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Set stored integer value for 32-bit region of real, scalar signal element

The ssFxpSetU32BitRegionCompliant function can be ignored. This function no longer has any impact on the memory layout for inputs and outputs. The memory layout introduced in R2008a is always used.


extern ssFxpSetU32BitRegion(SimStruct *S,
                            void *pVoid
                            DTypeId dataTypeId
                            uint32 regionValue
                            unsigned int regionIndex)



SimStruct representing an S-function block.


Pointer to the storage container of the real, scalar signal element in which the 32-bit region of interest resides.


Data type ID of the registered data type corresponding to the signal.


Stored integer value that you want to assign to a 32-bit region.


Index of the 32-bit region whose stored integer value you want to set, where 0 accesses the least significant 32-bit region.


This function sets regionValue as the stored integer value of the 32-bit region specified by regionIndex, associated with the fixed-point data type designated by dataTypeId. You can use this function with any fixed-point data type, including those with word sizes less than 32 bits. If the fixed-point word size is less than 32 bits, ensure that the remaining bits are sign extended.

This function generates an error if dataTypeId represents a floating-point data type, or if the stored integer value that you set is invalid.

To view an example model whose S-functions use the ssFxpSetU32BitRegion function, at the MATLAB® prompt, enter fxpdemo_sfun_user_U32BitRegion.


To use this function, you must include fixedpoint.h and fixedpoint.c. For more information, see Structure of the S-Function.



Version History

Introduced in R2007b