RTOS/CC1310: NVS Delete Issue

kim hanbeom

Expert 1395 points

Part Number: CC1312R

Tool/software: TI-RTOS

We are currently developing a custom board using CC1312 as a chip.

I use nvs in my project and I repeat writing as a periodic event.

However, when I turned the power off and on, I occasionally saw that the data of nvs was deleted.

NVS usage refers to the sdk example (nvsinteral). (Using NVS_erase() / NVS_write())

Here is the question.

1. If power is turned off / on while using nvs, will all data of nvs be deleted?

2. Is there a way to protect nvs data even on sudden power off / on?

(Is NVS_lock () / NVS_unlock () used for nvs data protection?)

Thanks.

over 6 years ago

0 IUsedToBeARealPerson (M-W) over 6 years ago

TI__Guru 58425 points

Hi Kim,

If the NVS_write() calls also include erase (to rewrite data) then you could potentially lose the data if experiencing a sudden power shortage during this period. NVS_lock/unlock does not protect against this, it's to protect the operation on an application layer.

One solution to this if you still have free flash space is to keep a shadow copy of the previous data. An example is having a region A and B and alternate between these so that you always have a "copy" of the previous data.

0 kim hanbeom over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Expert 1395 points

Thank you for your kind reply.

0 kim hanbeom over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Expert 1395 points

I have a two more question.

1. Can I go ahead and use two sectors of one region instead of two regions?

(Will using two sectors solve the problem?)

2. Could you give me an example that uses two regions?

(The 1312 SDK example (nvsinternal) does not tell me how to use the two regions.)

(I referenced the link below, but I do not know how to set it up.)

Thanks.

0 kim hanbeom over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Expert 1395 points

I wrote the following code and built it.

However, there is an Error.

What's the problem?

Thanks.

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to kim hanbeom

TI__Guru 58425 points

Hi Kim,

Yes, you could simply extend one Region to cover two sections. There are no examples available that does this today I'm afraid.

Regarding your linking error, I would expect this to be because you are conflicting with the CCFG region that is located at the last flash page. When using the flash to store data you should avoid this last flash page as it contains configuration parameters that could potentially brick your device if you are not careful.

0 kim hanbeom over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Expert 1395 points

I changed the value of NVS_REGION2_BASE as shown below, and the build succeeded.

Is there a problem when using it?

0 kim hanbeom over 6 years ago

Expert 1395 points

Part Number: CC1312R

Tool/software: TI-RTOS

I attached the previous question below.

1. How do I fix it to eliminate the error?

2. How many regions are there in nvs and where can I find information about each size and address?

Thanks.

0 kim hanbeom over 6 years ago

Expert 1395 points

I changed the value of NVS_REGION2_BASE as shown below, and the build succeeded.

Is there a problem when using it?

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to kim hanbeom

TI__Guru 58425 points

Hi,

There should be no problem using your region based on the settings from your other thread. As it is the same question, I will merge the two thread.

Please try to avoid splitting an active thread as this makes it harder for us to support and for community members to find when searching.

0 kim hanbeom over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Expert 1395 points

I am wondering how the NVS Flash address is assigned.

Where can I find out?

(I am wondering about the base address of each REGION and the address of the sector.)

Thanks.

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to kim hanbeom

TI__Guru 58425 points

Are you referring to 0x40000 and 0x48000? If so, this base is simply the address to the start of a region (which in this case is the start of a flash page, convenient!).

In CC1312, you have 352 kB of flash (available), as each page is 8192 B big, this would mean you have 42 flash pages. The base address 0x48000 means you are using/reserving page 36-39 (0x48000 - 0x50000) for your NVS region. You would calculate your second region size in the same way.

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RTOS/CC1310: NVS Delete Issue