Echelon Neuron C - Manual (Page 141)

Neuron C Reference Guide 121
if (power_up())
initialize_hardware();
else {
// hardware already initialized
...
}
}
preemption_mode( ) Function
The preemption_mode( ) function returns a TRUE if the application is currently
running in preemption mode, or FALSE if the application is not in preemption
mode. Preemption mode is discussed in Chapter 3, How Devices Communicate
Using Network Variables, of the Neuron C Programmer's Guide .
Syntax
#include <status.h>
boolean preemption_mode (void);
Example
void f(void)
{
if (preemption_mode()) {
// Take some appropriate action
...
}
}
propagate( ) Built-in Function
The propagate( ) built-in function allows a device’s application program to
request that the latest value for one or more of its output network variables be
sent out over the network. Any bound (that is, connected) output network
variable can be propagated at any time. Propagating an unbound output
network variable has no effect on the network, allowing the application to run the
exact same code, regardless of whether the network variable is unbound or is
bound to many network variables.
If an array name is used, then each element of the array is propagated. An
individual element can be propagated by using an array index.
Input network variables cannot be propagated, and calls to propagate( ) for input
network variables have no effect.
This function allows variables to be sent out even if they are declared const, and
are thus in read-only memory (normally a network variable’s value is sent over
the network only when is the application writes a new value to the network
variable). Also, it permits updating a network variable through a pointer, and
then causing the variable to be propagated separately.
Polled output network variables can be propagated with the propagate( )
function. However, if an output network variable is declared as polled, but is also
affected by the propagate( ) function, the polled attribute does not appear in the