From 42db4942ddea9589ec298ecfd2cd91b40a724a9c Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Fri, 4 May 2007 21:53:23 +0000
Subject: [PATCH] Adding EEPROM library examples.

---
 .../examples/eeprom_clear/eeprom_clear.pde    | 21 ++++++++++
 .../examples/eeprom_read/eeprom_read.pde      | 38 +++++++++++++++++++
 .../examples/eeprom_write/eeprom_write.pde    | 38 +++++++++++++++++++
 3 files changed, 97 insertions(+)
 create mode 100644 targets/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.pde
 create mode 100644 targets/libraries/EEPROM/examples/eeprom_read/eeprom_read.pde
 create mode 100644 targets/libraries/EEPROM/examples/eeprom_write/eeprom_write.pde

diff --git a/targets/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.pde b/targets/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.pde
new file mode 100644
index 000000000..36af68e2a
--- /dev/null
+++ b/targets/libraries/EEPROM/examples/eeprom_clear/eeprom_clear.pde
@@ -0,0 +1,21 @@
+/*
+ * EEPROM Clear
+ *
+ * Sets all of the bytes of the EEPROM to 0.
+ */
+
+#include <EEPROM.h>
+
+void setup()
+{
+  // 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);
+}
+
+void loop()
+{
+}
diff --git a/targets/libraries/EEPROM/examples/eeprom_read/eeprom_read.pde b/targets/libraries/EEPROM/examples/eeprom_read/eeprom_read.pde
new file mode 100644
index 000000000..2e30708fc
--- /dev/null
+++ b/targets/libraries/EEPROM/examples/eeprom_read/eeprom_read.pde
@@ -0,0 +1,38 @@
+/*
+ * EEPROM Read
+ *
+ * Reads the value of each byte of the EEPROM and prints it 
+ * to the computer.
+ */
+
+#include <EEPROM.h>
+
+// start reading from the first byte (address 0) of the EEPROM
+int address = 0;
+byte value;
+
+void setup()
+{
+  Serial.begin(9600);
+}
+
+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);
+}
diff --git a/targets/libraries/EEPROM/examples/eeprom_write/eeprom_write.pde b/targets/libraries/EEPROM/examples/eeprom_write/eeprom_write.pde
new file mode 100644
index 000000000..ae7c57ebd
--- /dev/null
+++ b/targets/libraries/EEPROM/examples/eeprom_write/eeprom_write.pde
@@ -0,0 +1,38 @@
+/*
+ * 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()
+{
+}
+
+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.
+  addr = addr + 1;
+  if (addr == 512)
+    addr = 0;
+  
+  delay(100);
+}