CCS/MSP430G2744: What about ARRAY(s)?!

luigi Quaglia

Part Number: MSP430G2744

Tool/software: Code Composer Studio

GoodMorning everybody!

Here I am (again) because this time I have a particular problem with the definition of an array and I don't know how to solve it :(

I want to dedicate a part of RAM to a BUFFER that includes some FLAGS very important for my code.

The structure of what I have in my mind is something like this:

RAM

************************************************************************************************************************************************************************************************************************************************

BUFFER_EEPROM

FLAG_ATTIVAZIONI

NUMERO CICLI

TEMPI VARI

…

BLANCH_CHECK

OTHER VARIABLES IN RAM

……..

And what I did:

unsigned int BUFFER_EEPROM[25];

BUFFER_EEPROM[0]=FLAG_ATTIVAZIONI;

BUFFER_EEPROM[1]=NUMERO_CICLI;

BUFFER_EEPROM[6]=BLANCH_CHECK;

unsigned int *BUFFER_EEPROMinizio;

BUFFER_EEPROMinizio=&(BUFFER_EEPROM[0]);

But I only gets a lot of errors and warnings by Code Composer, so I suppose that I wrote something wrong.

Which is the best way to reserve some space of the RAM for specific variables in a particular order?

How can I do this?

What's wrong in my code?

I would really appreciate your help!

Thank you for the attention,

Kind Regards,

MariaAngela

over 7 years ago

0 Keith Barkley over 7 years ago

Guru 42085 points

What errors do you get? Everything looks good to me.

Is this code in a function or the global area? It needs to be in a function.

0 George Mock over 7 years ago

TI__Guru**** 249360 points

I think you can get most of what you want by applying the LOCATION pragma to the array BUFFER_EEPROM. Please search for LOCATION pragma in the MSP430 compiler manual.

If you still cannot resolve your other errors, then please submit a test case as described in the article How to Submit a Compiler Test Case.

Thanks and regards,

-George

0 luigi Quaglia over 7 years ago in reply to Keith Barkley

Expert 1155 points

Hi Keith!

Everything works well if I put the code in a function, it's true :)

So this is my mistake... But the array BUFFER_EEPROM is placed at the address 0x05CC which is almost at the end of the RAM...

Is there anyone who can explain me why? I really don't understand this strange behaviour.

Thank you for your answer!

Regards,

Maria Angela

0 luigi Quaglia over 7 years ago in reply to George Mock

Expert 1155 points

George, thank you for your answer!
I'm going to read the section dedicated to the LOCATION pragma and I'll try to use it to resolve also the problem of the wrong placement of my BUFFER_EEPROM. I want it at the start of the RAM, placed at 0x0200 address.
Can I use the #pragma inside a function, or have I to use it in the global area?
Thanks again,
Regards,
Maria Angela

0 George Mock over 7 years ago in reply to luigi Quaglia

TI__Guru**** 249360 points

luigi Quaglia said:
Can I use the #pragma inside a function, or have I to use it in the global area?

It can only be applied to global or static variables.

Thanks and regards,

-George

0 luigi Quaglia over 7 years ago in reply to George Mock

Expert 1155 points

Perfect, I'm going to try it now!

Thank you for the advice and the explanation.

Regards,

Maria Angela

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CCS/MSP430G2744: What about ARRAY(s)?!