More Wishbone Slots

[arnonh 0]

Is it possible to add more Wishbone Slots to the ZPUino?

 

[alvieboy 25]

Yes, it is.

You can use a "hub" to demultiplex one of the existing slots into, let's say, 1-to-8. However, current software is not aware of this.

This is actually somehting I have discussed earlier with Jack.

Do you need this in a short term ?

[arnonh 0]

After more thought about my problem I think thak threr might be a better solution for me than more wishbone slots

I want to talk to 12-15 Uart devices

from a block of ram (like frame buffer)

something vary smiliar to what you did for soundpuddle.

But with uart insted of SPI

[alvieboy 25]

Ok... all transmission-only ?

That should be fairly easy for transmission.

[arnonh 0]

I also need to receive

but vary little data and at lower speed

[mog 0]

I have exactly the same case but I need to receive on 10 UARTs. I've been following this tutorial - http://gadgetfactory.net/learn/2013/11/15/papilio-schematic-library-10-serial-ports/- and discovered that ZPUino Soft Processor - Papilio One 500K - Vanilla - v2.0 has only 9 whishbone slots and not 10 as in the original tutorial (Whishbone Slot 7 is missing). How could I add the missing one to the equation?

[alvieboy 25]

One of the slots is used internally, so you only be able to access nine of them. So total number of avalable slots is 15.

 

One option is to create a "HUB" that will get you 15 more slots. Would that work for you ?

[mog 0]

That would be perfect. How can I do that? 

[alvieboy 25]

Let me discuss this with Jack first, because it requires changing libraries to support the new HUB functions.

[arnonh 0]

Wouldn't it be easier to create one wishbone device with multiple uarts (with corresponding library) ?

[alvieboy 25]

Not really. I actually have been thinking about this HUB thing for some time, so it's basically already designed in my head, just needs implementation.

[alvieboy 25]

Only one thing missing: you need interrupts ? Will be hard to figure out where the interrupt came from (you know it's from the HUB, not necessarly from which device)

 

Alvie