lpm(void)
{
/* Executes a device DSB (Data Synchronization Barrier) */
__DSB();
/* Enter standby mode */
__WFI();
}
enum lpm_mode lpm_arch_get(void)
{
return current_mode;
}
void lpm_arch_awake(void)
{
if (current_mode == LPM_SLEEP) {
/* Re-init */
cpu_init();
}
current_mode = LPM_ON;
}
/** Not needed */
void lpm_arch_begin_awake(void){ }
/** Not needed */
void lpm_arch_end_awake(void){ }