1 /*
2 * Copyright 2008-2012 Freescale Semiconductor Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution.
11 * * Neither the name of Freescale Semiconductor nor the
12 * names of its contributors may be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 *
16 * ALTERNATIVELY, this software may be distributed under the terms of the
17 * GNU General Public License ("GPL") as published by the Free Software
18 * Foundation, either version 2 of that License or (at your option) any
19 * later version.
20 *
21 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
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30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33
34 /**************************************************************************//**
35
36 @File endian_ext.h
37
38 @Description Big/little endian swapping routines.
39 *//***************************************************************************/
40
41 #ifndef __ENDIAN_EXT_H
42 #define __ENDIAN_EXT_H
43
44 #include "std_ext.h"
45
46
47 /**************************************************************************//**
48 @Group gen_id General Drivers Utilities
49
50 @Description General usage API. This API is intended for usage by both the
51 internal modules and the user's application.
52
53 @{
54 *//***************************************************************************/
55
56 /**************************************************************************//**
57 @Group endian_id Big/Little-Endian Conversion
58
59 @Description Routines and macros for Big/Little-Endian conversion and
60 general byte swapping.
61
62 All routines and macros are expecting unsigned values as
63 parameters, but will generate the correct result also for
64 signed values. Therefore, signed/unsigned casting is allowed.
65 @{
66 *//***************************************************************************/
67
68 /**************************************************************************//**
69 @Collection Byte-Swap Macros
70
71 Macros for swapping byte order.
72
73 @Cautions The parameters of these macros are evaluated multiple times.
74 For calculated expressions or expressions that contain function
75 calls it is recommended to use the byte-swap routines.
76
77 @{
78 *//***************************************************************************/
79
80 /**************************************************************************//**
81 @Description Swaps the byte order of a given 16-bit value.
82
83 @Param[in] val - The 16-bit value to swap.
84
85 @Return The byte-swapped value..
86
87 @Cautions The given value is evaluated multiple times by this macro.
88 For calculated expressions or expressions that contain function
89 calls it is recommended to use the SwapUint16() routine.
90
91 @hideinitializer
92 *//***************************************************************************/
93 #define SWAP_UINT16(val) \
94 ((uint16_t)((((val) & 0x00FF) << 8) | (((val) & 0xFF00) >> 8)))
95
96 /**************************************************************************//**
97 @Description Swaps the byte order of a given 32-bit value.
98
99 @Param[in] val - The 32-bit value to swap.
100
101 @Return The byte-swapped value..
102
103 @Cautions The given value is evaluated multiple times by this macro.
104 For calculated expressions or expressions that contain function
105 calls it is recommended to use the SwapUint32() routine.
106
107 @hideinitializer
108 *//***************************************************************************/
109 #define SWAP_UINT32(val) \
110 ((uint32_t)((((val) & 0x000000FF) << 24) | \
111 (((val) & 0x0000FF00) << 8) | \
112 (((val) & 0x00FF0000) >> 8) | \
113 (((val) & 0xFF000000) >> 24)))
114
115 /**************************************************************************//**
116 @Description Swaps the byte order of a given 64-bit value.
117
118 @Param[in] val - The 64-bit value to swap.
119
120 @Return The byte-swapped value..
121
122 @Cautions The given value is evaluated multiple times by this macro.
123 For calculated expressions or expressions that contain function
124 calls it is recommended to use the SwapUint64() routine.
125
126 @hideinitializer
127 *//***************************************************************************/
128 #define SWAP_UINT64(val) \
129 ((uint64_t)((((val) & 0x00000000000000FFULL) << 56) | \
130 (((val) & 0x000000000000FF00ULL) << 40) | \
131 (((val) & 0x0000000000FF0000ULL) << 24) | \
132 (((val) & 0x00000000FF000000ULL) << 8) | \
133 (((val) & 0x000000FF00000000ULL) >> 8) | \
134 (((val) & 0x0000FF0000000000ULL) >> 24) | \
135 (((val) & 0x00FF000000000000ULL) >> 40) | \
136 (((val) & 0xFF00000000000000ULL) >> 56)))
137
138 /* @} */
139
140 /**************************************************************************//**
141 @Collection Byte-Swap Routines
142
143 Routines for swapping the byte order of a given parameter and
144 returning the swapped value.
145
146 These inline routines are safer than the byte-swap macros,
147 because they evaluate the parameter expression only once.
148 @{
149 *//***************************************************************************/
150
151 /**************************************************************************//**
152 @Function SwapUint16
153
154 @Description Returns the byte-swapped value of a given 16-bit value.
155
156 @Param[in] val - The 16-bit value.
157
158 @Return The byte-swapped value of the parameter.
159 *//***************************************************************************/
SwapUint16(uint16_t val)160 static __inline__ uint16_t SwapUint16(uint16_t val)
161 {
162 return (uint16_t)(((val & 0x00FF) << 8) |
163 ((val & 0xFF00) >> 8));
164 }
165
166 /**************************************************************************//**
167 @Function SwapUint32
168
169 @Description Returns the byte-swapped value of a given 32-bit value.
170
171 @Param[in] val - The 32-bit value.
172
173 @Return The byte-swapped value of the parameter.
174 *//***************************************************************************/
SwapUint32(uint32_t val)175 static __inline__ uint32_t SwapUint32(uint32_t val)
176 {
177 return (uint32_t)(((val & 0x000000FF) << 24) |
178 ((val & 0x0000FF00) << 8) |
179 ((val & 0x00FF0000) >> 8) |
180 ((val & 0xFF000000) >> 24));
181 }
182
183 /**************************************************************************//**
184 @Function SwapUint64
185
186 @Description Returns the byte-swapped value of a given 64-bit value.
187
188 @Param[in] val - The 64-bit value.
189
190 @Return The byte-swapped value of the parameter.
191 *//***************************************************************************/
SwapUint64(uint64_t val)192 static __inline__ uint64_t SwapUint64(uint64_t val)
193 {
194 return (uint64_t)(((val & 0x00000000000000FFULL) << 56) |
195 ((val & 0x000000000000FF00ULL) << 40) |
196 ((val & 0x0000000000FF0000ULL) << 24) |
197 ((val & 0x00000000FF000000ULL) << 8) |
198 ((val & 0x000000FF00000000ULL) >> 8) |
199 ((val & 0x0000FF0000000000ULL) >> 24) |
200 ((val & 0x00FF000000000000ULL) >> 40) |
201 ((val & 0xFF00000000000000ULL) >> 56));
202 }
203
204 /* @} */
205
206 /**************************************************************************//**
207 @Collection In-place Byte-Swap-And-Set Routines
208
209 Routines for swapping the byte order of a given variable and
210 setting the swapped value back to the same variable.
211 @{
212 *//***************************************************************************/
213
214 /**************************************************************************//**
215 @Function SwapUint16P
216
217 @Description Swaps the byte order of a given 16-bit variable.
218
219 @Param[in] p_Val - Pointer to the 16-bit variable.
220
221 @Return None.
222 *//***************************************************************************/
SwapUint16P(uint16_t * p_Val)223 static __inline__ void SwapUint16P(uint16_t *p_Val)
224 {
225 *p_Val = SwapUint16(*p_Val);
226 }
227
228 /**************************************************************************//**
229 @Function SwapUint32P
230
231 @Description Swaps the byte order of a given 32-bit variable.
232
233 @Param[in] p_Val - Pointer to the 32-bit variable.
234
235 @Return None.
236 *//***************************************************************************/
SwapUint32P(uint32_t * p_Val)237 static __inline__ void SwapUint32P(uint32_t *p_Val)
238 {
239 *p_Val = SwapUint32(*p_Val);
240 }
241
242 /**************************************************************************//**
243 @Function SwapUint64P
244
245 @Description Swaps the byte order of a given 64-bit variable.
246
247 @Param[in] p_Val - Pointer to the 64-bit variable.
248
249 @Return None.
250 *//***************************************************************************/
SwapUint64P(uint64_t * p_Val)251 static __inline__ void SwapUint64P(uint64_t *p_Val)
252 {
253 *p_Val = SwapUint64(*p_Val);
254 }
255
256 /* @} */
257
258
259 /**************************************************************************//**
260 @Collection Little-Endian Conversion Macros
261
262 These macros convert given parameters to or from Little-Endian
263 format. Use these macros when you want to read or write a specific
264 Little-Endian value in memory, without a-priori knowing the CPU
265 byte order.
266
267 These macros use the byte-swap routines. For conversion of
268 constants in initialization structures, you may use the CONST
269 versions of these macros (see below), which are using the
270 byte-swap macros instead.
271 @{
272 *//***************************************************************************/
273
274 /**************************************************************************//**
275 @Description Converts a given 16-bit value from CPU byte order to
276 Little-Endian byte order.
277
278 @Param[in] val - The 16-bit value to convert.
279
280 @Return The converted value.
281
282 @hideinitializer
283 *//***************************************************************************/
284 #define CPU_TO_LE16(val) SwapUint16(val)
285
286 /**************************************************************************//**
287 @Description Converts a given 32-bit value from CPU byte order to
288 Little-Endian byte order.
289
290 @Param[in] val - The 32-bit value to convert.
291
292 @Return The converted value.
293
294 @hideinitializer
295 *//***************************************************************************/
296 #define CPU_TO_LE32(val) SwapUint32(val)
297
298 /**************************************************************************//**
299 @Description Converts a given 64-bit value from CPU byte order to
300 Little-Endian byte order.
301
302 @Param[in] val - The 64-bit value to convert.
303
304 @Return The converted value.
305
306 @hideinitializer
307 *//***************************************************************************/
308 #define CPU_TO_LE64(val) SwapUint64(val)
309
310
311 /**************************************************************************//**
312 @Description Converts a given 16-bit value from Little-Endian byte order to
313 CPU byte order.
314
315 @Param[in] val - The 16-bit value to convert.
316
317 @Return The converted value.
318
319 @hideinitializer
320 *//***************************************************************************/
321 #define LE16_TO_CPU(val) CPU_TO_LE16(val)
322
323 /**************************************************************************//**
324 @Description Converts a given 32-bit value from Little-Endian byte order to
325 CPU byte order.
326
327 @Param[in] val - The 32-bit value to convert.
328
329 @Return The converted value.
330
331 @hideinitializer
332 *//***************************************************************************/
333 #define LE32_TO_CPU(val) CPU_TO_LE32(val)
334
335 /**************************************************************************//**
336 @Description Converts a given 64-bit value from Little-Endian byte order to
337 CPU byte order.
338
339 @Param[in] val - The 64-bit value to convert.
340
341 @Return The converted value.
342
343 @hideinitializer
344 *//***************************************************************************/
345 #define LE64_TO_CPU(val) CPU_TO_LE64(val)
346
347 /* @} */
348
349 /**************************************************************************//**
350 @Collection Little-Endian Constant Conversion Macros
351
352 These macros convert given constants to or from Little-Endian
353 format. Use these macros when you want to read or write a specific
354 Little-Endian constant in memory, without a-priori knowing the
355 CPU byte order.
356
357 These macros use the byte-swap macros, therefore can be used for
358 conversion of constants in initialization structures.
359
360 @Cautions The parameters of these macros are evaluated multiple times.
361 For non-constant expressions, use the non-CONST macro versions.
362
363 @{
364 *//***************************************************************************/
365
366 /**************************************************************************//**
367 @Description Converts a given 16-bit constant from CPU byte order to
368 Little-Endian byte order.
369
370 @Param[in] val - The 16-bit value to convert.
371
372 @Return The converted value.
373
374 @hideinitializer
375 *//***************************************************************************/
376 #define CONST_CPU_TO_LE16(val) SWAP_UINT16(val)
377
378 /**************************************************************************//**
379 @Description Converts a given 32-bit constant from CPU byte order to
380 Little-Endian byte order.
381
382 @Param[in] val - The 32-bit value to convert.
383
384 @Return The converted value.
385
386 @hideinitializer
387 *//***************************************************************************/
388 #define CONST_CPU_TO_LE32(val) SWAP_UINT32(val)
389
390 /**************************************************************************//**
391 @Description Converts a given 64-bit constant from CPU byte order to
392 Little-Endian byte order.
393
394 @Param[in] val - The 64-bit value to convert.
395
396 @Return The converted value.
397
398 @hideinitializer
399 *//***************************************************************************/
400 #define CONST_CPU_TO_LE64(val) SWAP_UINT64(val)
401
402
403 /**************************************************************************//**
404 @Description Converts a given 16-bit constant from Little-Endian byte order
405 to CPU byte order.
406
407 @Param[in] val - The 16-bit value to convert.
408
409 @Return The converted value.
410
411 @hideinitializer
412 *//***************************************************************************/
413 #define CONST_LE16_TO_CPU(val) CONST_CPU_TO_LE16(val)
414
415 /**************************************************************************//**
416 @Description Converts a given 32-bit constant from Little-Endian byte order
417 to CPU byte order.
418
419 @Param[in] val - The 32-bit value to convert.
420
421 @Return The converted value.
422
423 @hideinitializer
424 *//***************************************************************************/
425 #define CONST_LE32_TO_CPU(val) CONST_CPU_TO_LE32(val)
426
427 /**************************************************************************//**
428 @Description Converts a given 64-bit constant from Little-Endian byte order
429 to CPU byte order.
430
431 @Param[in] val - The 64-bit value to convert.
432
433 @Return The converted value.
434
435 @hideinitializer
436 *//***************************************************************************/
437 #define CONST_LE64_TO_CPU(val) CONST_CPU_TO_LE64(val)
438
439 /* @} */
440
441
442 /** @} */ /* end of endian_id group */
443 /** @} */ /* end of gen_id group */
444
445
446 #endif /* __ENDIAN_EXT_H */
447
448