source: rtems-docs/c_user/example_application.rst @ fd6dc8c8

Example Application
###################

.. code:: c

    /*
    *  This file contains an example of a simple RTEMS
    *  application.  It instantiates the RTEMS Configuration
    *  Information using confdef.h and contains two tasks:
    *  a user initialization task and a simple task.
    \*/
    #include <rtems.h>
    rtems_task user_application(rtems_task_argument argument);
    rtems_task init_task(
    rtems_task_argument ignored
    )
    {
    rtems_id          tid;
    rtems_status_code status;
    rtems_name        name;
    name = rtems_build_name( 'A', 'P', 'P', '1' )
    status = rtems_task_create(
    name, 1, RTEMS_MINIMUM_STACK_SIZE,
    RTEMS_NO_PREEMPT, RTEMS_FLOATING_POINT, &tid
    );
    if ( status != RTEMS_STATUS_SUCCESSFUL ) {
    printf( "rtems_task_create failed with status of %d.\\n", status );
    exit( 1 );
    }
    status = rtems_task_start( tid, user_application, 0 );
    if ( status != RTEMS_STATUS_SUCCESSFUL ) {
    printf( "rtems_task_start failed with status of %d.\\n", status );
    exit( 1 );
    }
    status = rtems_task_delete( SELF );    /* should not return \*/
    printf( "rtems_task_delete returned with status of %d.\\n", status );
    exit( 1 );
    }
    rtems_task user_application(rtems_task_argument argument)
    {
    /* application specific initialization goes here \*/
    while ( 1 )  {              /* infinite loop \*/
    /*  APPLICATION CODE GOES HERE
    *
    *  This code will typically include at least one
    *  directive which causes the calling task to
    *  give up the processor.
    \*/
    }
    }
    /* The Console Driver supplies Standard I/O. \*/
    #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
    /* The Clock Driver supplies the clock tick. \*/
    #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
    #define CONFIGURE_MAXIMUM_TASKS 2
    #define CONFIGURE_INIT_TASK_NAME rtems_build_name( 'E', 'X', 'A', 'M' )
    #define CONFIGURE_RTEMS_INIT_TASKS_TABLE
    #define CONFIGURE_INIT
    #include <rtems/confdefs.h>

.. COMMENT: COPYRIGHT (c) 1989-2011.

.. COMMENT: On-Line Applications Research Corporation (OAR).

.. COMMENT: All rights reserved.