From 86608c6770cf08c138a2bdab5855072f64be09ef Mon Sep 17 00:00:00 2001
From: joshua <joshua@joshuayun.com>
Date: Sat, 30 Dec 2023 23:54:31 -0500
Subject: initial commit

---
 .../Source/TransformFunctions/arm_rfft_init_f32.c  | 139 +++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_f32.c

(limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_f32.c')

diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_f32.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_f32.c
new file mode 100644
index 0000000..3d57a21
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_f32.c
@@ -0,0 +1,139 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_rfft_init_f32.c
+ * Description:  RFFT & RIFFT Floating point 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"
+
+
+/**
+  @addtogroup RealFFT
+  @{
+ */
+
+/**
+  @brief         Initialization function for the floating-point RFFT/RIFFT.
+  @deprecated    Do not use this function. It has been superceded by \ref arm_rfft_fast_init_f32 and will be removed in the future.
+  @param[in,out] S             points to an instance of the floating-point RFFT/RIFFT structure
+  @param[in,out] S_CFFT        points to an instance of the floating-point CFFT/CIFFT 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 : <code>fftLenReal</code> is not a supported length
+
+  @par Description
+                   The parameter <code>fftLenReal</code>specifies length of RFFT/RIFFT Process.
+                   Supported FFT Lengths are 128, 512, 2048.
+  @par
+                   The parameter <code>ifftFlagR</code> controls whether a forward or inverse transform is computed.
+                   Set(=1) ifftFlagR to calculate RIFFT, otherwise RFFT 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
+                   This function also initializes Twiddle factor table.
+ */
+
+arm_status arm_rfft_init_f32(
+  arm_rfft_instance_f32 * S,
+  arm_cfft_radix4_instance_f32 * S_CFFT,
+  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 Complex FFT length */
+  S->fftLenBy2 = (uint16_t) fftLenReal / 2U;
+
+  /*  Initialize the Twiddle coefficientA pointer */
+  S->pTwiddleAReal = (float32_t *) realCoefA;
+
+  /*  Initialize the Twiddle coefficientB pointer */
+  S->pTwiddleBReal = (float32_t *) realCoefB;
+
+  /*  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;
+
+  /*  Initializations of structure parameters depending on the FFT length */
+  switch (S->fftLenReal)
+  {
+    /* Init table modifier value */
+  case 8192U:
+    S->twidCoefRModifier = 1U;
+    break;
+  case 2048U:
+    S->twidCoefRModifier = 4U;
+    break;
+  case 512U:
+    S->twidCoefRModifier = 16U;
+    break;
+  case 128U:
+    S->twidCoefRModifier = 64U;
+    break;
+  default:
+    /*  Reporting argument error if rfftSize is not valid value */
+    status = ARM_MATH_ARGUMENT_ERROR;
+    break;
+  }
+
+  /* Init Complex FFT Instance */
+  S->pCfft = S_CFFT;
+
+  if (S->ifftFlagR)
+  {
+    /* Initializes the CIFFT Module for fftLenreal/2 length */
+    arm_cfft_radix4_init_f32(S->pCfft, S->fftLenBy2, 1U, 0U);
+  }
+  else
+  {
+    /* Initializes the CFFT Module for fftLenreal/2 length */
+    arm_cfft_radix4_init_f32(S->pCfft, S->fftLenBy2, 0U, 0U);
+  }
+
+  /* return the status of RFFT Init function */
+  return (status);
+
+}
+
+/**
+  @} end of RealFFT group
+ */
-- 
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