Create SmartyKitApple1_VideoTerminalTemp.ino

Provide support for '_' cursor

SmartyKitApple1_VideoTerminalTemp/SmartyKitApple1_VideoTerminalTemp.ino

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+/*  SmartyKit Apple I replica - video driver
+ *  http://apple1.smartykit.org/ 
+ *  Copyright (C) 2019, Sergey Panarin <contact@smartykit.org>
+ *  
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <TVout.h>
+#include <avr/pgmspace.h>
+
+const int IRQpin =  2; // write to display
+
+const int pinDA =  12; // read
+
+//int DataBus[8] = {4, 5, 6, 7, 8, 9, 10, 11};
+//TV uses pin 7 and pin 9
+int DataBus[8] = {4, 5, 6, 3, 8, 13, 10, 11};
+
+
+int bitDA = 0;
+
+byte scan_code=0;  
+
+int color = WHITE;
+const int CHAR_BUFFER = 32 * 16; //32 columns and 16 rows
+char videoBuffer[CHAR_BUFFER];
+int bufferLen = 0;
+
+TVout TV;
+
+void setup() {
+  pinMode(pinDA, OUTPUT); 
+  digitalWrite(pinDA, HIGH); //wait until video setup is ready
+
+
+  TV.begin(NTSC, 128, 96);
+  TV.selectFont(font4x6);
+  TV.println("Hello!\r\nI am SmartyKit Apple I replica\n");
+
+   delay(1000);
+  for (int count = 1; count <= 8; count++) {
+    pinMode(DataBus[count-1], INPUT); 
+  };
+  pinMode(IRQpin, INPUT); 
+
+  //attaching an IRQ to IRQpin
+  attachInterrupt(0, videoCharInterrupt, RISING); 
+  Serial.begin(9600); 
+ digitalWrite(pinDA, LOW); //default state after restart = 0 (ready to print) 
+
+}
+
+void loop() {
+  
+  
+  //TV.printChar(TV._cursorX, TV._cursorY, "@");
+  TV.drawLine(TV._cursorX, TV._cursorY + pgm_read_byte(TV.font + 1) - 1, TV._cursorX + pgm_read_byte(TV.font), TV._cursorY + pgm_read_byte(TV.font + 1) - 1, (char)color);
+  if (color == WHITE)
+  color = BLACK;
+  else
+  color = WHITE;
+  
+  delay(500);
+  
+}
+
+
+//interruption service routine (ISR)
+void videoCharInterrupt(void) {   
+  bitDA = 1;
+  digitalWrite(pinDA, HIGH);     
+
+  scan_code = 0;
+  for (int count = 1; count <= 8 ; count++) {
+    int pinValue = digitalRead(DataBus[count-1]);    
+    scan_code |= pinValue << (count-1);   
+  };
+
+  if (scan_code == 0x7F)
+     return; //skip initial setup value
+  
+  scan_code = scan_code & 0x7F; //clear bit 7
+  
+ // if (scan_code != 127)
+ //    scan_code -= 128;
+   
+  if (scan_code == 0xD)
+  {
+      Serial.println();
+      TV.println("");
+  }
+  else
+  {
+    //make all symbols uppercase
+    if (scan_code >= 0x60)
+      scan_code -= 0x20;
+
+     //print only visible chars, starting from blanc 
+     if (scan_code >= 0x20)
+     { 
+         Serial.print((char)scan_code); 
+         TV.print((char)scan_code); 
+     }
+     //backspace
+     if (scan_code == 0x8)
+         TV.print((char)scan_code); 
+      
+  } 
+
+  bitDA = 0;
+  digitalWrite(pinDA, LOW); 
+}