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ssFxpSetU32BitRegion

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

Syntax

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

Arguments

S

SimStruct representing an S-function block.

pVoid

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

dataTypeId

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

regionValue

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

regionIndex

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

Description

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.

Requirement

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

Languages

C

Introduced in R2007b

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