EEPROM LIB not working .

[PTT31]

#include <EEPROM.h>
#define FLASH_END 0x0800FC00UL
struct MyObject {
float field1;
byte field2;
char name[10];
};

void setup() {

Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}

float f = 123.456f; //Variable to store in EEPROM.
int eeAddress = 0; //Location we want the data to be put.

//One simple call, with the address first and the object second.
EEPROM.put(eeAddress, f);

Serial.println("Written float data type!");

/** Put is designed for use with custom structures also. **/

//Data to store.
MyObject customVar = {
3.14f,
65,
"Working!"
};

eeAddress += sizeof(float); //Move address to the next byte after float 'f'.

EEPROM.put(eeAddress, customVar);
Serial.print("Written custom data type! \n\nView the example sketch eeprom_get to see how you can retrieve the values!");
}

void loop() { /* Empty loop */ }

I have a fake Blue Pill from china and i can't write in flash with eeprom lib.
thanks you.

[fpistm]

First, define added on top of the sketch is not correct, you have to redefine it using build_opt.h for example.
Finally:

I have a fake Blue Pill from china and i can't write in flash with eeprom lib.

We do not support fake BP.