ps/2 debugger

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);
+}