EEPROM examples

Author: igrr

libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino

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+/*
+ * EEPROM Clear
+ *
+ * Sets all of the bytes of the EEPROM to 0.
+ * This example code is in the public domain.
+
+ */
+
+#include <EEPROM.h>
+
+void setup()
+{
+  EEPROM.begin(512);
+  // write a 0 to all 512 bytes of the EEPROM
+  for (int i = 0; i < 512; i++)
+    EEPROM.write(i, 0);
+
+  // turn the LED on when we're done
+  digitalWrite(13, HIGH);
+  EEPROM.end();
+}
+
+void loop()
+{
+}

libraries/EEPROM/examples/eeprom_read/eeprom_read.ino

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+/*
+ * EEPROM Read
+ *
+ * Reads the value of each byte of the EEPROM and prints it
+ * to the computer.
+ * This example code is in the public domain.
+ */
+
+#include <EEPROM.h>
+
+// start reading from the first byte (address 0) of the EEPROM
+int address = 0;
+byte value;
+
+void setup()
+{
+  // initialize serial and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+  EEPROM.begin(512);
+}
+
+void loop()
+{
+  // read a byte from the current address of the EEPROM
+  value = EEPROM.read(address);
+
+  Serial.print(address);
+  Serial.print("\t");
+  Serial.print(value, DEC);
+  Serial.println();
+
+  // advance to the next address of the EEPROM
+  address = address + 1;
+
+  // there are only 512 bytes of EEPROM, from 0 to 511, so if we're
+  // on address 512, wrap around to address 0
+  if (address == 512)
+    address = 0;
+
+  delay(500);
+}

libraries/EEPROM/examples/eeprom_write/eeprom_write.ino

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+/*
+ * EEPROM Write
+ *
+ * Stores values read from analog input 0 into the EEPROM.
+ * These values will stay in the EEPROM when the board is
+ * turned off and may be retrieved later by another sketch.
+ */
+
+#include <EEPROM.h>
+
+// the current address in the EEPROM (i.e. which byte
+// we're going to write to next)
+int addr = 0;
+
+void setup()
+{
+  EEPROM.begin(512);
+}
+
+void loop()
+{
+  // need to divide by 4 because analog inputs range from
+  // 0 to 1023 and each byte of the EEPROM can only hold a
+  // value from 0 to 255.
+  int val = analogRead(0) / 4;
+
+  // write the value to the appropriate byte of the EEPROM.
+  // these values will remain there when the board is
+  // turned off.
+  EEPROM.write(addr, val);
+
+  // advance to the next address.  there are 512 bytes in
+  // the EEPROM, so go back to 0 when we hit 512.
+  // save all changes to the flash.
+  addr = addr + 1;
+  if (addr == 512)
+  {
+    addr = 0;
+    EEPROM.commit();
+  }
+
+  delay(100);
+}