From 5b81bc8ccbd342b8566d88fc9f17a73aec03b5b6 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Wed, 29 Jan 2025 21:34:25 -0500
Subject: initial commit
---
.../DSP/Source/FastMathFunctions/arm_sin_q15.c | 83 ++++++++++++++++++++++
1 file changed, 83 insertions(+)
create mode 100644 Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_q15.c
(limited to 'Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_q15.c')
diff --git a/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_q15.c b/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_q15.c
new file mode 100644
index 0000000..81f0d62
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sin_q15.c
@@ -0,0 +1,83 @@
+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_sin_q15.c
+ * Description: Fast sine calculation for Q15 values
+ *
+ * $Date: 23 April 2021
+ * $Revision: V1.9.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 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 "dsp/fast_math_functions.h"
+#include "arm_common_tables.h"
+
+/**
+ @ingroup groupFastMath
+ */
+
+/**
+ @addtogroup sin
+ @{
+ */
+
+/**
+ @brief Fast approximation to the trigonometric sine function for Q15 data.
+ @param[in] x Scaled input value in radians
+ @return sin(x)
+
+ The Q15 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*PI).
+ */
+
+q15_t arm_sin_q15(
+ q15_t x)
+{
+ q15_t sinVal; /* Temporary input, output variables */
+ int32_t index; /* Index variable */
+ q15_t a, b; /* Two nearest output values */
+ q15_t fract; /* Temporary values for fractional values */
+
+
+ if (x < 0)
+ { /* convert negative numbers to corresponding positive ones */
+ x = (uint16_t)x + 0x8000;
+ }
+
+ /* Calculate the nearest index */
+ index = (uint32_t)x >> FAST_MATH_Q15_SHIFT;
+
+ /* Calculation of fractional value */
+ fract = (x - (index << FAST_MATH_Q15_SHIFT)) << 9;
+
+ /* Read two nearest values of input value from the sin table */
+ a = sinTable_q15[index];
+ b = sinTable_q15[index+1];
+
+ /* Linear interpolation process */
+ sinVal = (q31_t) (0x8000 - fract) * a >> 16;
+ sinVal = (q15_t) ((((q31_t) sinVal << 16) + ((q31_t) fract * b)) >> 16);
+
+ /* Return output value */
+ return (sinVal << 1);
+}
+
+/**
+ @} end of sin group
+ */
--
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