diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.h b/soft/PjtKEIL_StepSon/Src/GestionSon.h
new file mode 100644
index 0000000..f3f0065
--- /dev/null
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.h
@@ -0,0 +1,2 @@
+extern short SortieSon;
+extern void StartSon();
\ No newline at end of file
diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.s b/soft/PjtKEIL_StepSon/Src/GestionSon.s
index 012fa80..8b200c3 100644
--- a/soft/PjtKEIL_StepSon/Src/GestionSon.s
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.s
@@ -17,6 +17,7 @@ indexTab dcd 0
 	
 ; ===============================================================================================
 	EXPORT CallbackSon;
+	EXPORT StartSon;
 	EXPORT SortieSon;
 	EXTERN LongueurSon;
 	EXTERN Son;
@@ -29,6 +30,14 @@ indexTab dcd 0
 	area    moncode,code,readonly
 ; écrire le code ici		
 
+StartSon proc
+
+	LDR r0,=indexTab
+	MOV r1,#0
+	STR r1,[r0]
+	BX LR
+	endp
+
 CallbackSon proc
 	LDR r0,=SortieSon
 	LDR r1,=Son
@@ -71,7 +80,7 @@ CallbackSon proc
 	BX lr
 	
 Fin
-	MOV r2,#0
+	MOV r2,#-1
 	STR r2,[r0]
 	
 	pop {r8}
diff --git a/soft/PjtKEIL_StepSon/Src/principal.c b/soft/PjtKEIL_StepSon/Src/principal.c
index e86dc30..f22d0f8 100644
--- a/soft/PjtKEIL_StepSon/Src/principal.c
+++ b/soft/PjtKEIL_StepSon/Src/principal.c
@@ -1,6 +1,9 @@
 
 
 #include "DriverJeuLaser.h"
+#include "GestionSon.h"
+
+
 void CallbackSon(void);
 
 
@@ -22,6 +25,10 @@ GPIO_Configure(GPIOB, 0, OUTPUT, ALT_PPULL);
 	
 while	(1)
 	{
+		if(SortieSon==-1)
+		{
+			StartSon();
+		}
 	}
 }
 
diff --git a/soft/PjtKEIL_StepSon/StepSon.uvoptx b/soft/PjtKEIL_StepSon/StepSon.uvoptx
index fb2a3ed..59b47cf 100644
--- a/soft/PjtKEIL_StepSon/StepSon.uvoptx
+++ b/soft/PjtKEIL_StepSon/StepSon.uvoptx
@@ -753,6 +753,18 @@
       <RteFlg>0</RteFlg>
       <bShared>0</bShared>
     </File>
+    <File>
+      <GroupNumber>4</GroupNumber>
+      <FileNumber>6</FileNumber>
+      <FileType>5</FileType>
+      <tvExp>0</tvExp>
+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>.\Src\GestionSon.h</PathWithFileName>
+      <FilenameWithoutPath>GestionSon.h</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
   </Group>
 
   <Group>
diff --git a/soft/PjtKEIL_StepSon/StepSon.uvprojx b/soft/PjtKEIL_StepSon/StepSon.uvprojx
index 2849fe6..33e8a1e 100644
--- a/soft/PjtKEIL_StepSon/StepSon.uvprojx
+++ b/soft/PjtKEIL_StepSon/StepSon.uvprojx
@@ -423,6 +423,11 @@
               <FileType>2</FileType>
               <FilePath>.\Src\GestionSon.s</FilePath>
             </File>
+            <File>
+              <FileName>GestionSon.h</FileName>
+              <FileType>5</FileType>
+              <FilePath>.\Src\GestionSon.h</FilePath>
+            </File>
           </Files>
         </Group>
         <Group>
@@ -434,7 +439,7 @@
       <TargetName>CibleSondeKEIL</TargetName>
       <ToolsetNumber>0x4</ToolsetNumber>
       <ToolsetName>ARM-ADS</ToolsetName>
-      <pCCUsed>5060750::V5.06 update 6 (build 750)::.\ARMCC</pCCUsed>
+      <pCCUsed>5060960::V5.06 update 7 (build 960)::.\ARMCC</pCCUsed>
       <uAC6>0</uAC6>
       <TargetOption>
         <TargetCommonOption>
@@ -847,6 +852,11 @@
               <FileType>2</FileType>
               <FilePath>.\Src\GestionSon.s</FilePath>
             </File>
+            <File>
+              <FileName>GestionSon.h</FileName>
+              <FileType>5</FileType>
+              <FilePath>.\Src\GestionSon.h</FilePath>
+            </File>
           </Files>
         </Group>
         <Group>
@@ -1340,6 +1350,11 @@
               <FileType>2</FileType>
               <FilePath>.\Src\GestionSon.s</FilePath>
             </File>
+            <File>
+              <FileName>GestionSon.h</FileName>
+              <FileType>5</FileType>
+              <FilePath>.\Src\GestionSon.h</FilePath>
+            </File>
           </Files>
         </Group>
         <Group>