TMS320F280049C: Why do we use IQmath in CCS?

Suraj Ajjampur

Part Number: TMS320F280049C
Other Parts Discussed in Thread: C2000WARE

Good Morning everyone,

I am a fresher and new to programming, not to mention new to working with TI controllers with FOC motordrive.

I have a few questions on IQ math, kindly explain.

Why do we use IQ_math?
Is it for floating or fixed point representation?
What is the _iq data type?
Explain how this particular IQ conversion is being used in the macros definition given below.

// .9999 / 4000 converted to IQ26 fixed point format
#define MECH_SCALER     16776

Regards,

Suraj

+1 Shanty over 5 years ago

Hi Suraj,

1) To seamlessly use fixed point for optimal speed and high accuracy.

2) Fixed point

3) Please check the IQMathLib.h header file in c2000ware. It is defined as typedef long _iq;

4) Use the formula:_IQN(a) = 2^N * a.

Please check the docs in <c2000ware>/libraries/math/IQMath/c28/docs and examples in the same dir for more information.

Hope this helps.

-Shantanu

0 Suraj Ajjampur over 5 years ago in reply to Shanty

Thank you so much shantanu

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