MeshCore/src/helpers/ui/ST7789Display.cpp

#ifdef ST7789

#include "ST7789Display.h"

#ifndef X_OFFSET
#define X_OFFSET 0  // No offset needed for landscape
#endif

#ifndef Y_OFFSET
#define Y_OFFSET 1  // Vertical offset to prevent top row cutoff
#endif

#define SCALE_X  1.875f     // 240 / 128
#define SCALE_Y  2.109375f   // 135 / 64

bool ST7789Display::begin() {
  if(!_isOn) {
    pinMode(PIN_TFT_VDD_CTL, OUTPUT);
    pinMode(PIN_TFT_LEDA_CTL, OUTPUT);
    digitalWrite(PIN_TFT_VDD_CTL, LOW);
    digitalWrite(PIN_TFT_LEDA_CTL, LOW);
    digitalWrite(PIN_TFT_RST, HIGH);

    display.init();
    display.landscapeScreen();
    display.displayOn();
    setCursor(0,0);

    _isOn = true;
  }
  return true;
}

void ST7789Display::turnOn() {
  if (!_isOn) {
    // Restore power to the display but keep backlight off
    digitalWrite(PIN_TFT_VDD_CTL, LOW);
    digitalWrite(PIN_TFT_RST, HIGH);
    
    // Re-initialize the display
    display.init();
    display.displayOn();
    delay(20);

    // Now turn on the backlight
    digitalWrite(PIN_TFT_LEDA_CTL, LOW);
    
    _isOn = true;
  }
}

void ST7789Display::turnOff() {
  digitalWrite(PIN_TFT_VDD_CTL, HIGH);
  digitalWrite(PIN_TFT_LEDA_CTL, HIGH);
  digitalWrite(PIN_TFT_RST, LOW);
  _isOn = false;
}

void ST7789Display::clear() {
  display.clear();
}

void ST7789Display::startFrame(Color bkg) {
  display.clear();
}

void ST7789Display::setTextSize(int sz) {
  switch(sz) {
    case 1 :
      display.setFont(ArialMT_Plain_16);
      break;
    case 2 :
      display.setFont(ArialMT_Plain_24);
      break;
    default:
      display.setFont(ArialMT_Plain_16);
  }
}

void ST7789Display::setColor(Color c) {
  switch (c) {
    case DisplayDriver::DARK :
      _color = ST77XX_BLACK;
      break;
    case DisplayDriver::LIGHT : 
      _color = ST77XX_WHITE;
      break;
    case DisplayDriver::RED : 
      _color = ST77XX_RED;
      break;
    case DisplayDriver::GREEN : 
      _color = ST77XX_GREEN;
      break;
    case DisplayDriver::BLUE : 
      _color = ST77XX_BLUE;
      break;
    case DisplayDriver::YELLOW : 
      _color = ST77XX_YELLOW;
      break;
    case DisplayDriver::ORANGE : 
      _color = ST77XX_ORANGE;
      break;
    default:
      _color = ST77XX_WHITE;
      break;
  }
  display.setRGB(_color);
}

void ST7789Display::setCursor(int x, int y) {
  _x = x*SCALE_X + X_OFFSET;
  _y = y*SCALE_Y + Y_OFFSET;
}

void ST7789Display::print(const char* str) {
  display.drawString(_x, _y, str);
}

void ST7789Display::fillRect(int x, int y, int w, int h) {
  display.fillRect(x*SCALE_X + X_OFFSET, y*SCALE_Y + Y_OFFSET, w*SCALE_X, h*SCALE_Y);
}

void ST7789Display::drawRect(int x, int y, int w, int h) {
  display.drawRect(x*SCALE_X + X_OFFSET, y*SCALE_Y + Y_OFFSET, w*SCALE_X, h*SCALE_Y);
}

void ST7789Display::drawXbm(int x, int y, const uint8_t* bits, int w, int h) {
  // Calculate the base position in display coordinates
  uint16_t startX = x * SCALE_X + X_OFFSET;
  uint16_t startY = y * SCALE_Y + Y_OFFSET;
  
  // Width in bytes for bitmap processing
  uint16_t widthInBytes = (w + 7) / 8;
  
  // Process the bitmap row by row
  for (uint16_t by = 0; by < h; by++) {
    // Calculate the target y-coordinates for this logical row
    int y1 = startY + (int)(by * SCALE_Y);
    int y2 = startY + (int)((by + 1) * SCALE_Y);
    int block_h = y2 - y1;
    
    // Scan across the row bit by bit
    for (uint16_t bx = 0; bx < w; bx++) {
      // Calculate the target x-coordinates for this logical column
      int x1 = startX + (int)(bx * SCALE_X);
      int x2 = startX + (int)((bx + 1) * SCALE_X);
      int block_w = x2 - x1;
      
      // Get the current bit
      uint16_t byteOffset = (by * widthInBytes) + (bx / 8);
      uint8_t bitMask = 0x80 >> (bx & 7);
      bool bitSet = pgm_read_byte(bits + byteOffset) & bitMask;
      
      // If the bit is set, draw a block of pixels
      if (bitSet) {
        // Draw the block as a filled rectangle
        display.fillRect(x1, y1, block_w, block_h);
      }
    }
  }
}

uint16_t ST7789Display::getTextWidth(const char* str) {
  return display.getStringWidth(str) / SCALE_X;
}

void ST7789Display::endFrame() {
  display.display();
}

#endif