char* string[] and PROGMEM [SOLVED]

Using Arduino Programming Questions
1

Hello,

I'm trying to store and read a char* array on progmem to save SRAM, I followed this article avr-libc: Data in Program Space but I can not retieve the content correctly

my code is like this:

char *string_table[] PROGMEM =
{
"String 1",
"String 2",
"String 3",
"String 4",
"String 5"
};

PGM_P string_table[] PROGMEM =
{
string_1,
string_2,
string_3,
string_4,
string_5
};

Serial.println(string_table[0]); //must print "String 1"
Serial.println(string_table[1]); //must print "String 2"
Serial.println(string_table[2]); //must print "String 3"
Serial.println(string_table[3]); //must print "String 4"
Serial.println(string_table[4]); //must print "String 5"

¿Can somebody help me?

Best regards and a lot of thanks in advance

2

Didn't the article you linked at the top of your page specifically warn you about that char pointer array? I think it did. Have a thorough read of your article.

3

tammytam:
Didn't the article you linked at the top of your page specifically warn you about that char pointer array? I think it did. Have a thorough read of your article.

Yes, but I don't inderstand how to retrieve and use as a normal char*.

4

Solved:

char buffer[10];
strcpy_P(buffer,(PGM_P)pgm_read_word(&(tring_table[0]))); //Read first string
Serial.println(buffer); //Print "String 1"
5

Also see Gammon Forum : Electronics : Microprocessors : Putting constant data into program memory (PROGMEM)

6