Sample: Porting LovyanGFX to 'Seeed Studio Round Display for XIAO' with XIAO ESP32S3

main.cpp

#include <math.h>
#include <Arduino.h>
#define LGFX_USE_V1
#include <SPIFFS.h>
#include <LovyanGFX.hpp>

namespace {

struct Touch_XiaoRound : public lgfx::v1::ITouch {
  Touch_XiaoRound() {
    _cfg.x_min = _cfg.y_min = 0;
    _cfg.x_max = _cfg.y_max = 239;
    _cfg.i2c_addr = 0x2e;
  }
  bool init() override {
    if (isSPI()) {
      return false;
    }
    if (_cfg.pin_int >= 0) {
      lgfx::pinMode(_cfg.pin_int, lgfx::v1::pin_mode_t::input_pullup);
    }
    return lgfx::i2c::init(_cfg.i2c_port, _cfg.pin_sda, _cfg.pin_scl).has_value();
  }
  void wakeup() override {}
  void sleep() override {}

  uint_fast8_t getTouchRaw(lgfx::v1::touch_point_t *tp, uint_fast8_t count) override {
    tp[0].size = 0;
    tp[0].id = 0;
    if (_cfg.pin_int < 0) {
      return 0;
    }
    //FIXME:
    if ((bool)lgfx::gpio_in(_cfg.pin_int)) {
      ::delay(10);
      if ((bool)lgfx::gpio_in(_cfg.pin_int)) {
        return 0;
      }
    }
    uint8_t buf[5];
    if (!lgfx::i2c::transactionRead(_cfg.i2c_port, _cfg.i2c_addr, buf, 5, _cfg.freq).has_value()) {
      return 0;
    }
    if (buf[0] != 1) {
      return 0;
    }
    tp[0].x = buf[2];
    tp[0].y = buf[4];
    tp[0].size = 1;
    return 1;
  }
};

class XiaoRoundDisplay : public lgfx::LGFX_Device {
  lgfx::Panel_GC9A01 _panel;
  lgfx::Bus_SPI _bus;
  lgfx::Light_PWM _light;
  Touch_XiaoRound _touch;

 public:
  XiaoRoundDisplay() {
    auto bus_cfg = _bus.config();
    bus_cfg.spi_host = SPI3_HOST;
    bus_cfg.spi_mode = 0;
    bus_cfg.freq_write = 40000000;
    bus_cfg.freq_read  = 20000000;
    bus_cfg.spi_3wire  = true;
    bus_cfg.use_lock   = true;
    bus_cfg.dma_channel = 0;
    bus_cfg.pin_sclk = 7;
    bus_cfg.pin_mosi = 9;
    bus_cfg.pin_miso = 8;
    bus_cfg.pin_dc   = 4;
    _bus.config(bus_cfg);
    _panel.setBus(&_bus);

    auto panel_cfg = _panel.config();
    panel_cfg.pin_cs =  2;
    panel_cfg.pin_rst = -1;
    panel_cfg.pin_busy = -1;
    panel_cfg.memory_width = 240;
    panel_cfg.memory_height = 240;
    panel_cfg.panel_width = 240;
    panel_cfg.panel_height = 240;
    panel_cfg.offset_x = 0;
    panel_cfg.offset_y = 0;
    panel_cfg.offset_rotation = 0;
    panel_cfg.dummy_read_pixel = 8;
    panel_cfg.dummy_read_bits  = 1;
    panel_cfg.readable = false;
    panel_cfg.invert = true;
    panel_cfg.rgb_order = false;
    panel_cfg.dlen_16bit = false;
    panel_cfg.bus_shared =  true;
    _panel.config(panel_cfg);

    auto light_cfg = _light.config();
    light_cfg.pin_bl = 43;
    light_cfg.invert = false;
    light_cfg.freq = 44100;
    light_cfg.pwm_channel = 7;
    _light.config(light_cfg);
    _panel.setLight(&_light);

    auto touch_cfg = _touch.config(); 
    touch_cfg.pin_int = 44;

    touch_cfg.i2c_port = 0;
    touch_cfg.pin_sda  = 5;
    touch_cfg.pin_scl  = 6;
    touch_cfg.freq = 400000;

    _touch.config(touch_cfg);
    _panel.setTouch(&_touch);

    setPanel(&_panel);
  }
} display;

LGFX_Sprite record(&display);
float angle = -1.f;

void draw(float curr) {
  if (curr == angle) {
   return;
  }
  curr = ::fmod(curr, 360.f);
  if (curr < 0.f) {
    curr += 360.f;
  } else if (curr >= 360.f) {
    curr -= 360.f;
  }

  angle = curr;
  display.startWrite();
  record.pushRotateZoom(
    record.width() / 2, record.height() / 2, angle, 1.f, 1.f, TFT_BLACK);
  display.endWrite();
  display.waitDisplay();
}

float calcAngle(float x1, float y1, float x2, float y2) {
  return ::atan2(x1 * y2 - y1 * x2, x1 * x2 + y1 * y2) * 180.f / PI;
}

}  // namespace

void setup() {
  SPIFFS.begin();

  display.init();
  record.createSprite(240, 240);
  // need sample.bmp(240x240 pixels) on SPIFFS
  record.drawBmpFile(SPIFFS, "/sample.bmp", 0, 0);

  draw(0.f);
}

void loop() {
  static bool hold = false;
  static int32_t _lastx, _lasty;

  int32_t x, y;
  if (display.getTouch(&x, &y)) {
    x -= display.width() / 2;
    y -= display.height() / 2;
    if (hold) {
      auto delta = calcAngle(_lastx, _lasty, x, y);
      if (!::isnan(delta)) {
        ::draw(angle + delta);
      }
    } else {
      hold = true;
    }
    _lastx = x;
    _lasty = y;
  } else if (hold) {
    hold = false;
  }
}