USBDeviceTasks Function

void USBDeviceTasks();

This function is the main state machine of the USB device side stack. This function should be called periodically to receive and transmit packets through the stack. This function should be called preferably once every 100us during the enumeration process. After the enumeration process this function still needs to be called periodically to respond to various situations on the bus but is more relaxed in its time requirements. This function should also be called at least as fast as the OUT data expected from the PC. 

Typical usage:

void main(void)
{
    USBDeviceInit()
    while(1)
    {
        USBDeviceTasks();
        if((USBGetDeviceState() < CONFIGURED_STATE) ||
           (USBIsDeviceSuspended() == TRUE))
        {
            //Either the device is not configured or we are suspended
            //  so we don't want to do execute any application code
            continue;   //go back to the top of the while loop
        }
        else
        {
            //Otherwise we are free to run user application code.
            UserApplication();
        }
    }
}

None

This function should be called preferably once every 100us during the enumeration process. After the enumeration process this function still needs to be called periodically to respond to various situations on the bus but is more relaxed in its time requirements.