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_q31_to_float.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_q31_to_float.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Converts the elements of the Q31 vector to floating-point 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 q31_to_x Convert 32-bit Integer value
emh203 0:3d9c67d97d6f 49 */
emh203 0:3d9c67d97d6f 50
emh203 0:3d9c67d97d6f 51 /**
emh203 0:3d9c67d97d6f 52 * @addtogroup q31_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 Q31 vector to floating-point vector.
emh203 0:3d9c67d97d6f 58 * @param[in] *pSrc points to the Q31 input vector
emh203 0:3d9c67d97d6f 59 * @param[out] *pDst points to the floating-point 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 *
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] = (float32_t) pSrc[n] / 2147483648; 0 <= n < blockSize.
emh203 0:3d9c67d97d6f 69 * </pre>
emh203 0:3d9c67d97d6f 70 *
emh203 0:3d9c67d97d6f 71 */
emh203 0:3d9c67d97d6f 72
emh203 0:3d9c67d97d6f 73
emh203 0:3d9c67d97d6f 74 void arm_q31_to_float(
emh203 0:3d9c67d97d6f 75 q31_t * pSrc,
emh203 0:3d9c67d97d6f 76 float32_t * pDst,
emh203 0:3d9c67d97d6f 77 uint32_t blockSize)
emh203 0:3d9c67d97d6f 78 {
emh203 0:3d9c67d97d6f 79 q31_t *pIn = pSrc; /* Src pointer */
emh203 0:3d9c67d97d6f 80 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82
emh203 0:3d9c67d97d6f 83 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 84
emh203 0:3d9c67d97d6f 85 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 86
emh203 0:3d9c67d97d6f 87 /*loop Unrolling */
emh203 0:3d9c67d97d6f 88 blkCnt = blockSize >> 2u;
emh203 0:3d9c67d97d6f 89
emh203 0:3d9c67d97d6f 90 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 91 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 92 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 93 {
emh203 0:3d9c67d97d6f 94 /* C = (float32_t) A / 2147483648 */
emh203 0:3d9c67d97d6f 95 /* convert from q31 to float and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 96 *pDst++ = ((float32_t) * pIn++ / 2147483648.0f);
emh203 0:3d9c67d97d6f 97 *pDst++ = ((float32_t) * pIn++ / 2147483648.0f);
emh203 0:3d9c67d97d6f 98 *pDst++ = ((float32_t) * pIn++ / 2147483648.0f);
emh203 0:3d9c67d97d6f 99 *pDst++ = ((float32_t) * pIn++ / 2147483648.0f);
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 102 blkCnt--;
emh203 0:3d9c67d97d6f 103 }
emh203 0:3d9c67d97d6f 104
emh203 0:3d9c67d97d6f 105 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 106 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 107 blkCnt = blockSize % 0x4u;
emh203 0:3d9c67d97d6f 108
emh203 0:3d9c67d97d6f 109 #else
emh203 0:3d9c67d97d6f 110
emh203 0:3d9c67d97d6f 111 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 112
emh203 0:3d9c67d97d6f 113 /* Loop over blockSize number of values */
emh203 0:3d9c67d97d6f 114 blkCnt = blockSize;
emh203 0:3d9c67d97d6f 115
emh203 0:3d9c67d97d6f 116 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 117
emh203 0:3d9c67d97d6f 118 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 119 {
emh203 0:3d9c67d97d6f 120 /* C = (float32_t) A / 2147483648 */
emh203 0:3d9c67d97d6f 121 /* convert from q31 to float and then store the results in the destination buffer */
emh203 0:3d9c67d97d6f 122 *pDst++ = ((float32_t) * pIn++ / 2147483648.0f);
emh203 0:3d9c67d97d6f 123
emh203 0:3d9c67d97d6f 124 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 125 blkCnt--;
emh203 0:3d9c67d97d6f 126 }
emh203 0:3d9c67d97d6f 127 }
emh203 0:3d9c67d97d6f 128
emh203 0:3d9c67d97d6f 129 /**
emh203 0:3d9c67d97d6f 130 * @} end of q31_to_x group
emh203 0:3d9c67d97d6f 131 */