Compiler/CC2652R: Checking if NV item (ID) is occupied

Hamza Kadhum

Part Number: CC2652R
Other Parts Discussed in Thread: Z-STACK

Tool/software: TI C/C++ Compiler

Hi,

Is it possible to read NV id to see if it contain data?
I mean if we only do reading from NV id without any initializing from past, it will give some type of random values (mostly zeros?), and will have the data when we write to it.

This is what im trying to do;

osal_nv_read(ZCD_NV_PUBLIC_KEY_283, 0, PUBLIC_KEY_LENGTH, PublicKeyBuffer); <-- data in that nv id is written to publickeybuffer

OsalPort_memcmp(PublicKeyBuffer, tmp, sizeof(PublicKeyBuffer); <-- here I want to see if that publickeybuffer, nv, has been initialized before or empty..

To simply; Use Api to check if NV item contain useful data or has not been initialized yet.

Regards,
Hamza

over 5 years ago

0 YiKai Chen over 5 years ago

Guru 735695 points

According to my experience, you will read 0xFF when NV is never used.

0 Hamza Kadhum over 5 years ago in reply to YiKai Chen

Intellectual 945 points

Hi,

I dont think it does, when i read i get mostly 00s and some random numbers here and there...

It is currently working with some tricks but it would be much more safer and better if it was to read all 00s or FFs or something similar..

Missclicked solved my issue

Regards,
Hamza

0 Ryan Brown1 over 5 years ago in reply to Hamza Kadhum

TI__Guru**** 219707 points

Hi Hamza,

If the NV item in question has not been previously initialized then osal_nv_read returns a failed NV driver status code.

Regards,
Ryan

0 Hamza Kadhum over 5 years ago in reply to Ryan Brown1

Intellectual 945 points

Hi,

Thanks!

Regarding osal_nv_init ID, how is it supposed to be defined? I have added the new ID ZCD_NV_TMP_VAL as 0x1000 such that it is not overrun by other defined ID. But, it doesn't seem to work, the program doesn't execute properly..
This is my implementation

status = osal_nv_item_init( ZCD_NV_TMP_VAL, sizeof(tmpbuffer), tmpbuffer);
if( status == ZSUCCESS)
{
//Do something or skip?
}
else if (status == NV_ITEM_UNINIT ) //item did not existed and was created
{

//Write to item
osal_nv_write(ZCD_NV_TMP_VAL , sizeof(tmpbuffer), tmpbuffer);

}

return (status);

I think my lack of knowledge exists in how to properly define ID in NV and how to properly initialize it..

0 Ryan Brown1 over 5 years ago in reply to Hamza Kadhum

TI__Guru**** 219707 points

Hi Hamza,

I highly recommend that you initialize NV items as demonstrated in the Z-Stack UG and the doorlock example.

http://dev.ti.com/tirex/content/simplelink_cc13x2_26x2_sdk_3_40_00_02/docs/zigbee/html/zigbee/z-stack-overview.html#application-non-volatile-memory
http://dev.ti.com/tirex/explore/node?node=AOF4zzbmgbB3CPwTk2LxGA__pTTHBmu__LATEST

SYSID differentiates between stack and application NV items.

Regards,
Ryan

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Compiler/CC2652R: Checking if NV item (ID) is occupied