simple wishbone demo to read switches write leds

[toastedcpu]

Hello,

Is there a real simple demo of the wishbone bus with a simple compatible soft CPU or AXI bridge, to just write to leds and read from switches? The target would be the for arty, zybo.

Frank

[jpeyron]

Hi @toastedcpu,

I have not worked with the wishbone bus. Here and here are some threads that discuss the wishbone bus.

thank you,

Jon

[D@n]

@toastedcpu,

Here's a link to what I call a "special-purpose I/O" controller.  It's wishbone controlled.  I've used it in many of my designs, adjusting the number of LEDs buttons, or switches as necessary.  It references a debouncer to handle the buttons, as well as a "Knight Rider" demo to move a lit LED back and forth just like "Kit" from the old series.

If you are interested in the Arty, you might find this controller interesting.  It's wishbone controlled, and controls the LED's of the Arty while also allowing you to read switches and buttons.  Further, it will control the color LEDs of the Arty as well via a color LED controller also in the distro.

If you are just looking for a simple description of a wishbone slave, you might find this blog post valuable.

Dan