AN1577 datasheet(21/30 Pages) STMICROELECTRONICS

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DEVICE FIRMWARE UPGRADE (DFU) IMPLEMENTATION IN ST7 USB DEVICES

4.4 OTHER DFU FUNCTIONS

These functions are not called by the Library. They are utility routines used during DFU

processing.

4.5 DFU VARIABLES

These variables are shared by the DFU kernel and the DFU protocol functions.

DFU_ManifestWaitReset_User

Called by the DFU_GetStatus function at the end of the

downloading phase. This function is used to write the End Of

Programming code in the last byte of Sector 1.

DFU_S1S2Valid

Used to check the integrity of Sectors 1 and 2. This is the first

function called by DFU_Main after Reset.

DFU_UpLoad_User

Called by the DFU_Upload function when a DFU_UPLOAD

request is received. Used to prepare and send the data to the

Host.

HDFlashProcess

Called by the DFU_Main function. This function manages the

call to all HDFlash routines.

VbusCheck

Used to check the presence of the Vbus when device is in

self-powered mode. This function is compiled if the

SELF_POWERED compilation variable is defined.

Table 6. LS Project Other DFU Functions

Function Name

Description

SetVpp12V

Used to set the Vpp voltage to 12V needed during erasing or

programming operations.

SetVpp5V

Used to set the Vpp Voltage to 5V when not erasing or pro-

gramming.

Table 5. LS Project DFU Call-back Functions

Function Name

Description

AN1577 Datasheet(PDF) 21 Page - STMicroelectronics