Objective Development Forums

hi, sorry for too much questions since it is too much documents about USB. I read the document "USB in a Nutshell" from beyondlogic. In page 5 "Electrical", it state "Certain bus states are indicated by single ended signals on D+, D- or both." It seems no more informati...

(Solved, problem come from 2005 LibUSB-Win32 driver, after update to 2007 version. No problem. Thanks.) hi, I have got two desktop computer for checking my AVR-USB device. Computer I: USB 5V power would be cut off from the host automatically at Windows sleep mode. Observation: Application running a...

hi, I was confused. Tom said D+ has also got this 1kHz pulse. Any reason that why i can't utilized this 1kHz pulse from D+. The D- pin in my layout is not connected to any interrupt. Thanks.

hi, thanks for both you guy's reply. Now, my design's D+ pin is connected to INT0 Do i have to re-layout to D- pin to INT0 or modification of firmware (keep D+ pin to INTO)can solve this issue? Thanks. I want to study more information about this 1kHz idle clock, what documents that i can check about...

I have completed a device that with many LEDs. I have tried it on Windows XP in several desktop computers and notebook computers. Some computer's motherboard design will cut off the 5V power from USB port, some will not. My problem: After shut down of computer. My device's LED are still getting ON, ...

In ATMega8, there are only three I/O port PB0 - PB7, PC0-PC6, PD0 - PD7. My device will be communicate to other device by 8-bit parallel interface. Since PB6 and PB7 is used for crystal oscillation, so the remained choice is PD0 - PD7. However, the PD2(INT0) is used for D+ interrupt communication. M...