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Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_q31.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_q31.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_q31.c b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_q31.c new file mode 100644 index 0000000..984a517 --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_q31.c @@ -0,0 +1,185 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 12. March 2014 +* $Revision: V1.4.4 +* +* Project: CMSIS DSP Library +* Title: arm_cmplx_mag_q31.c +* +* Description: Q31 complex magnitude +* +* 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 + */ + +/** + * @addtogroup cmplx_mag + * @{ + */ + +/** + * @brief Q31 complex magnitude + * @param *pSrc points to the complex input vector + * @param *pDst points to the real output vector + * @param numSamples number of complex samples in the input vector + * @return none. + * + * <b>Scaling and Overflow Behavior:</b> + * \par + * The function implements 1.31 by 1.31 multiplications and finally output is converted into 2.30 format. + * Input down scaling is not required. + */ + +void arm_cmplx_mag_q31( + q31_t * pSrc, + q31_t * pDst, + uint32_t numSamples) +{ + q31_t real, imag; /* Temporary variables to hold input values */ + q31_t acc0, acc1; /* Accumulators */ + uint32_t blkCnt; /* loop counter */ + +#ifndef ARM_MATH_CM0_FAMILY + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + q31_t real1, real2, imag1, imag2; /* Temporary variables to hold input values */ + q31_t out1, out2, out3, out4; /* Accumulators */ + q63_t mul1, mul2, mul3, mul4; /* Temporary variables */ + + + /*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) + { + /* read complex input from source buffer */ + real1 = pSrc[0]; + imag1 = pSrc[1]; + real2 = pSrc[2]; + imag2 = pSrc[3]; + + /* calculate power of input values */ + mul1 = (q63_t) real1 *real1; + mul2 = (q63_t) imag1 *imag1; + mul3 = (q63_t) real2 *real2; + mul4 = (q63_t) imag2 *imag2; + + /* get the result to 3.29 format */ + out1 = (q31_t) (mul1 >> 33); + out2 = (q31_t) (mul2 >> 33); + out3 = (q31_t) (mul3 >> 33); + out4 = (q31_t) (mul4 >> 33); + + /* add real and imaginary accumulators */ + out1 = out1 + out2; + out3 = out3 + out4; + + /* read complex input from source buffer */ + real1 = pSrc[4]; + imag1 = pSrc[5]; + real2 = pSrc[6]; + imag2 = pSrc[7]; + + /* calculate square root */ + arm_sqrt_q31(out1, &pDst[0]); + + /* calculate power of input values */ + mul1 = (q63_t) real1 *real1; + + /* calculate square root */ + arm_sqrt_q31(out3, &pDst[1]); + + /* calculate power of input values */ + mul2 = (q63_t) imag1 *imag1; + mul3 = (q63_t) real2 *real2; + mul4 = (q63_t) imag2 *imag2; + + /* get the result to 3.29 format */ + out1 = (q31_t) (mul1 >> 33); + out2 = (q31_t) (mul2 >> 33); + out3 = (q31_t) (mul3 >> 33); + out4 = (q31_t) (mul4 >> 33); + + /* add real and imaginary accumulators */ + out1 = out1 + out2; + out3 = out3 + out4; + + /* calculate square root */ + arm_sqrt_q31(out1, &pDst[2]); + + /* increment destination by 8 to process next samples */ + pSrc += 8u; + + /* calculate square root */ + arm_sqrt_q31(out3, &pDst[3]); + + /* increment destination by 4 to process next samples */ + pDst += 4u; + + /* 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) + { + /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */ + real = *pSrc++; + imag = *pSrc++; + acc0 = (q31_t) (((q63_t) real * real) >> 33); + acc1 = (q31_t) (((q63_t) imag * imag) >> 33); + /* store the result in 2.30 format in the destination buffer. */ + arm_sqrt_q31(acc0 + acc1, pDst++); + + /* Decrement the loop counter */ + blkCnt--; + } +} + +/** + * @} end of cmplx_mag group + */ |