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Using RTX51 Tiny, no main () ?

Adi Sapner

Hi,

I'm trying to learn the MULTI-TASKING concept using RTX51 Tiny.

I noticed that you no longer use the main. You always start with TASK 0. But If I need to INIT my MCU, how do I proceed ?

Because if I put my init() in the TASK0, my MCU will be initialized several time, no ?

Help a newbie ;-)

Thx

  • 0

    I usually have several different sorts of initialization.

    - pre-kernel initialization.

    Relatively rare except for the C runtime and board support type stuff. But sometimes you need to do low-level initialization before anything else happens. This corresponds to Keil's STARTUP.A51, INIT.A51, and perhaps some other code.

    - pre-start initialization

    main() calls a bunch of init functions for various modules before any task starts running. These functions often create tasks, among other things.

    void main (void)
    {
    ModAInit();
    ModBInit();
    ModCInit();

    // start system running
    StartOs();
    }

    - per-task initialization

    Each task does some local initialization of its own when it first starts. Tasks thus have a structure that looks like:

    void TaskBody (void)
    {
    // startup init
    TaskInit();

    // never-ending task body
    for (;;)
        {
        // task activity
        e = WaitForEvent();
        HandleEvent (e);
        }
    } // TaskBody

    Often, embedded software needs to be able to re-initialize itself, so the "main task body" can often call the same init functions, reuse parts of the logic, or just do all of the initialization.

  • 0

    Task 0 is the entry for your program. It must contain a 'forever' loop such as a while(1){...}. Just put your init prior to the while(1) loop. It will init only one time.