topic Re: EEPROM emulator on MPC57xx in MPC5xxx

EEPROM emulator on MPC57xx

Osabry — Sun, 30 Apr 2023 10:31:11 GMT

I am trying to use the EEPROM driver and I couldn't fully understand what does the "dataID" variable represents, I am using it to access different records but it keeps accessing the same record regardless the "dataID" value I pass to the read/write/erase functions !! I would like to ask also if I could select the partition I am accessing ?

Re: EEPROM emulator on MPC57xx

davidtosenovjan — Wed, 03 May 2023 11:30:24 GMT

I could recommend to see following aponote what will help you to understand how EEPROM emulation works:
https://www.nxp.com/docs/en/application-note/AN4868.pdf

EEPROM emulation driver basically spreads programmed data content over the whole data flash in order to prevent wearing out of particular flash portions. Otherwise endurance limit (number of program/erase cycles) would be early achieved and data content could be damaged. So you dont choose specific place where data are being stored, but the driver takes care of it.

Re: EEPROM emulator on MPC57xx

Osabry — Sun, 07 May 2023 15:45:28 GMT

I've read this document and the problem persists, I am accessing the same record whatever "dataID" value I am passing to the read/write functions. what would be the reason for that doesn't the "dataID" variable represent the record number ?

Re: EEPROM emulator on MPC57xx

Osabry — Sun, 28 May 2023 15:05:32 GMT

@davidtosenovjan I have further debugged it and I found that any record access returns a status of invalid (0xFFFF0000) which I couldn't understand is there some sort of initialization for the records I am missing, however I am using an example. the invalid status is returned through the "record" struct variable "dataStatus" highlighted in the attached image.