IQmath Library

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Fixed Point vs Floating Point Analysis Fixed Point inverse SQRT Function vs C Float inverse SQRT ©Texas Instruments Inc., June 2002 60
IQNmag Magnitude of IQ complex number Description This function calculates the magnitude of two orthogonal vectors as follows: Mag = sqrt(A^2 + B^2). This operation achieves better accuracy and avoids overflow problems that may be encountered by using the "_IQsqrt" function. A B IQNmag output Availability C-Callable Assembly (CcA) Module Properties Type: Target Independent, Application Independent Target Devices: x28xx C/CPP Interface Files: IQmathLib.h, IQmathCPP.h & IQmath.lib Item C-Callable ASM Comments Code Size 96 words Data RAM 0 words Multiple instances N/A Reentrancy Yes Multiple Invocation Yes Stack usage 2 words Stack grows by 2 words Accuracy 29-bits (Same as SQRT function) ©Texas Instruments Inc., June 2002 61
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IQmath Library A Virtual Floating P
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IMPORTANT NOTICE Texas Instruments
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Contents 1. Introduction………
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Function Name C28x IQmath LIBRARY B
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Chapter 1: Introduction 1.1. Introd
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Chapter 3: Using IQmath Library 3.1
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3.3. Calling a IQmath Function from
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CASE II : A complete system consist
Page 17 and 18: Chapter 4: Function Summary The rou
Page 19 and 20: Trignometric Functions: Functions D
Page 21 and 22: Chapter 5: Function Description ©T
Page 23 and 24: IQNtoF Float to IQN data type Descr
Page 25 and 26: IQNint Integer part of IQN number D
Page 27 and 28: IQtoIQN GLOBAL_Q number to IQN Desc
Page 29 and 30: IQtoQN GLOBAL_Q number to QN Descri
Page 31 and 32: IQNmpy IQ Multiplication(IQN*IQN) D
Page 33 and 34: IQNrsmpy IQ Multiplication with rou
Page 35 and 36: IQNmpyI32int Integer portion of (IQ
Page 37 and 38: IQNmpyIQX Multiplication (GLOBAL_Q=
Page 39 and 40: C/C-Callable ASM Interface C/C-Call
Page 41 and 42: Fixed Point vs Floating Point Analy
Page 43 and 44: C-Callable ASM Interface C-Callable
Page 45 and 46: IQNsinPU Description Fixed point SI
Page 47 and 48: IQNsinPU Function vs C Float SIN: I
Page 49 and 50: C-Callable ASM Interface C-Callable
Page 51 and 52: IQNcosPU Fixed point COS (radians i
Page 57 and 58: IQNatan2PU Description Fixed point
Page 65 and 66: IQNisqrt Fixed point Inverse Square
Page 67: Fixed Point vs Floating Point Analy
Page 71 and 72: IQNabs Absolute value of IQ number
Page 73: Appendix A: IQmath C-Calling Conven
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IQmath Library

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