69 lines
1.8 KiB
Arduino
69 lines
1.8 KiB
Arduino
|
/***
|
||
|
|
eeprom_get example.
|
||
|
|
|
||
|
|
This shows how to use the EEPROM.get() method.
|
||
|
|
|
||
|
|
To pre-set the EEPROM data, run the example sketch eeprom_put.
|
||
|
|
This sketch will run without it, however, the values shown
|
||
|
|
will be shown from what ever is already on the EEPROM.
|
||
|
|
|
||
|
|
This may cause the serial object to print out a large string
|
||
|
|
of garbage if there is no null character inside one of the strings
|
||
|
|
loaded.
|
||
|
|
|
||
|
|
Written by Christopher Andrews 2015
|
||
|
|
Released under MIT licence.
|
||
|
|
***/
|
||
|
|
|
||
|
|
#include <EEPROM.h>
|
||
|
|
|
||
|
|
void setup() {
|
||
|
|
|
||
|
|
float f = 0.00f; //Variable to store data read from EEPROM.
|
||
|
|
int eeAddress = 0; //EEPROM address to start reading from
|
||
|
|
|
||
|
|
Serial.begin(9600);
|
||
|
|
while (!Serial) {
|
||
|
|
; // wait for serial port to connect. Needed for native USB port only
|
||
|
|
}
|
||
|
|
Serial.print("Read float from EEPROM: ");
|
||
|
|
|
||
|
|
//Get the float data from the EEPROM at position 'eeAddress'
|
||
|
|
EEPROM.get(eeAddress, f);
|
||
|
|
Serial.println(f, 3); //This may print 'ovf, nan' if the data inside the EEPROM is not a valid float.
|
||
|
|
|
||
|
|
/***
|
||
|
|
As get also returns a reference to 'f', you can use it inline.
|
||
|
|
E.g: Serial.print( EEPROM.get( eeAddress, f ) );
|
||
|
|
***/
|
||
|
|
|
||
|
|
/***
|
||
|
|
Get can be used with custom structures too.
|
||
|
|
I have separated this into an extra function.
|
||
|
|
***/
|
||
|
|
|
||
|
|
secondTest(); //Run the next test.
|
||
|
|
}
|
||
|
|
|
||
|
|
struct MyObject {
|
||
|
|
float field1;
|
||
|
|
byte field2;
|
||
|
|
char name[10];
|
||
|
|
};
|
||
|
|
|
||
|
|
void secondTest() {
|
||
|
|
int eeAddress = sizeof(float); //Move address to the next byte after float 'f'.
|
||
|
|
|
||
|
|
MyObject customVar; //Variable to store custom object read from EEPROM.
|
||
|
|
EEPROM.get(eeAddress, customVar);
|
||
|
|
|
||
|
|
Serial.println("Read custom object from EEPROM: ");
|
||
|
|
Serial.println(customVar.field1);
|
||
|
|
Serial.println(customVar.field2);
|
||
|
|
Serial.println(customVar.name);
|
||
|
|
}
|
||
|
|
|
||
|
|
void loop() {
|
||
|
|
/* Empty loop */
|
||
|
|
}
|