STM32 builtin bootloader GO command problem

[KlemenDS]

Hi,

I am trying to set up bootloader on my STM32G030, via usart. 

When I enter it and send start command (0x7F) I do get ACK response(0x79). I cna read ID and protocol verions, but when I try do use "Go" command to start my application, it gets stuck.

What I am sending and responses I get from bootlaoder:

Send:  0x7F    (start)

Response: 0x79

Send:  0x21    0xDE    (go command)

Response: 0x79

Send:  0x0800004 0x04 (my application program is at address 0x08000000) (0x04 is length of address in bytes for checksum)

Response: nothing

I assume I am doing something wrong with checksum value, but I cant figure out what.

[liaifat85 · Accepted solution]

You can try the following sequence instead:

1. Send 0x21 (Go command)
2. Send 0xDE (Checksum for the Go command)
3. Send 0x08 0x00 0x00 0x00 (Address bytes)
4. Send 0x08 (Checksum for the address bytes)

[KlemenDS]

Ok @liaifat85  , with this command procedure I get ACK after checksum. But my application is not starting after it. One of functions in my APP is that it repondes to a uart query (I send ID, it reponds with SYS). It know it works, because if I disable bootlaoder, and it goes straight in the APP, it works.

Might there be a problem with my address?

This is screen of STMcubeprogrammer:

After checking with debugger, after the bootlaoder "GO command" the program flow gets to main.c(set breakpoint at HAL_Init(); ), so there is some other problem with main APP not really working. Thank for your help.