How to use multiword in Stateflow/RTW

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Jim Johnson 2014 年 10 月 20 日

コメント済み: Jon Boerner 2014 年 10 月 22 日

I want to have a uint64 on a 32 bit processor. I would like to avoid using fixed point to do this if possible.

Jon Boerner 2014 年 10 月 22 日

Hi Jim,

A couple clarifying questions:

When you say multiword, are you looking for an explicit structure/array construct in the generated code that represents a 64-bit number with two 32-bit entries?
Or are you looking for 64-bit numbers to just be used in the generated code because your compiler is able to accept 64-bit numbers?
Do you not have access to the Fixed-Point Designer product? Is that why you are trying to avoid the use of fixed-point?

A couple other points to keep in mind:

Stateflow does not support the uint64 and int64 data types, so to use 64-bit numbers in Stateflow, the only option is the double data type for a 64-bit data type, and there is no multi-word for that as best I can tell.
The Configuration Parameters Hardware Implentation pane is where you start introducing the multiword behavior
I do not believe any multi-word structures as mentioned above are generated without the Fixed-Point Designer