IQmath Library

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C-Callable ASM Interface C-Callable ASM Interface Declaration Global IQ function (IQ format = GLOBAL_Q) _iq _IQsinPU(_iq A) Q format specific IQ function (IQ format = IQ1 to IQ30) _iqN _IQNsinPU(_iqN A) Input Format Global IQ function (IQ format = GLOBAL_Q) Input argument is in per-unit radians and represented as fixed-point number in GLOBAL_Q format. Q format specific IQ function (IQ format = IQ1 to IQ30) Input argument is in per-unit radians and represented as fixed-point number in IQN format (N=1:30). Output Format Global IQ function (IQ format = GLOBAL_Q) This function returns the sine of the input argument as fixed-point number in GLOBAL_Q format. Example Q format specific IQ function (IQ format = IQ1 to IQ30) This function returns the sine of the input argument as fixed-point number in IQN format (N=1:30) The following example obtains the sin ( 0.25×π ) Q30 format in the <strong>IQmath</strong> header file. =0.707 assuming that GLOBAL_Q is set to #include /* Header file for <strong>IQmath</strong> routine */ #define PI 3.14156 _iq in1, out1; _iq30 in2, out2; void main(void ) { in1=_IQ(0.25*PI/PI); /* in1 = 0 .25× π × 2 30 = 08000000h */ out1=_IQsinPU(in1) /* out1= sin ( 0.25 ) × 2 30 = 2D413CCCh 2π ×π */ in2=_IQ30(0.25*PI/PI); /* in2 = 0 .25× π × 2 30 = 08000000h */ out2=_IQ30sinPU(in2); /* out2= sin ( 0.25 ) × 2 30 = 2D413CCCh } 2π ×π */ ©Texas Instruments Inc., June 2002 38
IQNsinPU Function vs C Float SIN: Input varies from 0 to Fixed Point vs Floating Point Analysis 2 π in per unit representation ©Texas Instruments Inc., June 2002 39
Page 1 and 2: IQmath Library A Virtual Floating P
Page 3 and 4: IMPORTANT NOTICE Texas Instruments
Page 5 and 6: Contents 1. Introduction………
Page 7 and 8: Function Name C28x IQmath LIBRARY B
Page 9 and 10: Chapter 1: Introduction 1.1. Introd
Page 11 and 12: Chapter 3: Using IQmath Library 3.1
Page 13 and 14: 3.3. Calling a IQmath Function from
Page 15 and 16: 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: IQNsinPU Description Fixed point SI
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 69 and 70: IQNmag Magnitude of IQ complex numb
Page 71 and 72: IQNabs Absolute value of IQ number
Page 73: Appendix A: IQmath C-Calling Conven

IQmath Library

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