- use LovyanGFX for m5stack

- update some comments

src/graphics/TFTDisplay.cpp

@@ -217,7 +217,96 @@ class LGFX : public lgfx::LGFX_Device
 
 static LGFX tft;
 
-#elif defined(ST7735_CS) || defined(ILI9341_DRIVER)
+#elif defined(ILI9341_DRIVER)
+
+#include <LovyanGFX.hpp> // Graphics and font library for ILI9341 driver chip
+
+#if defined(ILI9341_BACKLIGHT_EN) && !defined(TFT_BL)
+#define TFT_BL ILI9341_BACKLIGHT_EN
+#endif
+
+class LGFX : public lgfx::LGFX_Device
+{
+    lgfx::Panel_ILI9341 _panel_instance;
+    lgfx::Bus_SPI _bus_instance;
+    lgfx::Light_PWM _light_instance;
+
+  public:
+    LGFX(void)
+    {
+        {
+            auto cfg = _bus_instance.config();
+
+            // configure SPI
+            cfg.spi_host = ILI9341_SPI_HOST; // ESP32-S2,S3,C3 : SPI2_HOST or SPI3_HOST / ESP32 : VSPI_HOST or HSPI_HOST
+            cfg.spi_mode = 0;
+            cfg.freq_write = SPI_FREQUENCY; // SPI clock for transmission (up to 80MHz, rounded to the value obtained by dividing
+                                            // 80MHz by an integer)
+            cfg.freq_read = SPI_READ_FREQUENCY; // SPI clock when receiving
+            cfg.spi_3wire = false;              // Set to true if reception is done on the MOSI pin
+            cfg.use_lock = true;                // Set to true to use transaction locking
+            cfg.dma_channel = SPI_DMA_CH_AUTO;  // SPI_DMA_CH_AUTO; // Set DMA channel to use (0=not use DMA / 1=1ch / 2=ch /
+                                                // SPI_DMA_CH_AUTO=auto setting)
+            cfg.pin_sclk = TFT_SCLK;         // Set SPI SCLK pin number
+            cfg.pin_mosi = TFT_MOSI;         // Set SPI MOSI pin number
+            cfg.pin_miso = TFT_MISO;        // Set SPI MISO pin number (-1 = disable)
+            cfg.pin_dc = TFT_DC;            // Set SPI DC pin number (-1 = disable)
+
+            _bus_instance.config(cfg);              // applies the set value to the bus.
+            _panel_instance.setBus(&_bus_instance); // set the bus on the panel.
+        }
+
+        {                                        // Set the display panel control.
+            auto cfg = _panel_instance.config(); // Gets a structure for display panel settings.
+
+            cfg.pin_cs = TFT_CS;     // Pin number where CS is connected (-1 = disable)
+            cfg.pin_rst = TFT_RST; // Pin number where RST is connected  (-1 = disable)
+            cfg.pin_busy = TFT_BUSY; // Pin number where BUSY is connected (-1 = disable)
+
+            // The following setting values ​​are general initial values ​​for each panel, so please comment out any
+            // unknown items and try them.
+
+            cfg.panel_width = TFT_WIDTH;   // actual displayable width
+            cfg.panel_height = TFT_HEIGHT; // actual displayable height
+            cfg.offset_x = TFT_OFFSET_X;   // Panel offset amount in X direction
+            cfg.offset_y = TFT_OFFSET_Y;   // Panel offset amount in Y direction
+            cfg.offset_rotation = 0;       // Rotation direction value offset 0~7 (4~7 is upside down)
+            cfg.dummy_read_pixel = 8;      // Number of bits for dummy read before pixel readout
+            cfg.dummy_read_bits = 1;       // Number of bits for dummy read before non-pixel data read
+            cfg.readable = true;           // Set to true if data can be read
+            cfg.invert = false;             // Set to true if the light/darkness of the panel is reversed
+            cfg.rgb_order = false;         // Set to true if the panel's red and blue are swapped
+            cfg.dlen_16bit =
+                false;             // Set to true for panels that transmit data length in 16-bit units with 16-bit parallel or SPI
+            cfg.bus_shared = true; // If the bus is shared with the SD card, set to true (bus control with drawJpgFile etc.)
+            
+            // Set the following only when the display is shifted with a driver with a variable number of pixels, such as the
+            // ST7735 or ILI9163.
+            cfg.memory_width = TFT_WIDTH;   // Maximum width supported by the driver IC
+            cfg.memory_height = TFT_HEIGHT; // Maximum height supported by the driver IC
+            _panel_instance.config(cfg);
+        }
+
+        // Set the backlight control
+        {
+            auto cfg = _light_instance.config(); // Gets a structure for backlight settings.
+
+            cfg.pin_bl = TFT_BL; // Pin number to which the backlight is connected
+            cfg.invert = false;      // true to invert the brightness of the backlight
+            // cfg.freq = 44100;    // PWM frequency of backlight
+            // cfg.pwm_channel = 1; // PWM channel number to use
+
+            _light_instance.config(cfg);
+            _panel_instance.setLight(&_light_instance); // Set the backlight on the panel.
+        }
+
+        setPanel(&_panel_instance);
+    }
+};
+
+static LGFX tft;
+
+#elif defined(ST7735_CS)
 #include <TFT_eSPI.h> // Graphics and font library for ILI9341 driver chip
 
 static TFT_eSPI tft = TFT_eSPI(); // Invoke library, pins defined in User_Setup.h
@@ -335,9 +424,9 @@ bool TFTDisplay::connect()
 #endif
 
     tft.init();
-#if defined(M5STACK) || defined(T_DECK)
+#if defined(T_DECK)
     tft.setRotation(1); // M5Stack/T-Deck have the TFT in landscape
-#elif defined(T_WATCH_S3)
+#elif defined(M5STACK) || defined(T_WATCH_S3)
     tft.setRotation(0); // T-Watch S3 has the TFT in portrait
 #else
     tft.setRotation(3); // Orient horizontal and wide underneath the silkscreen name label