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Diffstat (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q31.c')
-rw-r--r--Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q31.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q31.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q31.c
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+++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q31.c
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+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_cfft_q31.c
+ * Description: Combined Radix Decimation in Frequency CFFT fixed point processing 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"
+
+extern void arm_radix4_butterfly_q31(
+ q31_t * pSrc,
+ uint32_t fftLen,
+ const q31_t * pCoef,
+ uint32_t twidCoefModifier);
+
+extern void arm_radix4_butterfly_inverse_q31(
+ q31_t * pSrc,
+ uint32_t fftLen,
+ const q31_t * pCoef,
+ uint32_t twidCoefModifier);
+
+extern void arm_bitreversal_32(
+ uint32_t * pSrc,
+ const uint16_t bitRevLen,
+ const uint16_t * pBitRevTable);
+
+void arm_cfft_radix4by2_q31(
+ q31_t * pSrc,
+ uint32_t fftLen,
+ const q31_t * pCoef);
+
+void arm_cfft_radix4by2_inverse_q31(
+ q31_t * pSrc,
+ uint32_t fftLen,
+ const q31_t * pCoef);
+
+/**
+ @ingroup groupTransforms
+ */
+
+/**
+ @addtogroup ComplexFFT
+ @{
+ */
+
+/**
+ @brief Processing function for the Q31 complex FFT.
+ @param[in] S points to an instance of the fixed-point CFFT structure
+ @param[in,out] p1 points to the complex data buffer of size <code>2*fftLen</code>. Processing occurs in-place
+ @param[in] ifftFlag flag that selects transform direction
+ - value = 0: forward transform
+ - value = 1: inverse transform
+ @param[in] bitReverseFlag flag that enables / disables bit reversal of output
+ - value = 0: disables bit reversal of output
+ - value = 1: enables bit reversal of output
+ @return none
+ */
+
+void arm_cfft_q31(
+ const arm_cfft_instance_q31 * S,
+ q31_t * p1,
+ uint8_t ifftFlag,
+ uint8_t bitReverseFlag)
+{
+ uint32_t L = S->fftLen;
+
+ if (ifftFlag == 1U)
+ {
+ switch (L)
+ {
+ case 16:
+ case 64:
+ case 256:
+ case 1024:
+ case 4096:
+ arm_radix4_butterfly_inverse_q31 ( p1, L, (q31_t*)S->pTwiddle, 1 );
+ break;
+
+ case 32:
+ case 128:
+ case 512:
+ case 2048:
+ arm_cfft_radix4by2_inverse_q31 ( p1, L, S->pTwiddle );
+ break;
+ }
+ }
+ else
+ {
+ switch (L)
+ {
+ case 16:
+ case 64:
+ case 256:
+ case 1024:
+ case 4096:
+ arm_radix4_butterfly_q31 ( p1, L, (q31_t*)S->pTwiddle, 1 );
+ break;
+
+ case 32:
+ case 128:
+ case 512:
+ case 2048:
+ arm_cfft_radix4by2_q31 ( p1, L, S->pTwiddle );
+ break;
+ }
+ }
+
+ if ( bitReverseFlag )
+ arm_bitreversal_32 ((uint32_t*) p1, S->bitRevLength, S->pBitRevTable);
+}
+
+/**
+ @} end of ComplexFFT group
+ */
+
+void arm_cfft_radix4by2_q31(
+ q31_t * pSrc,
+ uint32_t fftLen,
+ const q31_t * pCoef)
+{
+ uint32_t i, l;
+ uint32_t n2;
+ q31_t xt, yt, cosVal, sinVal;
+ q31_t p0, p1;
+
+ n2 = fftLen >> 1U;
+ for (i = 0; i < n2; i++)
+ {
+ cosVal = pCoef[2 * i];
+ sinVal = pCoef[2 * i + 1];
+
+ l = i + n2;
+
+ xt = (pSrc[2 * i] >> 2U) - (pSrc[2 * l] >> 2U);
+ pSrc[2 * i] = (pSrc[2 * i] >> 2U) + (pSrc[2 * l] >> 2U);
+
+ yt = (pSrc[2 * i + 1] >> 2U) - (pSrc[2 * l + 1] >> 2U);
+ pSrc[2 * i + 1] = (pSrc[2 * l + 1] >> 2U) + (pSrc[2 * i + 1] >> 2U);
+
+ mult_32x32_keep32_R(p0, xt, cosVal);
+ mult_32x32_keep32_R(p1, yt, cosVal);
+ multAcc_32x32_keep32_R(p0, yt, sinVal);
+ multSub_32x32_keep32_R(p1, xt, sinVal);
+
+ pSrc[2 * l] = p0 << 1;
+ pSrc[2 * l + 1] = p1 << 1;
+ }
+
+ /* first col */
+ arm_radix4_butterfly_q31 (pSrc, n2, (q31_t*)pCoef, 2U);
+
+ /* second col */
+ arm_radix4_butterfly_q31 (pSrc + fftLen, n2, (q31_t*)pCoef, 2U);
+
+ n2 = fftLen >> 1U;
+ for (i = 0; i < n2; i++)
+ {
+ p0 = pSrc[4 * i + 0];
+ p1 = pSrc[4 * i + 1];
+ xt = pSrc[4 * i + 2];
+ yt = pSrc[4 * i + 3];
+
+ p0 <<= 1U;
+ p1 <<= 1U;
+ xt <<= 1U;
+ yt <<= 1U;
+
+ pSrc[4 * i + 0] = p0;
+ pSrc[4 * i + 1] = p1;
+ pSrc[4 * i + 2] = xt;
+ pSrc[4 * i + 3] = yt;
+ }
+
+}
+
+void arm_cfft_radix4by2_inverse_q31(
+ q31_t * pSrc,
+ uint32_t fftLen,
+ const q31_t * pCoef)
+{
+ uint32_t i, l;
+ uint32_t n2;
+ q31_t xt, yt, cosVal, sinVal;
+ q31_t p0, p1;
+
+ n2 = fftLen >> 1U;
+ for (i = 0; i < n2; i++)
+ {
+ cosVal = pCoef[2 * i];
+ sinVal = pCoef[2 * i + 1];
+
+ l = i + n2;
+
+ xt = (pSrc[2 * i] >> 2U) - (pSrc[2 * l] >> 2U);
+ pSrc[2 * i] = (pSrc[2 * i] >> 2U) + (pSrc[2 * l] >> 2U);
+
+ yt = (pSrc[2 * i + 1] >> 2U) - (pSrc[2 * l + 1] >> 2U);
+ pSrc[2 * i + 1] = (pSrc[2 * l + 1] >> 2U) + (pSrc[2 * i + 1] >> 2U);
+
+ mult_32x32_keep32_R(p0, xt, cosVal);
+ mult_32x32_keep32_R(p1, yt, cosVal);
+ multSub_32x32_keep32_R(p0, yt, sinVal);
+ multAcc_32x32_keep32_R(p1, xt, sinVal);
+
+ pSrc[2 * l] = p0 << 1U;
+ pSrc[2 * l + 1] = p1 << 1U;
+ }
+
+ /* first col */
+ arm_radix4_butterfly_inverse_q31( pSrc, n2, (q31_t*)pCoef, 2U);
+
+ /* second col */
+ arm_radix4_butterfly_inverse_q31( pSrc + fftLen, n2, (q31_t*)pCoef, 2U);
+
+ n2 = fftLen >> 1U;
+ for (i = 0; i < n2; i++)
+ {
+ p0 = pSrc[4 * i + 0];
+ p1 = pSrc[4 * i + 1];
+ xt = pSrc[4 * i + 2];
+ yt = pSrc[4 * i + 3];
+
+ p0 <<= 1U;
+ p1 <<= 1U;
+ xt <<= 1U;
+ yt <<= 1U;
+
+ pSrc[4 * i + 0] = p0;
+ pSrc[4 * i + 1] = p1;
+ pSrc[4 * i + 2] = xt;
+ pSrc[4 * i + 3] = yt;
+ }
+}
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