static void StartMain (const void * aAddr)
{
    void (*code_entry)(void);

    struct StartVector {
        uint32_t stack_ptr;        // stack pointer
        uint32_t entry_ptr;        // code entry pointer
    };

    StartVector *start = (StartVector*) aAddr;

    // set interrupt vectors
    SCB->VTOR = (uint32_t)aAddr;

    // get code entry
    code_entry = (void (*)(void)) start->entry_ptr;

    // set stack pointer
    __set_PSP (start->stack_ptr);

    // start application
    code_entry ();
}