Is it correct behaviour of Dem module if it's saving for combined DTC (with immediate storage enabled) only snapshots and extended data? After power reset and read DTC I'm receiving status of DTC 0x50 but with occurence counter equal to one and with snapshot data. For not-combined DTCs status is different than 0x50. Is it correct?
Immediate storage of combined DTC - Dem AUTOSAR
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That behavior for sure is incorrect. State 0x50 indicates that DTC is not tested at all, but on the other side, you have stored data for one of the events mapped to this DTC. Below is your DTC status byte:
What we know:
I suggest to first check the status of the problematic DTC before reset. If we have in memory snapshot and/or extended data and a status byte which indicates a fail of the DTC, but after reset we have a status 0x50, than it means that the NvM block with the status byte is not triggered to be stored.
But if we also have a status 0x50 before reset, than it means that probably you have only problem with the configuration of DemEventMemoryEntryStorageTrigger.