UM0290 datasheet(37/76 Pages) STMICROELECTRONICS

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UM0290

Device firmware upgrade

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4.6

DFU implementation

4.6.1

DFU mode entry mechanism

For the STR7/9 devices the DFU mode is entered after an MCU reset if:

●

The DFU mode is forced by the user: the user presses the key push-button after a

reset.

4.6.2

Available DFU images in the STR7/9 USB development kit

The available DFU images in the STR7/9 USB development kit are:

●

Joystick Mouse Demo

●

Custom HID Demo

●

Mass Storage Demo (only for STR71x and STR91x)

●

Virtual COM Demo

●

Audio Speaker Demo

●

Audio Microphone demo (only for STR75x and STR91x)

4.6.3

How to create a DFU Image

DFU Image for STR7xx devices

To create a DFU image for STR7xx devices three steps are needed:

Create a binary image from one of the available applications by adjusting the ROM

base to the application address and remap the RAM to the address 0x0.

Remap the interrupt vectors to the first address of the RAM

Using the DFU file manager given with the DFU demo package, generate the DFU file

by setting target ID to 0 (internal Flash) and the starting the application address.

DFU Image for STR91x devices

To create a DFU image for STR91x devices two steps are needed:

Create a binary image from one of the available applications (c)

Using the DFU file manager given with the DFU demo package, generate the DFU file

by setting target ID to 0 (internal Flash) and the starting address to 0x0.

The STR7/9 USB Developer kit includes already a fully configured project examples to

demonstrate how to create a DFU image for each supported device with all the available tool

chains.

Remove all FMI initialization from the init file.

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