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/***************************************************************************//**
* @file
* @brief Interrupt enable/disable unit API
* @author Energy Micro AS
* @version 3.0.0
*******************************************************************************
* @section License
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
*******************************************************************************
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* 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 __EM_INT_H
#define __EM_INT_H
#include "em_part.h"
extern uint32_t INT_LockCnt;
#ifdef __cplusplus
extern "C" {
#endif
/***************************************************************************//**
* @addtogroup EM_Library
* @{
******************************************************************************/
/***************************************************************************//**
* @addtogroup INT
* @{
******************************************************************************/
/***************************************************************************//**
* @brief
* Disable interrupts.
*
* @return
* The resulting interrupt nesting level.
*
* @details
* Disable interrupts and increment lock level counter.
*
******************************************************************************/
__STATIC_INLINE uint32_t INT_Disable(void)
{
__disable_irq();
if (INT_LockCnt < UINT32_MAX)
{
INT_LockCnt++;
}
return INT_LockCnt;
}
/***************************************************************************//**
* @brief
* Enable interrupts.
*
* @return
* The resulting interrupt nesting level.
*
* @details
* Decrement interrupt lock level counter and enable interrupts if counter
* reached zero.
*
******************************************************************************/
__STATIC_INLINE uint32_t INT_Enable(void)
{
uint32_t retVal;
if (INT_LockCnt > 0)
{
INT_LockCnt--;
retVal = INT_LockCnt;
if (retVal == 0)
{
__enable_irq();
}
return retVal;
}
else
{
return 0;
}
}
/** @} (end addtogroup INT) */
/** @} (end addtogroup EM_Library) */
#ifdef __cplusplus
}
#endif
#endif /* __EM_INT_H */
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