LAUNCHXL-CC1352R1: How to use RAM retention variable

Srinivasan S

Part Number: LAUNCHXL-CC1352R1
Other Parts Discussed in Thread: CC1352R, SYSCONFIG

Tool/software:

Could you please provide the step-by-step procedure for using RAM retention variables in a CC1352 microcontroller-based RTOS application?

My goal is to store certain data in RAM so that it persists until a hard reset occurs. I would like to avoid writing to flash memory frequently and instead retain this information in RAM.

It is very simple and straight forward in MSP430 MCU.

It will be great if you share some sample application to evaluate the RAM Retention feature.

1 month ago

0 Daniel Guarecuco Aguiar 29 days ago

TI__Intellectual 1510 points

Hi Srinivasan,

There is no RAM retention on shutdown on the CC1352R (section 9.4 of the datasheet : "System SRAM is always initialized to zeroes upon code execution from boot.")

However there is a 4-KB ultra-low leakage SRAM available for use with the Sensor Controller Engine which is typically used for storing Sensor Controller programs, data and configuration parameters. This RAM is also accessible by the system CPU. The Sensor Controller RAM is not cleared to zeroes between system resets, so if you are not using the Sensor Controller, you could use this section to preserve some data. Here is a guide RAM — SimpleLink CC13XX/CC26XX SDK BLE5-Stack User's Guide 2.2.11.00 documentation

It is also possible to create a NVS regions from SysConfig and use the NVS driver, here some more information NVS.h File Reference and the example project README.html

Best,

Daniel

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LAUNCHXL-CC1352R1: How to use RAM retention variable