diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/TransformFunctions/arm_rfft_f32.c')
-rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/TransformFunctions/arm_rfft_f32.c | 329 |
1 files changed, 0 insertions, 329 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/TransformFunctions/arm_rfft_f32.c b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/TransformFunctions/arm_rfft_f32.c deleted file mode 100644 index bb3f35dd41..0000000000 --- a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/TransformFunctions/arm_rfft_f32.c +++ /dev/null @@ -1,329 +0,0 @@ -/* ---------------------------------------------------------------------- -* Copyright (C) 2010-2013 ARM Limited. All rights reserved. -* -* $Date: 17. January 2013 -* $Revision: V1.4.1 -* -* Project: CMSIS DSP Library -* Title: arm_rfft_f32.c -* -* Description: RFFT & RIFFT Floating point process function -* -* 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" - -extern void arm_radix4_butterfly_f32( - float32_t * pSrc, - uint16_t fftLen, - float32_t * pCoef, - uint16_t twidCoefModifier); - -extern void arm_radix4_butterfly_inverse_f32( - float32_t * pSrc, - uint16_t fftLen, - float32_t * pCoef, - uint16_t twidCoefModifier, - float32_t onebyfftLen); - -extern void arm_bitreversal_f32( - float32_t * pSrc, - uint16_t fftSize, - uint16_t bitRevFactor, - uint16_t * pBitRevTab); - -/** - * @ingroup groupTransforms - */ - -/*-------------------------------------------------------------------- - * Internal functions prototypes - *--------------------------------------------------------------------*/ - -void arm_split_rfft_f32( - float32_t * pSrc, - uint32_t fftLen, - float32_t * pATable, - float32_t * pBTable, - float32_t * pDst, - uint32_t modifier); -void arm_split_rifft_f32( - float32_t * pSrc, - uint32_t fftLen, - float32_t * pATable, - float32_t * pBTable, - float32_t * pDst, - uint32_t modifier); - -/** - * @addtogroup RealFFT - * @{ - */ - -/** - * @brief Processing function for the floating-point RFFT/RIFFT. - * @deprecated Do not use this function. It has been superceded by \ref arm_rfft_fast_f32 and will be removed - * in the future. - * @param[in] *S points to an instance of the floating-point RFFT/RIFFT structure. - * @param[in] *pSrc points to the input buffer. - * @param[out] *pDst points to the output buffer. - * @return none. - */ - -void arm_rfft_f32( - const arm_rfft_instance_f32 * S, - float32_t * pSrc, - float32_t * pDst) -{ - const arm_cfft_radix4_instance_f32 *S_CFFT = S->pCfft; - - - /* Calculation of Real IFFT of input */ - if(S->ifftFlagR == 1u) - { - /* Real IFFT core process */ - arm_split_rifft_f32(pSrc, S->fftLenBy2, S->pTwiddleAReal, - S->pTwiddleBReal, pDst, S->twidCoefRModifier); - - - /* Complex radix-4 IFFT process */ - arm_radix4_butterfly_inverse_f32(pDst, S_CFFT->fftLen, - S_CFFT->pTwiddle, - S_CFFT->twidCoefModifier, - S_CFFT->onebyfftLen); - - /* Bit reversal process */ - if(S->bitReverseFlagR == 1u) - { - arm_bitreversal_f32(pDst, S_CFFT->fftLen, - S_CFFT->bitRevFactor, S_CFFT->pBitRevTable); - } - } - else - { - - /* Calculation of RFFT of input */ - - /* Complex radix-4 FFT process */ - arm_radix4_butterfly_f32(pSrc, S_CFFT->fftLen, - S_CFFT->pTwiddle, S_CFFT->twidCoefModifier); - - /* Bit reversal process */ - if(S->bitReverseFlagR == 1u) - { - arm_bitreversal_f32(pSrc, S_CFFT->fftLen, - S_CFFT->bitRevFactor, S_CFFT->pBitRevTable); - } - - - /* Real FFT core process */ - arm_split_rfft_f32(pSrc, S->fftLenBy2, S->pTwiddleAReal, - S->pTwiddleBReal, pDst, S->twidCoefRModifier); - } - -} - -/** - * @} end of RealFFT group - */ - -/** - * @brief Core Real FFT process - * @param[in] *pSrc points to the input buffer. - * @param[in] fftLen length of FFT. - * @param[in] *pATable points to the twiddle Coef A buffer. - * @param[in] *pBTable points to the twiddle Coef B buffer. - * @param[out] *pDst points to the output buffer. - * @param[in] modifier twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table. - * @return none. - */ - -void arm_split_rfft_f32( - float32_t * pSrc, - uint32_t fftLen, - float32_t * pATable, - float32_t * pBTable, - float32_t * pDst, - uint32_t modifier) -{ - uint32_t i; /* Loop Counter */ - float32_t outR, outI; /* Temporary variables for output */ - float32_t *pCoefA, *pCoefB; /* Temporary pointers for twiddle factors */ - float32_t CoefA1, CoefA2, CoefB1; /* Temporary variables for twiddle coefficients */ - float32_t *pDst1 = &pDst[2], *pDst2 = &pDst[(4u * fftLen) - 1u]; /* temp pointers for output buffer */ - float32_t *pSrc1 = &pSrc[2], *pSrc2 = &pSrc[(2u * fftLen) - 1u]; /* temp pointers for input buffer */ - - /* Init coefficient pointers */ - pCoefA = &pATable[modifier * 2u]; - pCoefB = &pBTable[modifier * 2u]; - - i = fftLen - 1u; - - while(i > 0u) - { - /* - outR = (pSrc[2 * i] * pATable[2 * i] - pSrc[2 * i + 1] * pATable[2 * i + 1] - + pSrc[2 * n - 2 * i] * pBTable[2 * i] + - pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); - */ - - /* outI = (pIn[2 * i + 1] * pATable[2 * i] + pIn[2 * i] * pATable[2 * i + 1] + - pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - - pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); */ - - /* read pATable[2 * i] */ - CoefA1 = *pCoefA++; - /* pATable[2 * i + 1] */ - CoefA2 = *pCoefA; - - /* pSrc[2 * i] * pATable[2 * i] */ - outR = *pSrc1 * CoefA1; - /* pSrc[2 * i] * CoefA2 */ - outI = *pSrc1++ * CoefA2; - - /* (pSrc[2 * i + 1] + pSrc[2 * fftLen - 2 * i + 1]) * CoefA2 */ - outR -= (*pSrc1 + *pSrc2) * CoefA2; - /* pSrc[2 * i + 1] * CoefA1 */ - outI += *pSrc1++ * CoefA1; - - CoefB1 = *pCoefB; - - /* pSrc[2 * fftLen - 2 * i + 1] * CoefB1 */ - outI -= *pSrc2-- * CoefB1; - /* pSrc[2 * fftLen - 2 * i] * CoefA2 */ - outI -= *pSrc2 * CoefA2; - - /* pSrc[2 * fftLen - 2 * i] * CoefB1 */ - outR += *pSrc2-- * CoefB1; - - /* write output */ - *pDst1++ = outR; - *pDst1++ = outI; - - /* write complex conjugate output */ - *pDst2-- = -outI; - *pDst2-- = outR; - - /* update coefficient pointer */ - pCoefB = pCoefB + (modifier * 2u); - pCoefA = pCoefA + ((modifier * 2u) - 1u); - - i--; - - } - - pDst[2u * fftLen] = pSrc[0] - pSrc[1]; - pDst[(2u * fftLen) + 1u] = 0.0f; - - pDst[0] = pSrc[0] + pSrc[1]; - pDst[1] = 0.0f; - -} - - -/** - * @brief Core Real IFFT process - * @param[in] *pSrc points to the input buffer. - * @param[in] fftLen length of FFT. - * @param[in] *pATable points to the twiddle Coef A buffer. - * @param[in] *pBTable points to the twiddle Coef B buffer. - * @param[out] *pDst points to the output buffer. - * @param[in] modifier twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table. - * @return none. - */ - -void arm_split_rifft_f32( - float32_t * pSrc, - uint32_t fftLen, - float32_t * pATable, - float32_t * pBTable, - float32_t * pDst, - uint32_t modifier) -{ - float32_t outR, outI; /* Temporary variables for output */ - float32_t *pCoefA, *pCoefB; /* Temporary pointers for twiddle factors */ - float32_t CoefA1, CoefA2, CoefB1; /* Temporary variables for twiddle coefficients */ - float32_t *pSrc1 = &pSrc[0], *pSrc2 = &pSrc[(2u * fftLen) + 1u]; - - pCoefA = &pATable[0]; - pCoefB = &pBTable[0]; - - while(fftLen > 0u) - { - /* - outR = (pIn[2 * i] * pATable[2 * i] + pIn[2 * i + 1] * pATable[2 * i + 1] + - pIn[2 * n - 2 * i] * pBTable[2 * i] - - pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1]); - - outI = (pIn[2 * i + 1] * pATable[2 * i] - pIn[2 * i] * pATable[2 * i + 1] - - pIn[2 * n - 2 * i] * pBTable[2 * i + 1] - - pIn[2 * n - 2 * i + 1] * pBTable[2 * i]); - - */ - - CoefA1 = *pCoefA++; - CoefA2 = *pCoefA; - - /* outR = (pSrc[2 * i] * CoefA1 */ - outR = *pSrc1 * CoefA1; - - /* - pSrc[2 * i] * CoefA2 */ - outI = -(*pSrc1++) * CoefA2; - - /* (pSrc[2 * i + 1] + pSrc[2 * fftLen - 2 * i + 1]) * CoefA2 */ - outR += (*pSrc1 + *pSrc2) * CoefA2; - - /* pSrc[2 * i + 1] * CoefA1 */ - outI += (*pSrc1++) * CoefA1; - - CoefB1 = *pCoefB; - - /* - pSrc[2 * fftLen - 2 * i + 1] * CoefB1 */ - outI -= *pSrc2-- * CoefB1; - - /* pSrc[2 * fftLen - 2 * i] * CoefB1 */ - outR += *pSrc2 * CoefB1; - - /* pSrc[2 * fftLen - 2 * i] * CoefA2 */ - outI += *pSrc2-- * CoefA2; - - /* write output */ - *pDst++ = outR; - *pDst++ = outI; - - /* update coefficient pointer */ - pCoefB = pCoefB + (modifier * 2u); - pCoefA = pCoefA + ((modifier * 2u) - 1u); - - /* Decrement loop count */ - fftLen--; - } - -} |