Started implementing EEPROM writer/reader for AT28C256.

at28c256/at28c256.c

@@ -0,0 +1,34 @@
+#include "at28c256.h"
+#include "../ard/pins.h"
+
+unsigned char _addrck, _addr;
+
+void at28c256_init(unsigned char addrck, unsigned char addr) {
+	pin_mode(addrck, OUTPUT);
+	digital_write(addrck, LOW); // disable
+	pin_mode(addr, OUTPUT);
+	digital_write(addr, LOW); // disable
+	
+    _addrck = addrck;
+	_addr = addr;
+}
+
+void at28c256_write(unsigned short addr, unsigned char data) {
+    // set the address
+    unsigned int i;
+
+    for(i = 0; i < 16; i++) {
+        if(addr & (1 << (15-i))) {
+            digital_write(_addr, HIGH);
+        } else {
+            digital_write(_addr, LOW);
+        }
+
+        digital_write(_addrck, HIGH);
+        digital_write(_addrck, LOW);
+    }
+
+    digital_write(_addr, LOW);
+
+    // TODO write data
+}

at28c256/at28c256.h

@@ -0,0 +1,8 @@
+#ifndef AT28C256_H_
+#define AT28C256_H_
+
+void at28c256_init(unsigned char, unsigned char);
+void at28c256_write(unsigned short, unsigned char);
+//unsigned char at28c256_read(unsigned short); TODO
+
+#endif