If any USB device makes the noise, they all will.
The computer finds a USB device and gets it's unique product ID number. Then it goes "dee-dum" and looks for software matching that number.
No noise means there is a problem in the firmware or the hardware.
Product ID numbers are a problem if you want to make USB devices. The numbers are free but you have to join the USB club to get them which costs about £3k IIRC. When I needed numbers I searched the web and found a USB club member wanting to sell me ten numbers for a hundred pounds or so which is how I got around it. Wonder what number you are using.
The USB device ID is a combination of device, interface and endpoint configurators. These are set by firmware after the PIC is reset and then the sequence is:
When the device is initially attached to the bus, the host8. Set a configuration. >>this is where windows tries to load the required software
enters an enumeration process in an attempt to identify
the device. Essentially, the host interrogates the device,
gathering information such as power consumption, data
rates and sizes, protocol and other descriptive
information; descriptors contain this information. A
typical enumeration process would be as follows:
1. USB Reset: Reset the device. Thus, the device
is not configured and does not have an address
2. Get Device Descriptor: The host requests a
small portion of the device descriptor.
3. USB Reset: Reset the device again.
4. Set Address: The host assigns an address to the
device. >> this is where the de dum sound occurs
5. Get Device Descriptor: The host retrieves the
device descriptor, gathering info such as
manufacturer, type of device, maximum control
6. Get configuration descriptors.
7. Get any other descriptors. >>during 5,6,7 Windows refines its understanding of the device, this is where you'll see 'Found generic HID' followed by 'Found <some device class>'
Since the ProductID is expensive the specifics are often in the later configurators, using a generic ProductID at the top level.
If you are unable to get Windows to recognise the USB device, you could try downloading a USB diagnostic tool. Does the device appear in Device Manager as an 'Unknown device' with a yellow question mark? If so then Windows is not recognising the descriptor as one of the generic classes. If it doesnt appear at all then the USB controller isnt able to do the initial reset/enumeration (steps 1 - 3 above) and Windows will never know the device exists. If this is the case then the problem is in your hardware or software (including the Microchip USB libraries) and without a full scale debugger and source code and the knowledge to use it there is little anyone can do to help.
The Following User Says Thank You to irving2008 For This Useful Post:
I just had a quick look on www.usb.org and it seems you can now get vendor ID numbers for a mere $2k.
Not as bad as I remembered it but they've now added a clause to say you can't sell numbers on. Too late guys :naughty:
If you're using a Microchip product (which this is), then you can apply for a PID and use their VID - although if usb.org has changed their rules, then I don't know if it's still applicable (I did download their application form a week ago though, so it's not been removed - but then I did find a direct link to it off another website, and they may have not removed it; only their links to it).
Click "two option" link in "Getting a vendor ID"
Click the third of the two options, ""vendor ID" no logo licence
Gets you here...
First paragraph includes the restriction
Paragraph 2, the admin fee, results in the Yorksire War Cry...
please help me.. i have been working on pic18f4550 for making a usb to parallel port ,,, i saw a hope after looking this thread...
due to cost reasons i can stick to pic18f4550 only...
the firmware and software links are dead please update ,,some one help :( :( !!!!!
there are some more doubts regarding this thread,after i program the micro controller and make all driver loading will my computer will detect it as LPT ? (as printer port in device manager like that of desktop systems)if know that how will be able to access the DB29 port?
:( :( i am in an urgent need of help... i will be very thank ful; :)
CLaNZeR (CNCDudeZ) direct but he's not been around for a while and I don't think he supports this project any more.
Hi welcome back Sean... Google was reporting the .co.uk site as off the air earlier today when i tried it...said their last cache was the 14th December..
Hey welcome back Sean and when you popin in for this cup of tea on the way through Swindon?
PaulIf the nagging gets really bad......Get a bigger shed:naughty:
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