Simple keyboard interface. It really works.

Not done: shift, control

Author: dplassgit

vg4_keyboard/keyboardv0/keyboardv0.ino

@@ -0,0 +1,56 @@
+/*
+   Simple keyboard interface. Triggers when the data pin goes low.
+   Records 8 bits at 110 baud.
+*/
+
+const int dataPin = 2;      // corresponds to pin 6 on the KB connector (and pin 6 of the RJ12)
+const int resetPin = 5;     // corresponds to pin 2 on the KB connector (and pin 4 on the RJ12)
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(resetPin, OUTPUT);
+  pinMode(dataPin, INPUT);
+
+  // Set the reset pin low for 10 ms.
+  digitalWrite(resetPin , LOW);
+  delay(10);
+  digitalWrite(resetPin , HIGH);
+
+  Serial.begin(9600);
+  Serial.println("Hello logic_analyzer");
+}
+
+// Microseconds to wait between bits
+const int baudDelay = 3333;
+
+void loop() {
+  int data = digitalRead(dataPin);
+  if (data == LOW) {
+    digitalWrite(LED_BUILTIN, HIGH);
+    //    Serial.print("START: ");
+    int index = 0;
+    int allData[9];
+    int theKey = 0;
+    // Wait half a cycle so that we're sampling in the middle of the bit.
+    delayMicroseconds(baudDelay / 2);
+    while (index <= 8) {
+      data = digitalRead(dataPin);
+      allData[index++] = data;
+      if (data == HIGH) {
+        theKey = (theKey >> 1) | 0x80;
+      } else {
+        theKey = (theKey >> 1);
+      }
+      // Wait for the next bit
+      delayMicroseconds(baudDelay);
+    }
+    Serial.print("YOU TYPED: ");
+    Serial.print((char)theKey);
+    Serial.print(" ("); Serial.print(theKey); Serial.print("=0b");
+    for (int i = index - 1; i >= 0; i--) {
+      Serial.print(allData[i]);
+    }
+    Serial.println(")");
+    digitalWrite(LED_BUILTIN, LOW);
+  }
+}