RTOS/CC2640: Using the SNV Flash to Store Bytes

Kevin C

Part Number: CC2640

Tool/software: TI-RTOS

Hello,

I am looking to use the SNV Flash pages on the cc2640 to store a series of bytes. I have read through some of the documentation on the SNV Flash storage but I've yet to fully grasp it.

http://www.ti.com/lit/ug/swru393e/swru393e.pdf

http://dev.ti.com/tirex/content/simplelink_cc2640r2_sdk_1_40_00_45/docs/blestack/ble_user_guide/html/cc2640/memory_management.html

Basically, I am attempting to store a bytes of data when a bluetooth connection is lost. Instead of sending the data off via bluetooth, it would save it to the SNV. Once the connection is reestablished, the SNV can be read.

I Imagine the SNV code to look similar to this:

//Connection lost

osal_snv_write(0x80, 1, (uint8 *)writebuf);

// Connection reestablished

storestatus = osal_snv_read(0x80, 1, (uint8 *)readbuf);

if (storestatus = read_success )

{
DATA_SEND = readbuf[0];
}

However when I run the above pseudo-code, I am only seeing the latest data written to the SNV at the 0x80 ID.

Is it possible to write individual bytes to an ID and iterate through the values, or do i have to write them in a large (255 bytes) array? (One large Array per ID)

Thanks,

Kevin

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735695 points

Try to refer to sunmaysky.blogspot.com/.../how-to-create-new-task-in-ti-rtos-to.html

0 David Rubie over 7 years ago

Expert 1690 points

Kevin, there is no point trying to stream individual bytes into the flash memory, just use an array. The recommendation (from memory) is to statically allocate an array somewhere you use to put your data in, then call osal_snv_write with a pointer to the array. If you need to do any byte streaming / buffering, exactly how much data do you need to store?

0 Kevin C over 7 years ago in reply to David Rubie

Prodigy 100 points

There isn't a ton of data to store, only 3-4 bytes per sample. I've decided to just use a statically allocated array as you have suggested and I will iterate through the 16 ID's as needed. (depending on the sampling rate/connection loss timing)

Thanks for your time.

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RTOS/CC2640: Using the SNV Flash to Store Bytes