Merge branch 'trunk' of https://github.com/dplassgit/arduino into trunk

Author: dplassgit

README.md

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+# Arduino sketches
+
+A [PLASS] Program
+
+## To download
+
+git clone [email protected]:dplassgit/arduino.git
+
+## To upload
+
+git push origin trunk

keyboardv0/README.md

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+# Keyboard v0
+
+An Arduino sketch to retrieve serial binary from the Vector Graph 4 keyboard.
+
+After an active-low trigger, the first bit is skipped, then
+subsequent bits are shifted in LSB to MSB, for 7 bits.

vg4_keyboard/keyboardv0/keyboardv0.ino renamed to keyboardv0/keyboardv0.ino

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+# Keyboard v0
+
+An Arduino sketch to act like a logic analyzer.
+
+After an active-low trigger, bits are read until N consecutive 1s are seen.

logic_analyzer/README.md

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+/*
+ * Simple logic analyzer. Triggers when the data pin goes low.
+ * Records bits until 30  1's in a row are received.
+ * Attemps to debounce the button (poorly). Resets the board
+ * (reset pin low) when the button is pressed, and starts listening.
+*/
+
+const int buttonPin = 7;     // the number of the pushbutton pin
+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)
+
+int buttonState = 0;         // variable for reading the pushbutton status
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(buttonPin, INPUT);
+  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");
+}
+
+int changed = 0;
+int shouldRead = 0;
+int data = 0;
+int inKey = 0;  // are we reading a key?
+int numOnes = 0;  // the # of 1s in a row
+
+void loop() {
+  // read the state of the pushbutton value:
+  buttonState = digitalRead(buttonPin);
+
+  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
+  if (buttonState == HIGH && !changed) {
+    // turn LED on, and toggle recording.
+    digitalWrite(LED_BUILTIN, HIGH);
+    Serial.println("on");
+    shouldRead = 1 - shouldRead;
+    Serial.print("ShouldRead is "); Serial.println(shouldRead);
+    changed = 1;
+  } else if (buttonState == LOW && changed) {
+    // turn LED off:
+    digitalWrite(LED_BUILTIN, LOW);
+    Serial.println("off");
+    changed = 0;
+ 
+    // beep/reset, and keep reading.
+    digitalWrite(resetPin , LOW);
+    delay(10);
+    digitalWrite(resetPin , HIGH);
+  }
+
+  if (shouldRead == 1) {
+    data = digitalRead(dataPin);
+    if (data == LOW && !inKey) {
+      inKey=1;  // we're recording until numones==30
+      numOnes=0;
+      Serial.println("START");
+      Serial.println("0");
+    } else if (inKey) {
+      if (data == HIGH) {
+        Serial.println("1");
+        numOnes++;
+        if (numOnes == 30) {
+          inKey=0;
+          numOnes=0;
+          Serial.println("END");
+          delay(500);
+        }
+      } else {
+        numOnes=0;
+        Serial.println("0");
+      }
+    }
+  }
+}