UM0290 datasheet(17/76 Pages) STMICROELECTRONICS

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UM0290

STR7/STR9 USB firmware library

17/76

Device Property Structure: The USB core dispatches the control to the user program

whenever it is necessary. User handling procedures are given in an array of

Device_Property. The structure has the type: DEVICE_PROP:

typedef struct _DEVICE_PROP {

void (*Init)(void);

void (*Reset)(void);

void (*Process_Status_IN)(void);

void (*Process_Status_OUT)(void);

RESULT (*Class_Data_Setup)(u8 RequestNo);

RESULT (*Class_NoData_Setup)(u8 RequestNo);

RESULT

(*Class_Get_Interface_Setting)(u8 Interface,u8

AlternateSetting);

u8* (*GetDeviceDescriptor)(u16 Length);

u8* (*GetConfigDescriptor)(u16 Length);

u8* (*GetStringDescriptor)(u16 Length);

u8 MaxPacketSize;

} DEVICE_PROP;

User Standard Request Structure: The User Standard Request Structure is the

interface between the user code and the management of the standard request. The

structure has the type: USER_STANDARD_REQUESTS:

typedef struct _USER_STANDARD_REQUESTS {

void(*User_GetConfiguration)(void);

void(*User_SetConfiguration)(void);

void(*User_GetInterface)(void);

void(*User_SetInterface)(void);

void(*User_GetStatus)(void);

void(*User_ClearFeature)(void);

void(*User_SetEndPointFeature)(void);

void(*User_SetDeviceFeature)(void);

void(*User_SetDeviceAddress)(void);

} USER_STANDARD_REQUESTS;

If the user wants to implement specific code after receiving a standard USB request he

has to use the corresponding functions in this structure.

An application developer must implement tree structures having the DEVICE_PROP,

Device_Table and USER_STANDARD_REQUEST types in order to manage class

requests and application specific controls. The different fields of these structures are

described in the next section.

1.3

Application interface

The modules of the Application interface are provided as a template, they must be tailored

by the application developer for each application. Table 3 shows the different modules used

in the application interface.

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