From 86608c6770cf08c138a2bdab5855072f64be09ef Mon Sep 17 00:00:00 2001 From: joshua Date: Sat, 30 Dec 2023 23:54:31 -0500 Subject: initial commit --- .../Source/TransformFunctions/arm_rfft_init_q31.c | 160 +++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100644 Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q31.c (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q31.c') diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q31.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q31.c new file mode 100644 index 0000000..efae1ea --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q31.c @@ -0,0 +1,160 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_rfft_init_q31.c + * Description: RFFT & RIFFT Q31 initialisation 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" +#include "arm_const_structs.h" + + + +/** + @addtogroup RealFFT + @{ + */ + +/** + @brief Initialization function for the Q31 RFFT/RIFFT. + @param[in,out] S points to an instance of the Q31 RFFT/RIFFT structure + @param[in] fftLenReal length of the FFT + @param[in] ifftFlagR 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 : fftLenReal is not a supported length + + @par Details + The parameter fftLenReal specifies length of RFFT/RIFFT Process. + Supported FFT Lengths are 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192. + @par + The parameter ifftFlagR controls whether a forward or inverse transform is computed. + Set(=1) ifftFlagR to calculate RIFFT, otherwise RFFT is calculated. + @par + The parameter bitReverseFlag 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 + This function also initializes Twiddle factor table. +*/ + +arm_status arm_rfft_init_q31( + arm_rfft_instance_q31 * S, + uint32_t fftLenReal, + uint32_t ifftFlagR, + uint32_t bitReverseFlag) +{ + /* Initialise the default arm status */ + arm_status status = ARM_MATH_SUCCESS; + + /* Initialize the Real FFT length */ + S->fftLenReal = (uint16_t) fftLenReal; + + /* Initialize the Twiddle coefficientA pointer */ + S->pTwiddleAReal = (q31_t *) realCoefAQ31; + + /* Initialize the Twiddle coefficientB pointer */ + S->pTwiddleBReal = (q31_t *) realCoefBQ31; + + /* Initialize the Flag for selection of RFFT or RIFFT */ + S->ifftFlagR = (uint8_t) ifftFlagR; + + /* Initialize the Flag for calculation Bit reversal or not */ + S->bitReverseFlagR = (uint8_t) bitReverseFlag; + + /* Initialization of coef modifier depending on the FFT length */ + switch (S->fftLenReal) + { +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_4096) && defined(ARM_TABLE_BITREVIDX_FXT_4096)) + case 8192U: + S->twidCoefRModifier = 1U; + S->pCfft = &arm_cfft_sR_q31_len4096; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_2048) && defined(ARM_TABLE_BITREVIDX_FXT_2048)) + case 4096U: + S->twidCoefRModifier = 2U; + S->pCfft = &arm_cfft_sR_q31_len2048; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_1024) && defined(ARM_TABLE_BITREVIDX_FXT_1024)) + case 2048U: + S->twidCoefRModifier = 4U; + S->pCfft = &arm_cfft_sR_q31_len1024; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_512) && defined(ARM_TABLE_BITREVIDX_FXT_512)) + case 1024U: + S->twidCoefRModifier = 8U; + S->pCfft = &arm_cfft_sR_q31_len512; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_256) && defined(ARM_TABLE_BITREVIDX_FXT_256)) + case 512U: + S->twidCoefRModifier = 16U; + S->pCfft = &arm_cfft_sR_q31_len256; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_128) && defined(ARM_TABLE_BITREVIDX_FXT_128)) + case 256U: + S->twidCoefRModifier = 32U; + S->pCfft = &arm_cfft_sR_q31_len128; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_64) && defined(ARM_TABLE_BITREVIDX_FXT_64)) + case 128U: + S->twidCoefRModifier = 64U; + S->pCfft = &arm_cfft_sR_q31_len64; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_32) && defined(ARM_TABLE_BITREVIDX_FXT_32)) + case 64U: + S->twidCoefRModifier = 128U; + S->pCfft = &arm_cfft_sR_q31_len32; + break; +#endif +#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q31_16) && defined(ARM_TABLE_BITREVIDX_FXT_16)) + case 32U: + S->twidCoefRModifier = 256U; + S->pCfft = &arm_cfft_sR_q31_len16; + break; +#endif + default: + /* Reporting argument error if rfftSize is not valid value */ + status = ARM_MATH_ARGUMENT_ERROR; + break; + } + + /* return the status of RFFT Init function */ + return (status); +} + +/** + @} end of RealFFT group + */ -- cgit v1.2.3