Re: FW: [avrdude-dev] Windows port (was: Butterfly proposal: Exit upgradefunction)

[E. Weddington]

On 6 Feb 2004 at 2:22, Jan-Hinnerk Reichert wrote:

> Hi again,
> 
> I have done some tests and reading on the changes regarding 
> serial-ports. I even read stuff in the microsoft database ;-(
> 
> The serial open should be safe the way it is ;-)
> 
> Now for the speed testing. I have just done read tests on an AVR910. 
> Benefits on STK500 should be unnoticeable, because of the better 
> protocol.
> 
> Reading flash of ATmega161:
> avrdude 4.3.0, linux "-low_latency": 81.93s
> avrdude 4.3.0, linux "low_latency":  31.60s
> avrdude 4.3.0, windows:              82.32s
> avrdude-Martin:                      31.59s
> 
> So the use of Windows-API is equivalent to switching serial ports to 
> low latency under Linux. This is a great benefit.
> 
> In addition this makes it possible to gain even more speed by reducing 
> the FIFO-threshold.
> 
> avrdude-Martin, receive_fifo_threshold=1: 14.53s

Huh. Very interesting.
This also applies to an app that I'm working on for my job. Thanks!

 
> Although it looks like the udelay()-stuff needs some further 
> investigation, I think we should merge the changes regarding serial 
> interface as soon as possible.
> 
> BTW: The FIFO-thresholds can be adjusted in Device-Manager (hope this 
> is the right term). Although it doesn't say so, WinXP needs a restart 
> before changes take effect ;-(

Why would it need to restart? I don't think Win2000 needs a restart, but I'll 
do some checking.
 
Eric