National Instruments AutoCode NI MATRIX - Manual (Page 75)

Chapter 3 Ada Language Reference
© National Instruments Corporation 3-13 AutoCode Reference
The operations within UCBs are controlled by the INFO argument, a record
of RT_STATUS_RECORD type that is passed as part of the argument list for
each UCB:
type RT_STATUS_RECORD is
record
ERROR: RT_INTEGER;
INIT: RT_BOOLEAN;
STATES: RT_BOOLEAN;
OUTPUTS: RT_BOOLEAN;
end record;
The following example shows the general form of UCB equations and
indicates how the
INFO status record is used to control the computations.
if INFO.INIT then
-- do user code initialization
INFO.INIT := FALSE;
end if;
if INFO.OUTPUTS then
-- do output calculations having the general form:
-- Y := h(T,X,XD,U,R_P,I_P);
end if;
if INFO.STATES then
-- do state update calculations with the general form:
-- XD := f(T,X,XD,U,R_P,I_P);
end if;
When an error occurs within the UCB, set INFO.ERROR:= some nonzero
integer value as an error return. Also, make sure that INFO.INIT is set to
FALSE at the end of the initialization cycle.
To link UCBs (either handwritten or generated) with generated scheduled
subsystem code, compile the UCBs, required
sa_* files, and the generated
scheduled subsystem code and link them together to build an application.
I_P:in out RT_INTEGER An array of integer parameters.
NIP:in out RT_INTEGER The number of integer parameters.
Table 3-5. UCB Calling Arguments and Data Types (Continued)
Argument Data Type Description