diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.h b/soft/PjtKEIL_StepSon/Src/GestionSon.h
index e69de29..c5593ba 100644
--- a/soft/PjtKEIL_StepSon/Src/GestionSon.h
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.h
@@ -0,0 +1,3 @@
+void callback_son(void);
+
+void start_son(void); 
\ No newline at end of file
diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.s b/soft/PjtKEIL_StepSon/Src/GestionSon.s
index a2d0f10..828dd2e 100644
--- a/soft/PjtKEIL_StepSon/Src/GestionSon.s
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.s
@@ -3,8 +3,9 @@
 		
 	include	Driver/DriverJeuLaser.inc
 	export callback_son;
+	export start_son;
 	export sortieSon;
-	extern Son;	
+	extern Son;
 ; ====================== zone de réservation de données,  ======================================
 ;Section RAM (read only) :
 	area    mesdata,data,readonly
@@ -25,9 +26,12 @@ index dcd 0
 ; écrire le code ici		
 
 callback_son
-	push{lr,r4};
+	push{lr,r4,r5};
 	ldr r0, =index;
 	ldr r4, [r0];
+	mov r5, #5512;
+	cmp r4,r5;
+	bgt fin;
 	ldr r1, =sortieSon;
 	ldr r2, =Son;
 	ldrsh r3, [r2, r4,lsl #1];
@@ -40,12 +44,13 @@ callback_son
 	str r3, [r1];
 	mov r0,r3;
 	bl PWM_Set_Value_TIM3_Ch3;
-	pop{pc,r4};
-	END	
+fin
+	pop{pc,r4,r5};
 		
-StartSon
+start_son
 	push{lr};
-	
-	
+	ldr r0, =index;
+	mov r1, #0;
+	str r1, [r0];
 	pop{pc};
 	END
\ No newline at end of file
diff --git a/soft/PjtKEIL_StepSon/Src/principal.c b/soft/PjtKEIL_StepSon/Src/principal.c
index 9be4734..dfbd742 100644
--- a/soft/PjtKEIL_StepSon/Src/principal.c
+++ b/soft/PjtKEIL_StepSon/Src/principal.c
@@ -1,7 +1,8 @@
 
 #include "DriverJeuLaser.h"
-extern void callback_son(void); 
-
+extern void callback_son(void);
+extern void start_son(void); 
+int button = 0;
 int main(void)
 {
 
@@ -20,7 +21,11 @@ GPIO_Configure(GPIOB, 0, OUTPUT, ALT_PPULL);
 	
 while	(1)
 	{
-
+	 if (button == 1){
+		 start_son();
+		 button = 0;
+	 }
 	}
+	
 }
 
diff --git a/soft/PjtKEIL_StepSon/StepSon.uvoptx b/soft/PjtKEIL_StepSon/StepSon.uvoptx
index d844344..30ee7a5 100644
--- a/soft/PjtKEIL_StepSon/StepSon.uvoptx
+++ b/soft/PjtKEIL_StepSon/StepSon.uvoptx
@@ -75,7 +75,7 @@
       <OPTFL>
         <tvExp>1</tvExp>
         <tvExpOptDlg>0</tvExpOptDlg>
-        <IsCurrentTarget>0</IsCurrentTarget>
+        <IsCurrentTarget>1</IsCurrentTarget>
       </OPTFL>
       <CpuCode>18</CpuCode>
       <DebugOpt>
@@ -168,7 +168,7 @@
       <DebugFlag>
         <trace>0</trace>
         <periodic>1</periodic>
-        <aLwin>1</aLwin>
+        <aLwin>0</aLwin>
         <aCover>0</aCover>
         <aSer1>0</aSer1>
         <aSer2>0</aSer2>
@@ -182,7 +182,7 @@
         <AscS3>0</AscS3>
         <aSer3>0</aSer3>
         <eProf>0</eProf>
-        <aLa>1</aLa>
+        <aLa>0</aLa>
         <aPa1>0</aPa1>
         <AscS4>0</AscS4>
         <aSer4>0</aSer4>
@@ -280,7 +280,7 @@
       <OPTFL>
         <tvExp>1</tvExp>
         <tvExpOptDlg>0</tvExpOptDlg>
-        <IsCurrentTarget>1</IsCurrentTarget>
+        <IsCurrentTarget>0</IsCurrentTarget>
       </OPTFL>
       <CpuCode>18</CpuCode>
       <DebugOpt>