diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_q15.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_q15.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_q15.c b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_q15.c new file mode 100644 index 0000000000..5f13ca3cb7 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_q15.c @@ -0,0 +1,161 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2013 ARM Limited. All rights reserved. +* +* $Date: 17. January 2013 +* $Revision: V1.4.1 +* +* Project: CMSIS DSP Library +* Title: arm_cmplx_conj_q15.c +* +* Description: Q15 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 + */ + +/** + * @addtogroup cmplx_conj + * @{ + */ + +/** + * @brief Q15 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. + * + * <b>Scaling and Overflow Behavior:</b> + * \par + * The function uses saturating arithmetic. + * The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF. + */ + +void arm_cmplx_conj_q15( + q15_t * pSrc, + q15_t * pDst, + uint32_t numSamples) +{ + +#ifndef ARM_MATH_CM0_FAMILY + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + uint32_t blkCnt; /* loop counter */ + q31_t in1, in2, in3, in4; + q31_t zero = 0; + + /*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. */ + in1 = *__SIMD32(pSrc)++; + in2 = *__SIMD32(pSrc)++; + in3 = *__SIMD32(pSrc)++; + in4 = *__SIMD32(pSrc)++; + +#ifndef ARM_MATH_BIG_ENDIAN + + in1 = __QASX(zero, in1); + in2 = __QASX(zero, in2); + in3 = __QASX(zero, in3); + in4 = __QASX(zero, in4); + +#else + + in1 = __QSAX(zero, in1); + in2 = __QSAX(zero, in2); + in3 = __QSAX(zero, in3); + in4 = __QSAX(zero, in4); + +#endif // #ifndef ARM_MATH_BIG_ENDIAN + + in1 = ((uint32_t) in1 >> 16) | ((uint32_t) in1 << 16); + in2 = ((uint32_t) in2 >> 16) | ((uint32_t) in2 << 16); + in3 = ((uint32_t) in3 >> 16) | ((uint32_t) in3 << 16); + in4 = ((uint32_t) in4 >> 16) | ((uint32_t) in4 << 16); + + *__SIMD32(pDst)++ = in1; + *__SIMD32(pDst)++ = in2; + *__SIMD32(pDst)++ = in3; + *__SIMD32(pDst)++ = in4; + + /* 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; + + 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. */ + *pDst++ = *pSrc++; + *pDst++ = __SSAT(-*pSrc++, 16); + + /* Decrement the loop counter */ + blkCnt--; + } + +#else + + q15_t in; + + /* Run the below code for Cortex-M0 */ + + while(numSamples > 0u) + { + /* realOut + j (imagOut) = realIn+ j (-1) imagIn */ + /* Calculate Complex Conjugate and then store the results in the destination buffer. */ + *pDst++ = *pSrc++; + in = *pSrc++; + *pDst++ = (in == (q15_t) 0x8000) ? 0x7fff : -in; + + /* Decrement the loop counter */ + numSamples--; + } + +#endif /* #ifndef ARM_MATH_CM0_FAMILY */ + +} + +/** + * @} end of cmplx_conj group + */ |