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USING THE ST7 USB LOW-SPEED LIBRARY V4.2x

4.1 SHARED VARIABLES

Here is a description of the variables shared between the USB Library and the Application

code layer :.

Variable

Declaration/

Aliases

Description

USBLibStatus

USB_Var.c

USB_Def.h

Used to exchange USB status information between the Library

and the Application. Possible values are :

PRODUCT1 (0x01) : always defined

PRODUCT2 (0x02) : alternate product

DFU_MODE (0x40) : DFU code loader device

APP_REQUEST (0x08) : set by Library when a non standard re-

quest has been received on EP0

USB_STALL (0x10) : set by Application to stall a non standard

request

USB_SUSPEND (0x20) : set by Library when suspended mode

is requested

USB_REMOTE_WAKEUP_ENABLE (0x40) : set by Library

when host enables the remote wakeup

USB_CONFIGURED (0x80) : set by Library when host config-

ured the peripheral

USBTransferStatus

USB_Var.c

USB_Var.h

Specifies the current Control Transfer transaction stages. Pos-

sible values are :

NO_DATA_STAGE (0x01) : an IN status will follow the setup to-

ken

DATA_STAGE_IN (0x02) : Transfer with IN data phase

DATA_STAGE_OUT (0x04) : Transfer with OUT data phase

ONE_MORE (0x08) : Last data IN transfer before status out

ADDRESS2SET (0x10) : device address

SET_TX0_VALID (0x20) : request to set EP0 Tx buffer to valid

SET_RX0_VALID (0x40) : request to set EP0 Rx buffer to valid

USBbmRequestType

USB_Var.c

USB_Var.h

Contains the characteristic of the request sent by the host. Re-

fer to USB spec ver 1.1, chap 9.3, page 183 for more informa-

tions. Possible values are :

RECIPIENT (0x03)

REDEVICE (0x00)

REINTERFACE (0x01)

REENDPOINT (0x02)