restrcuct

.gitignore

@@ -1 +1,2 @@
 .DS_Store
+/build

include/String.h

@@ -0,0 +1,62 @@
+#define CUSTOM_STRING_MAX_LEN 64
+
+typedef struct {
+    char buffer[CUSTOM_STRING_MAX_LEN];
+    int length;  // current string length, excluding null terminator
+} String;
+
+// Initialize String to empty
+void cs_init(String* cs)
+{
+    cs->buffer[0] = '\0';
+    cs->length = 0;
+}
+
+// Set content from a C-string (truncates if needed)
+void cs_set(String* cs, const char* src)
+{
+    int i = 0;
+    while (src[i] != '\0' && i < (CUSTOM_STRING_MAX_LEN - 1))
+    {
+        cs->buffer[i] = src[i];
+        i++;
+    }
+    cs->buffer[i] = '\0';
+    cs->length = i;
+}
+
+// Compare two Strings for equality
+int cs_equal(const String* a, const String* b)
+{
+    if (a->length != b->length)
+        return 0;
+    for (int i = 0; i < a->length; i++)
+    {
+        if (a->buffer[i] != b->buffer[i])
+            return 0;
+    }
+    return 1;
+}
+
+// Check if String starts with another String prefix
+int cs_starts_with(const String* cs, const String* prefix)
+{
+    if (prefix->length > cs->length)
+        return 0;
+    for (int i = 0; i < prefix->length; i++)
+    {
+        if (cs->buffer[i] != prefix->buffer[i])
+            return 0;
+    }
+    return 1;
+}
+
+// Append a char to String (ignores if full)
+void cs_append_char(String* cs, char c)
+{
+    if (cs->length < (CUSTOM_STRING_MAX_LEN - 1))
+    {
+        cs->buffer[cs->length++] = c;
+        cs->buffer[cs->length] = '\0';
+    }
+}

include/font_pack.h

@@ -1,3 +1,4 @@
+#pragma once
 #ifndef FONT_PACK_H
 #define FONT_PACK_H
 #include <stdint.h>

include/renderer_common.h

@@ -0,0 +1,46 @@
+#ifndef RENDERER_COMMON_H
+#define RENDERER_COMMON_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define FONT_WIDTH 16
+#define FONT_HEIGHT 16
+
+typedef struct {
+    unsigned int x, y;
+    unsigned int color;
+} RenderBase;
+
+typedef struct {
+    RenderBase base;
+    const char *text;
+    void *font; // Opaque font pointer
+} RenderText;
+
+typedef struct {
+    unsigned int x, y;
+    unsigned int width, height;
+    unsigned int color;
+} RenderObject;
+
+typedef struct Renderer Renderer;
+
+struct Renderer {
+    volatile unsigned int *fb;
+    unsigned int width;
+    unsigned int height;
+    unsigned int pitch;
+
+    bool (*init)(Renderer *renderer);
+
+    void (*clear_screen)(Renderer *renderer, unsigned int color);
+    void (*draw_text)(Renderer *renderer, RenderText *text_obj);
+};
+
+/**
+ * Initializes the framebuffer (common across both renderers)
+ */
+bool renderer_init_common(Renderer *renderer);
+
+#endif // RENDERER_COMMON_H

makefile

@@ -6,17 +6,17 @@ AS = $(CROSS)as
 LD = $(CROSS)ld
 OBJCOPY = $(CROSS)objcopy
 
-CFLAGS = -O2 -ffreestanding -nostdlib -Wall -Wextra
-LDFLAGS = -T src/linker.ld
+CFLAGS = -O2 -ffreestanding -nostdlib -Wall -Wextra -Iinclude include/
+LDFLAGS = -T src/boot/linker.ld
 
 SRC = src
 BUILD = build
 
 # List all C source files here (update as needed)
-SOURCES_C = $(SRC)/renderer.c  $(SRC)/font_pack.c $(SRC)/main.c
+SOURCES_C = $(SRC)/renderer.c   $(SRC)/font_pack.c $(SRC)/main.c 
 
 # List assembler source files
-SOURCES_ASM = $(SRC)/boot.s
+SOURCES_ASM = $(SRC)/boot/boot.s
 
 # Object files (one per source file)
 OBJ_C = $(patsubst $(SRC)/%.c,$(BUILD)/%.o,$(SOURCES_C))
@@ -32,6 +32,7 @@ all: $(TARGET_IMG)
 # Create build directory if it does not exist
 $(BUILD):
 	mkdir -p $(BUILD)
+	mkdir -p $(BUILD)/boot
 
 # Assemble assembly sources
 $(BUILD)/%.o: $(SRC)/%.s | $(BUILD)
@@ -54,4 +55,4 @@ clean:
 
 # Run QEMU emulator for Raspberry Pi 3 with serial output redirected to terminal
 run: $(TARGET_IMG)
-	sudo qemu-system-aarch64 -M raspi3b -serial stdio -kernel $(TARGET_IMG)
+	qemu-system-aarch64 -M raspi3b -serial stdio -kernel $(TARGET_IMG)

src/main.c

@@ -2,9 +2,30 @@
 #include "color.h"
 #include "font_pack.h"
 #include "io.h"
+#include "String.h"
+
+static void delay_1s(void)
+{
+    volatile unsigned long count = 80000000; // Example for ~1 sec at ~80 MHz CPU
+    while (count--)
+    {
+        __asm__ volatile("nop");
+    }
+}
+
+void delay_seconds(unsigned int seconds)
+{
+    for (unsigned int i = 0; i < seconds; i++)
+    {
+        delay_1s();
+    }
+}
 
 int kernel_main(void)
 {
+    String str;
+    cs_init(&str);
+    cs_set(&str, "HELLO MARIO");
     uart_io.puts("Initializing renderer...\n");
 
     Renderer renderer;
@@ -23,48 +44,38 @@ int kernel_main(void)
     uart_io.putc('\n');
 
     RenderObject background = {0, 0, renderer.width, renderer.height, COLOR_RED};
-    RenderObject blue_rect = {100, 100, 100, 100, COLOR_BLUE};
-
     RenderText text = {
         .base = {
             .x = 20,
             .y = 30,
             .color = 0xFFFFFFFF},
-        .text = "HELLO MARIO",
+        .text = str.buffer,
         .font = &basic_font_pack,
     };
-    uart_io.puts("Use WASD keys to move the rectangle.\n");
-
-    // Initial draw
-    renderer.clear_screen(&renderer, background.color);
-    renderer.draw_rect(&renderer, &blue_rect);
-    renderer.draw_text(&renderer, &text);
 
     while (1)
     {
-        char c = uart_io.getc();
-        uart_io.putc(c); 
-
-        // Movement
-        if ((c == 'w' || c == 'W') && blue_rect.y > 0)
-            blue_rect.y = (blue_rect.y > 10) ? blue_rect.y - 10 : 0;
-        if ((c == 's' || c == 'S') && (blue_rect.y + blue_rect.height) < renderer.height)
-            blue_rect.y += 10;
-        if ((c == 'a' || c == 'A') && blue_rect.x > 0)
-            blue_rect.x = (blue_rect.x > 10) ? blue_rect.x - 10 : 0;
-        if ((c == 'd' || c == 'D') && (blue_rect.x + blue_rect.width) < renderer.width)
-            blue_rect.x += 10;
-
-        // Redraw everything
         renderer.clear_screen(&renderer, background.color);
-        renderer.draw_rect(&renderer, &blue_rect);
         renderer.draw_text(&renderer, &text);
 
-        // Print updated position
-        uart_io.puts("\nRect X: ");
-        uart_io.print_int(blue_rect.x);
-        uart_io.puts(" Y: ");
-        uart_io.print_int(blue_rect.y);
-        uart_io.putc('\n');
+        char c = uart_getc();
+
+        if (c >= 32 && c <= 126) // Printable ASCII
+        {
+            cs_append_char(&str, c);
+        }
+        else if (c == '\b' || c == 127) // Backspace support
+        {
+            if (str.length > 0)
+            {
+                str.length--;
+                str.buffer[str.length] = '\0';
+            }
+        }
+
+        uart_puts(str.buffer);
+        renderer.draw_text(&renderer, &text);
+
+        delay_seconds(4);
     }
 }