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Configuration
9-3 CONFIGURATION
9-3-1 GENERAL CONFIGURATION
Some constants are available to customize the class. These constants are located in the USB
9
device configuration file, usbd_cfg.h . Table 9-4 shows their description.
Constant
USBD_HID_CFG_MAX_NBR_DEV
USBD_HID_CFG_MAX_NBR_CFG
USBD_HID_CFG_MAX_NBR_REPORT_ID
USBD_HID_CFG_MAX_NBR_REPORT_PUSHPOP
Description
Configures the maximum number of class instances. Unless you plan
on having multiple configurations or interfaces using different class
instances, this can be set to 1.
Configures the maximum number of configurations in which HID class
is used. Keep in mind that if you use a high-speed device, two
configurations will be built, one for full-speed and another for
high-speed.
Configures the maximum number of report IDs allowed in a report. The
value should be set properly to accommodate the number of report ID
to be used in the report. The minimum value is 1.
Configures the maximum number of Push and Pop items used in a
report. If the constant is set to 0, no Push and Pop items are present in
the report.
Table 9-4 HID Class Configuration Constants
The HID class uses an internal class to manage periodic input reports. The task priority and
stack size shown in Table 9-5 are defined in the application configuration file, app_cfg.h .
Refer to section 9-6 “Periodic Input Reports Task” on page 161 for more details about the
HID internal task.
Constant
USBD_HID_OS_CFG_TMR_TASK_PRIO
USBD_HID_OS_CFG_TMR_TASK_STK_SIZE
Description
Configures the priority of the HID periodic input reports task.
Configures the stack size of the HID periodic input reports task.
Table 9-5 HID Internal Task’s Configuration Constants
143
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