Debugger broken in versions 18.0.0+

[Zachary-Norris]

Hello, I noticed the debugger gets stuck in Infinite_Loop before even reaching the main() function in versions 18.0.0+ (my testing shows the debugger working in prior versions such as 17.6.0). The issue persists when tested with the default platformio project.

Pausing the debugger shows that the code gets stuck in this default handler Infinite_Loop.

Stepping through the code from the beginning I found this call to be the culprit:

As mentioned, this issue persists even with the above default project.

Here is the configuration of my platformio.ini file:

[env:stm32]
platform = ststm32@18.0.0
board = genericSTM32H750VB
framework = arduino
upload_protocol = stlink
debug_tool = stlink

I am using stlink version 3 with the latest firmware. I'm not sure if regularly uploaded code (non-debugger) is also broken or just when using the debugger as I haven't gotten that far.

[valeros]

Hi @Zachary-Norris, thanks for reaching out. Maybe the size of RAM is set incorrectly for this board. Could you try adjusting it to 524288? For example:

[env:stm32]
platform = ststm32@18.0.0
board = genericSTM32H750VB
framework = arduino
upload_protocol = stlink
debug_tool = stlink

; Fix  the RAM size
board_upload.maximum_ram_size = 524288

Then clean and debug your project again.

[Zachary-Norris]

Hi @valeros - yeah, that worked.

For my clarity, why does RAM need to be set to 512MB? The datasheet calls out 1MB of RAM for this microcontroller.

[valeros]

The 1MB RAM in the STM32H750VB is not a single continuous block but is split into multiple memory regions. In our case we need a 512KB chunk of general-purpose AXI-SRAM. The rest of the RAM is divided among DTCM-RAM, ITCM-RAM, etc, each with different sizes and intended uses.