Echelon Neuron C - Manual (Page 36)

16 Predefined Events
online Event
The online event evaluates to TRUE only if the device is offline and an Online
network management message is received from a network tool. The online event
can be used in no more than one
when clause in a program. The task associated
with the online event in a when clause can be used to bring a device back into
operation in a well-defined state.
Syntax
online
Example
when (offline)
{
flush_wait();
// process shut-down command
}
when (online)
{
// resume operation
}
reset Event
The reset event evaluates to TRUE the first time this event is evaluated after a
Neuron Chip or Smart Transceiver is reset. I/O object and global variable
initializations are performed before processing any events. The reset event task
is always the first when clause executed after reset of the Neuron Chip or Smart
Transceiver. The reset event can be used in no more than one when clause in a
program.
A typical application’s reset task initializes peripheral I/O circuitry, prepares the
APIs for utilities and libraries, and initializes application timers and the
interrupt system. See also Initial Value Updates for Input Network Variables in
Chapter 3 of the Neuron C Programmer’s Guide .
The code in a reset task is limited in size. If you need more code than the
compiler permits, move some or all of the code within the reset task to a function
called from the reset task. The execution time for the code in a reset task must
be less than 18 seconds to prevent installation errors due to time-outs in network
tools. If your device requires more than 18 seconds for reset processing, use a
separate and independent task to complete the reset processing. For example,
you can set a global variable within a reset task that is tested within another
when clause to create this independent task.
The power_up( ) function can be called in a reset clause to determine whether the
reset was due to power-up, or to some other cause such as a hardware reset,
software reset, or watchdog timer reset.