Analog Devices / Mbed OS EVAL-CN0540-ARDZ

Dependencies:   platform_drivers LTC26X6 AD77681

CMSIS-DSP_Lib/Source/BasicMathFunctions/arm_scale_q7.c@1:9dd7c64b4a64, 2021-12-06 (annotated)

Committer:
jngarlitos
Date:
Mon Dec 06 05:22:28 2021 +0000
Revision:
1:9dd7c64b4a64
EVAL-CN0540-ARDZ mbed example program Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jngarlitos 1:9dd7c64b4a64 1 /* ----------------------------------------------------------------------
jngarlitos 1:9dd7c64b4a64 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
jngarlitos 1:9dd7c64b4a64 3 *
jngarlitos 1:9dd7c64b4a64 4 * $Date: 19. March 2015
jngarlitos 1:9dd7c64b4a64 5 * $Revision: V.1.4.5
jngarlitos 1:9dd7c64b4a64 6 *
jngarlitos 1:9dd7c64b4a64 7 * Project: CMSIS DSP Library
jngarlitos 1:9dd7c64b4a64 8 * Title: arm_scale_q7.c
jngarlitos 1:9dd7c64b4a64 9 *
jngarlitos 1:9dd7c64b4a64 10 * Description: Multiplies a Q7 vector by a scalar.
jngarlitos 1:9dd7c64b4a64 11 *
jngarlitos 1:9dd7c64b4a64 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
jngarlitos 1:9dd7c64b4a64 13 *
jngarlitos 1:9dd7c64b4a64 14 * Redistribution and use in source and binary forms, with or without
jngarlitos 1:9dd7c64b4a64 15 * modification, are permitted provided that the following conditions
jngarlitos 1:9dd7c64b4a64 16 * are met:
jngarlitos 1:9dd7c64b4a64 17 * - Redistributions of source code must retain the above copyright
jngarlitos 1:9dd7c64b4a64 18 * notice, this list of conditions and the following disclaimer.
jngarlitos 1:9dd7c64b4a64 19 * - Redistributions in binary form must reproduce the above copyright
jngarlitos 1:9dd7c64b4a64 20 * notice, this list of conditions and the following disclaimer in
jngarlitos 1:9dd7c64b4a64 21 * the documentation and/or other materials provided with the
jngarlitos 1:9dd7c64b4a64 22 * distribution.
jngarlitos 1:9dd7c64b4a64 23 * - Neither the name of ARM LIMITED nor the names of its contributors
jngarlitos 1:9dd7c64b4a64 24 * may be used to endorse or promote products derived from this
jngarlitos 1:9dd7c64b4a64 25 * software without specific prior written permission.
jngarlitos 1:9dd7c64b4a64 26 *
jngarlitos 1:9dd7c64b4a64 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
jngarlitos 1:9dd7c64b4a64 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
jngarlitos 1:9dd7c64b4a64 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
jngarlitos 1:9dd7c64b4a64 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
jngarlitos 1:9dd7c64b4a64 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
jngarlitos 1:9dd7c64b4a64 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
jngarlitos 1:9dd7c64b4a64 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
jngarlitos 1:9dd7c64b4a64 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
jngarlitos 1:9dd7c64b4a64 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
jngarlitos 1:9dd7c64b4a64 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
jngarlitos 1:9dd7c64b4a64 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
jngarlitos 1:9dd7c64b4a64 38 * POSSIBILITY OF SUCH DAMAGE.
jngarlitos 1:9dd7c64b4a64 39 * -------------------------------------------------------------------- */
jngarlitos 1:9dd7c64b4a64 40
jngarlitos 1:9dd7c64b4a64 41 #include "arm_math.h"
jngarlitos 1:9dd7c64b4a64 42
jngarlitos 1:9dd7c64b4a64 43 /**
jngarlitos 1:9dd7c64b4a64 44 * @ingroup groupMath
jngarlitos 1:9dd7c64b4a64 45 */
jngarlitos 1:9dd7c64b4a64 46
jngarlitos 1:9dd7c64b4a64 47 /**
jngarlitos 1:9dd7c64b4a64 48 * @addtogroup scale
jngarlitos 1:9dd7c64b4a64 49 * @{
jngarlitos 1:9dd7c64b4a64 50 */
jngarlitos 1:9dd7c64b4a64 51
jngarlitos 1:9dd7c64b4a64 52 /**
jngarlitos 1:9dd7c64b4a64 53 * @brief Multiplies a Q7 vector by a scalar.
jngarlitos 1:9dd7c64b4a64 54 * @param[in] *pSrc points to the input vector
jngarlitos 1:9dd7c64b4a64 55 * @param[in] scaleFract fractional portion of the scale value
jngarlitos 1:9dd7c64b4a64 56 * @param[in] shift number of bits to shift the result by
jngarlitos 1:9dd7c64b4a64 57 * @param[out] *pDst points to the output vector
jngarlitos 1:9dd7c64b4a64 58 * @param[in] blockSize number of samples in the vector
jngarlitos 1:9dd7c64b4a64 59 * @return none.
jngarlitos 1:9dd7c64b4a64 60 *
jngarlitos 1:9dd7c64b4a64 61 * <b>Scaling and Overflow Behavior:</b>
jngarlitos 1:9dd7c64b4a64 62 * \par
jngarlitos 1:9dd7c64b4a64 63 * The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.7 format.
jngarlitos 1:9dd7c64b4a64 64 * These are multiplied to yield a 2.14 intermediate result and this is shifted with saturation to 1.7 format.
jngarlitos 1:9dd7c64b4a64 65 */
jngarlitos 1:9dd7c64b4a64 66
jngarlitos 1:9dd7c64b4a64 67 void arm_scale_q7(
jngarlitos 1:9dd7c64b4a64 68 q7_t * pSrc,
jngarlitos 1:9dd7c64b4a64 69 q7_t scaleFract,
jngarlitos 1:9dd7c64b4a64 70 int8_t shift,
jngarlitos 1:9dd7c64b4a64 71 q7_t * pDst,
jngarlitos 1:9dd7c64b4a64 72 uint32_t blockSize)
jngarlitos 1:9dd7c64b4a64 73 {
jngarlitos 1:9dd7c64b4a64 74 int8_t kShift = 7 - shift; /* shift to apply after scaling */
jngarlitos 1:9dd7c64b4a64 75 uint32_t blkCnt; /* loop counter */
jngarlitos 1:9dd7c64b4a64 76
jngarlitos 1:9dd7c64b4a64 77 #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 78
jngarlitos 1:9dd7c64b4a64 79 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 80 q7_t in1, in2, in3, in4, out1, out2, out3, out4; /* Temporary variables to store input & output */
jngarlitos 1:9dd7c64b4a64 81
jngarlitos 1:9dd7c64b4a64 82
jngarlitos 1:9dd7c64b4a64 83 /*loop Unrolling */
jngarlitos 1:9dd7c64b4a64 84 blkCnt = blockSize >> 2u;
jngarlitos 1:9dd7c64b4a64 85
jngarlitos 1:9dd7c64b4a64 86
jngarlitos 1:9dd7c64b4a64 87 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
jngarlitos 1:9dd7c64b4a64 88 ** a second loop below computes the remaining 1 to 3 samples. */
jngarlitos 1:9dd7c64b4a64 89 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 90 {
jngarlitos 1:9dd7c64b4a64 91 /* Reading 4 inputs from memory */
jngarlitos 1:9dd7c64b4a64 92 in1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 93 in2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 94 in3 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 95 in4 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 96
jngarlitos 1:9dd7c64b4a64 97 /* C = A * scale */
jngarlitos 1:9dd7c64b4a64 98 /* Scale the inputs and then store the results in the temporary variables. */
jngarlitos 1:9dd7c64b4a64 99 out1 = (q7_t) (__SSAT(((in1) * scaleFract) >> kShift, 8));
jngarlitos 1:9dd7c64b4a64 100 out2 = (q7_t) (__SSAT(((in2) * scaleFract) >> kShift, 8));
jngarlitos 1:9dd7c64b4a64 101 out3 = (q7_t) (__SSAT(((in3) * scaleFract) >> kShift, 8));
jngarlitos 1:9dd7c64b4a64 102 out4 = (q7_t) (__SSAT(((in4) * scaleFract) >> kShift, 8));
jngarlitos 1:9dd7c64b4a64 103
jngarlitos 1:9dd7c64b4a64 104 /* Packing the individual outputs into 32bit and storing in
jngarlitos 1:9dd7c64b4a64 105 * destination buffer in single write */
jngarlitos 1:9dd7c64b4a64 106 *__SIMD32(pDst)++ = __PACKq7(out1, out2, out3, out4);
jngarlitos 1:9dd7c64b4a64 107
jngarlitos 1:9dd7c64b4a64 108 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 109 blkCnt--;
jngarlitos 1:9dd7c64b4a64 110 }
jngarlitos 1:9dd7c64b4a64 111
jngarlitos 1:9dd7c64b4a64 112 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
jngarlitos 1:9dd7c64b4a64 113 ** No loop unrolling is used. */
jngarlitos 1:9dd7c64b4a64 114 blkCnt = blockSize % 0x4u;
jngarlitos 1:9dd7c64b4a64 115
jngarlitos 1:9dd7c64b4a64 116 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 117 {
jngarlitos 1:9dd7c64b4a64 118 /* C = A * scale */
jngarlitos 1:9dd7c64b4a64 119 /* Scale the input and then store the result in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 120 *pDst++ = (q7_t) (__SSAT(((*pSrc++) * scaleFract) >> kShift, 8));
jngarlitos 1:9dd7c64b4a64 121
jngarlitos 1:9dd7c64b4a64 122 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 123 blkCnt--;
jngarlitos 1:9dd7c64b4a64 124 }
jngarlitos 1:9dd7c64b4a64 125
jngarlitos 1:9dd7c64b4a64 126 #else
jngarlitos 1:9dd7c64b4a64 127
jngarlitos 1:9dd7c64b4a64 128 /* Run the below code for Cortex-M0 */
jngarlitos 1:9dd7c64b4a64 129
jngarlitos 1:9dd7c64b4a64 130 /* Initialize blkCnt with number of samples */
jngarlitos 1:9dd7c64b4a64 131 blkCnt = blockSize;
jngarlitos 1:9dd7c64b4a64 132
jngarlitos 1:9dd7c64b4a64 133 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 134 {
jngarlitos 1:9dd7c64b4a64 135 /* C = A * scale */
jngarlitos 1:9dd7c64b4a64 136 /* Scale the input and then store the result in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 137 *pDst++ = (q7_t) (__SSAT((((q15_t) * pSrc++ * scaleFract) >> kShift), 8));
jngarlitos 1:9dd7c64b4a64 138
jngarlitos 1:9dd7c64b4a64 139 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 140 blkCnt--;
jngarlitos 1:9dd7c64b4a64 141 }
jngarlitos 1:9dd7c64b4a64 142
jngarlitos 1:9dd7c64b4a64 143 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
jngarlitos 1:9dd7c64b4a64 144
jngarlitos 1:9dd7c64b4a64 145 }
jngarlitos 1:9dd7c64b4a64 146
jngarlitos 1:9dd7c64b4a64 147 /**
jngarlitos 1:9dd7c64b4a64 148 * @} end of scale group
jngarlitos 1:9dd7c64b4a64 149 */