initial commitHEADmaster

1 files changed, 309 insertions, 0 deletions

diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_f32.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_f32.c
new file mode 100644
index 0000000..2ad336d
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_f32.c
@@ -0,0 +1,309 @@
+/* ----------------------------------------------------------------------

+ * Project:      CMSIS DSP Library

+ * Title:        arm_rfft_f32.c

+ * Description:  RFFT & RIFFT Floating point process function

+ *

+ * $Date:        18. March 2019

+ * $Revision:    V1.6.0

+ *

+ * Target Processor: Cortex-M cores

+ * -------------------------------------------------------------------- */

+/*

+ * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.

+ *

+ * SPDX-License-Identifier: Apache-2.0

+ *

+ * Licensed under the Apache License, Version 2.0 (the License); you may

+ * not use this file except in compliance with the License.

+ * You may obtain a copy of the License at

+ *

+ * www.apache.org/licenses/LICENSE-2.0

+ *

+ * Unless required by applicable law or agreed to in writing, software

+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT

+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+ * See the License for the specific language governing permissions and

+ * limitations under the License.

+ */

+

+#include "arm_math.h"

+

+/* ----------------------------------------------------------------------

+ * Internal functions prototypes

+ * -------------------------------------------------------------------- */

+

+extern void arm_radix4_butterfly_f32(

+        float32_t * pSrc,

+        uint16_t fftLen,

+  const float32_t * pCoef,

+        uint16_t twidCoefModifier);

+

+extern void arm_radix4_butterfly_inverse_f32(

+        float32_t * pSrc,

+        uint16_t fftLen,

+  const float32_t * pCoef,

+        uint16_t twidCoefModifier,

+        float32_t onebyfftLen);

+

+extern void arm_bitreversal_f32(

+        float32_t * pSrc,

+        uint16_t fftSize,

+        uint16_t bitRevFactor,

+  const uint16_t * pBitRevTab);

+

+void arm_split_rfft_f32(

+        float32_t * pSrc,

+        uint32_t fftLen,

+  const float32_t * pATable,

+  const float32_t * pBTable,

+        float32_t * pDst,

+        uint32_t modifier);

+

+void arm_split_rifft_f32(

+        float32_t * pSrc,

+        uint32_t fftLen,

+  const float32_t * pATable,

+  const float32_t * pBTable,

+        float32_t * pDst,

+        uint32_t modifier);

+

+/**

+  @ingroup groupTransforms

+ */

+

+/**

+  @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 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_f32(

+        float32_t * pSrc,

+        uint32_t fftLen,

+  const float32_t * pATable,

+  const float32_t * pBTable,

+        float32_t * pDst,

+        uint32_t modifier)

+{

+        uint32_t i;                                    /* Loop Counter */

+        float32_t outR, outI;                          /* Temporary variables for output */

+  const 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 * 2];

+  pCoefB = &pBTable[modifier * 2];

+

+  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 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_rifft_f32(

+        float32_t * pSrc,

+        uint32_t fftLen,

+  const float32_t * pATable,

+  const float32_t * pBTable,

+        float32_t * pDst,

+        uint32_t modifier)

+{

+        float32_t outR, outI;                          /* Temporary variables for output */

+  const 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 * 2);

+     pCoefA = pCoefA + (modifier * 2 - 1);

+

+     /* Decrement loop count */

+     fftLen--;

+  }

+

+}