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/FastMathFunctions/arm_sin_f32.c     | 122 +++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_f32.c

(limited to 'Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_f32.c')

diff --git a/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_f32.c b/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_f32.c
new file mode 100644
index 0000000..674765e
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_f32.c
@@ -0,0 +1,122 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_sin_f32.c
+ * Description:  Fast sine calculation for floating-point values
+ *
+ * $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"
+
+/**
+  @ingroup groupFastMath
+ */
+
+/**
+  @defgroup sin Sine
+
+  Computes the trigonometric sine function using a combination of table lookup
+  and linear interpolation.  There are separate functions for
+  Q15, Q31, and floating-point data types.
+  The input to the floating-point version is in radians while the
+  fixed-point Q15 and Q31 have a scaled input with the range
+  [0 +0.9999] mapping to [0 2*pi).  The fixed-point range is chosen so that a
+  value of 2*pi wraps around to 0.
+
+  The implementation is based on table lookup using 256 values together with linear interpolation.
+  The steps used are:
+   -# Calculation of the nearest integer table index
+   -# Compute the fractional portion (fract) of the table index.
+   -# The final result equals <code>(1.0f-fract)*a + fract*b;</code>
+
+  where
+  <pre>
+     b = Table[index];
+     c = Table[index+1];
+  </pre>
+ */
+
+/**
+  @addtogroup sin
+  @{
+ */
+
+/**
+  @brief         Fast approximation to the trigonometric sine function for floating-point data.
+  @param[in]     x  input value in radians.
+  @return        sin(x)
+ */
+
+float32_t arm_sin_f32(
+  float32_t x)
+{
+  float32_t sinVal, fract, in;                   /* Temporary input, output variables */
+  uint16_t index;                                /* Index variable */
+  float32_t a, b;                                /* Two nearest output values */
+  int32_t n;
+  float32_t findex;
+
+  /* input x is in radians */
+  /* Scale input to [0 1] range from [0 2*PI] , divide input by 2*pi */
+  in = x * 0.159154943092f;
+
+  /* Calculation of floor value of input */
+  n = (int32_t) in;
+
+  /* Make negative values towards -infinity */
+  if (in < 0.0f)
+  {
+    n--;
+  }
+
+  /* Map input value to [0 1] */
+  in = in - (float32_t) n;
+
+  /* Calculation of index of the table */
+  findex = (float32_t)FAST_MATH_TABLE_SIZE * in;
+  index = (uint16_t)findex;
+
+  /* when "in" is exactly 1, we need to rotate the index down to 0 */
+  if (index >= FAST_MATH_TABLE_SIZE) {
+    index = 0;
+    findex -= (float32_t)FAST_MATH_TABLE_SIZE;
+  }
+
+  /* fractional value calculation */
+  fract = findex - (float32_t) index;
+
+  /* Read two nearest values of input value from the sin table */
+  a = sinTable_f32[index];
+  b = sinTable_f32[index+1];
+
+  /* Linear interpolation process */
+  sinVal = (1.0f - fract) * a + fract * b;
+
+  /* Return output value */
+  return (sinVal);
+}
+
+/**
+  @} end of sin group
+ */
-- 
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