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tiffanychen
Visitor II
October 9, 2008
Question

GPIO speed

  • October 9, 2008
  • 3 replies
  • 988 views
Posted on October 09, 2008 at 05:54

GPIO speed

    This topic has been closed for replies.

    3 replies

    T
    tiffanychenAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:51

    Now I run PLL at 96MHZ PLL and FLASH at 48MHZ, when I set one GPIO from

    0->1->0, it takes about 400ns... is it normal?

    But if I calculate the ideal speed of it, it should be less than 50ns, right? Because I need to use GPIO to simulate parallel port data/address... now the actual speed of GPIO is too slow... Is anyone know how to improve it? Please kindly give me advices.

    Thank you very much.

    M
    m_j_butcher
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:51

    Hi

    See:

    '' TARGET=''_blank''>

    http://www.st.com/mcu/forums-cat-4852-html

    >

    6MHz square wave (12MHz toggle)is achievable.

    Regards

    Mark

    http://www.uTasker.com

    E
    electrogvlieghe
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:51

    Hello,

    I develop an application with the STR9-Comstick. The idea is to control the I/O ports with a program in Visual Basic through the USB-B connector near the pins of I/O ports.

    Which dll use for that for the enumeration ?

    The first application will be to generate a TTL signal for differents frequencies through a pin of the I/O ports. Is there a way to program it in C (TTL signal) for the STR9 ? And so the program in VB ?

    Regards

    Vlieghe Guillaume

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