diff --git a/Makefile b/Makefile
index 30884d1..09f9dfa 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ CFLAGS=-Wall -mmcu=$(MCU) -std=gnu99 -I $(TOOLCHAIN_PREFIX)/include -O3 -g0
 
 LDFLAGS=-mmcu=$(MCU) -L $(TOOLCHAIN_PREFIX)/include
 
-$(ARTIFACT).elf:	main.o led.o time.o PontCoopScheduler.o displayDriver.o canvas.o displayTest.o displayTest2.o displayTest3.o displayTest4.o
+$(ARTIFACT).elf:	main.o led.o time.o PontCoopScheduler.o displayDriver.o canvas.o displayTest.o displayTest2.o displayTest3.o
 	$(CC) -o $@ $(LDFLAGS) $^
 	$(OBJDUMP) -D $(ARTIFACT).elf > $(ARTIFACT).txt
 
diff --git a/PontCoopScheduler.h b/PontCoopScheduler.h
index 1ab47c1..b47ef04 100644
--- a/PontCoopScheduler.h
+++ b/PontCoopScheduler.h
@@ -13,7 +13,7 @@
 
 
 
-#define MAX_NUM_OF_TASKS 4
+#define MAX_NUM_OF_TASKS 2
 
 
 typedef struct {
diff --git a/canvas.c b/canvas.c
index 5835465..32d9825 100644
--- a/canvas.c
+++ b/canvas.c
@@ -20,6 +20,14 @@ void canvasInit() {
   displayDriverTransferCanvas();
 }
 
+void canvasClear() {
+  memset(canvas.canvas, 0x80, canvas.size);
+}
+
+void canvasSetAll(uint8_t color) {
+  memset(canvas.canvas, color + 0x80, canvas.size);
+}
+
 canvas_t *canvasGet() {
   return &canvas;
 }
diff --git a/canvas.h b/canvas.h
index 0ebef3b..92b2f38 100644
--- a/canvas.h
+++ b/canvas.h
@@ -15,6 +15,8 @@ typedef struct {
 } canvas_t;
 
 void canvasInit();
+void canvasClear();
+void canvasSetAll(uint8_t color);
 canvas_t *canvasGet();
 void canvasShow();
 void canvasSetPixel(uint8_t column, uint8_t row, uint8_t color);
diff --git a/led.c b/led.c
index 2c28ac3..5cfc7d3 100644
--- a/led.c
+++ b/led.c
@@ -12,6 +12,10 @@ void ledGreenOff() {
   P1OUT &= ~BIT0;
 }
 
+void ledGreenToggle() {
+  P1OUT ^= BIT0;
+}
+
 void ledBlueOn() {
   P1OUT |= BIT1;
 }
@@ -20,6 +24,10 @@ void ledBlueOff() {
   P1OUT &= ~BIT1;
 }
 
+void ledBlueToggle() {
+  P1OUT ^= BIT1;
+}
+
 void ledExec(void *args) {
   static uint16_t i = 0;
 
@@ -41,7 +49,7 @@ void ledInit() {
     ledBlueOff();
 
 
-    schAdd(ledExec, NULL, 0, 500);
+//    schAdd(ledExec, NULL, 0, 500);
 }
 
 
diff --git a/led.h b/led.h
index 3c7a8e0..207797e 100644
--- a/led.h
+++ b/led.h
@@ -4,8 +4,10 @@
 
 void ledBlueOff();
 void ledBlueOn();
+void ledBlueToggle();
 void ledGreenOff();
 void ledGreenOn();
+void ledGreenToggle();
 
 void ledInit();
 void ledExec();
diff --git a/main.c b/main.c
index 2bca538..2aa0f8b 100644
--- a/main.c
+++ b/main.c
@@ -11,7 +11,6 @@
 #include "displayTest.h"
 #include "displayTest2.h"
 #include "displayTest3.h"
-#include "displayTest4.h"
 
 
 int main() {