While debugging, cannot access registers about arduino_core_stm32 HOT 8 CLOSED

You have to add svd file using debug_custon.json file. See the forum to know how to write json file.

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I created a custom_debug.json with contents

{
    "svdFile": "C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\SVD\STM32L4R5.svd"
}

in the sketch folder, but that did not work.

Then I changed the json to

{
    "svdFile": "STM32L4R5.svd"
}

and copied STM32L4R5.svd into the sketch folder, but it still does not work.

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I also tried using different slashes for the path, no luck either ...

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In fact since IDE 2.3.x, the debug has been reworked by Arduino.
I'm currently working to support the new way to support debug svd files.

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For ref: arduino/arduino-ide#1920

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I downgraded to 2.0.3 but I still don't get access to peripheral registers
So clearly, I am still doing something wrong :/

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Oh my...
Just realized that you don't have to manualy create a watch expression, but that there is a complete peripheral register viewer...

...and for those who use sloeber
you can specify a svd-file to use in the debug launch configuration:

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Here a way to get the svd properly load within Arduino IDE 2.3.2:
In the boards.txt add this line to the board entry you want:

Example for Nucleo L496ZG-P
Nucleo_144.menu.pnum.NUCLEO_L496ZG-P.debug.svd_file=C:\\ST\STM32CubeCLT_1.15.0\\STMicroelectronics_CMSIS_SVD\\STM32L4x6.svd

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