National Instruments NI MATRIX Invoking Procedures Using Generated Subsystem Function

Chapter 2 C Language Reference

properly. Refer to the SystemBuild User Guide for an explanation of

rinfo. Only the first four elements of this array will be used by the

generated procedure. This array will be passed as argument rinfo.

3. Create an array sized by the number of inputs in the procedure (referto

the comment) of type double and copy in the inputs to the procedure.

This array will be passed as argument U. Also create a variable of type

int and initialize to the number of inputs in the procedure. A pointer

to this variable will be passed as argument NU.

4. Create an array sized by the number of outputs in the procedure (refer

to the comment) of type double where the outputs of the procedure

will be stored. This array will be passed as argument Y. Also create

avariable of type int and initialize to the number of outputs in the

procedure. A pointer to this variable will be passed as argument NY.

5. Create two arrays sized by the number of states in the procedure (refer

to the comment) of type double and initialize all elements to 0.0.

These arrays will be passed as arguments X (states) and XD

(derivatives). Also create a variable of type int and initialize to the

number of states in the procedure. A pointer to this variable will be

passed as argument NX.

6. Create two arrays sized by the number of integer and real parameters

in the procedure. Refer to the comment of types int and double and

initialize all elements to 0 and 0.0, respectively. These arrays will be

passed as arguments I_P and R_P.

7. Invoke the procedure using the arrays and pointers to the variables

created in steps 1 through 6.

Invoking Procedures Using Generated Subsystem Function

When generating a reusable procedure from a Procedure SuperBlock, along

with the algorithmic procedure and the (UCB-style) wrapper, a subsystem

function (subsys_

number

) also is generated. You can use the subsystem

function directly from your application to invoke the procedure, but keep

in mind that this function is not re-entrant, as several variables in this

function are declared static to avoid the overhead of copy in and out of the

variables.

All of the following arguments need to be passed for each call to the

procedure in the following order: U, Y. These arguments are pointers to

structures reflecting the procedure’s inputs and outputs. The inputs to the

subsystem are provided by the argument U, a pointer to a structure named

_Subsys_

number

_in (or _Sys_ExtIn). This structure has mixed