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Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c new file mode 100644 index 0000000..fab6797 --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c @@ -0,0 +1,182 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 12. March 2014 +* $Revision: V1.4.4 +* +* Project: CMSIS DSP Library +* Title: arm_cmplx_conj_f32.c +* +* Description: Floating-point complex conjugate. +* +* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions +* are met: +* - Redistributions of source code must retain the above copyright +* notice, this list of conditions and the following disclaimer. +* - Redistributions in binary form must reproduce the above copyright +* notice, this list of conditions and the following disclaimer in +* the documentation and/or other materials provided with the +* distribution. +* - Neither the name of ARM LIMITED nor the names of its contributors +* may be used to endorse or promote products derived from this +* software without specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +* POSSIBILITY OF SUCH DAMAGE. +* ---------------------------------------------------------------------------- */ +#include "arm_math.h" + +/** + * @ingroup groupCmplxMath + */ + +/** + * @defgroup cmplx_conj Complex Conjugate + * + * Conjugates the elements of a complex data vector. + * + * The <code>pSrc</code> points to the source data and + * <code>pDst</code> points to the where the result should be written. + * <code>numSamples</code> specifies the number of complex samples + * and the data in each array is stored in an interleaved fashion + * (real, imag, real, imag, ...). + * Each array has a total of <code>2*numSamples</code> values. + * The underlying algorithm is used: + * + * <pre> + * for(n=0; n<numSamples; n++) { + * pDst[(2*n)+0)] = pSrc[(2*n)+0]; // real part + * pDst[(2*n)+1)] = -pSrc[(2*n)+1]; // imag part + * } + * </pre> + * + * There are separate functions for floating-point, Q15, and Q31 data types. + */ + +/** + * @addtogroup cmplx_conj + * @{ + */ + +/** + * @brief Floating-point complex conjugate. + * @param *pSrc points to the input vector + * @param *pDst points to the output vector + * @param numSamples number of complex samples in each vector + * @return none. + */ + +void arm_cmplx_conj_f32( + float32_t * pSrc, + float32_t * pDst, + uint32_t numSamples) +{ + uint32_t blkCnt; /* loop counter */ + +#ifndef ARM_MATH_CM0_FAMILY + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + float32_t inR1, inR2, inR3, inR4; + float32_t inI1, inI2, inI3, inI4; + + /*loop Unrolling */ + blkCnt = numSamples >> 2u; + + /* First part of the processing with loop unrolling. Compute 4 outputs at a time. + ** a second loop below computes the remaining 1 to 3 samples. */ + while(blkCnt > 0u) + { + /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ + /* Calculate Complex Conjugate and then store the results in the destination buffer. */ + /* read real input samples */ + inR1 = pSrc[0]; + /* store real samples to destination */ + pDst[0] = inR1; + inR2 = pSrc[2]; + pDst[2] = inR2; + inR3 = pSrc[4]; + pDst[4] = inR3; + inR4 = pSrc[6]; + pDst[6] = inR4; + + /* read imaginary input samples */ + inI1 = pSrc[1]; + inI2 = pSrc[3]; + + /* conjugate input */ + inI1 = -inI1; + + /* read imaginary input samples */ + inI3 = pSrc[5]; + + /* conjugate input */ + inI2 = -inI2; + + /* read imaginary input samples */ + inI4 = pSrc[7]; + + /* conjugate input */ + inI3 = -inI3; + + /* store imaginary samples to destination */ + pDst[1] = inI1; + pDst[3] = inI2; + + /* conjugate input */ + inI4 = -inI4; + + /* store imaginary samples to destination */ + pDst[5] = inI3; + + /* increment source pointer by 8 to process next sampels */ + pSrc += 8u; + + /* store imaginary sample to destination */ + pDst[7] = inI4; + + /* increment destination pointer by 8 to store next samples */ + pDst += 8u; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* If the numSamples is not a multiple of 4, compute any remaining output samples here. + ** No loop unrolling is used. */ + blkCnt = numSamples % 0x4u; + +#else + + /* Run the below code for Cortex-M0 */ + blkCnt = numSamples; + +#endif /* #ifndef ARM_MATH_CM0_FAMILY */ + + while(blkCnt > 0u) + { + /* realOut + j (imagOut) = realIn + j (-1) imagIn */ + /* Calculate Complex Conjugate and then store the results in the destination buffer. */ + *pDst++ = *pSrc++; + *pDst++ = -*pSrc++; + + /* Decrement the loop counter */ + blkCnt--; + } +} + +/** + * @} end of cmplx_conj group + */ |