From 8ed06f78e44e7faab1d460223770c5b4ec6fdbf0 Mon Sep 17 00:00:00 2001
From: Daniele Verducci su MatissePenguin <daniele.verducci@gmail.com>
Date: Fri, 12 Feb 2021 12:19:19 +0100
Subject: [PATCH] ps/2 debugger

---
 .../composite-pal-adapter-test.ino            | 41 +++++++++++++++++++
 .../ps2-keyb-controller-test.ino              | 35 ++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 prototiping-with-arduino/composite-pal-adapter-test/composite-pal-adapter-test.ino
 create mode 100644 prototiping-with-arduino/ps2-keyb-controller-test/ps2-keyb-controller-test.ino

diff --git a/prototiping-with-arduino/composite-pal-adapter-test/composite-pal-adapter-test.ino b/prototiping-with-arduino/composite-pal-adapter-test/composite-pal-adapter-test.ino
new file mode 100644
index 0000000..2a26e3a
--- /dev/null
+++ b/prototiping-with-arduino/composite-pal-adapter-test/composite-pal-adapter-test.ino
@@ -0,0 +1,41 @@
+/**
+ * Composite pal adapter test.
+ * This sketch makes an Arduino send test data to tha Pat80 composite video pal adapter.
+ * Connect the video adapter directly to Arduino
+ */
+
+const byte CLK = 11;   // output active low
+const byte RS = 12;   // output low = DATA register, high = COMMAND register
+const byte BUSY = 13;   // Input, Active low
+// DATA BUS (Output, active high): 3, 4, 5, 6, 7, 8, 9, 10;
+
+void setup() {
+  DDRD = DDRD | B11111000; // Port D (arduino pins 3 to 7) is output. In or to preserve serial pins and interrupt pin
+  DDRB = B00000111; // Port B (0,1,2) = pins 8,9,10 output
+  pinMode(CLK, OUTPUT);
+  pinMode(RS, OUTPUT);
+  pinMode(BUSY, INPUT);
+
+  digitalWrite(CLK, HIGH);  // Inactive clock
+}
+
+void loop() {
+  delay(1000);
+  send();
+}
+
+void send() {
+    // Random char
+    char c = random(32, 126);
+    // Wait for BUSY to become inactive (HIGH)
+    //while(digitalRead(BUSY) == LOW) {}
+
+    // Split byte to two parts and write to ports
+    PORTD = c << 3;
+    PORTB = c >> 5;
+
+    // Clock pulse
+    digitalWrite(CLK, LOW);
+    delay(100);
+    digitalWrite(CLK, HIGH);
+}
diff --git a/prototiping-with-arduino/ps2-keyb-controller-test/ps2-keyb-controller-test.ino b/prototiping-with-arduino/ps2-keyb-controller-test/ps2-keyb-controller-test.ino
new file mode 100644
index 0000000..bc4754f
--- /dev/null
+++ b/prototiping-with-arduino/ps2-keyb-controller-test/ps2-keyb-controller-test.ino
@@ -0,0 +1,35 @@
+/* PS/2 Keyboard controller debugger */
+
+#define EN 2
+const byte DATA_BUS[] = {10, 9, 8, 7, 6, 5, 4, 3};
+
+void setup() {
+  pinMode(EN, INPUT);
+  for(int pin=0; pin < 8; pin++) {
+    pinMode(DATA_BUS[pin], INPUT);
+  }
+
+  Serial.begin(57600);
+  Serial.println("PS/2 keyboard controller debugger");
+  Serial.println("DATA BUS    HEX     EN");
+
+  attachInterrupt(digitalPinToInterrupt(EN), onClk, FALLING);
+}
+
+void loop() {}
+
+void onClk() {
+  unsigned int data = 0;
+    for(int pin=0; pin < 8; pin++) {
+      byte b = digitalRead(DATA_BUS[pin]) ? 1 : 0;
+      Serial.print(b);
+      data = (data << 1) + b;   // Shifta di 1 e aggiunge il bit corrente. Serve per ricostruire il numero da binario
+    }
+
+    char output[50] = {};
+    sprintf(output, "    0x%02x    %c",
+      data,
+      digitalRead(EN) ? 'D' : 'I'
+    );
+    Serial.println(output);
+}