From 9f95ff5b6ba01db09552b84a0ab79607060a2666 Mon Sep 17 00:00:00 2001 From: Ali Labbene Date: Wed, 11 Dec 2019 08:59:21 +0100 Subject: Official ARM version: v5.4.0 Add CMSIS V5.4.0, please refer to index.html available under \docs folder. Note: content of \CMSIS\Core\Include has been copied under \Include to keep the same structure used in existing projects, and thus avoid projects mass update Note: the following components have been removed from ARM original delivery (as not used in ST packages) - CMSIS_EW2018.pdf - .gitattributes - .gitignore - \Device - \CMSIS - \CoreValidation - \DAP - \Documentation - \DoxyGen - \Driver - \Pack - \RTOS\CMSIS_RTOS_Tutorial.pdf - \RTOS\RTX - \RTOS\Template - \RTOS2\RTX - \Utilities - All ARM/GCC projects files are deleted from \DSP, \RTOS and \RTOS2 Change-Id: Ia026c3f0f0d016627a4fb5a9032852c33d24b4d3 --- docs/DSP/html/group__cos.html | 235 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 235 insertions(+) create mode 100644 docs/DSP/html/group__cos.html (limited to 'docs/DSP/html/group__cos.html') diff --git a/docs/DSP/html/group__cos.html b/docs/DSP/html/group__cos.html new file mode 100644 index 0000000..70ad705 --- /dev/null +++ b/docs/DSP/html/group__cos.html @@ -0,0 +1,235 @@ + + + + + +Cosine +CMSIS-DSP: Cosine + + + + + + + + + + + + + + +
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CMSIS-DSP +  Version 1.5.2 +
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CMSIS DSP Software Library
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+Functions
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Cosine
Fast Math Functions
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+Functions

float32_t arm_cos_f32 (float32_t x)
 Fast approximation to the trigonometric cosine function for floating-point data. More...
 
q15_t arm_cos_q15 (q15_t x)
 Fast approximation to the trigonometric cosine function for Q15 data. More...
 
q31_t arm_cos_q31 (q31_t x)
 Fast approximation to the trigonometric cosine function for Q31 data. More...
 
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Description

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Computes the trigonometric cosine 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 and in the range [0 2*pi) 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.

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The implementation is based on table lookup using 256 values together with linear interpolation. The steps used are:

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  1. Calculation of the nearest integer table index
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  2. Compute the fractional portion (fract) of the table index.
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  3. The final result equals (1.0f-fract)*a + fract*b;
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where

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Function Documentation

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float32_t arm_cos_f32 (float32_t x)
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Parameters
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[in]xinput value in radians.
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Returns
cos(x).
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References FAST_MATH_TABLE_SIZE, and sinTable_f32.

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Referenced by main().

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q15_t arm_cos_q15 (q15_t x)
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Parameters
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[in]xScaled input value in radians.
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Returns
cos(x).
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The Q15 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi).

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References FAST_MATH_Q15_SHIFT, and sinTable_q15.

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q31_t arm_cos_q31 (q31_t x)
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Parameters
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[in]xScaled input value in radians.
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Returns
cos(x).
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The Q31 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi).

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References FAST_MATH_Q31_SHIFT, and sinTable_q31.

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+ + + + -- cgit