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Software Application Development Xillinux
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Xillinux

deaxman
deaxman over 12 years ago

How do I attach anything to PS_GPIO in xillydemo?  It says multiple drivers but what if I want to write HDL code to read in a switch and set an LED?  Both are defined as PS_GPIO  (1 through 7 and 11-18 I think) but if I try to set them I get the conflict becuase they are already used in the xillybus_ins module on line 250ish.  Essentially I just want to know what to do to set a light when I flip a switch with Xillybus.  As it is I can't use any of the ports.  I have tried everything I can think of, including a seperate module that I parameterize in the bottom of xillydemo and feed in the PS_GPIOs as lines.  That approach gives no errors, but it acts as if the module isn't even there.  Thanks a ton in advance for any help!

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  • Former Member
    0 Former Member over 12 years ago

    Hello,

    As far as I recall, the PS_GPIO lines are governed by Linux' GPIO driver. As such, they are exposed to any user space program as described, for example, here:

    http://falsinsoft.blogspot.co.il/2012/11/access-gpio-from-linux-user-space.html

    But the truth is I never actually used this interface.

    The mapping between the GPIO numbers and their actual pins can be found in the UCF file that goes with the bundle.

    If you want to connect these directly to your logic, just modify the UCF so that your Verilog/VHDL port goes to the desired pin, and assign some dummy pin to the GPIO[..] port.

    Regards,
       Eli

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  • Former Member
    0 Former Member over 12 years ago

    Hello,

    As far as I recall, the PS_GPIO lines are governed by Linux' GPIO driver. As such, they are exposed to any user space program as described, for example, here:

    http://falsinsoft.blogspot.co.il/2012/11/access-gpio-from-linux-user-space.html

    But the truth is I never actually used this interface.

    The mapping between the GPIO numbers and their actual pins can be found in the UCF file that goes with the bundle.

    If you want to connect these directly to your logic, just modify the UCF so that your Verilog/VHDL port goes to the desired pin, and assign some dummy pin to the GPIO[..] port.

    Regards,
       Eli

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