From 6cdcceefddd2fef28bd1bd4174b2edc22925bd1a Mon Sep 17 00:00:00 2001
From: Dejvino <dejvino@gmail.com>
Date: Thu, 30 Mar 2023 06:23:06 +0200
Subject: [PATCH] Key typing over serial

---
 terminal_keyboard_emulator.ino | 51 +++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 16 deletions(-)

diff --git a/terminal_keyboard_emulator.ino b/terminal_keyboard_emulator.ino
index c91d393..48230b0 100644
--- a/terminal_keyboard_emulator.ino
+++ b/terminal_keyboard_emulator.ino
@@ -10,6 +10,7 @@ const int timerDelay = 500;
 void setup(void)
 {
   pinMode(pinData, OUTPUT);
+  digitalWrite(pinData, HIGH);
   
   Timer1.initialize(timerDelay);
   Timer1.attachInterrupt(clockCycle);
@@ -28,22 +29,38 @@ volatile int dataState = 0;
 volatile int dataDelay = 0;
 volatile int packetDelay = 0;
 volatile int packetTail = 0;
-volatile int clkState = LOW;
+volatile int clkState = HIGH;
 
-void statusCycle() {
-  long timeNow = millis();
-  long changeDiff = timeNow - lastChange;
-  lastChange = timeNow;
-  if (changeDiff >= 10) {
-    dataWord = (0 + x);
+volatile bool nextKeyReady = false;
+volatile byte nextKey = 0;
+
+void typeKey(byte key) {
+    noInterrupts();
+    nextKeyReady = true;
+    nextKey = key;
+    interrupts();
+}
+    
+void sendKey(byte key) { 
+    noInterrupts();
+    dataWord = key;
     dataState = 8;
     dataDelay = 0;
     packetDelay = 0;
-    packetTail = 100;
-    x = (x + 1) % 8; 
+    packetTail = 10;
     clkState = HIGH;
+    interrupts();
     Timer1.initialize(timerDelay);
     Timer1.start();
+}
+
+void statusCycle() {
+  long timeNow = millis();
+  long changeDiff = timeNow - lastChange;
+  lastChange = timeNow;
+  if (changeDiff >= 10 && nextKeyReady) {
+      sendKey(nextKey);
+      nextKeyReady = false;
   }
 }
 
@@ -75,11 +92,13 @@ void clockCycle(void)
 
 void loop(void)
 {
-  delay(500);
-  
-  /*noInterrupts();
-  dataWord = 0b1000000011 | (('A' + x) << 2);
-  dataState = 16;
-  x = (x + 1) % 30;
-  interrupts();*/
+  delay(50);
+
+  if (Serial.available() > 0) {
+      long key = Serial.parseInt(SKIP_ALL);
+      if (key != 0) {
+	typeKey(key);
+      }
+  }
 }
+