| /**************************************************************************//** | |
| * @file em_int.c | |
| * @brief Interrupt enable/disable unit API | |
| * @version 4.2.1 | |
| ****************************************************************************** | |
| * @section License | |
| * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.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: Silicon Labs has no | |
| * obligation to support this Software. Silicon Labs 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. | |
| * | |
| * Silicon Labs 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. | |
| * | |
| ******************************************************************************/ | |
| #include <stdint.h> | |
| #include "em_int.h" | |
| /***************************************************************************//** | |
| * @addtogroup EM_Library | |
| * @{ | |
| ******************************************************************************/ | |
| /***************************************************************************//** | |
| * @addtogroup INT | |
| * @brief Safe nesting of interrupt disable/enable API | |
| * @{ | |
| * @details | |
| * This module contains functions to safely disable and enable interrupts | |
| * at CPU level. INT_Disable() disables interrupts globally and increments a lock | |
| * level counter (counting semaphore). INT_Enable() decrements the lock level | |
| * counter and enable interrupts if the counter reaches zero. | |
| * | |
| * These functions would normally be used to secure critical regions, and | |
| * to make sure that a critical section that calls into another critical | |
| * section does not unintentionally terminate the callee critical section. | |
| * | |
| * These functions should also be used inside interrupt handlers: | |
| * @verbatim | |
| * void SysTick_Handler(void) | |
| * { | |
| * INT_Disable(); | |
| * . | |
| * . | |
| * . | |
| * INT_Enable(); | |
| * } | |
| * @endverbatim | |
| ******************************************************************************/ | |
| /** Interrupt lock level counter. Set to zero initially as we normally enter | |
| * main with interrupts enabled */ | |
| uint32_t INT_LockCnt = 0; | |
| /** @} (end addtogroup INT) */ | |
| /** @} (end addtogroup EM_Library) */ |