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74 lines
3.0 KiB
C
74 lines
3.0 KiB
C
/**************************************************************************//**
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* @file em_int.c
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* @brief Interrupt enable/disable unit API
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* @version 4.3.0
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******************************************************************************
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* @section License
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* <b>Copyright 2016 Silicon Laboratories, Inc. http://www.silabs.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: Silicon Labs has no
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* obligation to support this Software. Silicon Labs 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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* Silicon Labs 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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#include <stdint.h>
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#include "em_int.h"
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/***************************************************************************//**
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* @addtogroup emlib
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup INT
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* @brief Safe nesting of interrupt disable/enable API
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* @{
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* @details
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* This module contains functions to safely disable and enable interrupts
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* at CPU level. INT_Disable() disables interrupts globally and increments a lock
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* level counter (counting semaphore). INT_Enable() decrements the lock level
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* counter and enable interrupts if the counter reaches zero.
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*
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* These functions would normally be used to secure critical regions, and
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* to make sure that a critical section that calls into another critical
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* section does not unintentionally terminate the callee critical section.
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*
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* These functions should also be used inside interrupt handlers:
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* @verbatim
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* void SysTick_Handler(void)
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* {
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* INT_Disable();
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* .
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* .
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* .
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* INT_Enable();
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* }
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* @endverbatim
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******************************************************************************/
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/** Interrupt lock level counter. Set to zero initially as we normally enter
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* main with interrupts enabled */
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uint32_t INT_LockCnt = 0;
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/** @} (end addtogroup INT) */
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/** @} (end addtogroup emlib) */
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