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