CC2652R7: How to define noinit ram

Kenneth Thomas

Part Number: CC2652R7

Tool/software:

Hello,

I was wondering how to define a noinit section of ram that is persistent through a soft reboot. So far I've defined a section of ram to noinit in the linker file and then used the attribute to place the object in that section of ram. I see in the map file that it is being placed there however when I do a sysreset the value looks like its resetting back to 0 even though I am incrementing it on each boot up. Below I attached the edits to the .cmd file the project is using project_zero as the base.

 * Memory Sizes
 */
 
 #define NOINIT_SIZE  0x00001000
 
 
 
 
 
 /*******************************************************************************
 * Memory Definitions
 ******************************************************************************/

/*******************************************************************************
 * RAM
 */
 #define NOINIT_START      (RAM_END - NOINIT_SIZE)





 /*******************************************************************************
 * System Memory Map
 ******************************************************************************/
MEMORY
{
 
   SRAM (RWX) : origin = RAM_START, length = (RAM_END - NOINIT_SIZE - RAM_START + 1)
  NOINIT (RWX) : origin = RAM_END - NOINIT_SIZE + 1, length = NOINIT_SIZE
  
  
/*******************************************************************************
 * Section Allocation in Memory
 ******************************************************************************/
SECTIONS
{
  
  .noinit (NOLOAD):
  {
    *(.noinit)
  } > NOINIT

Thanks

6 months ago

0 Alex Fager 6 months ago

TI__Genius 12391 points

Hello Kenneth,

I hope you are doing well. I wanted to see if you have already read our Ram section in the SDK: RAM — SimpleLink CC13XX/CC26XX SDK BLE5-Stack User's Guide 2.2.11.00 documentation.

The .cmd file may be auto generated which would reset any changes we make.

A similar E2E thread discussion: e2e.ti.com/.../

Thanks,
Alex F

0 Kenneth Thomas 6 months ago in reply to Alex Fager

Prodigy 250 points

Hey Alex,

I did look at the user's guide section on RAM and there was nothing about creating a noinit section of RAM. I checked the .map file and it shows that the section I created in the .cmd file is there and the variable I am putting there is taking up space. I read through the thread discussion you sent earlier and I'm using the TI Clang compiler instead of the IAR but still at the end of the thread the user was told to look for an answer from IAR support.

Thanks,
Kenneth T

0 Alex Fager 6 months ago in reply to Kenneth Thomas

TI__Genius 12391 points

Hello Kenneth,

The following e2e seems to discuss similar topics of using persistent ram:

https://e2e.ti.com/f/1/t/1217324/

There is also AUX RAM:

Using the AUX RAM as RAM — SimpleLink CC13x0 SDK Proprietary RF User's Guide 2.60.0 documentation

Thanks,
Alex F

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CC2652R7: How to define noinit ram