Compiler/CC1310: VerifyBuf overwrites global variable

Lasse Lundholm

Part Number: CC1310

Tool/software: TI C/C++ Compiler

Hi support

I have a program which loops through a task at a specifc interval. I have made a global variable while debugging to check how many times it has iterated through the loop.

Recently though, instead of counting up to 1 the first time it counts up to 61. This is due to the verifyBuf overflowing into it. What, when and how are this buffer filled?

I have difficulties finding out what the verifyBuf actually does and why it all of a sudden starts to overflow.

The program is simplified a CC1310 communicating with a MSP430 via I2C. A list of approx 30 struct containing the necessary data is run through a loop, which calls a function that handles the I2C communication.

It is during this that the verifBuf is written to.

This is the call stack.

The memory browser:

And the function in system.c that overwrites my variable

Hope this is enough info or please let me know

Regards

Lasse

over 5 years ago

0 daniel_o over 5 years ago

TI__Genius 10680 points

Lasse,

verifyBuf is part of the NV driver for external flash. Are you using the external flash on the CC1310 LaunchPad?

From the documentation:

The 'verifyBuf' and 'verifyBufSize' parameters are used by the NVS_write() command when either 'NVS_WRITE_PRE_VERIFY' or 'NVS_WRITE_POST_VERIFY' functions are requested in the 'flags' argument. The 'verifyBuf' is used to successively read back portions of the flash to compare with the data being written to it.

Are you using the NV driver?

Regards,

Daniel

0 Lasse Lundholm over 5 years ago in reply to daniel_o

Intellectual 280 points

Hi Daniel

I'm not aware of any deliberate use of any NV driver.

I have solved the issue, but still fail to understand why it came in the first place.

I found a printf call I used which was added at a point I had to run some unittests in a PC build of the code. Somewhere inside this printf call the verifyBuf was written to and overflowed into my globalcounter. I deleted the printf and it counts as intended again.

As I said I'm not sure why the error came. The printf has been there before at a time when the code ran without that issue.

Can you please link to where the documentation you mention is? I believe I have looked around but couldn't find it.

Regards

Lasse

0 daniel_o over 5 years ago in reply to Lasse Lundholm

TI__Genius 10680 points

Lasse,

I'm glad the issues are resolved.

The documentation I was referring to is available here: https://dev.ti.com/tirex/explore/content/simplelink_cc13x0_sdk_4_10_01_01/docs/tidrivers/doxygen/html/struct_n_v_s_s_p_i25_x___h_w_attrs.html

Regards,

Daniel

0 Lasse Lundholm over 5 years ago in reply to daniel_o

Intellectual 280 points

Thanks.

Will dive into the documentation and learn.

Another lesson learnt, which I should have learned before, is sleep on it and return to the problem the next day :-)

Thanks again.

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Compiler/CC1310: VerifyBuf overwrites global variable