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A colleague continued to look into this and found some other postings regarding memory not being accessible while some STM32L4x devices were in sleep mode. [SOLVED] SEGGER RTT - stm32 - erratic output when testing low power modes (WFI) - J-Link/Flasher related - SEGGER - Forum Once we turned off sleep mode his RTT issue and my issue were resolved.

I'll attempt to replicate with this project or, alternatively strip out all the IP from our project. I'll open a support ticket if I have to send you our project files.

This particular variable is a file scope static variable in a c file. It doesn't seem to make any difference if I am attempting to look at a variable in a c or cpp file, inside of not inside of a namespace. If the debugger is paused it always shows the expected value. This is a complicated project and it would be infeasible to strip out the IP or get it running on a dev board, unfortunately. I wondered if it might be due to some quirk in our ELF file or something non standard thing we are doing …

Hi, For a while a while (>1 year) I have had a problem where any data I put in the Data Sampling window or in the watched data window w/ refresh will intermittently read back as zero. For example, the attached plot should show a stable value followed by a sawtooth shade, but it shows the general shape with logs of "noise" where it bounces back to 0. I have confirmed that this is not not a plot rendering issue and the raw data shows the zeros as well. I can see a similar issue when I set data in …