Search found 21 matches

by winelight
Fri Mar 24, 2017 4:26 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

I think the exchange rate is determined by the operating system on the PC and how quickly it polls the USB port. Obviously there is an upper limit imposed by the speed of USB too.
by winelight
Mon Sep 14, 2015 9:38 am
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

OK I did remember eventually. But in usbport.sys in W10 I can't find any of the relevant byte sequences.

So I did some research and it appears that Microsoft has removed the poll rate limitation in Windows 10.
by winelight
Wed Aug 05, 2015 11:45 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

I am guessing (it is only a guess) that it will be similar to 7 and Vista; but at a different location and with a slightly different byte sequence. Next week I may have time to take a look if that will help (and if I remember!).
by winelight
Sat Feb 07, 2015 4:39 pm
Forum: V-USB
Topic: porting code to Atmel Studio 6.2
Replies: 3
Views: 3109

Re: porting code to Atmel Studio 6.2

Glad you found the answer and that it worked for you too!
by winelight
Mon Jan 19, 2015 10:00 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

Thanks for that - looks great. I imagine it must be similar on Vista; will do some work on that when I get a chance. (edit) On Vista the location is different (on mine it was 01f824) and the byte sequence is slightly different too: 3C 08 73 09 C6 86 1E 01 00 00 08 Note the two 08s are in the same re...
by winelight
Tue Apr 08, 2014 1:40 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

There is nothing that can be done on Windows 7. I don't know about Windows 8.
by winelight
Tue Jun 18, 2013 9:56 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

Unfortunately that patch only helps mice, I eventually discovered. This is a real problem on Windows and really the only option is to use something else in most cases. Windows XP has a higher polling speed, but the application I run needs a minimum of Windows 7 and ideally Windows 7 64-bit.
by winelight
Sat Jan 19, 2013 1:31 pm
Forum: V-USB
Topic: Can't send double letters?
Replies: 5
Views: 3458

Re: Can't send double letters?

Strangely I did once experience a double letter problem. A dot matrix printer would print a corrupt line if you had a double letter "t" anywhere on it. You had to be careful what you wrote!
by winelight
Mon Jan 14, 2013 12:10 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 107282

Re: USB MIDI Interface

Hi thanks for that. Nice to have it confirmed that I wasn't doing something wrong! I have my project all working now but the latency is too high. I'm using Windows 7 and know it would be better with Linux and its 2mS poll time, but to be honest I will probably go to a USB hardware solution like the ...
by winelight
Mon Jan 14, 2013 12:07 pm
Forum: V-USB
Topic: V-USB USBaspLoader help!!!!!!!
Replies: 2
Views: 1775

Re: V-USB USBaspLoader help!!!!!!!

So what problem are you having?
by winelight
Tue Dec 18, 2012 2:54 pm
Forum: V-USB
Topic: INT0 on D- instead of D+
Replies: 10
Views: 7331

Re: INT0 on D- instead of D+

Glad to hear you got it working. Perhaps this topic might be of use to someone else in the future too. Great!
by winelight
Mon Dec 17, 2012 11:51 am
Forum: V-USB
Topic: INT0 on D- instead of D+
Replies: 10
Views: 7331

Re: INT0 on D- instead of D+

Sorry - misunderstood.
by winelight
Sat Dec 08, 2012 2:36 pm
Forum: V-USB
Topic: First project
Replies: 12
Views: 8085

Re: First project

I believe it's simply the pull-up resistor on the D- line that causes Windows to detect you have plugged something in. Check you have the D+ and D- lines the right way round - the correct colour coding is in Wikipedia, but the first Google hit for the image search has the green and white reversed (o...
by winelight
Sat Dec 08, 2012 12:52 pm
Forum: V-USB
Topic: First project
Replies: 12
Views: 8085

Re: First project

Ah OK. Even on a Windows machine it should detect you plugging it in, that is just a question of the voltage levels, or something. It should come up with an error message, about a device that has malfunctioned, even if nothing works on your board. The D- and D+ should have square waves (or rather, s...
by winelight
Sat Dec 08, 2012 10:08 am
Forum: V-USB
Topic: First project
Replies: 12
Views: 8085

Re: First project

I don't know Linux so I don't know what kernel message you should see.

Are the basics correct? You're using a 12 MHz crystal and 5V supply? Is your device powered from the USB?

Have you gone through all the settings in the config file?