Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

SupportFunctions/arm_float_to_q31.c@0:3d9c67d97d6f, 2014-07-28 (annotated)

Committer:
emh203
Date:
Mon Jul 28 15:03:15 2014 +0000
Revision:
0:3d9c67d97d6f
1st working commit.   Had to remove arm_bitreversal2.s     arm_cfft_f32.c and arm_rfft_fast_f32.c.    The .s will not assemble.      For now I removed these functions so we could at least have a library for the other functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emh203 0:3d9c67d97d6f 1 /* ----------------------------------------------------------------------------
emh203 0:3d9c67d97d6f 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emh203 0:3d9c67d97d6f 3 *
emh203 0:3d9c67d97d6f 4 * $Date: 12. March 2014
emh203 0:3d9c67d97d6f 5 * $Revision: V1.4.3
emh203 0:3d9c67d97d6f 6 *
emh203 0:3d9c67d97d6f 7 * Project: CMSIS DSP Library
emh203 0:3d9c67d97d6f 8 * Title: arm_float_to_q31.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Converts the elements of the floating-point vector to Q31 vector.
emh203 0:3d9c67d97d6f 11 *
emh203 0:3d9c67d97d6f 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emh203 0:3d9c67d97d6f 13 *
emh203 0:3d9c67d97d6f 14 * Redistribution and use in source and binary forms, with or without
emh203 0:3d9c67d97d6f 15 * modification, are permitted provided that the following conditions
emh203 0:3d9c67d97d6f 16 * are met:
emh203 0:3d9c67d97d6f 17 * - Redistributions of source code must retain the above copyright
emh203 0:3d9c67d97d6f 18 * notice, this list of conditions and the following disclaimer.
emh203 0:3d9c67d97d6f 19 * - Redistributions in binary form must reproduce the above copyright
emh203 0:3d9c67d97d6f 20 * notice, this list of conditions and the following disclaimer in
emh203 0:3d9c67d97d6f 21 * the documentation and/or other materials provided with the
emh203 0:3d9c67d97d6f 22 * distribution.
emh203 0:3d9c67d97d6f 23 * - Neither the name of ARM LIMITED nor the names of its contributors
emh203 0:3d9c67d97d6f 24 * may be used to endorse or promote products derived from this
emh203 0:3d9c67d97d6f 25 * software without specific prior written permission.
emh203 0:3d9c67d97d6f 26 *
emh203 0:3d9c67d97d6f 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
emh203 0:3d9c67d97d6f 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
emh203 0:3d9c67d97d6f 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
emh203 0:3d9c67d97d6f 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
emh203 0:3d9c67d97d6f 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
emh203 0:3d9c67d97d6f 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
emh203 0:3d9c67d97d6f 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
emh203 0:3d9c67d97d6f 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
emh203 0:3d9c67d97d6f 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
emh203 0:3d9c67d97d6f 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
emh203 0:3d9c67d97d6f 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emh203 0:3d9c67d97d6f 38 * POSSIBILITY OF SUCH DAMAGE.
emh203 0:3d9c67d97d6f 39 * ---------------------------------------------------------------------------- */
emh203 0:3d9c67d97d6f 40
emh203 0:3d9c67d97d6f 41 #include "arm_math.h"
emh203 0:3d9c67d97d6f 42
emh203 0:3d9c67d97d6f 43 /**
emh203 0:3d9c67d97d6f 44 * @ingroup groupSupport
emh203 0:3d9c67d97d6f 45 */
emh203 0:3d9c67d97d6f 46
emh203 0:3d9c67d97d6f 47 /**
emh203 0:3d9c67d97d6f 48 * @defgroup float_to_x Convert 32-bit floating point value
emh203 0:3d9c67d97d6f 49 */
emh203 0:3d9c67d97d6f 50
emh203 0:3d9c67d97d6f 51 /**
emh203 0:3d9c67d97d6f 52 * @addtogroup float_to_x
emh203 0:3d9c67d97d6f 53 * @{
emh203 0:3d9c67d97d6f 54 */
emh203 0:3d9c67d97d6f 55
emh203 0:3d9c67d97d6f 56 /**
emh203 0:3d9c67d97d6f 57 * @brief Converts the elements of the floating-point vector to Q31 vector.
emh203 0:3d9c67d97d6f 58 * @param[in] *pSrc points to the floating-point input vector
emh203 0:3d9c67d97d6f 59 * @param[out] *pDst points to the Q31 output vector
emh203 0:3d9c67d97d6f 60 * @param[in] blockSize length of the input vector
emh203 0:3d9c67d97d6f 61 * @return none.
emh203 0:3d9c67d97d6f 62 *
emh203 0:3d9c67d97d6f 63 *\par Description:
emh203 0:3d9c67d97d6f 64 * \par
emh203 0:3d9c67d97d6f 65 * The equation used for the conversion process is:
emh203 0:3d9c67d97d6f 66 *
emh203 0:3d9c67d97d6f 67 * <pre>
emh203 0:3d9c67d97d6f 68 * pDst[n] = (q31_t)(pSrc[n] * 2147483648); 0 <= n < blockSize.
emh203 0:3d9c67d97d6f 69 * </pre>
emh203 0:3d9c67d97d6f 70 * <b>Scaling and Overflow Behavior:</b>
emh203 0:3d9c67d97d6f 71 * \par
emh203 0:3d9c67d97d6f 72 * The function uses saturating arithmetic.
emh203 0:3d9c67d97d6f 73 * Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.
emh203 0:3d9c67d97d6f 74 *
emh203 0:3d9c67d97d6f 75 * \note In order to apply rounding, the library should be rebuilt with the ROUNDING macro
emh203 0:3d9c67d97d6f 76 * defined in the preprocessor section of project options.
emh203 0:3d9c67d97d6f 77 */
emh203 0:3d9c67d97d6f 78
emh203 0:3d9c67d97d6f 79
emh203 0:3d9c67d97d6f 80 void arm_float_to_q31(
emh203 0:3d9c67d97d6f 81 float32_t * pSrc,
emh203 0:3d9c67d97d6f 82 q31_t * pDst,
emh203 0:3d9c67d97d6f 83 uint32_t blockSize)
emh203 0:3d9c67d97d6f 84 {
emh203 0:3d9c67d97d6f 85 float32_t *pIn = pSrc; /* Src pointer */
emh203 0:3d9c67d97d6f 86 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 87
emh203 0:3d9c67d97d6f 88 #ifdef ARM_MATH_ROUNDING
emh203 0:3d9c67d97d6f 89
emh203 0:3d9c67d97d6f 90 float32_t in;
emh203 0:3d9c67d97d6f 91
emh203 0:3d9c67d97d6f 92 #endif /* #ifdef ARM_MATH_ROUNDING */
emh203 0:3d9c67d97d6f 93
emh203 0:3d9c67d97d6f 94 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 95
emh203 0:3d9c67d97d6f 96 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 97
emh203 0:3d9c67d97d6f 98 /*loop Unrolling */
emh203 0:3d9c67d97d6f 99 blkCnt = blockSize >> 2u;
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 102 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 103 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 104 {
emh203 0:3d9c67d97d6f 105
emh203 0:3d9c67d97d6f 106 #ifdef ARM_MATH_ROUNDING
emh203 0:3d9c67d97d6f 107
emh203 0:3d9c67d97d6f 108 /* C = A * 32768 */
emh203 0:3d9c67d97d6f 109 /* convert from float to Q31 and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 110 in = *pIn++;
emh203 0:3d9c67d97d6f 111 in = (in * 2147483648.0f);
emh203 0:3d9c67d97d6f 112 in += in > 0 ? 0.5 : -0.5;
emh203 0:3d9c67d97d6f 113 *pDst++ = clip_q63_to_q31((q63_t) (in));
emh203 0:3d9c67d97d6f 114
emh203 0:3d9c67d97d6f 115 in = *pIn++;
emh203 0:3d9c67d97d6f 116 in = (in * 2147483648.0f);
emh203 0:3d9c67d97d6f 117 in += in > 0 ? 0.5 : -0.5;
emh203 0:3d9c67d97d6f 118 *pDst++ = clip_q63_to_q31((q63_t) (in));
emh203 0:3d9c67d97d6f 119
emh203 0:3d9c67d97d6f 120 in = *pIn++;
emh203 0:3d9c67d97d6f 121 in = (in * 2147483648.0f);
emh203 0:3d9c67d97d6f 122 in += in > 0 ? 0.5 : -0.5;
emh203 0:3d9c67d97d6f 123 *pDst++ = clip_q63_to_q31((q63_t) (in));
emh203 0:3d9c67d97d6f 124
emh203 0:3d9c67d97d6f 125 in = *pIn++;
emh203 0:3d9c67d97d6f 126 in = (in * 2147483648.0f);
emh203 0:3d9c67d97d6f 127 in += in > 0 ? 0.5 : -0.5;
emh203 0:3d9c67d97d6f 128 *pDst++ = clip_q63_to_q31((q63_t) (in));
emh203 0:3d9c67d97d6f 129
emh203 0:3d9c67d97d6f 130 #else
emh203 0:3d9c67d97d6f 131
emh203 0:3d9c67d97d6f 132 /* C = A * 2147483648 */
emh203 0:3d9c67d97d6f 133 /* convert from float to Q31 and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 134 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f));
emh203 0:3d9c67d97d6f 135 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f));
emh203 0:3d9c67d97d6f 136 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f));
emh203 0:3d9c67d97d6f 137 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f));
emh203 0:3d9c67d97d6f 138
emh203 0:3d9c67d97d6f 139 #endif /* #ifdef ARM_MATH_ROUNDING */
emh203 0:3d9c67d97d6f 140
emh203 0:3d9c67d97d6f 141 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 142 blkCnt--;
emh203 0:3d9c67d97d6f 143 }
emh203 0:3d9c67d97d6f 144
emh203 0:3d9c67d97d6f 145 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 146 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 147 blkCnt = blockSize % 0x4u;
emh203 0:3d9c67d97d6f 148
emh203 0:3d9c67d97d6f 149 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 150 {
emh203 0:3d9c67d97d6f 151
emh203 0:3d9c67d97d6f 152 #ifdef ARM_MATH_ROUNDING
emh203 0:3d9c67d97d6f 153
emh203 0:3d9c67d97d6f 154 /* C = A * 2147483648 */
emh203 0:3d9c67d97d6f 155 /* convert from float to Q31 and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 156 in = *pIn++;
emh203 0:3d9c67d97d6f 157 in = (in * 2147483648.0f);
emh203 0:3d9c67d97d6f 158 in += in > 0 ? 0.5 : -0.5;
emh203 0:3d9c67d97d6f 159 *pDst++ = clip_q63_to_q31((q63_t) (in));
emh203 0:3d9c67d97d6f 160
emh203 0:3d9c67d97d6f 161 #else
emh203 0:3d9c67d97d6f 162
emh203 0:3d9c67d97d6f 163 /* C = A * 2147483648 */
emh203 0:3d9c67d97d6f 164 /* convert from float to Q31 and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 165 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f));
emh203 0:3d9c67d97d6f 166
emh203 0:3d9c67d97d6f 167 #endif /* #ifdef ARM_MATH_ROUNDING */
emh203 0:3d9c67d97d6f 168
emh203 0:3d9c67d97d6f 169 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 170 blkCnt--;
emh203 0:3d9c67d97d6f 171 }
emh203 0:3d9c67d97d6f 172
emh203 0:3d9c67d97d6f 173
emh203 0:3d9c67d97d6f 174 #else
emh203 0:3d9c67d97d6f 175
emh203 0:3d9c67d97d6f 176 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 177
emh203 0:3d9c67d97d6f 178 /* Loop over blockSize number of values */
emh203 0:3d9c67d97d6f 179 blkCnt = blockSize;
emh203 0:3d9c67d97d6f 180
emh203 0:3d9c67d97d6f 181 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 182 {
emh203 0:3d9c67d97d6f 183
emh203 0:3d9c67d97d6f 184 #ifdef ARM_MATH_ROUNDING
emh203 0:3d9c67d97d6f 185
emh203 0:3d9c67d97d6f 186 /* C = A * 2147483648 */
emh203 0:3d9c67d97d6f 187 /* convert from float to Q31 and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 188 in = *pIn++;
emh203 0:3d9c67d97d6f 189 in = (in * 2147483648.0f);
emh203 0:3d9c67d97d6f 190 in += in > 0 ? 0.5f : -0.5f;
emh203 0:3d9c67d97d6f 191 *pDst++ = clip_q63_to_q31((q63_t) (in));
emh203 0:3d9c67d97d6f 192
emh203 0:3d9c67d97d6f 193 #else
emh203 0:3d9c67d97d6f 194
emh203 0:3d9c67d97d6f 195 /* C = A * 2147483648 */
emh203 0:3d9c67d97d6f 196 /* convert from float to Q31 and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 197 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f));
emh203 0:3d9c67d97d6f 198
emh203 0:3d9c67d97d6f 199 #endif /* #ifdef ARM_MATH_ROUNDING */
emh203 0:3d9c67d97d6f 200
emh203 0:3d9c67d97d6f 201 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 202 blkCnt--;
emh203 0:3d9c67d97d6f 203 }
emh203 0:3d9c67d97d6f 204
emh203 0:3d9c67d97d6f 205 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 206
emh203 0:3d9c67d97d6f 207 }
emh203 0:3d9c67d97d6f 208
emh203 0:3d9c67d97d6f 209 /**
emh203 0:3d9c67d97d6f 210 * @} end of float_to_x group
emh203 0:3d9c67d97d6f 211 */