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MSP430G2553 write Info memory at flash time

Chris Hatz
Prodigy 60 points

I want to write some values in information memory when microcontroller is programmed. Tried

#pragma DATA_SECTION (var, ".infoD")
const int var = 0;

and 

#pragma location=0x1000
const int var = 0;

but I did not succed. Any ideas?

I am using CCS v6 and TI compiler v4.4.2

Thanks in advance.

  • 0
    Guru 58965 points
    Flash memory (including the Info Flash) is somewhat like ROM. Normally you cannot write into it. You have to setup the Flash Controller registers before you can Erase or Write Flash memory. This is described in the User's Guide. And there are code examples.
  • 0 in reply to old_cow_yellow
    Prodigy 60 points

    Yes, I am aware of this.

    But if I manually edit the generated TI-TXT file and place for example 

    @1000
01 02 03

    at the top of the file, data are actually written at that specific memory location.

    So is there a way to do that in another way instead of manually editing the TXT file?

  • 0 in reply to Chris Hatz
    Guru 58965 points
    When you use PC to generate that TI-TXT file, the MSP430G2552 on your LP is totally unaware of it. Subsequently, you have to use some MSP430 development tool, such as CCS, to read that PC file, understand what it means, and write those bytes into the Flash memory of the MSP430 chip. CCS is designed to do so and will utilize the Flash Controller on the MSP430 to accomplish that task.
    On the other hand, when you write your own source code, CCS will translate that into object code, put the object code into the MSP430, and run it. Your code is on the driver’s seat. If your code does not utilize the Flash Controller, it will not be able to change the Flash memory.
  • 0 in reply to Chris Hatz
    Guru 23000 points
    The CCS compiler treated 'DATA_SECTION' as a normal Read/Write RAM segment and will during boot try to write the '0' to InfoD, in what it will not succeed.
    Change DATA_SECTION into CODE_SECTION.
  • 0 in reply to Leo Bosch
    Guru 58965 points
    Chris,

    I misunderstood you. I thought you want to write code to do it. Leo is right. CCS could do it for you at download time before your code is running.

    --OCY
  • 0 in reply to old_cow_yellow
    Prodigy 60 points

    Found the solution. 

    The very first code I wrote was correct with one change. Compiler was optimizing the code so I added volatile at variable.

    #pragma DATA_SECTION (var, ".infoD")
volatile const int var = 0;

    Thank you both for your time. :)

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