1 /***************************************************************************//**
2 * @file
3 * @brief Interrupt enable/disable unit API
4 * @author Energy Micro AS
5 * @version 3.0.0
6 *******************************************************************************
7 * @section License
8 * <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
9 *******************************************************************************
10 *
11 * Permission is granted to anyone to use this software for any purpose,
12 * including commercial applications, and to alter it and redistribute it
13 * freely, subject to the following restrictions:
14 *
15 * 1. The origin of this software must not be misrepresented; you must not
16 * claim that you wrote the original software.
17 * 2. Altered source versions must be plainly marked as such, and must not be
18 * misrepresented as being the original software.
19 * 3. This notice may not be removed or altered from any source distribution.
20 *
21 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
22 * obligation to support this Software. Energy Micro AS is providing the
23 * Software "AS IS", with no express or implied warranties of any kind,
24 * including, but not limited to, any implied warranties of merchantability
25 * or fitness for any particular purpose or warranties against infringement
26 * of any proprietary rights of a third party.
27 *
28 * Energy Micro AS will not be liable for any consequential, incidental, or
29 * special damages, or any other relief, or for any claim by any third party,
30 * arising from your use of this Software.
31 *
32 ******************************************************************************/
33 #ifndef __EM_INT_H
34 #define __EM_INT_H
35
36 #include "em_part.h"
37
38 extern uint32_t INT_LockCnt;
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /***************************************************************************//**
45 * @addtogroup EM_Library
46 * @{
47 ******************************************************************************/
48
49 /***************************************************************************//**
50 * @addtogroup INT
51 * @{
52 ******************************************************************************/
53
54 /***************************************************************************//**
55 * @brief
56 * Disable interrupts.
57 *
58 * @return
59 * The resulting interrupt nesting level.
60 *
61 * @details
62 * Disable interrupts and increment lock level counter.
63 *
64 ******************************************************************************/
INT_Disable(void)65 __STATIC_INLINE uint32_t INT_Disable(void)
66 {
67 __disable_irq();
68 if (INT_LockCnt < UINT32_MAX)
69 {
70 INT_LockCnt++;
71 }
72
73 return INT_LockCnt;
74 }
75
76 /***************************************************************************//**
77 * @brief
78 * Enable interrupts.
79 *
80 * @return
81 * The resulting interrupt nesting level.
82 *
83 * @details
84 * Decrement interrupt lock level counter and enable interrupts if counter
85 * reached zero.
86 *
87 ******************************************************************************/
INT_Enable(void)88 __STATIC_INLINE uint32_t INT_Enable(void)
89 {
90 uint32_t retVal;
91
92 if (INT_LockCnt > 0)
93 {
94 INT_LockCnt--;
95 retVal = INT_LockCnt;
96 if (retVal == 0)
97 {
98 __enable_irq();
99 }
100 return retVal;
101 }
102 else
103 {
104 return 0;
105 }
106 }
107
108 /** @} (end addtogroup INT) */
109 /** @} (end addtogroup EM_Library) */
110
111 #ifdef __cplusplus
112 }
113 #endif
114
115 #endif /* __EM_INT_H */
116