Echelon Neuron C - Manual (Page 233)

Neuron C Reference Guide 213
parm-declaration :
declaration-specifier-list parm-declarator-list ;
parm-declarator-list :
parm-declarator-list , declarator
declarator
Conditional Events
In Neuron C, an event is an expression which can evaluate to either TRUE or
FALSE. Neuron C extends the ANSI C concept of conditional expressions
through special built-in functions that test for the presence of special Neuron
firmware events. The Neuron C compiler has many useful built-in events that
cover all the common cases encountered in Neuron programming. However, a
Neuron C programmer can also create custom events by using any parenthesized
expression as an event, including one or more function calls, and so on.
when-event :
( reset )
predefined-event
parenthesized-expr
interrupt-event :
( repeating [, frequency-value ] )
( io-object-declarator )
( io-object-pin-name, interrupt-condition )
predefined-event :
( flush_completes )
( offline )
( online )
( wink )
( complex-event )
Complex Events
All of the predefined events shown above can be used not only in the when-clause
portion of the task declaration but also in any general expression in executable
code. The complex events below use a function-call syntax, instead of the
keyword syntax of the special events above.
complex-event :
io-event
message-event
net-var-event
timer-event
io-event :
io_update_occurs ( variable-identifier )
io_changes ( variable-identifier )
io_changes ( variable-identifier ) by shift-expr
io_changes ( variable-identifier ) to shift-expr