#include <Adafruit_GFX.h>   // include adafruit GFX library
#include <KS0108_GLCD.h>    // include KS0108 GLCD library
 

#define ArrLen(x)         (sizeof(x)/sizeof(x[0]))
 
// KS0108 GLCD library initialization according to the following connection:
// KS0108_GLCD(DI, RW, E, DB0, DB1, DB2, DB3, DB4, DB5, DB6, DB7, CS1, CS2, RES);
KS0108_GLCD display = KS0108_GLCD(A0, A1, A2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
 
 
#define NUMFLAKES     10 // Number of snowflakes in the animation example
 
#define LOGO_HEIGHT   16
#define LOGO_WIDTH    16
static const unsigned char PROGMEM logo_bmp[] =
{ 0b00000000, 0b11000000,
  0b00000001, 0b11000000,
  0b00000001, 0b11000000,
  0b00000011, 0b11100000,
  0b11110011, 0b11100000,
  0b11111110, 0b11111000,
  0b01111110, 0b11111111,
  0b00110011, 0b10011111,
  0b00011111, 0b11111100,
  0b00001101, 0b01110000,
  0b00011011, 0b10100000,
  0b00111111, 0b11100000,
  0b00111111, 0b11110000,
  0b01111100, 0b11110000,
  0b01110000, 0b01110000,
  0b00000000, 0b00110000 };

// ---------------------------------------------------------------------

// Serial -> CP437
int16_t ascii2lcd(unsigned char input) {
  switch(input) {
     case 230: return 145; // æ
     case 248: return 236; // ø
     case 229: return 134; // å
     case 198: return 146; // Æ
     case 216: return 237; // Ø
     case 197: return 143; // Å
     default:  return input;
  }
}
// ---------------------------------------------------------------------

int char2int(char c) {
  return (isdigit(c)) ? int(c-'0') : -1;
}
// ---------------------------------------------------------------------

constexpr char ae = -26;
constexpr char oe = -8;
constexpr char aa = -27;

char chars[] = {
  //'a', -26, -8, -27
  'a', ae, oe, aa
};

char buf[32];
const char str[] = "\xE6";

void setup()   {                
  delay(500);
  Serial.begin(9600);
  delay(500);
  memset(buf, '\0', 32);

  while (!Serial && millis() < 3000);
  Serial.println( F("display initialization!") );  

  // initialize KS0108 GLCD module with active high CS pins
  if ( display.begin(KS0108_CS_ACTIVE_HIGH) == false ) {
    Serial.println( F("display initialization failed!") );    // lack of RAM space
    while(true);  // stay here forever!
  }
 
  display.display();
  delay(2000); // Pause for 2 seconds
 
  display.setTextSize(2);
  display.setTextColor(KS0108_ON);
  display.cp437(true); 

  // Clear the buffer
  display.clearDisplay();
  display.println("READY!");
  display.display();
  delay(2000);
  /*
  for (byte i=0; i<255; i++)
    Serial.print(i),
    Serial.print(": "),
    Serial.println((char)i);

  Serial.println();
  */
  display.write(125);
  display.display();
}

void loop() {
  if (Serial.available() > 0) {
    String s = Serial.readStringUntil('\n');
    int x = s.toInt();
    display.clearDisplay();
    display.print(x); display.print(" -> ");
    display.write(x); display.println();
    display.display();
    /*
    String s = Serial.readStringUntil('\n');
    int x = s.toInt(); x = (x > 255) ? 255 : ((x < 0)?0:x);
    char c = x;
    Serial.print("int: "); Serial.print(x);
    Serial.print(", char: "); Serial.println(c);
    
    display.clearDisplay();
    display.print(c); display.print(" -> ");
    display.write((byte)c); display.println();
    display.display();
    */
  }
  delay(1);
}