diff --git a/avr.Makefile b/avr.Makefile
index b670676..61f5651 100644
--- a/avr.Makefile
+++ b/avr.Makefile
@@ -49,6 +49,7 @@ LDFLAGS = -Llib -lssd1306
 #==== Programming Options (avrdude) ============================================
 
 AVRDUDE_PROGRAMMER = arduino
+AVRDUDE_PORT = /dev/arduinoACM
 AVRDUDE_BAUD = 115200
 
 #AVRDUDE_NO_VERIFY = -V
diff --git a/inc/col.h b/inc/col.h
index 6ca0c68..9fe8675 100644
--- a/inc/col.h
+++ b/inc/col.h
@@ -2,10 +2,13 @@
 #ifndef _COL_H_
 #define _COL_H_
 
-class Node;
-typedef void (*drawfun_t)(int offset, int size, Node*);
+class canvas;
+#include "gfx/canvas.h"
 
-void draw_menu(int, int, Node*);
+class Node;
+typedef void (*drawfun_t)(int offset, int size, Node*, canvas& c);
+
+void draw_menu(int, int, Node*, canvas& c);
 
 class Drawable{
 	public:
diff --git a/inc/example.h b/inc/example.h
index d9d3730..213b6d5 100644
--- a/inc/example.h
+++ b/inc/example.h
@@ -2,8 +2,10 @@
 #ifndef _EXAMPLE_H_
 #define _EXAMPLE_H_
 
-void draw_foo(int offset, int size, Node* ptr);
+#include "gfx/canvas.h"
 
-void draw_blub(int offset, int size, Node* ptr);
+void draw_foo(int offset, int size, Node* ptr, canvas& c);
+
+void draw_blub(int offset, int size, Node* ptr, canvas& c);
 
 #endif
diff --git a/inc/gfx/buffer_1.h b/inc/gfx/buffer_1.h
new file mode 100644
index 0000000..3ce889b
--- /dev/null
+++ b/inc/gfx/buffer_1.h
@@ -0,0 +1,40 @@
+//
+// Created by jedi on 11/2/18.
+//
+
+#ifndef MGL_DMXMENU_BUFFER_1_H
+#define MGL_DMXMENU_BUFFER_1_H
+
+
+#include <stdlib.h>
+#include <stdint.h>
+
+class buffer_1 {
+private:
+    int *ptr_;
+    int size_;
+    constexpr static const int block_ = 8 * sizeof(int);
+public:
+    buffer_1(int size) : size_(size) {
+        ptr_ = (int *) malloc(size * sizeof(int));
+    }
+
+    bool get(int i) {
+        if (i >= size_) return 0;
+        return ptr_[i/block_] & 1 << (i%block_);
+    }
+
+    void set(int i, bool v) {
+        if (i < size_) {
+            ptr_[i/block_] &= ~(1 << (i%block_));
+            ptr_[i/block_] |= v << (i%block_);
+        }
+    }
+
+    ~buffer_1() {
+        free(ptr_);
+    }
+};
+
+
+#endif //MGL_DMXMENU_BUFFER_1_H
diff --git a/inc/gfx/buffer_32.h b/inc/gfx/buffer_32.h
new file mode 100644
index 0000000..751c868
--- /dev/null
+++ b/inc/gfx/buffer_32.h
@@ -0,0 +1,37 @@
+//
+// Created by jedi on 11/2/18.
+//
+
+#ifndef MGL_DMXMENU_BUFFER_8_H
+#define MGL_DMXMENU_BUFFER_8_H
+
+
+#include <stdlib.h>
+#include <stdint.h>
+
+class buffer_32 {
+private:
+    int size_;
+    void *ptr;
+public:
+    buffer_32(int size) : size_(size) {
+        ptr = (uint8_t *) malloc(size * 4);
+    }
+
+    bool get(int i) {
+        if (i >= size_) return 0;
+        return ((int *) ptr)[i];
+    }
+
+    void set(int i, bool v) {
+        if (i < size_)
+            ((int *) ptr)[i] = v;
+    }
+
+    ~buffer_32() {
+        free(ptr);
+    }
+};
+
+
+#endif //MGL_DMXMENU_BUFFER_8_H
diff --git a/inc/gfx/canvas.h b/inc/gfx/canvas.h
index 48d4a04..0ee451e 100644
--- a/inc/gfx/canvas.h
+++ b/inc/gfx/canvas.h
@@ -8,19 +8,31 @@
 #include "hal.h"
 #include "gfx/font.h"
 #include "fonts/basic_5x4.h"
+#include "gfx/buffer_1.h"
+#include "gfx/buffer_32.h"
+
+class screen;
 
 class canvas {
 private:
     const int width_;
     const int height_;
+    buffer_1 buffer_;
+
+    void draw_onto_(screen &);
+
 public:
     canvas(int w, int h);
 
+    void clear();
+
     void draw(int x, int y);
 
-    void print(int x, int y, const char *str, font& = basic_5x4);
+    void print(int x, int y, const char *str, font & = basic_5x4);
 
-    void print(int x, int y, char *str, font& = basic_5x4);
+    void print(int x, int y, char *str, font & = basic_5x4);
+
+    friend screen;
 };
 
 
diff --git a/inc/gfx/screen.h b/inc/gfx/screen.h
index 2c14a77..ebdaec7 100644
--- a/inc/gfx/screen.h
+++ b/inc/gfx/screen.h
@@ -7,7 +7,6 @@
 
 #include "hal.h"
 
-//template <int WIDTH, int HEIGHT>
 class screen {
 private:
     const int width_;
@@ -22,6 +21,13 @@ public:
         hal_draw(x,y);
     }
 
+    void draw(int x, int y, canvas& c){
+        for (int x_ = 0; x_ < 128; x_++)
+            for (int y_ = 0; y_ < 32; y_++)
+                if(c.buffer_.get(x_*32+y_))
+                    hal_draw(x+x_,y+y_);
+    }
+
     void print(int x, int y, char* str){
 
     }
diff --git a/inc/hal.h b/inc/hal.h
index 3eb0af0..a692c64 100644
--- a/inc/hal.h
+++ b/inc/hal.h
@@ -2,6 +2,7 @@
 #ifndef _HAL_H_
 #define _HAL_H_
 
+class Layout;
 #include "col.h"
 
 #define I_LEFT 0
diff --git a/src/col.cpp b/src/col.cpp
index 058bf4f..bdb036e 100644
--- a/src/col.cpp
+++ b/src/col.cpp
@@ -1,57 +1,62 @@
 
+#include <gfx/screen.h>
 #include "hal.h"
 #include "col.h"
 
 
 
-void Layout::render(){
-	for(int j = 0; j < allocated_; j++){
-		Node * node;
-		if((node = slots[j].node) && node->view.render){
-			node->view.render(slots[j].pos_,slots[j].size_,node);
+void Layout::render() {
+	for (int j = 0; j < allocated_; j++) {
+		Node *node;
+		if ((node = slots[j].node) && node->view.render) {
+			screen s(128, 32);
+			canvas c(slots[j].size_, 32);
+			node->view.render(slots[j].pos_, slots[j].size_, node, c);
+			s.draw(slots[j].pos_, 0, c);
+
 		}
 	}
 }
 
-int Layout::apply(Node* node){
+int Layout::apply(Node* node) {
 	int rootslot = allocate_(node, maxslots);
 	int minsize = pack_(rootslot);
 	expand_(minsize);
 	return 0;
 }
 
-int Layout::pack_(int usedslots){
+int Layout::pack_(int usedslots) {
 	int minsum = 0;
 	int i;
-	for(i = 0; i<usedslots; i++){
-		if(!slots[i].node) break;
-		if(minsum+slots[i].node->view.minsize>maxwidth_) break;
-		minsum+=slots[i].node->view.minsize;
+	for (i = 0; i < usedslots; i++) {
+		if (!slots[i].node) break;
+		if (minsum + slots[i].node->view.minsize > maxwidth_) break;
+		minsum += slots[i].node->view.minsize;
 	}
 	allocated_ = i;
 	return minsum;
 }
 
-int Layout::expand_(int packedsize){
+int Layout::expand_(int packedsize) {
 	int diff = maxwidth_ - packedsize;
 	int pos = 0;
-	for(int i = allocated_-1; i>=0; i--){
-		slots[i].pos_=pos;
-		int size = slots[i].node->view.minsize + (diff*slots[i].node->view.minsize)/packedsize;
-		if(size > slots[i].node->view.maxsize)
+	for (int i = allocated_ - 1; i >= 0; i--) {
+		slots[i].pos_ = pos;
+		int size = slots[i].node->view.minsize + (diff * slots[i].node->view.minsize) / packedsize;
+		if (size > slots[i].node->view.maxsize)
 			size = slots[i].node->view.maxsize;
-		slots[i].size_=size;
-		pos+=size;
+		slots[i].size_ = size;
+		pos += size;
 	}
 	return 0;
 }
 
-int Layout::allocate_(Node* node, int depth){
-	if(Node* next = node->getChild()){
+int Layout::allocate_(Node* node, int depth) {
+	if (Node *next = node->getChild()) {
 		int i = allocate_(next, depth) + 1;
 		slots[i].node = node;
 		return i;
-	}else{
+	} else {
 		slots[0].node = node;
 		return 0;
 	}
diff --git a/src/example.cpp b/src/example.cpp
index 101da8c..566af6b 100644
--- a/src/example.cpp
+++ b/src/example.cpp
@@ -1,29 +1,23 @@
 
-#include "hal.h"
 #include "col.h"
 #include "example.h"
-#include "../inc/hal.h"
+#include "gfx/canvas.h"
 
 char peng[] = {'_','_','_','_','_',0};
 
 int j = 0;
 
-void draw_foo(int offset, int size, Node* ptr){
+void draw_foo(int offset, int size, Node* ptr, canvas& c){
 	Value* val = (Value*) ptr;
-	/*debug("|");
-	if(ptr)
-		debug(ptr->title_);
-	//print(ptr->state);
-	debug("|");*/
-	
-	for(int i = 0; i<32; i++)
-		hal_draw(offset,i);
-	for(int i = 0; i<size; i++)
-		hal_draw(offset+i,31-i%32);
-	for(int i = 0; i<size; i++)
-		hal_draw(offset+i,31-(i+16)%32);
 
-	hal_print(offset+5 , 10, ptr->title_);
+	for(int i = 0; i<32; i++)
+		c.draw(0,i);
+	for(int i = 0; i<size; i++)
+		c.draw(i,31-i%32);
+	for(int i = 0; i<size; i++)
+		c.draw(i,31-(i+16)%32);
+
+	c.print(5 , 10, ptr->title_);
 	peng[0]=input[0]?' ':'#';
 	peng[1]=input[1]?' ':'#';
 	peng[2]=input[2]?' ':'#';
@@ -31,32 +25,21 @@ void draw_foo(int offset, int size, Node* ptr){
 	j++;
 	j%=26;
 	peng[4] = 'a'+j;
-	hal_print(offset+5 , 20, peng);
+	c.print(5 , 20, peng);
 }
 
-void draw_blub(int offset, int size, Node* ptr){
+void draw_blub(int offset, int size, Node* ptr, canvas& c){
 	Value* val = (Value*) ptr;
-	/*debug("#");
-	if(ptr)
-		debug(ptr->title_);
-	//print(ptr->state);
-	debug("#");*/
 	for(int i = 0; i<32;i++)
-		hal_draw(offset,i);
+		c.draw(0,i);
 
-	hal_print(offset+5 , 10, ptr->title_);
+	c.print(5 , 10, ptr->title_);
 }
 
-void draw_menu(int offset, int size, Node* val){
-	/*if(val&&val->title_){
-		debug("_");
-		debug(val->title_);
-		debug("_");
-		//print(ptr->state);
-	}*/
-		
+void draw_menu(int offset, int size, Node* val, canvas& c){
+
 	for(int i = 0; i<32;i++)
-		hal_draw(offset,i);
+		c.draw(0,i);
 	for(int i = 0; i<32 && i<size;i++)
-		hal_draw(offset+(i%size),i);
+		c.draw((i%size),i);
 }
diff --git a/src/gfx/buffer_1.cpp b/src/gfx/buffer_1.cpp
new file mode 100644
index 0000000..3e016ce
--- /dev/null
+++ b/src/gfx/buffer_1.cpp
@@ -0,0 +1,5 @@
+//
+// Created by jedi on 11/2/18.
+//
+
+#include "gfx/buffer_1.h"
diff --git a/src/gfx/buffer_32.cpp b/src/gfx/buffer_32.cpp
new file mode 100644
index 0000000..2ac949c
--- /dev/null
+++ b/src/gfx/buffer_32.cpp
@@ -0,0 +1,5 @@
+//
+// Created by jedi on 11/2/18.
+//
+
+#include "gfx/buffer_32.h"
diff --git a/src/gfx/canvas.cpp b/src/gfx/canvas.cpp
index 44f7a71..734898b 100644
--- a/src/gfx/canvas.cpp
+++ b/src/gfx/canvas.cpp
@@ -4,11 +4,18 @@
 
 #include "gfx/canvas.h"
 
-canvas::canvas(int w, int h) : width_(w), height_(h) {
+canvas::canvas(int w, int h) : width_(w), height_(h), buffer_(w*h) {
+    clear();
+}
+
+void canvas::clear() {
+    for (int x = 0; x < width_; x++)
+        for (int y = 0; y < height_; y++)
+            buffer_.set(x * height_ + y, false);
 }
 
 void canvas::draw(int x, int y) {
-    hal_draw(x, y);
+    buffer_.set(x * height_ + y, true);
 }
 
 void canvas::print(int x, int y, const char *str, font& f) {
diff --git a/src/main.cpp b/src/main.cpp
index 8b41a8d..1515cfb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -53,13 +53,15 @@ int main() {
 
 	//render
     hal_init();
-    //render(l);
+    render(l);
 
+    /*
     canvas c(64,32);
     char foo[] = "ABCDEFGHIJKLMOPQRSTUVWXYZ";
 	c.print(1,1,"HELLO");
 	c.print(1,7,"Foo Bar");
 	c.print(1,13,foo);
+     */
     //s.draw(0,0,c);
 
 #ifdef LINUX