5 Volts on USB bus ?

[Synthex]

I try within an USB hub, it don't work.
I try to put voltage drop diodes, it don't work.

Thank you for your patience, but I do not really know what else to do ...

[Synthex]

Ok, i change the Atmega8 for a PIC 18F2550 with my own CDC firmware.
And it works so good !

I think the 18F2550 is more robust and better meets USB specifications.
And better, it's USB2

[dmitri]

To be honest I'm puzzled here. My avr-cdc board is correctly detected on my Acer laptop, wife's HP laptop and on the desktop both on built-in ports and over a cheap hub. And this is without voltage drop diodes. I can only recommend to ask at avr-usb forum http://forums.obdev.at/viewforum.php?f=8 . From what I saw on this forum the most likely cause of "malfunctioning device" is incorrect fuses.

[dmitri]

Ok, i change the Atmega8 for a PIC 18F2550 with my own CDC firmware.
And it works so good !

I think the 18F2550 is more robust and better meets USB specifications.
And better, it's USB2

Oh, great! Technically it is a better USB solution. The only obstacle I see with PIC18F2550 is that it requires to build a programmer. Would you be willing to share it's schematics and firmware so that I could publish them on the MegaDrum website as USB Board option?

[dmitri]

And since you've already built MegaDrum, could you post here your first impressions on it?

[Synthex]

Oh, great! Technically it is a better USB solution. The only obstacle I see with PIC18F2550 is that it requires to build a programmer. Would you be willing to share it's schematics and firmware so that I could publish them on the MegaDrum website as USB Board option?

Of course, i will post them.

First, the schematics and the new device window

[dmitri]

"MegaDrum 32 USB" found - I like it:)

[Synthex]

Here is firmware and driver installation.

[slayer666]

A question regarding the driver:
Is the serial-midi driver still nesseary if you use the pic usb solution?

[dmitri]

A question regarding the driver:
Is the serial-midi driver still nesseary if you use the pic usb solution?

I believe since this firmware for 18F2550 is CDC implementation i.e. Serial USB device, serial->midi still will be required. The good thing about 18F2550 is that a MIDI type firmware can be written for it if it's not already done by someone.