1 /***************************************************************************//**
2  * @file
3  * @brief EFM32 general purpose utilities.
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_COMMON_H
34 #define __EM_COMMON_H
35 
36 #include <stdint.h>
37 #include <stdbool.h>
38 
39 
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43 
44 /***************************************************************************//**
45  * @addtogroup EM_Library
46  * @{
47  ******************************************************************************/
48 
49 /***************************************************************************//**
50  * @addtogroup COMMON
51  * @brief EFM32 general purpose utilities.
52  * @{
53  ******************************************************************************/
54 
55 #if !defined(__GNUC__)
56 
57 /** Macro for getting minimum value. */
58 #define EFM32_MIN(a, b)    ((a) < (b) ? (a) : (b))
59 /** Macro for getting maximum value. */
60 #define EFM32_MAX(a, b)    ((a) > (b) ? (a) : (b))
61 
62 /** Macros for handling packed structs. */
63 #define STRINGIZE(X) #X
64 #define EFM32_PACK_START(X) _Pragma( STRINGIZE( pack( ##X## ) ) )
65 #define EFM32_PACK_END()    _Pragma( "pack()" )
66 #define __attribute__(...)
67 
68 /** Macros for handling aligned structs. */
69 #ifdef __CC_ARM
70 #define EFM32_ALIGN(X) __align(X)
71 #endif
72 #ifdef __ICCARM__
73 #define EFM32_ALIGN(X) _Pragma( STRINGIZE( data_alignment=##X## ) )
74 #endif
75 
76 #else
77 
78 /** Macro for getting minimum value. No sideeffects, a and b are evaluated once only. */
79 #define EFM32_MIN(a, b)    ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a < _b ? _a : _b; })
80 /** Macro for getting maximum value. No sideeffects, a and b are evaluated once only. */
81 #define EFM32_MAX(a, b)    ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a > _b ? _a : _b; })
82 
83 /** Macro for handling packed structs.
84  *  @n Use this macro before the struct definition.
85  *  @n X denotes the maximum alignment of struct members. X is not supported on
86  *  gcc, gcc always use 1 byte maximum alignment.
87  */
88 #define EFM32_PACK_START( x )
89 
90 /** Macro for handling packed structs.
91  *  @n Use this macro after the struct definition.
92  *  @n On gcc add __attribute__ ((packed)) after the closing } of the struct
93  *  definition.
94  */
95 #define EFM32_PACK_END()
96 
97 /** Macro for aligning a variable.
98  *  @n Use this macro before the variable definition.
99  *  @n X denotes the storage alignment value in bytes.
100  *  @n On gcc use __attribute__ ((aligned(X))) before the ; on normal variables.
101  *  Use __attribute__ ((aligned(X))) before the opening { on struct variables.
102  */
103 #define EFM32_ALIGN(X)
104 
105 #endif
106 
107 /** @} (end addtogroup COMMON) */
108 /** @} (end addtogroup EM_Library) */
109 
110 #ifdef __cplusplus
111 }
112 #endif
113 
114 #endif /* __EM_COMMON_H */
115