Search found 9 matches

by adrian.gin
Mon Mar 21, 2011 9:08 pm
Forum: V-USB
Topic: v-usb midi problem
Replies: 4
Views: 3294

Re: v-usb midi problem

are you using usbPoll() in your main loop? You also have to ensure that none of your data ie, midimsg2 or 3 exceeds 0x7F. by the looks of your code you send 0xFF and your midiMsg[2] looks to be possibly out of range. midiMsg[1] = 0xb1; //b1 DIN!!! midiMsg[2] = controll*8 + row; if(1& (input[cont...
by adrian.gin
Mon Mar 21, 2011 2:10 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

I've done a few tests and I've found a hack on machines which allows high speeds on Interrupt Endpoints. Usually, USB Polls low speed interrupt endpoints at: Windows 8ms (minimum) Linux 2ms (minimum) See this page for more details: m Value of bInterval Polling Period (1-millisecond frames) Interrupt...
by adrian.gin
Mon Mar 21, 2011 2:01 pm
Forum: V-USB
Topic: v-usb midi problem
Replies: 4
Views: 3294

Re: v-usb midi problem

"It does not work"

Does this mean that the device under the "Device Manager" shows up as not installed correctly?

under Windows7, they've blocked off the use of Bulk Endpoints for Low speed devices, you can however use interrupt endpoints.
by adrian.gin
Wed Feb 09, 2011 3:07 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

Since Win7 doesn't support Low Speed Bulk endpoints. My version doesn't work anymore.

It works with interrupt endpoints, but its 4 times slower. and latencies suffer as a result.

Until someone makes a Win7 Bulk Low Speed driver or something.... WinXP supported this however...

Cheers,

Adrian
by adrian.gin
Wed Nov 03, 2010 9:50 am
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

I'm sure you changed the code in some way, because the default seems to work for all of us.

and don't say you didnt, because I know you did :P
by adrian.gin
Mon Nov 01, 2010 4:12 am
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

Try using MIDI OX to look at your MIDI ports.

The MIDI port will only show up on MIDI probing software.
by adrian.gin
Wed Oct 27, 2010 7:51 am
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

We clearly don't meet the spec. But then the bulk midi out doesn't either since it's a low speed device :lol:

Does it matter if it 'just works' anyway?
by adrian.gin
Fri Oct 22, 2010 12:42 am
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

Yes, you're absolutely right. Though the 550ohm resistor can (I think be as low as 220ohm) and as high as perhaps 680.... but my calc's showed about 550ohms as the best. For D+ For an AVR high output 5 * 330 / (220 + 330) = 3V (close enough to 3.3V) For an AVR low output 0 * 330 / (220 + 330) = 0V F...
by adrian.gin
Thu Oct 21, 2010 12:59 pm
Forum: V-USB
Topic: USB MIDI Interface
Replies: 93
Views: 117041

Re: USB MIDI Interface

Hi guys, Check this out. Just finished it tonight... in a way. I've built and improved upon the VUSB MIDI project. This one here's called AVRMIDI for change of name sake, yea I know yet another VUSB MIDI project. It's based off the VUSB-MIDI project which was based off the AVRCDC. So kudos and thank...