MeshCore/src/helpers/ui/ST7789LCDDisplay.cpp

#include "ST7789LCDDisplay.h"
#include "ColorTheme.h"

#ifndef PIN_TFT_MISO
  #define PIN_TFT_MISO -1
#endif

#ifndef DISPLAY_ROTATION
  #define DISPLAY_ROTATION 3
#endif

#define DISPLAY_WIDTH 240
#define DISPLAY_HEIGHT 320

// The compiled orientation, optionally turned 180 degrees by `display.flip`.
// Adding 2 keeps portrait portrait and landscape landscape, so the viewport
// geometry below never has to change with it.
uint8_t ST7789LCDDisplay::effectiveRotation() const {
  return (uint8_t)((DISPLAY_ROTATION + (_flipped ? 2 : 0)) & 3);
}

void ST7789LCDDisplay::setFlipped(bool flipped) {
  if (_flipped == flipped) return;
  _flipped = flipped;
  if (_panel_ready) display.setRotation(effectiveRotation());
}

bool ST7789LCDDisplay::i2c_probe(TwoWire& wire, uint8_t addr) {
  return true;
}

// Color scheme
ColorVal UIColor::window_bkg = mesh::ui::color_theme::WINDOW_BACKGROUND;
ColorVal UIColor::title_bkg = mesh::ui::color_theme::TITLE_BACKGROUND;
ColorVal UIColor::title_txt = mesh::ui::color_theme::TEXT;
ColorVal UIColor::primary_txt = mesh::ui::color_theme::TEXT;
ColorVal UIColor::secondary_txt = mesh::ui::color_theme::SECONDARY_TEXT;
ColorVal UIColor::warning_txt = mesh::ui::color_theme::WARNING_TEXT;
ColorVal UIColor::popup_bkg = mesh::ui::color_theme::POPUP_BACKGROUND;
ColorVal UIColor::popup_txt = mesh::ui::color_theme::TEXT;
ColorVal UIColor::corp_blue = mesh::ui::color_theme::ACCENT;

bool ST7789LCDDisplay::begin() {
  if (!_isOn) {
  #ifdef HELTEC_V4_R8_TFT
    // turnOff() leaves this panel configured and powered - its reset line is
    // shared with the touch controller, so it is never parked low - which makes
    // waking just a backlight switch. Re-running the init below would re-enter
    // SPI setup and pulse GPIO 21, resetting the touch controller on every wake
    // and stalling the UI loop for ~500 ms of reset delays.
    if (_panel_ready) {
      if (_peripher_power) _peripher_power->claim();
      if (PIN_TFT_LEDA_CTL != -1) {
        digitalWrite(PIN_TFT_LEDA_CTL, PIN_TFT_LEDA_CTL_ACTIVE);
      }
      _isOn = true;
      return true;
    }
  #endif

    if (_peripher_power) {
      _peripher_power->claim();
    #ifdef HELTEC_V4_R8_TFT
      delay(100);
    #endif
    }

    if (PIN_TFT_LEDA_CTL != -1) {
      pinMode(PIN_TFT_LEDA_CTL, OUTPUT);
    #ifdef HELTEC_V4_R8_TFT
      digitalWrite(PIN_TFT_LEDA_CTL, !PIN_TFT_LEDA_CTL_ACTIVE);
    #else
      digitalWrite(PIN_TFT_LEDA_CTL, HIGH);
    #endif
    }

    // Im not sure if this is just a t-deck problem or not, if your display is slow try this.
    #if defined(LILYGO_TDECK) || defined(HELTEC_LORA_V4_TFT) || defined(HELTEC_V4_R8_TFT)
      displaySPI.begin(PIN_TFT_SCL, PIN_TFT_MISO, PIN_TFT_SDA, PIN_TFT_CS);
    #endif

    display.init(DISPLAY_WIDTH, DISPLAY_HEIGHT);
    display.setRotation(effectiveRotation());
    setDimensions(display.width(), display.height());

    display.setSPISpeed(40e6);

    display.fillScreen(ST77XX_BLACK);
    display.setTextColor(ST77XX_WHITE);
    display.setTextSize(1);
    display.setTextWrap(false);
    display.cp437(true); // Use full 256 char 'Code Page 437' font

  #ifdef HELTEC_V4_R8_TFT
    if (PIN_TFT_LEDA_CTL != -1) {
      digitalWrite(PIN_TFT_LEDA_CTL, PIN_TFT_LEDA_CTL_ACTIVE);
    }
  #endif

    _panel_ready = true;
    _isOn = true;
  }

  return true;
}

void ST7789LCDDisplay::turnOn() {
  ST7789LCDDisplay::begin();
}

void ST7789LCDDisplay::turnOff() {
  if (_isOn) {
    if (PIN_TFT_LEDA_CTL != -1) {
    #ifdef HELTEC_V4_R8_TFT
      digitalWrite(PIN_TFT_LEDA_CTL, !PIN_TFT_LEDA_CTL_ACTIVE);
    #else
      digitalWrite(PIN_TFT_LEDA_CTL, HIGH);
    #endif
    }
  #ifndef HELTEC_V4_R8_TFT
    if (PIN_TFT_RST != -1) {
      digitalWrite(PIN_TFT_RST, LOW);
    }
    if (PIN_TFT_LEDA_CTL != -1) {
      digitalWrite(PIN_TFT_LEDA_CTL, LOW);
    }
  #else
    // On the V4 R8 Expansion Kit this reset line is shared with the touch
    // panel's TP_RST, so parking it low would hold the touch controller in
    // reset for as long as the display is off. Killing the backlight is what
    // "off" means for this LCD anyway.
  #endif
    _isOn = false;

    if (_peripher_power) _peripher_power->release();
  }
}

void ST7789LCDDisplay::clear() {
  display.fillScreen(ST77XX_BLACK);
}

void ST7789LCDDisplay::startFrame(ColorVal bkg) {
  display.fillScreen(bkg);
  display.setTextColor(_color = UIColor::primary_txt);
  display.setTextSize(1);
  display.cp437(true); // Use full 256 char 'Code Page 437' font
}

void ST7789LCDDisplay::setTextSize(int sz) {
  display.setTextSize(sz > 0 ? sz : 1);
}

void ST7789LCDDisplay::setColor(ColorVal c) {
  display.setTextColor(_color = c);
}

void ST7789LCDDisplay::setCursor(int x, int y) {
  display.setCursor(x, y);
}

void ST7789LCDDisplay::print(const char* str) {
  display.print(str);
}

void ST7789LCDDisplay::fillRect(int x, int y, int w, int h) {
  display.fillRect(x, y, w, h, _color);
}

void ST7789LCDDisplay::drawRect(int x, int y, int w, int h) {
  display.drawRect(x, y, w, h, _color);
}

void ST7789LCDDisplay::drawXbm(int x, int y, const uint8_t* bits, int w, int h) {
  // The common UI bitmaps are MSB-first, as expected by drawBitmap.
  display.drawBitmap(x, y, bits, w, h, _color);
}

uint16_t ST7789LCDDisplay::getTextWidth(const char* str) {
  int16_t x1, y1;
  uint16_t w, h;
  display.getTextBounds(str, 0, 0, &x1, &y1, &w, &h);
  return w;
}

void ST7789LCDDisplay::endFrame() {
  // display.display();
}