How to save ULong variable value in EEPROM?

[kg300]

Hi, I want to save a Ulong Variable (06 digits) in EEPROM, any example for me.?
I get a code from Arduino forum, writing in the eeprom memory locations is ok, but when i tried to get back data from these locations variable only show the value less then 65000. mean only get back Unint value from eeprom. any help pleas...

long EEPROMReadlong(long address) {
long four = EEPROM.read(address);
long three = EEPROM.read(address + 1);
long two = EEPROM.read(address + 2);
long one = EEPROM.read(address + 3);

return ((four << 0) & 0xFF) + ((three << & 0xFFFF) + ((two << 16) & 0xFFFFFF) + ((one << 24) & 0xFFFFFFFF);
}

void EEPROMWritelong(int address, long value) {
byte four = (value & 0xFF);
byte three = ((value >> & 0xFF);
byte two = ((value >> 16) & 0xFF);
byte one = ((value >> 24) & 0xFF);

EEPROM.write(address, four);
EEPROM.write(address + 1, three);
EEPROM.write(address + 2, two);
EEPROM.write(address + 3, one);
}

[Benj]

Hello,

Maybe try this instead.

Read

Code: Select all

byte four = EEPROM.read(address);
byte three = EEPROM.read(address + 1);
byte two = EEPROM.read(address + 2);
byte one = EEPROM.read(address + 3);

return = one
return = return << 8
return = return | two
return = return << 8
return = return | three
return = return << 8
return = return | four

Write

Code: Select all

byte four = value;
value = value >> 8;
byte three = value;
value = value >> 8;
byte two = value;
value = value >> 8;
byte one = value;

EEPROM.write(address, four);
EEPROM.write(address + 1, three);
EEPROM.write(address + 2, two);
EEPROM.write(address + 3, one);

[kg300]

Its working ok. thanks Benj

[Sashinda]

hi,
How to write this in calculation block?

EEPROM Read;-
return = one
return = return << 8
return = return | two
return = return << 8
return = return | three
return = return << 8
return = return | four

EEPROM Write :-

byte four = value;
value = value >> 8;
byte three = value;
value = value >> 8;
byte two = value;
value = value >> 8;
byte one = value;

Please help me...

[medelec35]

Hi Sashinda,
Welcome to the forums.
I have attached a flowchart that works the way Ben suggested.
I have also included two alternative ways of saving and retrieving ULongs(disabled icons).

[Sashinda]

hello...Medelec35
It's working super...
Thanks a lot.
I will never forget your help...

[medelec35]

Hi Sashinda ,
You're welcome.
I'm pleased you have your project working super.
Thank you for letting us know, really appreciate it.

[AbhijitR]

Hello! Martin

Many thanks for this post, you are too good.

I have also included two alternative ways of saving and retrieving ULongs(disabled icons).

Finally I got the opportunity to thank you.

Abhi