T3.2 - USB detection?

[danixdj]

Hi, it's possible to know if the USB is connected or not to T3.2?
I hope that it's possible to know for make a specific code if is connected to the USB or by battery.
Thank u
Dan

 

[PaulStoffregen]

If you edit the low-level USB code, you can detect whether the USB host has assigned an address and a configuration number.

 

[yeahtuna]

if (usb_configuration) {

}

 

[danixdj]

if (usb_configuration) {

}

Works fine but if i unplug the USB cable "if (usb_configuration)" stay true... it's possible to reset without power off?

 

[yeahtuna]

I'm not sure it this would work, but couldn't you read the voltage on the USB 5v when an analogRead?

 

[danixdj]

it’s perfect but is always true after the first plug of USB (computer, if it’s a power supply stay false).

It’s perfect but can’t recognise when is disconnected after the first connection..

 

[yeahtuna]

You will have to roll your own solution. Another thing I can think of would be to set a timer that periodically sends date to the host. If the function returns 0 bytes sent, you could likely infer that the connection was lost.

 

[MichaelMeissner]

I'm not sure it this would work, but couldn't you read the voltage on the USB 5v when an analogRead?

Depending on the Teensy, you would might need a voltage divider to bring the voltage down to 0..3.3v. You wouldn't need an analog read, a normal digital read would do.