How much NVRAM space(bytes) is reserved for application in CC2538?

In Z-Stack, it is defined in CC2538.icf
NV_MEM = mem:[from 0x0027C800 to 0x0027F7FF];

Yes, this is NVRAM range in CC2538. But in ZComDef.h, many spaces are reserved for ZStack which we can not use them. I tried to use 720bytes from index 0x0401 stored in NVRAM, however, this caused Transport Key cannot be sent to our ZED. So I reduced this number to 500 bytes, then my ZED can finish joining cycle.

Thx!

For each osal_nv_write, you can write 255 bytes at most. You have to use four NV ID to keep 720 bytes.

If you have a look on function prototype of osal_nv_write, you would see the 3rd parameter is uint16 len which means you can use 255 bytes at most.

You are welcome.