[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [microblaze-uclinux] UARTLite at 115200

Hi,

If you send 16 characters at 11500 baud, you send 10 bits for each bye which will
give a new byte receive every 1/1150 s which is 870 us.
That should be no match for the MicroBlaze.

There is nothing in the opb_uartlite that would prohibit the maximum speed.
Another limiting factor can also be the host.

Göran
John Williams wrote:

> Hi Shamile,
>
> Shamile Khan wrote:
> > Just wanted to confirm if you are using and measured the throughput of
> > Uartlite at 115200 KBPS. I only changed the parameter C_BAUDRATE to
> > 115200 and I can only get upto around 17000 KBPS. Is there anything I am
> > missing?
>
> How have you measured the throughput?  I've seen similar things when,
> say using XMD to download binary files onto the board.  The effective
> baudrate is much lower than the "physical" rate.
>
> I think this is because the uartlite has only 16 character tx/rx buffers
> - meaning that it's pretty tough for software to keep up without
> especially the RX buffer over flowing.  The protocol used by xmd to
> communicate with xmdstub has a resync command - i suspect that several
> "resync" and other commands get sent for every word of "real" data.
>
> Now that the uclinux shell is up, I'm trying to get something like a
> zmodem program working as a means of pulling large files (ie kernel and
> filesystem images) over the serial port.  I've successfully built the
> lrzsz package for microblaze uclinux, but haven't got it going yet.
>
> Cheers,
>
> John
>
> ___________________________
> microblaze-uclinux mailing list
> microblaze-uclinux@itee.uq.edu.au
> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/

___________________________
microblaze-uclinux mailing list
microblaze-uclinux@itee.uq.edu.au
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/