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# Device Layer Task Routines

A call to the USB_DEVICE_Tasks() function should be placed in the SYS_Tasks() function. This will ensure that this function is called periodically. The USB_DEVICE_Tasks() function in turn calls the tasks routines of the applicable functions drivers. The following code shows an example of how the USB_DEVICE_Tasks() function is called in the SYS_Tasks() function.

    void SYS_Tasks ( void )
    {
        /* Device layer tasks routine. Function Driver tasks gets called
         * from device layer tasks */

        USB_DEVICE_Tasks(sysObjects.usbDevObject);

        /* Call the application's tasks routine */
        APP_Tasks ();
    }