From 96d6da4e252b06dcfdc041e7df23e86161c33007 Mon Sep 17 00:00:00 2001 From: rihab kouki Date: Tue, 28 Jul 2020 11:24:49 +0100 Subject: Official ARM version: v5.6.0 --- DSP/Source/TransformFunctions/arm_rfft_q31.c | 433 ++++++++++++++------------- 1 file changed, 221 insertions(+), 212 deletions(-) (limited to 'DSP/Source/TransformFunctions/arm_rfft_q31.c') diff --git a/DSP/Source/TransformFunctions/arm_rfft_q31.c b/DSP/Source/TransformFunctions/arm_rfft_q31.c index 5386140..d16600d 100644 --- a/DSP/Source/TransformFunctions/arm_rfft_q31.c +++ b/DSP/Source/TransformFunctions/arm_rfft_q31.c @@ -3,13 +3,13 @@ * Title: arm_rfft_q31.c * Description: FFT & RIFFT Q31 process function * - * $Date: 27. January 2017 - * $Revision: V.1.5.1 + * $Date: 18. March 2019 + * $Revision: V1.6.0 * * Target Processor: Cortex-M cores * -------------------------------------------------------------------- */ /* - * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. + * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * @@ -33,251 +33,260 @@ * -------------------------------------------------------------------- */ void arm_split_rfft_q31( - q31_t * pSrc, - uint32_t fftLen, - q31_t * pATable, - q31_t * pBTable, - q31_t * pDst, - uint32_t modifier); + q31_t * pSrc, + uint32_t fftLen, + const q31_t * pATable, + const q31_t * pBTable, + q31_t * pDst, + uint32_t modifier); void arm_split_rifft_q31( - q31_t * pSrc, - uint32_t fftLen, - q31_t * pATable, - q31_t * pBTable, - q31_t * pDst, - uint32_t modifier); + q31_t * pSrc, + uint32_t fftLen, + const q31_t * pATable, + const q31_t * pBTable, + q31_t * pDst, + uint32_t modifier); /** -* @addtogroup RealFFT -* @{ -*/ + @addtogroup RealFFT + @{ + */ /** -* @brief Processing function for the Q31 RFFT/RIFFT. -* @param[in] *S points to an instance of the Q31 RFFT/RIFFT structure. -* @param[in] *pSrc points to the input buffer. -* @param[out] *pDst points to the output buffer. -* @return none. -* -* \par Input an output formats: -* \par -* Internally input is downscaled by 2 for every stage to avoid saturations inside CFFT/CIFFT process. -* Hence the output format is different for different RFFT sizes. -* The input and output formats for different RFFT sizes and number of bits to upscale are mentioned in the tables below for RFFT and RIFFT: -* \par -* \image html RFFTQ31.gif "Input and Output Formats for Q31 RFFT" -* -* \par -* \image html RIFFTQ31.gif "Input and Output Formats for Q31 RIFFT" -*/ + @brief Processing function for the Q31 RFFT/RIFFT. + @param[in] S points to an instance of the Q31 RFFT/RIFFT structure + @param[in] pSrc points to input buffer + @param[out] pDst points to output buffer + @return none + + @par Input an output formats + Internally input is downscaled by 2 for every stage to avoid saturations inside CFFT/CIFFT process. + Hence the output format is different for different RFFT sizes. + The input and output formats for different RFFT sizes and number of bits to upscale are mentioned in the tables below for RFFT and RIFFT: + @par + \image html RFFTQ31.gif "Input and Output Formats for Q31 RFFT" + @par + \image html RIFFTQ31.gif "Input and Output Formats for Q31 RIFFT" + */ + void arm_rfft_q31( - const arm_rfft_instance_q31 * S, - q31_t * pSrc, - q31_t * pDst) + const arm_rfft_instance_q31 * S, + q31_t * pSrc, + q31_t * pDst) { - const arm_cfft_instance_q31 *S_CFFT = S->pCfft; - uint32_t i; - uint32_t L2 = S->fftLenReal >> 1; - - /* Calculation of RIFFT of input */ - if (S->ifftFlagR == 1U) - { - /* Real IFFT core process */ - arm_split_rifft_q31(pSrc, L2, S->pTwiddleAReal, - S->pTwiddleBReal, pDst, S->twidCoefRModifier); - - /* Complex IFFT process */ - arm_cfft_q31(S_CFFT, pDst, S->ifftFlagR, S->bitReverseFlagR); - - for(i=0;ifftLenReal;i++) - { - pDst[i] = pDst[i] << 1; - } - } - else - { - /* Calculation of RFFT of input */ - - /* Complex FFT process */ - arm_cfft_q31(S_CFFT, pSrc, S->ifftFlagR, S->bitReverseFlagR); - - /* Real FFT core process */ - arm_split_rfft_q31(pSrc, L2, S->pTwiddleAReal, - S->pTwiddleBReal, pDst, S->twidCoefRModifier); - } + const arm_cfft_instance_q31 *S_CFFT = S->pCfft; + uint32_t L2 = S->fftLenReal >> 1U; + uint32_t i; + + /* Calculation of RIFFT of input */ + if (S->ifftFlagR == 1U) + { + /* Real IFFT core process */ + arm_split_rifft_q31 (pSrc, L2, S->pTwiddleAReal, S->pTwiddleBReal, pDst, S->twidCoefRModifier); + + /* Complex IFFT process */ + arm_cfft_q31 (S_CFFT, pDst, S->ifftFlagR, S->bitReverseFlagR); + + for(i = 0; i < S->fftLenReal; i++) + { + pDst[i] = pDst[i] << 1U; + } + } + else + { + /* Calculation of RFFT of input */ + + /* Complex FFT process */ + arm_cfft_q31 (S_CFFT, pSrc, S->ifftFlagR, S->bitReverseFlagR); + + /* Real FFT core process */ + arm_split_rfft_q31 (pSrc, L2, S->pTwiddleAReal, S->pTwiddleBReal, pDst, S->twidCoefRModifier); + } + } /** -* @} end of RealFFT group -*/ + @} 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. -*/ + @brief Core Real FFT process + @param[in] pSrc points to input buffer + @param[in] fftLen length of FFT + @param[in] pATable points to twiddle Coef A buffer + @param[in] pBTable points to twiddle Coef B buffer + @param[out] pDst points to 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_q31( - q31_t * pSrc, - uint32_t fftLen, - q31_t * pATable, - q31_t * pBTable, - q31_t * pDst, - uint32_t modifier) + q31_t * pSrc, + uint32_t fftLen, + const q31_t * pATable, + const q31_t * pBTable, + q31_t * pDst, + uint32_t modifier) { - uint32_t i; /* Loop Counter */ - q31_t outR, outI; /* Temporary variables for output */ - q31_t *pCoefA, *pCoefB; /* Temporary pointers for twiddle factors */ - q31_t CoefA1, CoefA2, CoefB1; /* Temporary variables for twiddle coefficients */ - q31_t *pOut1 = &pDst[2], *pOut2 = &pDst[(4U * fftLen) - 1U]; - q31_t *pIn1 = &pSrc[2], *pIn2 = &pSrc[(2U * fftLen) - 1U]; + uint32_t i; /* Loop Counter */ + q31_t outR, outI; /* Temporary variables for output */ + const q31_t *pCoefA, *pCoefB; /* Temporary pointers for twiddle factors */ + q31_t CoefA1, CoefA2, CoefB1; /* Temporary variables for twiddle coefficients */ + q31_t *pOut1 = &pDst[2], *pOut2 = &pDst[4 * fftLen - 1]; + q31_t *pIn1 = &pSrc[2], *pIn2 = &pSrc[2 * fftLen - 1]; - /* Init coefficient pointers */ - pCoefA = &pATable[modifier * 2U]; - pCoefB = &pBTable[modifier * 2U]; + /* Init coefficient pointers */ + pCoefA = &pATable[modifier * 2]; + pCoefB = &pBTable[modifier * 2]; - i = fftLen - 1U; + 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]); - */ + 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]); */ + 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; + CoefA1 = *pCoefA++; + CoefA2 = *pCoefA; - /* outR = (pSrc[2 * i] * pATable[2 * i] */ - mult_32x32_keep32_R(outR, *pIn1, CoefA1); + /* outR = (pSrc[2 * i] * pATable[2 * i] */ + mult_32x32_keep32_R (outR, *pIn1, CoefA1); - /* outI = pIn[2 * i] * pATable[2 * i + 1] */ - mult_32x32_keep32_R(outI, *pIn1++, CoefA2); + /* outI = pIn[2 * i] * pATable[2 * i + 1] */ + mult_32x32_keep32_R (outI, *pIn1++, CoefA2); - /* - pSrc[2 * i + 1] * pATable[2 * i + 1] */ - multSub_32x32_keep32_R(outR, *pIn1, CoefA2); + /* - pSrc[2 * i + 1] * pATable[2 * i + 1] */ + multSub_32x32_keep32_R (outR, *pIn1, CoefA2); - /* (pIn[2 * i + 1] * pATable[2 * i] */ - multAcc_32x32_keep32_R(outI, *pIn1++, CoefA1); + /* (pIn[2 * i + 1] * pATable[2 * i] */ + multAcc_32x32_keep32_R (outI, *pIn1++, CoefA1); - /* pSrc[2 * n - 2 * i] * pBTable[2 * i] */ - multSub_32x32_keep32_R(outR, *pIn2, CoefA2); - CoefB1 = *pCoefB; + /* pSrc[2 * n - 2 * i] * pBTable[2 * i] */ + multSub_32x32_keep32_R (outR, *pIn2, CoefA2); + CoefB1 = *pCoefB; - /* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] */ - multSub_32x32_keep32_R(outI, *pIn2--, CoefB1); + /* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] */ + multSub_32x32_keep32_R (outI, *pIn2--, CoefB1); - /* pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1] */ - multAcc_32x32_keep32_R(outR, *pIn2, CoefB1); + /* pSrc[2 * n - 2 * i + 1] * pBTable[2 * i + 1] */ + multAcc_32x32_keep32_R (outR, *pIn2, CoefB1); - /* pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */ - multSub_32x32_keep32_R(outI, *pIn2--, CoefA2); + /* pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */ + multSub_32x32_keep32_R (outI, *pIn2--, CoefA2); - /* write output */ - *pOut1++ = outR; - *pOut1++ = outI; + /* write output */ + *pOut1++ = outR; + *pOut1++ = outI; - /* write complex conjugate output */ - *pOut2-- = -outI; - *pOut2-- = outR; + /* write complex conjugate output */ + *pOut2-- = -outI; + *pOut2-- = outR; - /* update coefficient pointer */ - pCoefB = pCoefB + (modifier * 2U); - pCoefA = pCoefA + ((modifier * 2U) - 1U); + /* update coefficient pointer */ + pCoefB = pCoefB + (2 * modifier); + pCoefA = pCoefA + (2 * modifier - 1); - i--; - } - pDst[2U * fftLen] = (pSrc[0] - pSrc[1]) >> 1; - pDst[(2U * fftLen) + 1U] = 0; - - pDst[0] = (pSrc[0] + pSrc[1]) >> 1; - pDst[1] = 0; -} - -/** -* @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_q31( - q31_t * pSrc, - uint32_t fftLen, - q31_t * pATable, - q31_t * pBTable, - q31_t * pDst, - uint32_t modifier) -{ - q31_t outR, outI; /* Temporary variables for output */ - q31_t *pCoefA, *pCoefB; /* Temporary pointers for twiddle factors */ - q31_t CoefA1, CoefA2, CoefB1; /* Temporary variables for twiddle coefficients */ - q31_t *pIn1 = &pSrc[0], *pIn2 = &pSrc[(2U * fftLen) + 1U]; + /* Decrement loop count */ + i--; + } - pCoefA = &pATable[0]; - pCoefB = &pBTable[0]; + pDst[2 * fftLen] = (pSrc[0] - pSrc[1]) >> 1U; + pDst[2 * fftLen + 1] = 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 = (pIn[2 * i] * pATable[2 * i] */ - mult_32x32_keep32_R(outR, *pIn1, CoefA1); - - /* - pIn[2 * i] * pATable[2 * i + 1] */ - mult_32x32_keep32_R(outI, *pIn1++, -CoefA2); - - /* pIn[2 * i + 1] * pATable[2 * i + 1] */ - multAcc_32x32_keep32_R(outR, *pIn1, CoefA2); - - /* pIn[2 * i + 1] * pATable[2 * i] */ - multAcc_32x32_keep32_R(outI, *pIn1++, CoefA1); - - /* pIn[2 * n - 2 * i] * pBTable[2 * i] */ - multAcc_32x32_keep32_R(outR, *pIn2, CoefA2); - CoefB1 = *pCoefB; - - /* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] */ - multSub_32x32_keep32_R(outI, *pIn2--, CoefB1); - - /* pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1] */ - multAcc_32x32_keep32_R(outR, *pIn2, CoefB1); + pDst[0] = (pSrc[0] + pSrc[1]) >> 1U; + pDst[1] = 0; +} - /* pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */ - multAcc_32x32_keep32_R(outI, *pIn2--, CoefA2); - /* write output */ - *pDst++ = outR; - *pDst++ = outI; +/** + @brief Core Real IFFT process + @param[in] pSrc points to input buffer + @param[in] fftLen length of FFT + @param[in] pATable points to twiddle Coef A buffer + @param[in] pBTable points to twiddle Coef B buffer + @param[out] pDst points to output buffer + @param[in] modifier twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table + @return none + */ - /* update coefficient pointer */ - pCoefB = pCoefB + (modifier * 2U); - pCoefA = pCoefA + ((modifier * 2U) - 1U); +void arm_split_rifft_q31( + q31_t * pSrc, + uint32_t fftLen, + const q31_t * pATable, + const q31_t * pBTable, + q31_t * pDst, + uint32_t modifier) +{ + q31_t outR, outI; /* Temporary variables for output */ + const q31_t *pCoefA, *pCoefB; /* Temporary pointers for twiddle factors */ + q31_t CoefA1, CoefA2, CoefB1; /* Temporary variables for twiddle coefficients */ + q31_t *pIn1 = &pSrc[0], *pIn2 = &pSrc[2 * fftLen + 1]; + + 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 = (pIn[2 * i] * pATable[2 * i] */ + mult_32x32_keep32_R (outR, *pIn1, CoefA1); + + /* - pIn[2 * i] * pATable[2 * i + 1] */ + mult_32x32_keep32_R (outI, *pIn1++, -CoefA2); + + /* pIn[2 * i + 1] * pATable[2 * i + 1] */ + multAcc_32x32_keep32_R (outR, *pIn1, CoefA2); + + /* pIn[2 * i + 1] * pATable[2 * i] */ + multAcc_32x32_keep32_R (outI, *pIn1++, CoefA1); + + /* pIn[2 * n - 2 * i] * pBTable[2 * i] */ + multAcc_32x32_keep32_R (outR, *pIn2, CoefA2); + CoefB1 = *pCoefB; + + /* pIn[2 * n - 2 * i] * pBTable[2 * i + 1] */ + multSub_32x32_keep32_R (outI, *pIn2--, CoefB1); + + /* pIn[2 * n - 2 * i + 1] * pBTable[2 * i + 1] */ + multAcc_32x32_keep32_R (outR, *pIn2, CoefB1); + + /* pIn[2 * n - 2 * i + 1] * pBTable[2 * i] */ + multAcc_32x32_keep32_R (outI, *pIn2--, CoefA2); + + /* write output */ + *pDst++ = outR; + *pDst++ = outI; + + /* update coefficient pointer */ + pCoefB = pCoefB + (modifier * 2); + pCoefA = pCoefA + (modifier * 2 - 1); + + /* Decrement loop count */ + fftLen--; + } - /* Decrement loop count */ - fftLen--; - } } -- cgit