Robert Lopez
Aded CMSIS5 DSP and NN folder. Needs some work
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arm_float_to_q7.c
00001 /* ---------------------------------------------------------------------- 00002 * Project: CMSIS DSP Library 00003 * Title: arm_float_to_q7.c 00004 * Description: Converts the elements of the floating-point vector to Q7 vector 00005 * 00006 * $Date: 27. January 2017 00007 * $Revision: V.1.5.1 00008 * 00009 * Target Processor: Cortex-M cores 00010 * -------------------------------------------------------------------- */ 00011 /* 00012 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. 00013 * 00014 * SPDX-License-Identifier: Apache-2.0 00015 * 00016 * Licensed under the Apache License, Version 2.0 (the License); you may 00017 * not use this file except in compliance with the License. 00018 * You may obtain a copy of the License at 00019 * 00020 * www.apache.org/licenses/LICENSE-2.0 00021 * 00022 * Unless required by applicable law or agreed to in writing, software 00023 * distributed under the License is distributed on an AS IS BASIS, WITHOUT 00024 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00025 * See the License for the specific language governing permissions and 00026 * limitations under the License. 00027 */ 00028 00029 #include "arm_math.h" 00030 00031 /** 00032 * @ingroup groupSupport 00033 */ 00034 00035 /** 00036 * @addtogroup float_to_x 00037 * @{ 00038 */ 00039 00040 /** 00041 * @brief Converts the elements of the floating-point vector to Q7 vector. 00042 * @param[in] *pSrc points to the floating-point input vector 00043 * @param[out] *pDst points to the Q7 output vector 00044 * @param[in] blockSize length of the input vector 00045 * @return none. 00046 * 00047 *\par Description: 00048 * \par 00049 * The equation used for the conversion process is: 00050 * <pre> 00051 * pDst[n] = (q7_t)(pSrc[n] * 128); 0 <= n < blockSize. 00052 * </pre> 00053 * \par Scaling and Overflow Behavior: 00054 * \par 00055 * The function uses saturating arithmetic. 00056 * Results outside of the allowable Q7 range [0x80 0x7F] will be saturated. 00057 * \note 00058 * In order to apply rounding, the library should be rebuilt with the ROUNDING macro 00059 * defined in the preprocessor section of project options. 00060 */ 00061 00062 00063 void arm_float_to_q7( 00064 float32_t * pSrc, 00065 q7_t * pDst, 00066 uint32_t blockSize) 00067 { 00068 float32_t *pIn = pSrc; /* Src pointer */ 00069 uint32_t blkCnt; /* loop counter */ 00070 00071 #ifdef ARM_MATH_ROUNDING 00072 00073 float32_t in; 00074 00075 #endif /* #ifdef ARM_MATH_ROUNDING */ 00076 00077 #if defined (ARM_MATH_DSP) 00078 00079 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00080 00081 /*loop Unrolling */ 00082 blkCnt = blockSize >> 2U; 00083 00084 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00085 ** a second loop below computes the remaining 1 to 3 samples. */ 00086 while (blkCnt > 0U) 00087 { 00088 00089 #ifdef ARM_MATH_ROUNDING 00090 /* C = A * 128 */ 00091 /* convert from float to q7 and then store the results in the destination buffer */ 00092 in = *pIn++; 00093 in = (in * 128); 00094 in += in > 0.0f ? 0.5f : -0.5f; 00095 *pDst++ = (q7_t) (__SSAT((q15_t) (in), 8)); 00096 00097 in = *pIn++; 00098 in = (in * 128); 00099 in += in > 0.0f ? 0.5f : -0.5f; 00100 *pDst++ = (q7_t) (__SSAT((q15_t) (in), 8)); 00101 00102 in = *pIn++; 00103 in = (in * 128); 00104 in += in > 0.0f ? 0.5f : -0.5f; 00105 *pDst++ = (q7_t) (__SSAT((q15_t) (in), 8)); 00106 00107 in = *pIn++; 00108 in = (in * 128); 00109 in += in > 0.0f ? 0.5f : -0.5f; 00110 *pDst++ = (q7_t) (__SSAT((q15_t) (in), 8)); 00111 00112 #else 00113 00114 /* C = A * 128 */ 00115 /* convert from float to q7 and then store the results in the destination buffer */ 00116 *pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8); 00117 *pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8); 00118 *pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8); 00119 *pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8); 00120 00121 #endif /* #ifdef ARM_MATH_ROUNDING */ 00122 00123 /* Decrement the loop counter */ 00124 blkCnt--; 00125 } 00126 00127 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00128 ** No loop unrolling is used. */ 00129 blkCnt = blockSize % 0x4U; 00130 00131 while (blkCnt > 0U) 00132 { 00133 00134 #ifdef ARM_MATH_ROUNDING 00135 /* C = A * 128 */ 00136 /* convert from float to q7 and then store the results in the destination buffer */ 00137 in = *pIn++; 00138 in = (in * 128); 00139 in += in > 0.0f ? 0.5f : -0.5f; 00140 *pDst++ = (q7_t) (__SSAT((q15_t) (in), 8)); 00141 00142 #else 00143 00144 /* C = A * 128 */ 00145 /* convert from float to q7 and then store the results in the destination buffer */ 00146 *pDst++ = __SSAT((q31_t) (*pIn++ * 128.0f), 8); 00147 00148 #endif /* #ifdef ARM_MATH_ROUNDING */ 00149 00150 /* Decrement the loop counter */ 00151 blkCnt--; 00152 } 00153 00154 00155 #else 00156 00157 /* Run the below code for Cortex-M0 */ 00158 00159 00160 /* Loop over blockSize number of values */ 00161 blkCnt = blockSize; 00162 00163 while (blkCnt > 0U) 00164 { 00165 #ifdef ARM_MATH_ROUNDING 00166 /* C = A * 128 */ 00167 /* convert from float to q7 and then store the results in the destination buffer */ 00168 in = *pIn++; 00169 in = (in * 128.0f); 00170 in += in > 0 ? 0.5f : -0.5f; 00171 *pDst++ = (q7_t) (__SSAT((q31_t) (in), 8)); 00172 00173 #else 00174 00175 /* C = A * 128 */ 00176 /* convert from float to q7 and then store the results in the destination buffer */ 00177 *pDst++ = (q7_t) __SSAT((q31_t) (*pIn++ * 128.0f), 8); 00178 00179 #endif /* #ifdef ARM_MATH_ROUNDING */ 00180 00181 /* Decrement the loop counter */ 00182 blkCnt--; 00183 } 00184 00185 #endif /* #if defined (ARM_MATH_DSP) */ 00186 00187 } 00188 00189 /** 00190 * @} end of float_to_x group 00191 */ 00192
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