Michele Riccio
mbed-os 6.10 versione
Diff: cmsis_dsp/FastMathFunctions/arm_sin_q15.c
- Revision:
- 3:7a284390b0ce
- Parent:
- 2:da51fb522205
--- a/cmsis_dsp/FastMathFunctions/arm_sin_q15.c Thu May 30 17:10:11 2013 +0100
+++ b/cmsis_dsp/FastMathFunctions/arm_sin_q15.c Fri Nov 08 13:45:10 2013 +0000
@@ -1,8 +1,8 @@
/* ----------------------------------------------------------------------
-* Copyright (C) 2010 ARM Limited. All rights reserved.
+* Copyright (C) 2010-2013 ARM Limited. All rights reserved.
*
-* $Date: 15. February 2012
-* $Revision: V1.1.0
+* $Date: 17. January 2013
+* $Revision: V1.4.1
*
* Project: CMSIS DSP Library
* Title: arm_sin_q15.c
@@ -11,23 +11,31 @@
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
-* Version 1.1.0 2012/02/15
-* Updated with more optimizations, bug fixes and minor API changes.
-*
-* Version 1.0.10 2011/7/15
-* Big Endian support added and Merged M0 and M3/M4 Source code.
-*
-* Version 1.0.3 2010/11/29
-* Re-organized the CMSIS folders and updated documentation.
-*
-* Version 1.0.2 2010/11/11
-* Documentation updated.
-*
-* Version 1.0.1 2010/10/05
-* Production release and review comments incorporated.
-*
-* Version 1.0.0 2010/09/20
-* Production release and review comments incorporated.
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+* - Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+* - Redistributions in binary form must reproduce the above copyright
+* notice, this list of conditions and the following disclaimer in
+* the documentation and/or other materials provided with the
+* distribution.
+* - Neither the name of ARM LIMITED nor the names of its contributors
+* may be used to endorse or promote products derived from this
+* software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.
* -------------------------------------------------------------------- */
#include "arm_math.h"
@@ -42,24 +50,24 @@
*/
-/**
- * \par
- * Example code for Generation of Q15 Sin Table:
- * \par
- * <pre>tableSize = 256;
+/**
+* \par
+ * Table values are in Q15 (1.15 fixed-point format) and generation is done in
+ * three steps. First, generate sin values in floating point:
+ * <pre>
+ * tableSize = 256;
* for(n = -1; n < (tableSize + 1); n++)
* {
- * sinTable[n+1]=sin(2*pi*n/tableSize);
- * } </pre>
+ * sinTable[n+1]= sin(2*pi*n/tableSize);
+ * } </pre>
* where pi value is 3.14159265358979
* \par
- * Convert Floating point to Q15(Fixed point):
+ * Second, convert floating-point to Q15 (fixed-point):
* (sinTable[i] * pow(2, 15))
* \par
- * rounding to nearest integer is done
+ * Finally, round to the nearest integer value:
* sinTable[i] += (sinTable[i] > 0 ? 0.5 :-0.5);
- */
-
+*/
static const q15_t sinTableQ15[259] = {
0xfcdc, 0x0, 0x324, 0x648, 0x96b, 0xc8c, 0xfab, 0x12c8,
@@ -103,7 +111,7 @@
* @param[in] x Scaled input value in radians.
* @return sin(x).
*
- * The Q15 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi), Here range excludes 2*pi.
+ * The Q15 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi).
*/
q15_t arm_sin_q15(