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IQmath

All “IQmath” operations have an equivalent floating-point operation

IQmath

Approach

Targeting Fixed

Point or Floating

Point device

Compile & Run

using floating-point math on

C3x, C67x,C28x (RTS), PC,..

Compile & Run

using “IQmath” on

C28x

User selects target math type

(in “IQmathLib.h” file)

Y = _IQmpy(M, X) + B;

#if MATH_TYPE == IQ_MATH #if MATH_TYPE == FLOAT_MATH

Y = (float)M * (float)X + (float)B;

Selecting FLOAT_MATH Or IQ_MATH Mode: As was highlighted in the introduction, we

would ideally like to be able to have a single source code that can execute on a floating-point or

fixed-point target device simply by recompiling the code. The "IQmath" library supports this by

setting a mode, which selects either IQ_MATH or FLOAT_MATH. This operation is performed

by simply redefining the function in a header file. For example:

#if MATH_TYPE == IQ_MATH

#define _IQmpy(M , X) _IQmpy(M , X)

#elseif MATH_TYPE == FLOAT_MATH

#define _IQmpy(M , X) (float) M * (float) X

#endif

Essentially, the programmer writes the code using the "IQmath" library functions and the code

can be compiled for floating-point or "IQmath" operations.

C28x - Numerical Concepts & IQmath 8 - 23

Texas Instruments C28 Series Student Guide

Other manuals for Texas Instruments C28 Series