USB bootloader serial number

[Uwe Bonnes]

Posted on February 20, 2017 at 12:37

Hello,

can the information be made available how the on-chip USB bootloader generates the serial number?

This would be helpfull when an application provides a DFU endpoint to jump to the built-in USB bootloader.  As long as the application  does not know how to generate the same serial number as the bootloader, the DFU application needs to know both serial numbers and both numbers need to be provides by the user.

Thanks

[Imen.D]

Posted on February 23, 2017 at 17:48

Hello

Bonnes.Uwe

‌,

The serial number is generated from the UID (3 words) of the chip combined as following:

• Sum of first and third words used

• Second word not modified

• Convert the first and second words into Char.

It will be better to provide more details about your casein order

to help you achieve your goal:

What you want to do ? Do you want

enumerate DFU from flash then jumps to Bootloader ?

Regards

Imen

[Uwe Bonnes]

Posted on February 24, 2017 at 16:02

 ,

 ,

Hello,

with appended code I can reproduce the Bootloader Serial for F3 and F4:

extern char serial_no[13],

♯ if defined(UID_BASE)

 ,

uint16_t *uid_base = (uint16_t *)UID_BASE,

 ,

sprintf(serial_no, '%04X%04X%04X', uid_base[1] + uid_base[5], uid_base[0] + uid_base[4],

 ,

♯ if defined(MCU_STM32F3)

 ,

 , , , uid_base[5]), /* 5 fits for F3*/

 ,

♯ else

 ,

 , , , uid_base[3]), /* 3 fits for F4*/

 ,

♯ endif

 ,

♯ else

 ,

serial_no[0] = 0,

 ,

♯ endif

It seems F3 and F4 have slight differences!

[alyoshin]

Posted on March 16, 2017 at 08:38

DFU serial number

STM32F2, STM32F4: 8 hex digits of (UID0 + UID2) followed by 4 hex MSB digits of (UID1)

UID 012: 002d0030 3334510b 32313533

SerialNumber: 325E35633334

STM32F3:                   8 hex digits of (UID0 + UID2) followed by 4 hex MSB digits of (UID2)

UID 012: 003b0041 50335706 20333333

SerialNumber: 206E33742033