diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_radix2_init_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_radix2_init_f32.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_radix2_init_f32.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_radix2_init_f32.c new file mode 100644 index 0000000..4a11840 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_radix2_init_f32.c @@ -0,0 +1,197 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_cfft_radix2_init_f32.c
+ * Description: Radix-2 Decimation in Frequency Floating-point CFFT & CIFFT Initialization 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"
+#include "arm_common_tables.h"
+
+/**
+ @ingroup groupTransforms
+ */
+
+/**
+ @addtogroup ComplexFFT
+ @{
+ */
+
+/**
+ @brief Initialization function for the floating-point CFFT/CIFFT.
+ @deprecated Do not use this function. It has been superseded by \ref arm_cfft_f32 and will be removed in the future.
+ @param[in,out] S points to an instance of the floating-point CFFT/CIFFT structure
+ @param[in] fftLen length of the FFT
+ @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 execution status
+ - \ref ARM_MATH_SUCCESS : Operation successful
+ - \ref ARM_MATH_ARGUMENT_ERROR : <code>fftLen</code> is not a supported length
+
+ @par Details
+ The parameter <code>ifftFlag</code> controls whether a forward or inverse transform is computed.
+ Set(=1) ifftFlag for calculation of CIFFT otherwise CFFT is calculated
+ @par
+ The parameter <code>bitReverseFlag</code> controls whether output is in normal order or bit reversed order.
+ Set(=1) bitReverseFlag for output to be in normal order otherwise output is in bit reversed order.
+ @par
+ The parameter <code>fftLen</code> Specifies length of CFFT/CIFFT process. Supported FFT Lengths are 16, 64, 256, 1024.
+ @par
+ This Function also initializes Twiddle factor table pointer and Bit reversal table pointer.
+*/
+
+arm_status arm_cfft_radix2_init_f32(
+ arm_cfft_radix2_instance_f32 * S,
+ uint16_t fftLen,
+ uint8_t ifftFlag,
+ uint8_t bitReverseFlag)
+{
+ /* Initialise the default arm status */
+ arm_status status = ARM_MATH_SUCCESS;
+
+ /* Initialise the FFT length */
+ S->fftLen = fftLen;
+
+ /* Initialise the Twiddle coefficient pointer */
+ S->pTwiddle = (float32_t *) twiddleCoef;
+
+ /* Initialise the Flag for selection of CFFT or CIFFT */
+ S->ifftFlag = ifftFlag;
+
+ /* Initialise the Flag for calculation Bit reversal or not */
+ S->bitReverseFlag = bitReverseFlag;
+
+ /* Initializations of structure parameters depending on the FFT length */
+ switch (S->fftLen)
+ {
+
+ case 4096U:
+ /* Initializations of structure parameters for 4096 point FFT */
+
+ /* Initialise the twiddle coef modifier value */
+ S->twidCoefModifier = 1U;
+ /* Initialise the bit reversal table modifier */
+ S->bitRevFactor = 1U;
+ /* Initialise the bit reversal table pointer */
+ S->pBitRevTable = (uint16_t *) armBitRevTable;
+ /* Initialise the 1/fftLen Value */
+ S->onebyfftLen = 0.000244140625;
+ break;
+
+ case 2048U:
+ /* Initializations of structure parameters for 2048 point FFT */
+
+ /* Initialise the twiddle coef modifier value */
+ S->twidCoefModifier = 2U;
+ /* Initialise the bit reversal table modifier */
+ S->bitRevFactor = 2U;
+ /* Initialise the bit reversal table pointer */
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[1];
+ /* Initialise the 1/fftLen Value */
+ S->onebyfftLen = 0.00048828125;
+ break;
+
+ case 1024U:
+ /* Initializations of structure parameters for 1024 point FFT */
+
+ /* Initialise the twiddle coef modifier value */
+ S->twidCoefModifier = 4U;
+ /* Initialise the bit reversal table modifier */
+ S->bitRevFactor = 4U;
+ /* Initialise the bit reversal table pointer */
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[3];
+ /* Initialise the 1/fftLen Value */
+ S->onebyfftLen = 0.0009765625f;
+ break;
+
+ case 512U:
+ /* Initializations of structure parameters for 512 point FFT */
+
+ /* Initialise the twiddle coef modifier value */
+ S->twidCoefModifier = 8U;
+ /* Initialise the bit reversal table modifier */
+ S->bitRevFactor = 8U;
+ /* Initialise the bit reversal table pointer */
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[7];
+ /* Initialise the 1/fftLen Value */
+ S->onebyfftLen = 0.001953125;
+ break;
+
+ case 256U:
+ /* Initializations of structure parameters for 256 point FFT */
+ S->twidCoefModifier = 16U;
+ S->bitRevFactor = 16U;
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[15];
+ S->onebyfftLen = 0.00390625f;
+ break;
+
+ case 128U:
+ /* Initializations of structure parameters for 128 point FFT */
+ S->twidCoefModifier = 32U;
+ S->bitRevFactor = 32U;
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[31];
+ S->onebyfftLen = 0.0078125;
+ break;
+
+ case 64U:
+ /* Initializations of structure parameters for 64 point FFT */
+ S->twidCoefModifier = 64U;
+ S->bitRevFactor = 64U;
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[63];
+ S->onebyfftLen = 0.015625f;
+ break;
+
+ case 32U:
+ /* Initializations of structure parameters for 64 point FFT */
+ S->twidCoefModifier = 128U;
+ S->bitRevFactor = 128U;
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[127];
+ S->onebyfftLen = 0.03125;
+ break;
+
+ case 16U:
+ /* Initializations of structure parameters for 16 point FFT */
+ S->twidCoefModifier = 256U;
+ S->bitRevFactor = 256U;
+ S->pBitRevTable = (uint16_t *) & armBitRevTable[255];
+ S->onebyfftLen = 0.0625f;
+ break;
+
+
+ default:
+ /* Reporting argument error if fftSize is not valid value */
+ status = ARM_MATH_ARGUMENT_ERROR;
+ break;
+ }
+
+ return (status);
+}
+
+/**
+ @} end of ComplexFFT group
+ */
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