nuttx/configs/mikroe-stm32f4/src/up_idle.c

278 lines
7.6 KiB
C

/****************************************************************************
* configs/mikroe_stm32f4/src/up_idle.c
* arch/arm/src/board/up_idle.c
*
* Copyright (C) 2012-2013 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
* Diego Sanchez <dsanchez@nx-engineering.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <arch/board/board.h>
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include <nuttx/clock.h>
#include <nuttx/power/pm.h>
#include <debug.h>
#include <nuttx/rtc.h>
#include <arch/irq.h>
#include "up_internal.h"
#include "stm32_pm.h"
#include "stm32_rcc.h"
#include "stm32_exti.h"
#include "mikroe-stm32f4-internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Does the board support an IDLE LED to indicate that the board is in the
* IDLE state?
*/
#if defined(CONFIG_ARCH_LEDS) && defined(LED_IDLE)
# define BEGIN_IDLE() up_ledon(LED_IDLE)
# define END_IDLE() up_ledoff(LED_IDLE)
#else
# define BEGIN_IDLE()
# define END_IDLE()
#endif
/* Values for the RTC Alarm to wake up from the PM_STANDBY mode */
#ifndef CONFIG_PM_ALARM_SEC
# define CONFIG_PM_ALARM_SEC 3
#endif
#ifndef CONFIG_PM_ALARM_NSEC
# define CONFIG_PM_ALARM_NSEC 0
#endif
/****************************************************************************
* Private Data
****************************************************************************/
#if defined(CONFIG_PM) && defined(CONFIG_RTC_ALARM)
static void up_alarmcb(void);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_idlepm
*
* Description:
* Perform IDLE state power management.
*
****************************************************************************/
#ifdef CONFIG_PM
static void up_idlepm(void)
{
#ifdef CONFIG_RTC_ALARM
struct timespec alarmtime;
#endif
static enum pm_state_e oldstate = PM_NORMAL;
enum pm_state_e newstate;
irqstate_t flags;
int ret;
/* Decide, which power saving level can be obtained */
newstate = pm_checkstate();
/* Check for state changes */
if (newstate != oldstate)
{
lldbg("newstate= %d oldstate=%d\n", newstate, oldstate);
flags = irqsave();
/* Force the global state change */
ret = pm_changestate(newstate);
if (ret < 0)
{
/* The new state change failed, revert to the preceding state */
(void)pm_changestate(oldstate);
/* No state change... */
goto errout;
}
/* Then perform board-specific, state-dependent logic here */
switch (newstate)
{
case PM_NORMAL:
{
}
break;
case PM_IDLE:
{
}
break;
case PM_STANDBY:
{
#ifdef CONFIG_RTC_ALARM
/* Disable RTC Alarm interrupt */
#warning "missing logic"
/* Configure the RTC alarm to Auto Wake the system */
#warning "missing logic"
/* The tv_nsec value must not exceed 1,000,000,000. That
* would be an invalid time.
*/
#warning "missing logic"
/* Set the alarm */
#warning "missing logic"
#endif
/* Call the STM32 stop mode */
stm32_pmstop(true);
/* We have been re-awakened by some even: A button press?
* An alarm? Cancel any pending alarm and resume the normal
* operation.
*/
#ifdef CONFIG_RTC_ALARM
#warning "missing logic"
#endif
/* Resume normal operation */
pm_changestate(PM_NORMAL);
newstate = PM_NORMAL;
}
break;
case PM_SLEEP:
{
/* We should not return from standby mode. The only way out
* of standby is via the reset path.
*/
(void)stm32_pmstandby();
}
break;
default:
break;
}
/* Save the new state */
oldstate = newstate;
errout:
irqrestore(flags);
}
}
#else
# define up_idlepm()
#endif
/************************************************************************************
* Name: up_alarmcb
*
* Description:
* RTC alarm service routine
*
************************************************************************************/
#if defined(CONFIG_PM) && defined(CONFIG_RTC_ALARM)
static void up_alarmcb(void)
{
/* This alarm occurs because there wasn't any EXTI interrupt during the
* PM_STANDBY period. So just go to sleep.
*/
pm_changestate(PM_SLEEP);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_idle
*
* Description:
* up_idle() is the logic that will be executed when their is no other
* ready-to-run task. This is processor idle time and will continue until
* some interrupt occurs to cause a context switch from the idle task.
*
* Processing in this state may be processor-specific. e.g., this is where
* power management operations might be performed.
*
****************************************************************************/
void up_idle(void)
{
#if defined(CONFIG_SUPPRESS_INTERRUPTS) || defined(CONFIG_SUPPRESS_TIMER_INTS)
/* If the system is idle and there are no timer interrupts, then process
* "fake" timer interrupts. Hopefully, something will wake up.
*/
sched_process_timer();
#else
/* Perform IDLE mode power management */
BEGIN_IDLE();
up_idlepm();
END_IDLE();
#endif
}