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

---
 .../ComplexMathFunctions/arm_cmplx_conj_f32.c      | 161 +++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c

(limited to 'Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c')

diff --git a/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c b/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c
new file mode 100644
index 0000000..ae20bbb
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c
@@ -0,0 +1,161 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cmplx_conj_f32.c
+ * Description:  Floating-point complex conjugate
+ *
+ * $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"
+
+/**
+  @ingroup groupCmplxMath
+ */
+
+/**
+  @defgroup cmplx_conj Complex Conjugate
+
+  Conjugates the elements of a complex data vector.
+
+  The <code>pSrc</code> points to the source data and
+  <code>pDst</code> points to the destination data where the result should be written.
+  <code>numSamples</code> specifies the number of complex samples
+  and the data in each array is stored in an interleaved fashion
+  (real, imag, real, imag, ...).
+  Each array has a total of <code>2*numSamples</code> values.
+
+  The underlying algorithm is used:
+  <pre>
+  for (n = 0; n < numSamples; n++) {
+      pDst[(2*n)  ] =  pSrc[(2*n)  ];    // real part
+      pDst[(2*n)+1] = -pSrc[(2*n)+1];    // imag part
+  }
+  </pre>
+
+  There are separate functions for floating-point, Q15, and Q31 data types.
+ */
+
+/**
+  @addtogroup cmplx_conj
+  @{
+ */
+
+/**
+  @brief         Floating-point complex conjugate.
+  @param[in]     pSrc        points to the input vector
+  @param[out]    pDst        points to the output vector
+  @param[in]     numSamples  number of samples in each vector
+  @return        none
+ */
+
+
+void arm_cmplx_conj_f32(
+  const float32_t * pSrc,
+        float32_t * pDst,
+        uint32_t numSamples)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+
+#if defined(ARM_MATH_NEON)
+   float32x4_t zero;
+   float32x4x2_t vec;
+
+   zero = vdupq_n_f32(0.0);
+
+   /* Compute 4 outputs at a time */
+   blkCnt = numSamples >> 2U;
+
+   while (blkCnt > 0U)
+   {
+     /* C[0]+jC[1] = A[0]+(-1)*jA[1] */
+     /* Calculate Complex Conjugate and then store the results in the destination buffer. */
+     vec = vld2q_f32(pSrc);
+     vec.val[1] = vsubq_f32(zero,vec.val[1]);
+     vst2q_f32(pDst,vec);
+
+     /* Increment pointers */
+     pSrc += 8;
+     pDst += 8;
+        
+     /* Decrement the loop counter */
+     blkCnt--;
+   }
+
+   /* Tail */
+   blkCnt = numSamples & 0x3;
+
+#else
+#if defined (ARM_MATH_LOOPUNROLL)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = numSamples >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C[0] + jC[1] = A[0]+ j(-1)A[1] */
+
+    /* Calculate Complex Conjugate and store result in destination buffer. */
+    *pDst++ =  *pSrc++;
+    *pDst++ = -*pSrc++;
+
+    *pDst++ =  *pSrc++;
+    *pDst++ = -*pSrc++;
+
+    *pDst++ =  *pSrc++;
+    *pDst++ = -*pSrc++;
+
+    *pDst++ =  *pSrc++;
+    *pDst++ = -*pSrc++;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = numSamples % 0x4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = numSamples;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+#endif /* #if defined (ARM_MATH_NEON) */
+
+  while (blkCnt > 0U)
+  {
+    /* C[0] + jC[1] = A[0]+ j(-1)A[1] */
+
+    /* Calculate Complex Conjugate and store result in destination buffer. */
+    *pDst++ =  *pSrc++;
+    *pDst++ = -*pSrc++;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+
+/**
+  @} end of cmplx_conj group
+ */
-- 
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