Re: [sigrok-devel] FPGA LA - protocol

[Joel H. <jo...@ai...>]

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On 08/07/13 19:40, Peter Stuge wrote:
> Joel Holdsworth wrote:
>> SUMP could be replaced with a more conventional RS232 register 
>> interface and streaming protocol
> 
> If you are going to make something that uses USB in 2013, why on 
> earth would you make it so stupid?

In a word - hardware.

Many of the devices the fpgala firmware could run on have only a UART
interface between the USB interface and the FPGA.

I think Iztok is trying to move towards having a common high level
register interface that works the same over UART, SPI, I2C or any
control bus.

> You are making the number one USB mistake and I think you can do a
> lot better here. As I've said before I would be happy to help 
> design a protocol that is actually suitable for USB, so that we end
> up with something that has a chance of achieving decent 
> performance.

That would be very helpful. Beware though: The protocol will only be
relevant to devices with an FX2 on board.

Joel
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