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Chapter 10
10-4-2 CLASS INSTANCE CONFIGURATION
Before starting the communication phase, your application needs to initialize and configure
the class to suit its needs. Table 10-6 summarizes the initialization functions provided by the
MSC implementation. Please refer to section E-1 “Mass Storage Class Functions” on page 420
10
for a full listing of the MSC API.
.
Function name
USBD_MSC_Init()
USBD_MSC_Add()
USBD_MSC_CfgAdd()
USBD_MSC_LunAdd()
Operation
Initializes MSC internal structures and variables.
Adds a new instance of the MSC.
Adds existing MSC instance into USB device configuration.
Adds a LUN to the MSC interface.
Table 10-6 Class Instance API Functions
To successfully initialize the MSC, you need to follow these steps:
1
Call USBD_MSC_Init()
This is the first function you should call, and it should be called only once regardless of
the number of class instances you intend to have. This function will initialize all internal
structures and variables that the class will need. It will also initialize the real-time
operating system (RTOS) layer.
2
Call USBD_MSC_Add()
This function will add a new instance of the MSC.
3
Call USBD_MSC_CfgAdd()
Once the class instance is correctly configured and initialized, you will need to add it to
a USB configuration. High speed devices will build two separate configurations, one for
full speed and one for high speed by calling USBD_MSC_CfgAdd() for each speed
configuration.
174
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