big refactoring and features added

App/Devices/lcd1602_display.h

@@ -0,0 +1,19 @@
+/**
+ * @file lcd1602_display.h
+ * @brief Minimal SPLC780D/HD44780-compatible LCD1602 driver in 4-bit mode.
+ *
+ * Architectural note:
+ * This module owns the LCD bus timing and character writes for the standalone
+ * front panel. High-level services format text elsewhere and call this driver
+ * only with already-prepared 16-character lines.
+ */
+
+#ifndef LCD1602_DISPLAY_H
+#define LCD1602_DISPLAY_H
+
+#include <stdint.h>
+
+void lcd1602_display_init(void);
+void lcd1602_display_set_lines(const char *line1, const char *line2);
+
+#endif /* LCD1602_DISPLAY_H */