rt-thread/bsp/efm32/Libraries/efm32lib/inc/efm32_emu.h

/***************************************************************************//**
 * @file
 * @brief Energy management unit (EMU) peripheral API for EFM32.
 * @author Energy Micro AS
 * @version 1.3.0
 *******************************************************************************
 * @section License
 * <b>(C) Copyright 2010 Energy Micro AS, http://www.energymicro.com</b>
 *******************************************************************************
 *
 * This source code is the property of Energy Micro AS. The source and compiled
 * code may only be used on Energy Micro "EFM32" microcontrollers.
 *
 * This copyright notice may not be removed from the source code nor changed.
 *
 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
 * obligation to support this Software. Energy Micro AS is providing the
 * Software "AS IS", with no express or implied warranties of any kind,
 * including, but not limited to, any implied warranties of merchantability
 * or fitness for any particular purpose or warranties against infringement
 * of any proprietary rights of a third party.
 *
 * Energy Micro AS will not be liable for any consequential, incidental, or
 * special damages, or any other relief, or for any claim by any third party,
 * arising from your use of this Software.
 *
 ******************************************************************************/
#ifndef __EFM32_EMU_H
#define __EFM32_EMU_H

#include <stdbool.h>
#include "efm32.h"

#ifdef __cplusplus
extern "C" {
#endif

/***************************************************************************//**
 * @addtogroup EFM32_Library
 * @{
 ******************************************************************************/

/***************************************************************************//**
 * @addtogroup EMU
 * @{
 ******************************************************************************/

/*******************************************************************************
 *****************************   PROTOTYPES   **********************************
 ******************************************************************************/

/***************************************************************************//**
 * @brief
 *   Enter energy mode 1 (EM1).
 ******************************************************************************/
static __INLINE void EMU_EnterEM1(void)
{
  /* Just enter Cortex-M3 sleep mode */
  SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
  __WFI();
}


void EMU_EnterEM2(bool restore);
void EMU_EnterEM3(bool restore);
void EMU_EnterEM4(void);

/***************************************************************************//**
 * @brief
 *   Lock the EMU in order to protect all its registers against unintended
 *   modification.
 *
 * @note
 *   If locking the EMU registers, they must be unlocked prior to using any
 *   EMU API functions modifying EMU registers. An exception to this is the
 *   energy mode entering API (EMU_EnterEMn()), which can be used when the
 *   EMU registers are locked.
 ******************************************************************************/
static __INLINE void EMU_Lock(void)
{
  EMU->LOCK = EMU_LOCK_LOCKKEY_LOCK;
}

void EMU_MemPwrDown(uint32_t blocks);

/***************************************************************************//**
 * @brief
 *   Unlock the EMU so that writing to locked registers again is possible.
 ******************************************************************************/
static __INLINE void EMU_Unlock(void)
{
  EMU->LOCK = EMU_LOCK_LOCKKEY_UNLOCK;
}

void EMU_UpdateOscConfig(void);

/** @} (end addtogroup EMU) */
/** @} (end addtogroup EFM32_Library) */

#ifdef __cplusplus
}
#endif

#endif /* __EFM32_EMU_H */