USART Bootloader get checksum command doesn't work

[crisay794266]

Hello,

I am using the STM32G070RB and can start the bootloader. I am sending the command get checksum 0xA1 + 0x5E but I receive a NACK Byte directly after that. So I assume that this has to do with the protection active, since the flow diagram in the AN3155 shows only this path.

So in order to fix this issue I was thinking to send the readout unprotect command first and then the get checksum command. I did this but it doesn't work either.

Please note that I pull the Boot0 Pin high again an I am able to start the bootloader again after the reset caused by readout unprotect command.

Any help would be appreciated

[STea]

Hello @crisay794266 ,

Can you precise the bootloader version of MCU this can be done by checking the bottom right window when connecting via CubeProgrammer.
Regards 

[crisay794266]

It is 0xB2

[TDK]

Run the GET COMMAND command to see if the get checksum command is supported.

I recall them leaving out some commands due to space on the smaller chips.

[Tesla DeLorean]

Presumably if you unprotect the memory, it will mass-erase the content, so not going to be helpful to checksum content.

As TDK indicates you should be able to get the loader to enumerate the supported commands.