diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.s b/soft/PjtKEIL_StepSon/Src/GestionSon.s
index 4a968a9..84e1d0d 100644
--- a/soft/PjtKEIL_StepSon/Src/GestionSon.s
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.s
@@ -13,7 +13,7 @@
 ;Section RAM (read write):
 	area    maram,data,readwrite
 		
-IndexSon	DCW 0
+IndexSon	DCW 5512
 SortieSon	DCW 0
 
 	EXPORT SortieSon
@@ -21,11 +21,21 @@ SortieSon	DCW 0
 ; ===============================================================================================
 	
 	EXPORT CallbackSon
+	EXPORT StartSon
 		
 ;Section ROM code (read only) :		
 	area    moncode,code,readonly
 ; écrire le code ici		
 
+StartSon proc
+	push {lr}
+	ldr r0, =IndexSon
+	mov r1, #0
+	str r1, [r0]
+	pop {lr}
+	bx lr
+	ENDP
+
 CallbackSon proc
 	push {lr}
 	ldr r0, =IndexSon 			; r0 = &IndexSon
@@ -35,9 +45,7 @@ CallbackSon proc
 	ldr r3, [r2]				; r3 = LongueurSon
 	
 	cmp r1, r3
-	blt NoReset
-	mov r1, #0					; si IndexSon >= LongueurSon alors IndexSon = 0
-NoReset
+	bge DoNothing
 	ldr r3, =Son				; r3 = &Son
 	ldrsh r2, [r3, r1, LSL#1]	; r2 = Son[IndexSon]
 	add r2, #0x8000				; translater de [-32768;32767] à [0;65535]
@@ -50,6 +58,7 @@ NoReset
 	strh r2, [r0]				; SortieSon = ce qu'on veut
 	mov r0, r2
 	bl PWM_Set_Value_TIM3_Ch3
+DoNothing
 	pop {lr}
 	bx lr
 	
diff --git a/soft/PjtKEIL_StepSon/Src/principal.c b/soft/PjtKEIL_StepSon/Src/principal.c
index 965367a..78d61c0 100644
--- a/soft/PjtKEIL_StepSon/Src/principal.c
+++ b/soft/PjtKEIL_StepSon/Src/principal.c
@@ -1,6 +1,7 @@
 #include "DriverJeuLaser.h"
 
 extern void CallbackSon(void);
+extern void StartSon(void);
 
 int main(void)
 {
@@ -16,10 +17,10 @@ PWM_Init_ff(TIM3, 3, 720); // f_PWM = 72MHz/720 = 100kHz
 Timer_1234_Init_ff(TIM4, 6552); // periode_son/f_CPU = (91*10^-6)*(72*10^6) = 6552
 Active_IT_Debordement_Timer(TIM4, 2, CallbackSon);
 
-//============================================================================	
-	
+//============================================================================
 while	(1)
 	{
+			StartSon();
 	}
 }
 
diff --git a/soft/PjtKEIL_StepSon/StepSon.uvoptx b/soft/PjtKEIL_StepSon/StepSon.uvoptx
index 4a88dcf..9c08782 100644
--- a/soft/PjtKEIL_StepSon/StepSon.uvoptx
+++ b/soft/PjtKEIL_StepSon/StepSon.uvoptx
@@ -215,7 +215,7 @@
         <Wi>
           <IntNumber>0</IntNumber>
           <FirstString>`SortieSon</FirstString>
-          <SecondString>008000000000000000000000000000905D78864100000000000000000000000000000000536F72746965536F6E00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004100000001000000000000000000E03F170000000000000000000000000000000000000094080008</SecondString>
+          <SecondString>0080000000000010572172410000005058E17A4100000000000000000000000000000000536F72746965536F6E00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004100000001000000000000000000E03F170000000000000000000000000000000000000094080008</SecondString>
         </Wi>
         <Wi>
           <IntNumber>1</IntNumber>