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PostPosted: 17.09.2002 00:35 
Please remove your USB port from your MOD Lab.

Adding 5V devices to an existing USB port is a bad idea. While it's ok for an electrical perspective; it isn't from a software perspective. :mad:

EVERY USB-powered device on a USB bus *MUST* report back the maximum amount of power it will draw when it is FIRST plugged into the USB port. It's the OSes' job to calculate the amound of power needed to run all the devices on a said port and IF there isn't enough power available; refuse to "initialize" the new device.

Devices usually hard code the amount of power they draw into a register. They DO NOT dynamically calculate this current need.

By placing a fan or other device on the USB without an associated usb controller, you violate the purpose and specification of USB. This can lead to damage or at the very least an unstable USB bus.

If your going to do it; learn to write a USB driver and implemented it correctly. ;)

John


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