Reading and writing the whole FRAM sometimes fails

[PatrickKa]

Description

Today (29.05.2025) I ran the whole FRAM test (build from 9825dd1) and most of the time it fails for one or two chunks of data. I don't know why this suddenly happens. Maybe there is something wrong with the FRAM, or maybe #397 helps.

[PatrickKa]

Unfortunately, using the correct SPI timings for the FRAM (#397) did not help. Further investigation showed, that sometimes reads fail, and sometimes writes. The addresses of the chunks that fail are also not equal, or similar.