Echelon Neuron C - Manual (Page 53)

Neuron C Reference Guide 33
#pragma relaxed_casting_off
#pragma relaxed_casting_on
These pragmas control whether the compiler treats a cast that removes the
const attribute as an error or as a warning. The cast can either be explicit or
implicit (as in an automatic conversion due to assignment or function
parameter passing). Normally, the compiler considers any conversion that
removes the const attribute to be an error. Turning on the relaxed casting
feature causes the compiler to treat this condition as a warning instead.
These pragmas can be intermixed throughout a program to enable and
disable the relaxed casting mode as desired. See the example for Explicit
Propagation of Network Variables in Chapter 3, How Devices Communicate
Using Network Variables, of the Neuron C Programmer’s Guide .
#pragma run_unconfigured
This pragma causes the application to run whenever it is online, even if the
device is in the unconfigured state. Without this directive, the application
runs only when the device is both online and configured. You can use this
directive to have an application perform some form of local control prior to or
independently of being installed in a network.
Applications that use this pragma and run on firmware versions prior to
version 12 should not attempt to send messages when hard-offline. The hard-
offline state can be detected by calling retrieve_status( ) and checking the
status_node_state field for the value CNFG_OFFLINE. The reason for this
restriction is that the hard-offline state is used by network tools during
configuration modification. Were one to send messages in this state, the
message might be sent using invalid configuration and thus potentially go to
the wrong location. Note that an application is typically taken soft-offline
during modification so the device is only subject to these concerns if it is
power-cycled while the modification is in progress. Applications that do not
use this pragma do not ever run when hard-offline and thus are not
vulnerable to this condition.
This directive is not supported in model files.
#pragma scheduler_reset
Causes the scheduler to be reset within the nonpriority when clause
execution cycle, after each event is processed (see Chapter 7,
Additional
Features, of the Neuron C Programmer’s Guide for more information on the
Neuron scheduler).
This directive is not supported in model files.
#pragma set_guidelines_version string
The Neuron C version 2.1 (and later) compiler generates L ON M ARK
information in the device’s XIF file and in the device’s SIDATA (stored in
device program memory). By default, the compiler uses “3.4” as the string
identifying the L
ON
M
ARK
guidelines version that the device conforms to. To
override this default, specify the overriding value in a string constant
following the pragma name, as shown. For example, a program could specify
#pragma set_guidelines_version “3.2” to indicate that the device conforms to
the 3.2 guidelines. This directive is useful for backward compatibility with
older versions of the Neuron C compiler.