00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 15. July 2011 00005 * $Revision: V1.0.10 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_cmplx_conj_q15.c 00009 * 00010 * Description: Q15 complex conjugate. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Version 1.0.10 2011/7/15 00015 * Big Endian support added and Merged M0 and M3/M4 Source code. 00016 * 00017 * Version 1.0.3 2010/11/29 00018 * Re-organized the CMSIS folders and updated documentation. 00019 * 00020 * Version 1.0.2 2010/11/11 00021 * Documentation updated. 00022 * 00023 * Version 1.0.1 2010/10/05 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 1.0.0 2010/09/20 00027 * Production release and review comments incorporated. 00028 * ---------------------------------------------------------------------------- */ 00029 00030 #include "arm_math.h" 00031 00054 void arm_cmplx_conj_q15( 00055 q15_t * pSrc, 00056 q15_t * pDst, 00057 uint32_t numSamples) 00058 { 00059 00060 #ifndef ARM_MATH_CM0 00061 00062 /* Run the below code for Cortex-M4 and Cortex-M3 */ 00063 uint32_t blkCnt; /* loop counter */ 00064 00065 /*loop Unrolling */ 00066 blkCnt = numSamples >> 2u; 00067 00068 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00069 ** a second loop below computes the remaining 1 to 3 samples. */ 00070 while(blkCnt > 0u) 00071 { 00072 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00073 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00074 *pDst++ = *pSrc++; 00075 *pDst++ = __SSAT(-*pSrc++, 16); 00076 *pDst++ = *pSrc++; 00077 *pDst++ = __SSAT(-*pSrc++, 16); 00078 *pDst++ = *pSrc++; 00079 *pDst++ = __SSAT(-*pSrc++, 16); 00080 *pDst++ = *pSrc++; 00081 *pDst++ = __SSAT(-*pSrc++, 16); 00082 00083 /* Decrement the loop counter */ 00084 blkCnt--; 00085 } 00086 00087 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00088 ** No loop unrolling is used. */ 00089 blkCnt = numSamples % 0x4u; 00090 00091 while(blkCnt > 0u) 00092 { 00093 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ 00094 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00095 *pDst++ = *pSrc++; 00096 *pDst++ = __SSAT(-*pSrc++, 16); 00097 00098 /* Decrement the loop counter */ 00099 blkCnt--; 00100 } 00101 00102 #else 00103 00104 /* Run the below code for Cortex-M0 */ 00105 00106 while(numSamples > 0u) 00107 { 00108 /* realOut + j (imagOut) = realIn+ j (-1) imagIn */ 00109 /* Calculate Complex Conjugate and then store the results in the destination buffer. */ 00110 *pDst++ = *pSrc++; 00111 *pDst++ = -*pSrc++; 00112 00113 /* Decrement the loop counter */ 00114 numSamples--; 00115 } 00116 00117 #endif /* #ifndef ARM_MATH_CM0 */ 00118 00119 } 00120