Welcome to our new forum
All users of the legacy CODESYS Forums, please create a new account at account.codesys.com. But make sure to use the same E-Mail address as in the old Forum. Then your posts will be matched. Close

MCP23S17 performance

mark0328
2021-05-21
2021-05-21
  • mark0328

    mark0328 - 2021-05-21

    Hi,

    We' d like to use MCP23S17 for High frequency pulse input ex. 1kHz.
    But performance is NG, max.10-20Hz now.
    How can we solve it?

    BR,

    Mark

     
  • eschwellinger

    eschwellinger - 2021-05-21

    I would suggest to check SPI speed,
    I assume you use 1 ms to work with the values (the task which are working with the IO's in CODESYS - maybe a tried is to do > 1ms - but not sure if this works?
    Additional you need to set the CPU speed of the Cores to a fix value,
    because by default they are floating and this influences the SPI speed to - this had
    reported another user I think here in the forum/talk

     

Log in to post a comment.