AN2606 datasheet(29/155 Pages) STMICROELECTRONICS

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AN2606

STM32F105xx/107xx devices bootloader

154

•

The values of the vector table at the beginning of the bootloader code are different. The

user software (or via JTAG/SWD) reads 0x1FFFE945 at address 0x1FFFB004 for

bootloader V2.0 0x1FFFE9A1 for bootloader V2.1, and 0x1FFFE9C1 for bootloader

V2.2.

•

The DFU version is the following:

–

V2.1 in bootloader V2.1

–

V2.2 in bootloader V2.2.

It can be read through the bcdDevice field of the DFU Device Descriptor.

5.3.2

Bootloader unavailability on STM32F105xx/STM32F107xx devices

with a date code below 937

Description

The bootloader cannot be used if the USART1_RX (PA10), USART2_RX (PD6, remapped),

CAN2_Rx (PB5, remapped), OTG_FS_DM (PA11), and/or OTG_FS_DP (PA12) pin(s) are

held low or left floating during the bootloader activation phase.

The bootloader cannot be connected through CAN2 (remapped), DFU (OTG FS in Device

mode), USART1 or USART2 (remapped).

On 64-pin packages, the USART2_RX signal remapped PD6 pin is not available and it is

internally grounded. In this case, the bootloader cannot be used at all.

Workaround

•

For 64-pin packages

None. The bootloader cannot be used.

•

For 100-pin packages

Depending on the used peripheral, the pins for the unused peripherals have to be kept

at a high level during the bootloader activation phase as described below:

–

If USART1 is used to connect to the bootloader, PD6 and PB5 have to be kept at a

high level.

–

If USART2 is used to connect to the bootloader, PA10, PB5, PA11 and PA12 have

to be kept at a high level.

–

If CAN2 is used to connect to the bootloader, PA10, PD6, PA11 and PA12 have to

be kept at a high level.

–

If DFU is used to connect to the bootloader, PA10, PB5 and PD6 have to be kept

at a high level.

Note:

This limitation applies only to STM32F105xx and STM32F107xx devices with a date code

below 937. STM32F105xx and STM32F107xx devices with a date code higher or equal to

937 are not impacted. See STM32F105xx and STM32F107xx datasheets for where to find

the date code on the device marking.

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