Echelon FTXL - Manual (Page 210)

198 Example FTXL Applications
Main Function
The main() function is in the main.c file. The main() function creates an
operating system task by calling the OSTaskCreateExt() μC/OS-II operating
system function with the following arguments:
• Task entry point, which is a pointer to the appTask() function
• A NULL pointer for the arguments to the task
• A pointer to the top of the application stack
• The base priority of the task
• The ID of the task
• A pointer to the bottom of the application stack
• The size of the stack, in OS_STK units
• A NULL pointer for the extended task control block pointer
(OSTCBExtPtr)
• A value of 0 for the options
The main() function then calls the OSStart() μC/OS-II operating system function
to start the operating system. An application should not use the FTXL OSAL
functions for creating a task; if the application needs extra tasks, it should call
operating system functions directly. The OSAL functions for creating a task are
designed for creating FTXL LonTalk protocol stack tasks only.
The main() function is shown below.
/* The main function simply creates the application task
* and then starts multi-tasking
*/
int main(void) {
/* Create an application task to implement the main
control loop. */
OSTaskCreateExt(appTask,
NULL,
(void *)&appStack[APP_STACKSIZE],
OS_APPLICATION_PRIORITY_BASE,
OS_APPLICATION_PRIORITY_BASE,
appStack,
APP_STACKSIZE,
NULL,
0);
/* Start the operating system. The rest of the
* application executes under appTask.
*/
OSStart();
return 0;
}
Application Task Function
The application task function, appTask(), is in the main.c file. The appTask()
function performs the following tasks: