2013-01-08 22:40:58 +08:00
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/***************************************************************************//**
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* @file
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* @brief Interrupt enable/disable unit API
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* @author Energy Micro AS
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* @version 3.0.0
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#ifndef __EM_INT_H
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#define __EM_INT_H
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#include "em_part.h"
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extern uint32_t INT_LockCnt;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***************************************************************************//**
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* @addtogroup EM_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup INT
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @brief
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* Disable interrupts.
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*
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* @return
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* The resulting interrupt nesting level.
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*
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* @details
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* Disable interrupts and increment lock level counter.
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*
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******************************************************************************/
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__STATIC_INLINE uint32_t INT_Disable(void)
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{
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__disable_irq();
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if (INT_LockCnt < UINT32_MAX)
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{
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INT_LockCnt++;
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}
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return INT_LockCnt;
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}
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/***************************************************************************//**
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* @brief
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* Enable interrupts.
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*
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* @return
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* The resulting interrupt nesting level.
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*
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* @details
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* Decrement interrupt lock level counter and enable interrupts if counter
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* reached zero.
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*
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******************************************************************************/
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__STATIC_INLINE uint32_t INT_Enable(void)
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{
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uint32_t retVal;
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if (INT_LockCnt > 0)
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{
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INT_LockCnt--;
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retVal = INT_LockCnt;
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if (retVal == 0)
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{
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__enable_irq();
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}
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return retVal;
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}
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else
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{
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return 0;
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}
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}
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/** @} (end addtogroup INT) */
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/** @} (end addtogroup EM_Library) */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __EM_INT_H */
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