CompuLab SBC-X270 Manual de usuario descargar pdf (Pagina 62)

SCIOPTA - Real-Time Kernel

6-4 Manual Version 4.1 User’s Manual

SCIOPTA - Real-Time Kernel

6 Messages

6.6 Message Declaration

The following method for declaring, accessing and writing message buffers minimizes the risk for bad message

accesses and provides standardized code which is easy to read and to reuse.

Very often designers of message passing real-time systems are using for each message type a separate message file

as include file. Every process can use specific messages by just using a simple include statement for this message.

You could use the extension .msg for such include files.

The SCIOPTA message declaration syntax can be divided into three parts:

• Message number definition

• Message structure definition

• Message union declaration

6.6.1 Message Number

6.6.1.1 Description

The declaration of the message number is usually the first line in a message declaration file. The message number

can also be described as message class. Each message class should have a unique message number for identification

purposes.

We recommend to write the message name in upper case letters.

6.6.1.2 Syntax

#define MESSAGE_NAME (<msg_nr>)

6.6.1.3 Parameter

msg_nr Message number (ID)

Message number which should be unique for each message class.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 225 226

CompuLab SBC-X270 Manual de usuario Pagina 62