ComplexCompass/tty.hh at main · synning360/ComplexCompass · GitHub

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// (C) 2026 Lumisetiq

#ifndef TTY_HH
#define TTY_HH

class TTY {
private:
  const uint8_t RS = 15, E = 14, D4 = 13, D5 = 12, D6 = 11, D7 = 10;

  void pulseEnable() {
    digitalWrite(E, LOW); delayMicroseconds(1);
    digitalWrite(E, HIGH); delayMicroseconds(1);
    digitalWrite(E, LOW); delayMicroseconds(40);
  }

  void write4Bits(uint8_t value) {
    digitalWrite(D4, (value >> 0) & 0x01);
    digitalWrite(D5, (value >> 1) & 0x01);
    digitalWrite(D6, (value >> 2) & 0x01);
    digitalWrite(D7, (value >> 3) & 0x01);
    pulseEnable();
  }

  void send(uint8_t value, uint8_t mode) {
    digitalWrite(RS, mode);
    write4Bits(value >> 4);
    write4Bits(value);
  }

public:
  void init() {
    pinMode(RS, OUTPUT); pinMode(E, OUTPUT);
    pinMode(D4, OUTPUT); pinMode(D5, OUTPUT);
    pinMode(D6, OUTPUT); pinMode(D7, OUTPUT);
    delay(50);
    write4Bits(0x03); delay(5);
    write4Bits(0x03); delay(5);
    write4Bits(0x03); delay(1);
    write4Bits(0x02);
    send(0x28, 0); send(0x0C, 0); send(0x06, 0);
    clearText();
  }

  void clearText() {
    send(0x01, 0);
    delay(2);
    refreshStaticElements();
  }

  void refreshStaticElements() {
    uint8_t row0 = 0x80;
    send(row0, 0);
    for(int i=0; i<4; i++) send(i, 1);
    uint8_t row1 = 0xC0;
    send(row1, 0);
    for(int i=4; i<8; i++) send(i, 1);
  }

  void setCursor(uint8_t col, uint8_t row) {
    uint8_t x = col + 4;
    uint8_t addr = (row == 0) ? (0x80 + x) : (0xC0 + x);
    send(addr, 0);
  }

  void print(const char* str) {
    while(*str) send(*str++, 1);
  }

  void writeFrame(uint8_t frame[8][8]) {
    for (uint8_t i = 0; i < 8; i++) {
      send(0x40 + (i * 8), 0);
      for (uint8_t j = 0; j < 8; j++) {
        send(frame[i][j], 1);
      }
    }
    refreshStaticElements();
  }
};

#endif