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

---
 .../DSP/Source/BasicMathFunctions/arm_scale_f32.c  | 159 +++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f32.c

(limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f32.c')

diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f32.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f32.c
new file mode 100644
index 0000000..38327cc
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f32.c
@@ -0,0 +1,159 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_scale_f32.c
+ * Description:  Multiplies a floating-point vector by a scalar
+ *
+ * $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 groupMath
+ */
+
+/**
+  @defgroup BasicScale Vector Scale
+
+  Multiply a vector by a scalar value.  For floating-point data, the algorithm used is:
+
+  <pre>
+      pDst[n] = pSrc[n] * scale,   0 <= n < blockSize.
+  </pre>
+
+  In the fixed-point Q7, Q15, and Q31 functions, <code>scale</code> is represented by
+  a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>.
+  The shift allows the gain of the scaling operation to exceed 1.0.
+  The algorithm used with fixed-point data is:
+
+  <pre>
+      pDst[n] = (pSrc[n] * scaleFract) << shift,   0 <= n < blockSize.
+  </pre>
+
+  The overall scale factor applied to the fixed-point data is
+  <pre>
+      scale = scaleFract * 2^shift.
+  </pre>
+
+  The functions support in-place computation allowing the source and destination
+  pointers to reference the same memory buffer.
+ */
+
+/**
+  @addtogroup BasicScale
+  @{
+ */
+
+/**
+  @brief         Multiplies a floating-point vector by a scalar.
+  @param[in]     pSrc       points to the input vector
+  @param[in]     scale      scale factor to be applied
+  @param[out]    pDst       points to the output vector
+  @param[in]     blockSize  number of samples in each vector
+  @return        none
+ */
+
+void arm_scale_f32(
+  const float32_t *pSrc,
+        float32_t scale,
+        float32_t *pDst,
+        uint32_t blockSize)
+{
+  uint32_t blkCnt;                               /* Loop counter */
+#if defined(ARM_MATH_NEON_EXPERIMENTAL)
+    float32x4_t vec1;
+    float32x4_t res;
+
+    /* Compute 4 outputs at a time */
+    blkCnt = blockSize >> 2U;
+
+    while (blkCnt > 0U)
+    {
+        /* C = A * scale */
+
+    	/* Scale the input and then store the results in the destination buffer. */
+        vec1 = vld1q_f32(pSrc);
+        res = vmulq_f32(vec1, vdupq_n_f32(scale));
+        vst1q_f32(pDst, res);
+
+        /* Increment pointers */
+        pSrc += 4; 
+        pDst += 4;
+        
+        /* Decrement the loop counter */
+        blkCnt--;
+    }
+
+    /* Tail */
+    blkCnt = blockSize & 0x3;
+
+#else
+#if defined (ARM_MATH_LOOPUNROLL)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C = A * scale */
+
+    /* Scale input and store result in destination buffer. */
+    *pDst++ = (*pSrc++) * scale;
+
+    *pDst++ = (*pSrc++) * scale;
+
+    *pDst++ = (*pSrc++) * scale;
+
+    *pDst++ = (*pSrc++) * scale;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = blockSize % 0x4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+#endif /* #if defined(ARM_MATH_NEON_EXPERIMENTAL) */
+
+  while (blkCnt > 0U)
+  {
+    /* C = A * scale */
+
+    /* Scale input and store result in destination buffer. */
+    *pDst++ = (*pSrc++) * scale;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+
+/**
+  @} end of BasicScale group
+ */
-- 
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