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# 2.9.3 Configuring the Library

The application designer must specify the following configuration parameters while using the Printer Function Driver. The configuration macros that implement these parameters must be located in the system_config.h file in the application project and a compiler include path (to point to the folder that contains this file) should be specified.

## Macros

Name | Description
USB_DEVICE_PRINTER_INSTANCES_NUMBER | Specifies the number of Printer instances.
USB_DEVICE_PRINTER_QUEUE_DEPTH_COMBINED | Specifies the combined queue size of all Printer instances.
Configuration on MCC | This section describes the symbols available in the MCC that can be configured.