diff --git a/include/timer.h b/include/timer.h
index 1ac7d5c..2a5b7c9 100644
--- a/include/timer.h
+++ b/include/timer.h
@@ -1,6 +1,11 @@
 #ifndef TIMER_H
 #define TIMER_H
+#define DELTA 1000000L
 
-void start_timer(void);
+void update_timer(unsigned long int start);
+
+unsigned long int start_timer(unsigned long int start);
+
+unsigned long int stop_timer(unsigned long int start);
 
 #endif
\ No newline at end of file
diff --git a/src/timer.c b/src/timer.c
index 8125b2c..10449e3 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -1,24 +1,33 @@
 #include<stdio.h>
 #include<stdlib.h>
 #include<graph.h>
-#define delta 1000000L
-
-void start_timer(void) {
-	unsigned long int start = Microsecondes();
-	unsigned int minute = 0;
-	unsigned int a = 0;
+#define DELTA 1000000L
 
+void update_timer(unsigned long int start) {
+	unsigned int secondes = ((Microsecondes() - start) / DELTA);
+	unsigned int minutes = 0;
 	char buf[100];
-	while(1){				
-		unsigned long int seconde = ((Microsecondes() - start) / 1000000)-a;
 		
-		if (seconde>=60) {
-			minute +=1;
-			a += 60;
-		}
-
-		snprintf(buf, 100, "temps : %02d:%02d", minute, seconde);
-		
-		EcrireTexte(20,20, buf, 1);			
+	while (secondes >= 60) {
+		minutes += 1;
+		secondes -= 60;
 	}
+
+	ChoisirEcran(3);
+	EffacerEcran(CouleurParComposante(54, 57, 63));
+	ChoisirCouleurDessin(CouleurParNom("white"));
+	snprintf(buf, 100, "Temps : %02d:%02d", minutes, secondes);
+	EcrireTexte(20, 20, buf, 1);
+	CopierZone(3, 0, 0, 0, 150, 30, 0, 0);
+	ChoisirEcran(0);
+}
+
+unsigned long int start_timer(unsigned long int start) {
+	start = Microsecondes() - start;
+	update_timer(start);
+	return start;
+}
+
+unsigned long int stop_timer(unsigned long int start) {
+	return Microsecondes()-start;
 }
\ No newline at end of file