Store configuration at SAMD11

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Hello,

 

i'm working at a touch controller which is based on samd11c14a, and i'm running out of flash, so i can't use the EEPROM lib. For my touch application i have to store 4x 32bit calibration values, my idea was to store them at the calibration and
auxiliary space or the AUX 1 NVM space. Another solution would be to store it at the serial number.

 

The goal would be to store the values persistent with as low flash usage as possible.

 

 

Does anyone have an idea what would be the best solution ?