USB device unplug identification?

[vanajagujjala]

Hello,

     I am using USB CDC class with MK20DX128VLH5, I am trying to identify the USB unplugging from the USB host device(PC),But i can't recognize it.Please any one help me how to identify USB unplugging from USB host device(PC) in the CDC class code.

Thanks,

vanaja.

[mjbcswitzerland]

Hi

When the cable is removed the device will detect a USB suspend state (>3ms idle line- (low speed D+ = 0, D- = 1 / high speed D+ = 1, D- = 0)).

See the SLEEP flag in the INT_STAT register.

Therefore the suspend interrupt can be used to detect this.

Regards

Mark

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[vanajagujjala]

Hi Mark

Thanks for your reply,

I will check it and get back to you,if any.

Thanks,

vanaja.

On Fri, Oct 30, 2015 at 7:37 PM, mjbcswitzerland <