What I2C device address to use for STM32 slave bootloader?

[FrankNatoli]

AN2606, page 268, for STM32H7B3I I2C bootloader, says "Slave 7-bit address: 0b10101111x

(where x = 0 for write and x = 1 for read)".

Unfortunately, "10101111" is eight not seven bits.

I have two STM32H7B3I EVAL systems successfully communicating via I2C, 7-bit addressing, where each device is identified by a 7-bit value which is left shifted one bit before calling HAL_I2C_Master_***_IT functions.

AN4221, which details the I2C slave bootloader protocol, says "The I2C slave address for each product bootloader is specified in the AN2606".

What is the correct 7-bit address to use?

[Tesla DeLorean]

You can probably try quicker than you'll get an official answer..

Could also disassemble the loader.

Likely (0xAE, 0x57 << 1)

0b1010111x

What version? 53 is what's up today, pg 274

https://www.st.com/resource/en/application_note/cd00167594-stm32-microcontroller-system-memory-boot-mode-stmicroelectronics.pdf

[FrankNatoli]

Well, prior to your suggestion, I had tried both 0xAF and 0xAE, and regrettably both timed out, i.e., HAL_I2C_Master_Transmit_IT was "successful" but never resulted in a transmit complete callback.

Thus I infer that the I2C slave, powered up with SW1=ON, did not choose to accept data at 0xAF or 0xAE.

Am presently connecting a logic analyzer to the I2C signals to document what is happening.

[MM..1]

Primary you need use concrete pins , cant alternate, for example I2C1 only on PB6 PB9