diff --git a/src/graphic_loading.c b/src/graphic_loading.c
index cf80812..430755e 100644
--- a/src/graphic_loading.c
+++ b/src/graphic_loading.c
@@ -7,9 +7,192 @@
 #include "ssd1306.h"
 #include "user_interface.h"
 
+/* Tiny framebuffer */
+#define FBW DISPLAY_W
+#define FBH DISPLAY_H
+
+#define MIN(a,b) ((a)>(b)?(b):(a))
+#define MAX(a,b) ((a)>(b)?(a):(b))
+
+static uint8_t fb[(FBH/8)*FBW];
+
+/** Fill with a vertical pattern, 1 byte */
+void fb_fill(uint8_t pattern) {
+    memset(fb, pattern, sizeof(fb));
+}
+
+void fb_clear() {
+    fb_fill(0);
+}
+
+void fb_px(uint8_t x, uint8_t y, uint8_t color) {
+    if (x >= FBW || y >= FBH) return;
+    const uint8_t row = y / 8;
+    const uint8_t rowrem = y % 8;
+    const uint16_t cell = (uint16_t) x + (uint16_t) row * FBW;
+    if (color) {
+        fb[cell] |= (1 << rowrem);
+    } else {
+        fb[cell] &= ~(1 << rowrem);
+    }
+}
+
+void fb_hline(uint8_t x, uint8_t y, uint8_t w, uint8_t color) {
+    if (x >= FBW || y >= FBH) return;
+    w = MIN(FBW - x, w);
+    const uint8_t row = y / 8;
+    const uint8_t rowrem = y % 8;
+    uint16_t cell = (uint16_t) x + (uint16_t) row * FBW;
+    for(uint8_t i = 0; i < w; i++) {
+        if (color) {
+            fb[cell] |= (1 << rowrem);
+        } else {
+            fb[cell] &= ~(1 << rowrem);
+        }
+        cell++;
+    }
+}
+
+void fb_vline(uint8_t x, uint8_t y, uint8_t h, uint8_t color) {
+    if (x >= FBW || y >= FBH) return;
+    h = MIN(FBH - y - 1, h);
+    const uint8_t row = y / 8;
+    const uint8_t rowrem = y % 8;
+    uint16_t cell = (uint16_t) x + (uint16_t) row * FBW;
+
+    if (rowrem + h < 8) {
+        // all within one cell
+        uint8_t mask = (0xFF << rowrem) & (0xFF >> (h-rowrem));
+        if (color) {
+            fb[cell] |= mask;
+        } else {
+            fb[cell] &= ~mask;
+        }
+        return;
+    } else {
+        // First
+        uint8_t mask = (0xFF << rowrem);
+        if (color) {
+            fb[cell] |= mask;
+        } else {
+            fb[cell] &= ~mask;
+        }
+        h -= rowrem;
+
+        uint8_t whole_cells = h / 8;
+        h -= whole_cells * 8;
+        for(uint8_t i = 0; i < whole_cells; i++) {
+            cell += FBW;
+            if (color) {
+                fb[cell] = 0xFF;
+            } else {
+                fb[cell] = 0;
+            }
+        }
+
+        // last
+        mask = (0xFF >> (8-h));
+        if (color) {
+            fb[cell] |= mask;
+        } else {
+            fb[cell] &= ~mask;
+        }
+    }
+}
+
+void fb_rect(uint8_t x, uint8_t y, uint8_t w, uint8_t h, uint8_t color) {
+    if (x >= FBW || y >= FBH) return;
+    w = MIN(FBW - x - 1, w);
+    h = MIN(FBH - y - 1, h);
+    const uint8_t row = y / 8;
+    const uint8_t rowrem = y % 8;
+    uint16_t cell = (uint16_t) x + (uint16_t) row * FBW;
+
+    if (rowrem + h < 8) {
+        // all within one cell
+        uint8_t mask = (0xFF << rowrem) & (0xFF >> (h-rowrem));
+
+        for(uint8_t i = 0; i < w; i++) {
+            if (color) {
+                fb[cell + i] |= mask;
+            } else {
+                fb[cell + i] &= ~mask;
+            }
+        }
+        return;
+    } else {
+        // First
+        uint8_t mask = (0xFF << rowrem);
+        for(uint8_t i = 0; i < w; i++) {
+            if (color) {
+                fb[cell + i] |= mask;
+            } else {
+                fb[cell + i] &= ~mask;
+            }
+        }
+        h -= rowrem;
+
+        uint8_t whole_cells = h / 8;
+        h -= whole_cells * 8;
+        for(uint8_t j = 0; j < whole_cells; j++) {
+            cell += FBW;
+            for(uint8_t i = 0; i < w; i++) {
+                if (color) {
+                    fb[cell + i] = 0xFF;
+                } else {
+                    fb[cell + i] = 0;
+                }
+            }
+        }
+
+        // last
+        mask = (0xFF >> (8-h));
+        for(uint8_t i = 0; i < w; i++) {
+            if (color) {
+                fb[cell + i] |= mask;
+            } else {
+                fb[cell + i] &= ~mask;
+            }
+        }
+    }
+}
+
+void fb_blit() {
+    ssd1306_drawBuffer(0, 0, FBW, FBH, fb);
+}
+
 
 void show_loading_screen(uint8_t progress_percent, bool clear)
 {
+    // HACKS - GUI dev here
+
+    fb_clear();
+    fb_blit();
+//
+//    fb_hline(3, 3, 30, 1);
+//    fb_hline(3, 15, 35, 1);
+//    fb_hline(3, 30, 40, 1);
+//
+//    fb_vline(5, 0, 15, 1);
+//    fb_vline(6, 0, 32, 0);
+
+    fb_rect(10, 10, 30, 3, 1);
+    fb_rect(40, 13, 3, 10, 1);
+//
+//    fb_rect(0, 0, 10, 10, 1);
+//
+//    fb_rect(7, 20, 20, 1, 1);
+//    fb_rect(7, 23, 20, 3, 1);
+
+    //fb_rect(15, 0, 5, 20, 0);
+
+    fb_blit();
+
+
+
+    for(;;){}
+
+
     if (clear) {
         ssd1306_clearScreen();
     }