interrupt handler

[Jython]

HI, ALL!
now i use this mode for interrupt in rtems

status = rtems_interrupt_handler_install(
        STM32F4_IRQ_USART2,
        "SP2",
        RTEMS_INTERRUPT_UNIQUE,
        (rtems_interrupt_handler) USART2_handler,
        NULL
    );

for usart i must to make function O0  to make it work well

now for rtc wakeup , it happened some weird thing, it loop in it
https://lists.rtems.org/pipermail/users/2019-April/033176.html
i dont know where is the problem
maybe i miss something important
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