CC2640R2F: How Can I fill up the unused Flash / ROM in CC2640?

Nidhal Ben Othmen23

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640

Hello all,

I am working in a project using the CC2640 as a BLE network processor communicating via HCI through UART with another MCU.

I developed my project based on host application example for BLE Stack 4.2. I am using IAR 8.22.2 and its compiler.

For quality/security reasons, I have to fill up the unused Flash / ROM.

I found in IAR user guide that I can fill up the Flash as mentioned in the picture below.

My 2 questions are:

- What I have to put as "Fill pattern" to cause a chip reset when it happens that the application fills unused memory while it is running?

- How Can I fill up the unused Flash (0x00000000..0x0001FFFF) and ROM (0x10000000..0x1001EFFF) using IAR project options?

Please could you help me?

Thanks a lot!

over 6 years ago

0 J Lindh over 6 years ago

TI__Guru 57865 points

Hi Nidhal,

Assigning this internally for follow-up. Stay tuned.

0 Aslak N. over 6 years ago

TI__Mastermind 23440 points

Hi,

This is how you fill the flash. The ROM cannot be filled. It's already written and is Read Only.

You will not get a chip reset automatically regardless of what the memory is filled with, but you can get an exception, and you can perform a reset in the exception handler or you can enable the watchdog, in which case the default exception handler (spinning) would cause a wdt reset.

Trying to execute instructions from memory filled with 0xFF will cause an exception / Usage Fault: UNDEFINSTR

Best regards,
Aslak

0 Nidhal Ben Othmen23 over 6 years ago in reply to Aslak N.

Prodigy 20 points

Hi all,

Thanks a lot Aslak N. for the reply. I found this exception catched in Hwi_excUsageFault() in Hwi.c.

How can I use this HW interrupt in my application without editing the Hwi.c file?

Do you have an example using that?

Thanks & Best Regards,

0 Aslak N. over 6 years ago in reply to Nidhal Ben Othmen23

TI__Mastermind 23440 points

Hi,

Yes, you could look at the m3Hwi module in the documentation, for how to install your own hook.

* http://dev.ti.com/tirex/explore/node?node=AFPmWIIJheKraaKGbrstpw__krol.2c__LATEST -> ti/family/arm/m3/hwi

Basically it's put m3Hwi.excHookFunc = "&yourHandler"; Where the signature is void yourHandler(Hwi_ExcContext *ctx); into the .cfg file.

Best regards,
Aslak

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CC2640R2F: How Can I fill up the unused Flash / ROM in CC2640?