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+/****************************************************************************
+ * configs/mikroe_stm32f4/src/stm32_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 <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+#include <nuttx/clock.h>
+#include <nuttx/power/pm.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() board_led_on(LED_IDLE)
+# define END_IDLE() board_led_off(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
+}
+
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