Dataset is written into Flash automatically?

[Kostiantyn Makhno]

Hi there, I use the openthread and  I have some observation: when I at first turn on the MCU I generate random network parameters with otDatasetCreateNewNetwork(), when I reset the MCU these parameters is same. I think that they write into flash memory. Does anybody have any idea?

P.S Also I use otDatasetIsCommissioned(), and I a little bit confused with it. I read about active dataset and pending dataset in Thread spec but it's so hard. Can anyone explain about it? Thanks.

[Kostiantyn Makhno]

I use memcheck and that's really write some network parameters into Flash 

[Kostiantyn Makhno]

also, every time when I reset MCU it saves into Flash the same network parameter, i.e. if I want to save some data into flash I allocate some memory by i.e. 0xff000 address, my flash section starts with i.e. 0xfc000 address and if I do large number of reset, my section with my data rewrite by parameters that saves thread. Is it bug or feature?

[Marjeris Romero]

Hi Kostiantyn,

The network settings will be stored on non-volatile memory, see the OpenThread stack memory layout here. The OpenThread stack persistent storage starts at address 0x00fc in nRF52840, so if you want to save application data you need to do it outside of the persistent storage area.

If you want to erase the network settings you can use otInstanceErasePersistentInfo().

Best regards,

Marjeris

[Kostiantyn Makhno]

thanks, I got it. But when I use FDS and store some data into Flash, it saves data in the region of memory 0xfc000-0x100000 but it's wrong. Why does it happen?

[Kostiantyn Makhno]

and also it can write network setting by 0xfe000