From 11947c765ed0729ba4dc4f1d6a7e0b2aa3c08804 Mon Sep 17 00:00:00 2001
From: Arti Zirk <arti.zirk@gmail.com>
Date: Fri, 28 Apr 2017 06:01:31 +0300
Subject: [PATCH] Add Keyboard support

---
 stepper.ino | 58 ++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 51 insertions(+), 7 deletions(-)

diff --git a/stepper.ino b/stepper.ino
index b1e8f90..ad718e4 100644
--- a/stepper.ino
+++ b/stepper.ino
@@ -19,14 +19,29 @@
 
 #include <Stepper.h>
 
+// Typewriter head
 unsigned char charmap[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 24, 0, 64, 67, 74, 16, 72, 73, 51, 65, 14, 63, 1, 50, 57, 53, 54, 55, 56, 58, 59, 60, 61, 62, 31, 43, 0, 68, 0, 27, 0, 38, 19, 22, 30, 28, 23, 32, 42, 40, 36, 46, 34, 17, 44, 41, 35, 48, 25, 26, 37, 29, 33, 15, 49, 39, 21, 0, 0, 0, 45, 0, 82, 94, 88, 89, 86, 93, 3, 83, 4, 95, 84, 9, 87, 81, 92, 91, 6, 8, 90, 5, 2, 7, 85, 13, 79, 10, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 66, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 20, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 75, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 70, 0, 0, 0, 0, 0, 52, 0, 0, 0, 0, 0, 0, 0, 71, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 78, 0, 0, 0, 0, 0, 69, 0, 0};
 
+// Keyboard
+uint8_t keyMap[9][8] {
+/*0*/  {'5', '\x80'/*backarrw*/, '4', '=', '`', '9', '1', '8'},
+/*1*/  {0, 0, 'y', '[', 'w', 'p', 'e', 'u'},
+/*2*/  {'6', '\x81'/*forwarrw*/, '3', '-', 0, '0', '2', '7'},
+/*3*/  {'a', 0, 'k', '\n', 'f', '\x82'/*caps*/, 'g', 'l'},
+/*4*/  {'\t', '\x83'/*backsps*/, 't', ']', 'q', 'o', 'r', 'i'},
+/*5*/  {'s', 0, 'j', '\'', 'd', 0, 'h', ';'},
+/*6*/  {'c', '\x86'/*r_down_ctrl*/, 'm', 0, 'n', 'x', 0, '/'},
+/*7*/  {'v', 0, ',', '\x84'/*l_shift*/, 'b', 'z', '\\', '.'},
+/*8*/  {' ', '\x85'/*l_up_ctrl*/, 0, 0, 0, 0, 0, 0}
+};
+uint8_t lastKey[9] = { 0 };
+
 const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
 // for your motor
 
 // initialize the stepper library on pins 8 through 11:
 Stepper columnStepper(stepsPerRevolution, 8, 9, 10, 11);
-Stepper charWheelStepper(stepsPerRevolution, 7, 6, 5, 4);
+Stepper charWheelStepper(96, 7, 6, 5, 4);
 
 int charWidth = 11; // how many steps between char prints
 
@@ -34,11 +49,11 @@ int currentPos = 0;
 int currentChar = 0;
 int limitPin = 12;
 int headMotorLimitPin = 13;
-int hammerPin = 22;
+int hammerPin = 14;
 
 int Motor1A = 2;
 int Motor1B = 3;
-int Motor2A = 23;
+int Motor2A = 15;
 
 void setup() {
   // initialize the serial port:
@@ -57,13 +72,22 @@ void setup() {
 
   pinMode(hammerPin, OUTPUT);
   digitalWrite(hammerPin, LOW);
-  
+
+  // Keyboard
+  for (int i = 22; i < 30; i++) {
+    pinMode(i, INPUT);
+    digitalWrite(i, HIGH);
+  }
+  for (int i = 30; i < 40; i++) {
+    pinMode(i, INPUT);
+    digitalWrite(i, LOW);
+  }
 
   columnStepper.setSpeed(90);
   charWheelStepper.setSpeed(90);
-  Serial.println("Finding home");
+  //Serial.println("Finding home");
   findHome();
-  Serial.println("Home found!");
+  //Serial.println("Home found!");
 }
 
 void loop() {
@@ -91,6 +115,7 @@ void loop() {
     if (millis() - lastCharTime > 1000) {
       releaseSteppers();
     }
+    readKey();
   }
   while(1) {
     lineFeed();
@@ -162,7 +187,6 @@ void hammer() {
   digitalWrite(hammerPin, HIGH);
   delay(13);
   digitalWrite(hammerPin, LOW);
-  delay(10);
 }
 
 void freshTape() {  
@@ -244,3 +268,23 @@ void releaseSteppers(){
   }
 }
 
+uint8_t readKey() {
+  for (int i = 30; i < 39; i++) {
+    byte row = i -30;
+    pinMode(i, OUTPUT);
+    digitalWrite(i, LOW);
+    delay(5);
+    uint8_t input = PINA;
+    pinMode(i, INPUT);
+    digitalWrite(1, LOW);
+
+    for (int col = 0; col < 8; col++) {
+      bool set = !((input >> col) & 1);
+      bool last = !((lastKey[row] >> col) & 1);
+      if (set && !last) {
+        Serial.write(keyMap[row][7-col]);
+      }
+    }
+    lastKey[row] = input;
+  }
+}