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AM1810 RT Linux IO interrupt response time

Jerome Baron
Intellectual 810 points
Other Parts Discussed in Thread: AM1810

Hi,

 

I was looking at the SDK for the AM1810 and I saw that the linux is a real time linux with the real time patch included.

 

I was wondering if anyone know the minimal IO interrupt latency we can reach with this Linux? Are we talking microsecond or millisecond?

 

Thanks,

Jerome

  • 0
    TI__Mastermind 44306 points

    Jerome,

    we have seen 250us as best case for task cycle latencies on ARM9 platforms so far. This is tested with cyclictest and does give you the time to switch tasks.

    For I/O interrupt latency we have not done any measurements. But if the interrupt is served by a user task you should see at least that time I think.

    Regards.

  • 0 in reply to Frank Walzer
    Intellectual 810 points

    Thanks for your answer. So I must forget this option. I want to respond to an interrupt, fetch some data in memory, compute this data and toglle an IO inside 100us.

     

    I think ill go with SYS/BIOS. My only concern is the in field upgrade for this kind of RTOS. There's no "bootloader" like im used in linux.