abstracting display, touch and sd

display/low_level_display.h

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+#ifndef LOW_LEVEL_DISPLAY_H
+#define LOW_LEVEL_DISPLAY_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+// Display type enumeration
+typedef enum {
+    DISPLAY_TYPE_ST7796,
+    DISPLAY_TYPE_ST7789,
+    DISPLAY_TYPE_EPAPER
+} DisplayType;
+
+// Abstract display interface
+class LowLevelDisplay {
+public:
+    virtual ~LowLevelDisplay() {}
+    
+    // Core display operations - all work with 1-bit monochrome buffers
+    virtual bool init() = 0;
+    virtual void clear(bool white = true) = 0;  // Clear to white or black
+    virtual void draw_pixel(int x, int y, bool white) = 0;
+    virtual void draw_buffer(const uint8_t* bit_buffer) = 0;  // 1-bit buffer (width*height/8 bytes)
+    virtual void refresh() = 0;  // Update display (converts 1-bit to native format)
+    
+    // Display properties
+    virtual int get_width() const = 0;
+    virtual int get_height() const = 0;
+    virtual DisplayType get_type() const = 0;
+    virtual bool is_color() const = 0;
+    
+    // Optional: Backlight control (if supported)
+    virtual void set_backlight(bool on) { (void)on; }
+    
+    // Optional: Orientation control (not commonly needed for bitmap displays)
+    virtual void set_rotation(uint8_t rotation) { (void)rotation; }
+    
+    // Factory method - creates display based on type, using board_config.h for pins
+    static LowLevelDisplay* create(DisplayType type, int width, int height);
+};
+
+#endif // LOW_LEVEL_DISPLAY_H