void CDCNotificationHandler();
Checks for changes in DSR pin state and reports any changes to the USB host.
CDCInitEP() must have been called previously, prior to calling CDCNotificationHandler() for the first time.
This function is only implemented and needed when the USB_CDC_SUPPORT_DSR_REPORTING option has been enabled. If the function is enabled, it should be called periodically to sample the DSR pin and feed the information to the USB host. This can be done by calling CDCNotificationHandler() by itself, or, by calling CDCTxService() which also calls CDCNotificationHandler() internally, when appropriate.
MLA - USB Library Help Version : 2.16
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