3.2.3 Configuring the Library
The following configuration parameters must be defined while using the USB Host Layer.
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_HOST_CONTROLLERS_NUMBER | Defines the number of USB Host Controllers that this Host Layer must manage. |
| USB_HOST_DEVICE_INTERFACES_NUMBER | Defines the maximum number of interface that the attached device can contain in order for the USB Host Layer to process the device. |
| USB_HOST_DEVICES_NUMBER | Defines the maximum number of devices to support. |
| USB_HOST_HUB_SUPPORT_ENABLE | Defines if this USB Host application must support a Hub. |
| USB_HOST_HUB_TIER_LEVEL | Defines the maximum tier of connected hubs to be supported. |
| USB_HOST_PIPES_NUMBER | Defines the maximum number of pipes that the application will need. |
| USB_HOST_TRANSFERS_NUMBER | Defines the maximum number of transfers that host layer should handle. |
| Configuration on MCC | This section describes the symbols available in the MCC that can be configured. |