Arduino can store only char variables in the EEPROM.
Here, a pointer of the type char is created. This pointer is then assigned to the address of our any variable.
So that the compiler does not bother, because of different type of pointer and variable I use the "reinterpret_cast < c h a r *>". With "reinterpret_cast" each type is considered char.
With the "&" sign in front of the variable names, it is possible to determine the start address of the variable in the RAM.
Now EEPROMAnythingWrite function can store all bytes of any variable in the EEPROM one after the other.
For the EEPROMAnythingWrite function to know how many bytes to store, the number of bytes in the variable is passed with "sizeof (variable)" to the function.
The EEPROMAnythingWrite function returns the next free memory location in the EEPROM as a return value.
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#include <EEPROM.h> // Write any data structure or variable to EEPROM int EEPROMAnythingWrite(int pos, char *zeichen, int lenge) { for (int i = 0; i < lenge; i++) { EEPROM.write(pos + i, *zeichen); zeichen++; } return pos + lenge; } // Read any data structure or variable from EEPROM int EEPROMAnythingRead(int pos, char *zeichen, int lenge) { for (int i = 0; i < lenge; i++) { *zeichen = EEPROM.read(pos + i); zeichen++; } return pos + lenge; } struct Timer_stuct { byte art; unsigned long timestamp; byte relais; }; void setup() { Serial.begin(115200); Serial.println(" "); Serial.println("Start"); EEPROM.begin(255); // Integer to EEPROM at position 100 unsigned int zahl_int = 1000; int nekst_free = EEPROMAnythingWrite(100, reinterpret_cast<char*>(&zahl_int), sizeof(zahl_int)); // Float to EEPROM float zahl_float = 0.123; nekst_free = EEPROMAnythingWrite(nekst_free, reinterpret_cast<char*>(&zahl_float), sizeof(zahl_float)); // Store structure (struct) to EEPROM Timer_stuct timer; timer.art = 88; timer.timestamp = 1485206580; timer.relais = 3; nekst_free = EEPROMAnythingWrite(nekst_free, reinterpret_cast<char*>(&timer), sizeof(timer)); // Store array to EEPROM unsigned long timestamps[2] = {1485206594, 1485206890}; EEPROMAnythingWrite(nekst_free, reinterpret_cast<char*>(×tamps), sizeof(timestamps)); EEPROM.commit(); unsigned int zahl2_int = 0; float zahl2_float = 0.0; Timer_stuct timer2; unsigned long timestamps2[2]; // Integer read from EEPROM nekst_free = EEPROMAnythingRead(100, reinterpret_cast<char*>(&zahl2_int), sizeof(zahl2_int)); // Float read to EEPROM nekst_free = EEPROMAnythingRead(nekst_free, reinterpret_cast<char*>(&zahl2_float), sizeof(zahl2_float)); // Read structure (struct) from EEPROM nekst_free = EEPROMAnythingRead(nekst_free, reinterpret_cast<char*>(&timer2), sizeof(timer2)); // Read array from EEPROM EEPROMAnythingRead(nekst_free, reinterpret_cast<char*>(×tamps2), sizeof(timestamps2)); Serial.println(zahl2_int); Serial.println(zahl2_float, 3); Serial.println("art = " + String(timer2.art) + " ,timestamp = " + String(timer2.timestamp) + " , relais = " + String(timer2.relais)); Serial.println("timestamp 1 = " + String(timestamps2[0]) + " , timestamp 2 = " + String(timestamps2[1])); } void loop() { } |
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