I am curious about this problem, check the information, the following is the view of online:
"when the Host did not send the SOF exceeds 3 ms (usually enter the Host in dormancy or peripherals sleep), peripheral set himself into low power consumption, and then changes into listening mode if you have any signal detection to the bus (as long as is not the same as before sleep) immediately aroused"
and then I'll use a wired keyboard, into the computer, after dormancy computer identified with the keyboard can wake the computer,
Then dormancy computer, open the keyboard, try to put the D + D - respectively for power and for short circuit, found that is useless, computers don't wake up, but this time press button again, also can't wake up, that the USB keyboard can hang up and the experiment results and the Internet does not agree!
I don't have this oscilloscope, couldn't catch normal waveform of awakening,
Excuse me who know is how to return a responsibility, how to wake up the computer, what specific waveform?
Thank you very much!
CodePudding user response:
I don't know, but the USB is a differential signal, you directly take a short or power is wrong, because it is not a TTL signalCodePudding user response:
Thank you upstairs! Does anyone know?