abstracting display, touch and sd

display/low_level_display_st7789.h

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+#ifndef LOW_LEVEL_DISPLAY_ST7789_H
+#define LOW_LEVEL_DISPLAY_ST7789_H
+
+#include "low_level_display.h"
+
+// ST7789 configuration structure (similar to ST7796)
+struct st7789_config {
+    void* spi;           // SPI instance
+    int gpio_din;        // MOSI pin
+    int gpio_clk;        // Clock pin
+    int gpio_cs;         // Chip select pin
+    int gpio_dc;         // Data/Command pin
+    int gpio_rst;        // Reset pin
+    int gpio_bl;         // Backlight pin
+};
+
+class LowLevelDisplayST7789 : public LowLevelDisplay {
+private:
+    const st7789_config* config;
+    int width;
+    int height;
+    bool initialized;
+    
+public:
+    LowLevelDisplayST7789(const st7789_config* cfg, int w, int h);
+    ~LowLevelDisplayST7789() override;
+    
+    // Core display operations - converts 1-bit to RGB565 internally
+    bool init() override;
+    void clear(bool white = true) override;
+    void draw_pixel(int x, int y, bool white) override;
+    void draw_buffer(const uint8_t* bit_buffer) override;
+    void refresh() override;
+    
+    // Display properties
+    int get_width() const override { return width; }
+    int get_height() const override { return height; }
+    DisplayType get_type() const override { return DISPLAY_TYPE_ST7789; }
+    bool is_color() const override { return true; }
+    
+    // Backlight control
+    void set_backlight(bool on) override;
+    
+    // Orientation control
+    void set_rotation(uint8_t rotation) override;
+};
+
+#endif // LOW_LEVEL_DISPLAY_ST7789_H