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Configuration
10-4 CONFIGURATION
10-4-1 GENERAL CONFIGURATION
There are various configuration constants necessary to customize the MSC device. These
constants are located in the usbd_cfg.h file. Table 10-4 shows a description of each
constant.
10
Constant
USBD_MSC_CFG_MAX_NBR_DEV
USBD_MSC_CFG_MAX_NBR_CFG
USBD_MSC_CFG_MAX_LUN
USBD_MSC_CFG_DATA_LEN
Description
Configures the maximum number of class instances. Unless you
plan having multiple configuration or interfaces using different
class instances, this should be set to 1.
Configures the maximum number of configuration in which MSC
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 logical units. This value must
be at least 1.
Configures the read/write data length in octets. The default value
set is 2048
Table 10-4 MSC Configuration Constants
Since MSC device relies on a task handler to implement the MSC protocol, this OS-task’s
priority and stack size constants need to be configured. These constants are summarized in
Table 10-5.
Constant
USBD_MSC_OS_CFG_TASK_PRIO
USBD_MSC_OS_CFG_TASK_STK_SIZE
Description
MSC task handler’s priority level. The priority level must be lower
(higher valued) than the start task and core task priorities.
MSC task handler’s stack size. Default value is set to 256.
Table 10-5 MSC OS-Task Handler Configuration Constants
173
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