- Fri May 15, 2015 8:44 am
#17465
I haven't compiled this into a library yet or setup a github project, but I wrote some functions to make it easier to save code into eeprom. Instead of allocating a random amount of memory space for each variable saved into eeprom, i made a set of functions that will dynamically expand/contract the memory used for each variable. Basically it works similar to a URL encoding, storing the variable names and values in eeprom separated by & and =. It's a work in progress, but if anyone is struggling with using eeprom, give this a shot.
Code: Select all
void eepromSet(String name, String value){
Serial.println("eepromSet");
String list=eepromDelete(name);
String nameValue="&" + name + "=" + value;
//Serial.println(list);
//Serial.println(nameValue);
list+=nameValue;
for (int i = 0; i < list.length(); ++i){
EEPROM.write(i,list.charAt(i));
}
EEPROM.commit();
Serial.print(name);
Serial.print(":");
Serial.println(value);
}
String eepromDelete(String name){
Serial.println("eepromDelete");
int nameOfValue;
String currentName="";
String currentValue="";
int foundIt=0;
char letter;
String newList="";
for (int i = 0; i < 512; ++i){
letter= char(EEPROM.read(i));
if (letter=='\n'){
if (foundIt==1){
}else if (newList.length()>0){
newList+="=" + currentValue;
}
break;
} else if (letter=='&'){
nameOfValue=0;
currentName="";
if (foundIt==1){
foundIt=0;
}else if (newList.length()>0){
newList+="=" + currentValue;
}
} else if (letter=='='){
if (currentName==name){
foundIt=1;
}else{
foundIt=0;
newList+="&" + currentName;
}
nameOfValue=1;
currentValue="";
}
else{
if (nameOfValue==0){
currentName+=letter;
}else{
currentValue+=letter;
}
}
}
for (int i = 0; i < 512; ++i){
EEPROM.write(i,'\n');
}
EEPROM.commit();
for (int i = 0; i < newList.length(); ++i){
EEPROM.write(i,newList.charAt(i));
}
EEPROM.commit();
Serial.println(name);
Serial.println(newList);
return newList;
}
void eepromClear(){
Serial.println("eepromClear");
for (int i = 0; i < 512; ++i){
EEPROM.write(i,'\n');
}
}
String eepromList(){
Serial.println("eepromList");
char letter;
String list="";
for (int i = 0; i < 512; ++i){
letter= char(EEPROM.read(i));
if (letter=='\n'){
break;
}else{
list+=letter;
}
}
Serial.println(list);
return list;
}
String eepromGet(String name){
Serial.println("eepromGet");
int nameOfValue;
String currentName="";
String currentValue="";
int foundIt=0;
String value="";
char letter;
for (int i = 0; i < 512; ++i){
letter= char(EEPROM.read(i));
if (letter=='\n'){
if (foundIt==1){
value=currentValue;
}
break;
} else if (letter=='&'){
nameOfValue=0;
currentName="";
if (foundIt==1){
value=currentValue;
break;
}
} else if (letter=='='){
if (currentName==name){
foundIt=1;
}else{
}
nameOfValue=1;
currentValue="";
}
else{
if (nameOfValue==0){
currentName+=letter;
}else{
currentValue+=letter;
}
}
}
Serial.print(name);
Serial.print(":");
Serial.println(value);
return value;
}
