commit 0ca6818a67fd980d56d4a39250fc33bd194a2c80
Author: maddiebaka <madeline@cray.lgbt>
Date:   Tue Feb 13 17:46:16 2024 -0500

    Initial commit with proof of concept

diff --git a/NORFlasherFirmware.ino b/NORFlasherFirmware.ino
new file mode 100644
index 0000000..6505d08
--- /dev/null
+++ b/NORFlasherFirmware.ino
@@ -0,0 +1,131 @@
+#define OE 3
+// PGM is also WE# according to data sheet
+#define PGM 2
+
+// 18 pin address line
+#define Addr0 22
+#define Addr18 40
+
+// 8 pin data line
+#define Data0 44
+#define Data7 51
+
+void setCtrlPins() {
+  pinMode(OE, OUTPUT);
+  pinMode(PGM, OUTPUT);
+}
+
+void setAddrPinsOut() {
+  for(int a = Addr0; a <= Addr18; a++) {
+    pinMode(a, OUTPUT);
+    digitalWrite(a, LOW);
+  }
+}
+
+void setDataPinsOut() {
+  for(int d = Data0; d <= Data7; d++) {
+    pinMode(d, OUTPUT);
+    digitalWrite(Data0 + d, LOW);
+  }
+}
+
+void setDataPinsIn() {
+  for(int d = Data0; d <= Data7; d++) {
+    pinMode(Data0 + d, INPUT);
+  }
+}
+
+void setByte(byte out) {
+  for(int i = 0; i < 8; i++) {
+    digitalWrite(Data0 + i, bitRead(out,i));
+  }
+}
+
+void setAddress(unsigned long addr) {
+  for(int i = 0; i < 19; i++) {
+    digitalWrite(Addr0 + i, bitRead(addr, i) );
+  }
+}
+
+byte readByte() {
+  byte temp_in = 0;
+  for(int i = 0; i < 8; i++) {
+    if(digitalRead(Data0 + i)) {
+      bitSet(temp_in, i);
+    }
+  }
+
+  return temp_in;
+}
+
+byte readData(unsigned long address) {
+  byte temp_read;
+  setDataPinsIn();
+
+  digitalWrite(PGM, HIGH);
+  digitalWrite(OE, HIGH);
+
+  setAddress(address);
+
+  digitalWrite(OE, LOW);
+  delayMicroseconds(1);
+
+  temp_read = readByte();
+
+  return temp_read;
+}
+
+void writeByte(byte data, unsigned long address) {
+  setAddress(address);
+  setByte(data);
+
+  digitalWrite(OE, HIGH);
+  digitalWrite(PGM, HIGH);
+
+  delayMicroseconds(2);
+
+  digitalWrite(PGM, LOW);
+  delayMicroseconds(1);
+  digitalWrite(PGM, HIGH);
+}
+
+void programData(byte data, unsigned long address) {
+  setDataPinsOut();
+
+  writeByte(0xAA, 0x5555);
+  writeByte(0x55, 0x2AAA);
+  writeByte(0xA0, 0x5555);
+  writeByte(data, address);
+
+  delayMicroseconds(30);
+
+  Serial.println(data, HEX);
+  Serial.println(address, HEX);
+}
+
+void setup() {
+  // Debug trigger
+  pinMode(10, OUTPUT);
+  digitalWrite(10, LOW);
+  // put your setup code here, to run once:
+  setCtrlPins();
+
+  setAddrPinsOut();
+  setDataPinsOut();
+
+  Serial.begin(9600);
+  delay(2);
+  Serial.println("Started Serial COM.");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  programData(0x3F, 0x0000);
+
+  byte data = readData(0x0000);
+  // Serial.print("data: ");
+  Serial.print("Data returned: ");
+  Serial.println(data, HEX);
+  // Serial.println("\n");
+  delay(1);
+}