klips/esp/cpp/07_lcd-panel/main/display.h

#ifndef DISPLAY_H
#define DISPLAY_H

#include <esp_lcd_types.h>
#include <esp_lcd_panel_ssd1306.h>
#include <driver/i2c_types.h>
#include <driver/i2c_master.h>
#include <unordered_map>
#include "misc/lv_types.h"
#include "misc/lv_area.h"
#include "display/lv_display.h"
#include "widgets/label/lv_label.h"

#define I2C_BUS_PORT  0
#define LVGL_TICK_PERIOD_MS    5
#define LVGL_TASK_STACK_SIZE   (4 * 1024)
#define LVGL_TASK_PRIORITY     2
#define LVGL_PALETTE_SIZE      8

static const char *TAG = "lcd-panel";

// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
// According to SSD1306 datasheet
// Bit number used to represent command and parameter
#define SCREEN_WIDTH           128  // OLED display width, in pixels
#define SCREEN_HEIGHT          64  // OLED display height, in pixels
#define LCD_H_RES              SCREEN_WIDTH
#define LCD_V_RES              SCREEN_HEIGHT
#define I2C_HW_ADDR            0x3C
#define LCD_PIXEL_CLOCK_HZ     (400 * 1000)
#define LCD_CMD_BITS           8
#define LCD_PARAM_BITS         8

// Pin may vary based on your schematic
#define PIN_SDA                GPIO_NUM_21
#define PIN_SCL                GPIO_NUM_22
#define PIN_RST                -1

struct I2C {
  I2C();

  ~I2C() = default;

  i2c_master_bus_handle_t i2c_bus_;
};

struct ScopedLock {
  explicit ScopedLock() { _lock_acquire(&lock_); }

  ~ScopedLock() { _lock_release(&lock_); }

  // LVGL library is not thread-safe, this example calls LVGL APIs from tasks.
  // We must use a mutex to protect it.
  static _lock_t lock_;
};

class Panel {
public:
  explicit Panel(i2c_master_bus_handle_t i2c);

  explicit Panel(const I2C &i2c) : Panel(i2c.i2c_bus_) { }

  ~Panel() = default;

  [[nodiscard]] inline const esp_lcd_panel_t *get() const { return panel_; }

  [[nodiscard]] inline esp_lcd_panel_t *get() { return panel_; }

  [[nodiscard]] inline const esp_lcd_panel_t *
  operator*() const { return get(); }

  [[nodiscard]] inline esp_lcd_panel_t *operator*() { return get(); }

  esp_lcd_panel_io_handle_t io_handle_;

  esp_lcd_panel_handle_t panel_;

private:
  esp_lcd_panel_dev_config_t panel_config_;

  esp_lcd_panel_ssd1306_config_t ssd1306_config_;
};

class Display {
public:
  explicit Display(const I2C &i2c);

  ~Display() = default;

  [[nodiscard]] inline const lv_display_t *get() const { return display_; }

  [[nodiscard]] inline lv_display_t *get() { return display_; }

  [[nodiscard]] inline const lv_display_t *operator*() const { return get(); }

  [[nodiscard]] inline lv_display_t *operator*() { return get(); }

  void set_text(const char *text,
                const char *name,
                lv_label_long_mode_t long_mode = LV_LABEL_LONG_SCROLL_CIRCULAR,
                lv_align_t align = LV_ALIGN_TOP_MID);

  static bool lvgl_flush_ready(esp_lcd_panel_io_handle_t panel,
                               esp_lcd_panel_io_event_data_t *data,
                               void *user_ctx);

  static void lvgl_flush_cb(lv_display_t *display,
                            const lv_area_t *area,
                            uint8_t *px_map);

  static void lvgl_increase_tick(void *arg);

  static void lvgl_port_task(void *arg);

  // For LV_COLOR_FORMAT_I1 we need an extra buffer to hold the converted data.
  static uint8_t oled_buffer_[LCD_H_RES * LCD_V_RES / 8];

private:
  Panel panel_;

  lv_display_t *display_;

  void *buf_;

  std::unordered_map<const char *, lv_obj_t *> objects_;
};

//class SSD1306 : public Display {
//public:
//  SSD1306();
//
//  void * vendor_config() override;
//
//private:
//  esp_lcd_panel_dev_config_t panel_config_;
//  esp_lcd_panel_ssd1306_config_t ssd1306_config_;
//};

#endif // DISPLAY_H