CMSIS DSP Software Library: arm_float_to_q31.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_float_to_q31.c Go to the documentation of this file.00001 /* ---------------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_float_to_q31.c 00009 * 00010 * Description: Processing function for the Conversion from float to Q31 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3 00013 * 00014 * Version 1.0.3 2010/11/29 00015 * Re-organized the CMSIS folders and updated documentation. 00016 * 00017 * Version 1.0.2 2010/11/11 00018 * Documentation updated. 00019 * 00020 * Version 1.0.1 2010/10/05 00021 * Production release and review comments incorporated. 00022 * 00023 * Version 1.0.0 2010/09/20 00024 * Production release and review comments incorporated. 00025 * ---------------------------------------------------------------------------- */ 00026 00027 #include "arm_math.h" 00028 00066 void arm_float_to_q31( 00067 float32_t * pSrc, 00068 q31_t * pDst, 00069 uint32_t blockSize) 00070 { 00071 float32_t *pIn = pSrc; /* Src pointer */ 00072 uint32_t blkCnt; /* loop counter */ 00073 00074 #ifdef ARM_MATH_ROUNDING 00075 00076 float32_t in; 00077 00078 #endif 00079 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 #ifdef ARM_MATH_ROUNDING 00089 /* C = A * 32768 */ 00090 /* convert from float to Q31 and then store the results in the destination buffer */ 00091 in = *pIn++; 00092 in = (in * 2147483648.0f); 00093 in += in > 0 ? 0.5 : -0.5; 00094 *pDst++ = clip_q63_to_q31((q63_t) (in)); 00095 00096 in = *pIn++; 00097 in = (in * 2147483648.0f); 00098 in += in > 0 ? 0.5 : -0.5; 00099 *pDst++ = clip_q63_to_q31((q63_t) (in)); 00100 00101 in = *pIn++; 00102 in = (in * 2147483648.0f); 00103 in += in > 0 ? 0.5 : -0.5; 00104 *pDst++ = clip_q63_to_q31((q63_t) (in)); 00105 00106 in = *pIn++; 00107 in = (in * 2147483648.0f); 00108 in += in > 0 ? 0.5 : -0.5; 00109 *pDst++ = clip_q63_to_q31((q63_t) (in)); 00110 00111 #else 00112 00113 /* C = A * 2147483648 */ 00114 /* convert from float to Q31 and then store the results in the destination buffer */ 00115 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f)); 00116 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f)); 00117 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f)); 00118 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f)); 00119 00120 #endif 00121 00122 /* Decrement the loop counter */ 00123 blkCnt--; 00124 } 00125 00126 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00127 ** No loop unrolling is used. */ 00128 blkCnt = blockSize % 0x4u; 00129 00130 while(blkCnt > 0u) 00131 { 00132 #ifdef ARM_MATH_ROUNDING 00133 00134 /* C = A * 2147483648 */ 00135 /* convert from float to Q31 and then store the results in the destination buffer */ 00136 in = *pIn++; 00137 in = (in * 2147483648.0f); 00138 in += in > 0 ? 0.5 : -0.5; 00139 *pDst++ = clip_q63_to_q31((q63_t) (in)); 00140 00141 #else 00142 00143 /* C = A * 2147483648 */ 00144 /* convert from float to Q31 and then store the results in the destination buffer */ 00145 *pDst++ = clip_q63_to_q31((q63_t) (*pIn++ * 2147483648.0f)); 00146 00147 #endif 00148 00149 /* Decrement the loop counter */ 00150 blkCnt--; 00151 } 00152 } 00153  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:56 for CMSIS DSP Software Library by  1.7.2

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