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| author | joshua <joshua@joshuayun.com> | 2023-12-30 23:54:31 -0500 |
|---|---|---|
| committer | joshua <joshua@joshuayun.com> | 2023-12-30 23:54:31 -0500 |
| commit | 86608c6770cf08c138a2bdab5855072f64be09ef (patch) | |
| tree | 494a61b3ef37e76f9235a0d10f5c93d97290a35f /Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c | |
| download | sdr-software-86608c6770cf08c138a2bdab5855072f64be09ef.tar.gz | |
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c new file mode 100644 index 0000000..29d5757 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal2.c @@ -0,0 +1,99 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_bitreversal2.c
+ * Description: Bitreversal functions
+ *
+ * $Date: 18. March 2019
+ * $Revision: V1.0.0
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 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"
+
+/**
+ @brief In-place 32 bit reversal function.
+ @param[in,out] pSrc points to in-place buffer of unknown 32-bit data type
+ @param[in] bitRevLen bit reversal table length
+ @param[in] pBitRevTab points to bit reversal table
+ @return none
+*/
+
+void arm_bitreversal_32(
+ uint32_t *pSrc,
+ const uint16_t bitRevLen,
+ const uint16_t *pBitRevTab)
+{
+ uint32_t a, b, i, tmp;
+
+ for (i = 0; i < bitRevLen; )
+ {
+ a = pBitRevTab[i ] >> 2;
+ b = pBitRevTab[i + 1] >> 2;
+
+ //real
+ tmp = pSrc[a];
+ pSrc[a] = pSrc[b];
+ pSrc[b] = tmp;
+
+ //complex
+ tmp = pSrc[a+1];
+ pSrc[a+1] = pSrc[b+1];
+ pSrc[b+1] = tmp;
+
+ i += 2;
+ }
+}
+
+
+/**
+ @brief In-place 16 bit reversal function.
+ @param[in,out] pSrc points to in-place buffer of unknown 16-bit data type
+ @param[in] bitRevLen bit reversal table length
+ @param[in] pBitRevTab points to bit reversal table
+ @return none
+*/
+
+void arm_bitreversal_16(
+ uint16_t *pSrc,
+ const uint16_t bitRevLen,
+ const uint16_t *pBitRevTab)
+{
+ uint16_t a, b, i, tmp;
+
+ for (i = 0; i < bitRevLen; )
+ {
+ a = pBitRevTab[i ] >> 2;
+ b = pBitRevTab[i + 1] >> 2;
+
+ //real
+ tmp = pSrc[a];
+ pSrc[a] = pSrc[b];
+ pSrc[b] = tmp;
+
+ //complex
+ tmp = pSrc[a+1];
+ pSrc[a+1] = pSrc[b+1];
+ pSrc[b+1] = tmp;
+
+ i += 2;
+ }
+}
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