store and retrieve array of chars in flash memory

Projects Programming
10

Who wrote MyString.h and MyString.cpp ?

I wrote this little lib, because when I started writing this scketch, I was not sure if the strlib commands were already integrated into the Arduino library. I have already taken the initiative to write my own commands. Also, when I created another sketch that involves many LCD printing functions, for some reason, which I did not debug, the sketch showed some bugs, and with my lib everything went well apparently. So I kept using my lib.

When we want to try your sketch, we need the latest version of all the files that you use.

MyString.h

#ifndef MyString_h
#define MyString_h
#include "Arduino.h"



class MyString {
	public:
		MyString();
		
		void
			put(char *buffer, const char *str),
			catenate(char *str0, const char *str1),
			catenate(char *str, const char chr),
			catenate(const char chr, char *str),
			put_P(char *buffer, const char *str),
			catenate_P(char *str0, const char *str1);
		
		private:
		
};



#endif

MyString.cpp

#include "Arduino.h"
#include "MyString.h"



MyString :: MyString() {

}



void MyString :: put(char *buffer, const char *str) {
	byte i; // counter;
	
	for(i = 0; str[i]; i++) buffer[i] = str[i];
	
	buffer[i] = '\0';
} 



void MyString :: catenate(char *str0, const char *str1) {
	byte i, j; // counters;
	
	for(i = 0; str0[i]; i++);
	
	for(j = 0; str1[j]; j++) str0[i + j] = str1[j];
	
	str0[i + j] = '\0';
} 



void MyString :: catenate(char *str, const char chr) {
	byte i; // counter;
	
	for (i = 0; str[i]; i++);
	
	str[i] = chr;
	str[i + 1] = '\0';
} 



void MyString :: catenate(const char chr, char *str) {
	byte i; // counter;
	
	for(i = 0; str[i]; i++);
	i++;
	
	for( ; i; i--) str[i] = str[i - 1];
	
	str[0] = chr;
}



void MyString :: put_P(char *buffer, const char *str) {
	byte i; // counter;
	
	for(i = 0; pgm_read_byte(str + i); i++) buffer[i] = pgm_read_byte(str + i);
	
	buffer[i] = '\0';
} 



void MyString :: catenate_P(char *str0, const char *str1) {
	byte i, j; // counters;
	
	for(i = 0; str0[i]; i++); // identifies the end of str0;
	
	for(j = 0; pgm_read_byte(str1 + j); j++)
		str0[i + j] = pgm_read_byte(str1 + j);
	
	str0[i + j] = '\0';
}

Are you sure that you have calculated the lastSTR properly ? Why strip the last element with "- 1" ?

The last concatenation of the for loop should be between the penultimate and last element of the STR []

You can start with something that works:

I'm beginning to understand the correct way to use the pgm_read commands. I am interpreting your suggested code as I reread the references. :wink: