An array of strings stored in flash with PROGMEM in Arduino

Question

I am using AVR-GCC version 4.7.0, and when I attempt to create an array of strings in FLASH memory I get the error:

variable ‘menu’ must be const in order to be put into read-only section by means of ‘attribute((progmem))’

I am using this code:

const char menu0[] PROGMEM = "choice0";
const char menu1[] PROGMEM = "choice1";
const char menu2[] PROGMEM = "choice2";
const char menu3[] PROGMEM = "choice3";
const char menu4[] PROGMEM = "choice4";
const char menu5[] PROGMEM = "choice5";

const char *menu[] PROGMEM = {menu0, menu1, menu2, menu3, menu4, menu5};

I have already read Stack Overflow question C - how to use PROGMEM to store and read char array, but all the answers I see don't include the const keyword which makes me believe that they were written before it was needed.

How does one fix this problem?

const char * const menu[] PROGMEM = {menu0, menu1, menu2, menu3, menu4, menu5};

was the answer.

Try this: const char * const menu[]...

imreal
– imreal

2013-01-14 19:48:58 +00:00
Commented Jan 14, 2013 at 19:48 — imreal
– imreal, Commented Jan 14, 2013 at 19:48

Some programmer dude · Accepted Answer · 2013-01-14 19:53:40Z

18

Try

const char* const menu[] PROGMEM...

Thus the array itself is constant, not a mutable array of const char* pointers, as it were in the original code.

edited Jan 14, 2013 at 19:53

Some programmer dude

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answered Jan 14, 2013 at 19:48

Anton Kovalenko

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1 Comment

Favil Orbedios Over a year ago

Yes, thank you. I actually just tried that, and was about to post the fact. Appreciations all around.

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