Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_int.c

Revision:

0:9b334a45a8ff

Child:

50:a417edff4437

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_int.c	Thu Oct 01 15:25:22 2015 +0300
@@ -0,0 +1,73 @@
+/**************************************************************************//**
+ * @file em_int.c
+ * @brief Interrupt enable/disable unit API
+ * @version 3.20.12
+ ******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2014 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 interrupt disable/enable API
+ * @{
+ * @details
+ *  This module contains functions to safely disable and enable interrupts
+ *  at cpu level. INT_Disable() disables interrupts and increments a lock
+ *  level counter. INT_Enable() decrements the lock level counter and enable
+ *  interrupts if the counter was decremented to zero.
+ *
+ *  These functions would normally be used to secure critical regions.
+ *
+ *  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) */