diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q15.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q15.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q15.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q15.c new file mode 100644 index 0000000..fb4c66c --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_rfft_init_q15.c @@ -0,0 +1,158 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_rfft_init_q15.c
+ * Description: RFFT & RIFFT Q15 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 Q15 RFFT/RIFFT.
+ @param[in,out] S points to an instance of the Q15 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 : <code>fftLenReal</code> is not a supported length
+
+ @par Details
+ The parameter <code>fftLenReal</code> specifies length of RFFT/RIFFT Process.
+ Supported FFT Lengths are 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192.
+ @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_q15(
+ arm_rfft_instance_q15 * 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 = (q15_t *) realCoefAQ15;
+
+ /* Initialize the Twiddle coefficientB pointer */
+ S->pTwiddleBReal = (q15_t *) realCoefBQ15;
+
+ /* 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_Q15_4096) && defined(ARM_TABLE_BITREVIDX_FXT_4096))
+ case 8192U:
+ S->twidCoefRModifier = 1U;
+ S->pCfft = &arm_cfft_sR_q15_len4096;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_2048) && defined(ARM_TABLE_BITREVIDX_FXT_2048))
+ case 4096U:
+ S->twidCoefRModifier = 2U;
+ S->pCfft = &arm_cfft_sR_q15_len2048;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_1024) && defined(ARM_TABLE_BITREVIDX_FXT_1024))
+ case 2048U:
+ S->twidCoefRModifier = 4U;
+ S->pCfft = &arm_cfft_sR_q15_len1024;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_512) && defined(ARM_TABLE_BITREVIDX_FXT_512))
+ case 1024U:
+ S->twidCoefRModifier = 8U;
+ S->pCfft = &arm_cfft_sR_q15_len512;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_256) && defined(ARM_TABLE_BITREVIDX_FXT_256))
+ case 512U:
+ S->twidCoefRModifier = 16U;
+ S->pCfft = &arm_cfft_sR_q15_len256;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_128) && defined(ARM_TABLE_BITREVIDX_FXT_128))
+ case 256U:
+ S->twidCoefRModifier = 32U;
+ S->pCfft = &arm_cfft_sR_q15_len128;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_64) && defined(ARM_TABLE_BITREVIDX_FXT_64))
+ case 128U:
+ S->twidCoefRModifier = 64U;
+ S->pCfft = &arm_cfft_sR_q15_len64;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_32) && defined(ARM_TABLE_BITREVIDX_FXT_32))
+ case 64U:
+ S->twidCoefRModifier = 128U;
+ S->pCfft = &arm_cfft_sR_q15_len32;
+ break;
+#endif
+#if !defined(ARM_DSP_CONFIG_TABLES) || defined(ARM_ALL_FFT_TABLES) || (defined(ARM_TABLE_TWIDDLECOEF_Q15_16) && defined(ARM_TABLE_BITREVIDX_FXT_16))
+ case 32U:
+ S->twidCoefRModifier = 256U;
+ S->pCfft = &arm_cfft_sR_q15_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
+ */
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