Renesas 70 Manual De Usuario

   

- 16 - 

How does the programmer use the real-time OS in a program?

   

First, it is necessary to call up a real-time OS function from the program in some way or other. Calling a 
real-time OS function is referred to as a service call. Task activation and other processing operations can be 
initiated by such a service call (See Figure 3.9). 

 

 

Key input 

Task

   

Real-time OS

Remote control 

task 

Service call 

Task switching

 

This service call is realized by a function call when the application program is written in C language, as shown 
below.  

 

sta_tsk(ID_main,3); 

 

Furthermore, if the application program is written in assembly language, it is realized by an assembler macro 
call, as shown below. 

 

sta_tsk #ID_main,#3