MSP430FR5994: How to preserve data on FRAM

You can store any kind of data you want in FRAM any time you want. Just like RAM. Then read it back when you want.

The details are up to you.

Can you provide an example

An example of what precisely? I have used FRAM for the heap in FreeRTOS and for dictionary space for eForth. Both are examples of very particular needs unlikely to match what you want to do. Which is still a mystery.

Yes. It could be better if you can provide me. Because I have never done that before, I don't know how to do it.

Hello Gaosheng,

The easiest way to do this is the create a large buffer variable and store it in FRAM.  Then you can just log your data there, and read it out later.  

The simplest way to do this is with #pragma PERSISTENT().  Here is an example variable used for some data logging for a recent project I was working on.  

#define PIR_DATALOGGING_LENGTH  1780

#pragma PERSISTENT( PIR_Inst_Detn_th_val )
uint32_t PIR_Inst_Detn_th_val[PIR_DATALOGGING_LENGTH] = {0};

After you build the project, you can find the exact memory location for this buffer in the .map file found in your projects debug folder.  

Hope this helps.

JD

Thank you very much

How to read from the reserved data from FRAM?

Uniflash is used for FLASH, is it useful for FRAM?

I have read data from memory, but I am not sure which data is FRAM, and which data is RAM/SRAM. Further, I am also not sure of the starting point of the data in the FRAM.