163 lines
4.3 KiB
Plaintext
163 lines
4.3 KiB
Plaintext
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//#############################################################################
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// \file asin.cla
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//
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// \brief Arc Sine Example
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//
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//#############################################################################
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// $Copyright:
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// Copyright (C) 2023 Texas Instruments Incorporated - http://www.ti.com/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// $
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//#############################################################################
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//
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// Included Files
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//
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#include "cla_ex1_asin_shared.h"
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//
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// Defines
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//
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//
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// Globals
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//
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// Note that the globals defined in the .cla source are global to the cla source
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// file. i.e. they may be shared across tasks. All of the data shared between
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// the CLA and the C28x CPU must be defined in the C (or C++) code, and not the
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// CLA code.
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//
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//
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// Function Definitions
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//
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//Task 1 : Calculate asin(X)
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// Description:
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// Step(1): Calculate absolute of the input X
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//
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// Step(2): Use the upper 6-bits of input "X" value as an
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// index into the table to obtain the coefficients
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// for a second order equation:
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//
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// _FPUasinTable:
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// CoeffA0[0]
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// CoeffA1[0]
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// CoeffA2[0]
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// .
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// .
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// CoeffA0[63]
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// CoeffA1[63]
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// CoeffA2[63]
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//
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// Step(3): Calculate the angle using the following equation:
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//
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// arctan(Ratio) = A0 + A1*Ratio + A2*Ratio*Ratio
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// arctan(Ratio) = A0 + Ratio(A1 + A2*Ratio)
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//
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// Step(4): The final angle is determined as follows:
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//
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// if( X < 0 )
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// Angle = -Angle
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__interrupt void Cla1Task1 ( void )
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{
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//
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//Local Variables
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//
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int xTblIdx; //integer valued Table index
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float A0,A1,A2; //Table coefficients
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float *entry;
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float result;
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//
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//Preprocessing
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//
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__mdebugstop();
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xTblIdx = fVal * TABLE_SIZE_M_1; //convert table index to u16-bits
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xTblIdx = xTblIdx * 3; //Table is ordered as 3 32-bit coefficients, the
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//index points to these triplets, hence the *3*sizeof(float)
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entry = &CLAasinTable[xTblIdx];
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A0 = *entry++;
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A1 = *entry++;
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A2 = *entry;
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result = A0 + fVal*(A1 + A2*fVal);
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//
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//Post processing
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//
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if(fVal < 0)
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{
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result = - result;
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}
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fResult = result;
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}
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interrupt void Cla1Task2 ( void )
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{
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}
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interrupt void Cla1Task3 ( void )
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{
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}
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interrupt void Cla1Task4 ( void )
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{
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}
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interrupt void Cla1Task5 ( void )
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{
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}
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interrupt void Cla1Task6 ( void )
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{
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}
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interrupt void Cla1Task7 ( void )
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{
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}
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interrupt void Cla1Task8 ( void )
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{
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}
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//
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// End of file
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//
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