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DRV8301-69M-KIT: IQ conversion

Terry Harrison
Intellectual 615 points

Part Number: DRV8301-69M-KIT
Other Parts Discussed in Thread: MOTORWARE

I am working with the motorware api and many of the values are in _IQ. This is easy to create a value such as I want speed to be gMotorVars.SpeedRef_krpm = _IQ(3.0); However I want to send some of these gMotorvars out the serial port for monitoring such as gMotorVars.Is_A. How do I convert this number from _IQ to a decimal? I have read in the forum that many of the values in the gMotorvars are in IQ(24). How do I know which ones are in which? For example the gMotorVars.SpeedRef_krpm = _IQ(3.0) above, how do I know what its range is?

  • 0
    TI__Expert 5410 points

    Hi Terry,

    Terry Harrison said:
    How do I convert this number from _IQ to a decimal?

    You can use the _IQNtoF() function.

    Terry Harrison said:
    How do I know which ones are in which?

    You can figure it out from the code. _IQN(a) = 2^N * a. Can you provide a specific example where you are not able to figure it out?

    Terry Harrison said:
    For example the gMotorVars.SpeedRef_krpm = _IQ(3.0) above, how do I know what its range is?

    What is the GLOBAL_Q value? Based on this, we would know the range based on the above formula. 

    Let me know if you need any further clarification.

    -Shantanu