Programming using I2C

VThan.2 · ‎2022-04-26

Hello all,

I have a design that is designed with a STM32. The SWDIO pin and SWCLK pin are pogo test points and difficult to solder wires to connect to the ST link programmer. The design has the BOOT0 pin pulled up to VDD. The I2C lines are the only way I can program the board. Once the board is programmed, can it be reprogrammed using the I2C lines for firmware development?

Thank you

Vignesh

TDK · ‎2022-04-26

Holding BOOT0 high during reset will cause the chip to boot into the bootloader at every reset, during which time you can reprogram it.

Unless you change option bytes to change the BOOT0 behavior, in which case you will lose this capability.

Use SWD for programming/development and save yourself the headache and lack of productivity caused by not having a debugger.

If you feel a post has answered your question, please click "Accept as Solution".

View solution in original post

TDK · ‎2022-04-26

Holding BOOT0 high during reset will cause the chip to boot into the bootloader at every reset, during which time you can reprogram it.

Unless you change option bytes to change the BOOT0 behavior, in which case you will lose this capability.

Use SWD for programming/development and save yourself the headache and lack of productivity caused by not having a debugger.

If you feel a post has answered your question, please click "Accept as Solution".

Andrew Neil · ‎2022-04-26

"The SWDIO pin and SWCLK pin are pogo test points and difficult to solder wires to"

Really?

Pads large enough for reliable pogo connection shouldn't be too hard to solder to...

Or make a pogo jig.

As @TDK suggests, the benefits of having SWD will far outweigh the effort in soldering ...

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

VThan.2 · ‎2022-04-26

Got it. Thank you very much.

Andrew Neil · ‎2022-04-27

Jolly good.

If your question is now resolved, please mark the solution:

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

VThan.2 · ‎2022-04-28

Hello @Andrew Neil , I had already marked it. Am I missing something?

TDK · ‎2022-04-28

Showed up as marked for me just now.

If you feel a post has answered your question, please click "Accept as Solution".

Andrew Neil · ‎2022-04-29

Seems you marked it after that post?

Anyhow, tis done now!

:thumbs_up:

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.