C166: Constants in Specific Memory Areas

Information in this article applies to:

• C166 Version 4.24 or higher

QUESTION

I have a large pointer array for text constants. Here is a simplified example:

const unsigned char *text[]= { "text1", "text2", "text3", };

However, this text is allocated in NCONST (near) memory. I would like to have this text in other ROM spaces, for example in HCONST (huge), since there is no more space in my NCONST space.

How may I achieve that?

ANSWER

Just specify the correct memory type in your definition. For example:

unsigned char const huge *text[]= { "text1", "text2", "text3", };  // for HCONST
unsigned char const far *text[]= { "text1", "text2", "text3", };   // for FCONST

Note that this works only if you are using C166 Version 4.24 or higher.

To access such variables, you can use the following functions:

• For far space use fstrxxx and fmemxxx functions.
• For huge space use hstrxxx and hmemxxx functions.
• For xhuge space use xstrxxx and xmemxxx functions.

SEE ALSO

• C166: Locating Arrays of Strings in ROM

Last Reviewed: Thursday, February 25, 2021