diff --git a/soft/PjtKEIL_StepDeb_2/Src/Cligno.s b/soft/PjtKEIL_StepDeb_2/Src/Cligno.s
index 8a75b7a..6429495 100644
--- a/soft/PjtKEIL_StepDeb_2/Src/Cligno.s
+++ b/soft/PjtKEIL_StepDeb_2/Src/Cligno.s
@@ -6,25 +6,43 @@
 ;Section RAM (read only) :
 	area    mesdata,data,readonly
 
+	IMPORT GPIOC_Set
+	IMPORT GPIOC_Clear
 
 ;Section RAM (read write):
 	area    maram,data,readwrite
 		
-
+FlagCligno	DCW 0
 	
 ; ===============================================================================================
 	
-
+	EXPORT timer_callback
 
 		
 ;Section ROM code (read only) :		
 	area    moncode,code,readonly
 ; écrire le code ici		
 
-
-
-
-
+timer_callback proc
+	push {lr}
+	mov r0, #12
+	ldr r2, =FlagCligno
+	ldr r1, [r2]
+	cmp r1, #1
+	bne Reset
+	mov r1, #0
+	str r1, [r2]
+	bl GPIOC_Set
+	pop {lr}
+	bx lr
+Reset
+	mov r1, #1
+	str r1, [r2]
+	bl GPIOC_Clear
+	pop {lr}
+	bx lr
+	
+	ENDP
 		
-		
-	END	
\ No newline at end of file
+ END
+	
\ No newline at end of file
diff --git a/soft/PjtKEIL_StepDeb_2/Src/principal.c b/soft/PjtKEIL_StepDeb_2/Src/principal.c
index 7307daf..1869ee6 100644
--- a/soft/PjtKEIL_StepDeb_2/Src/principal.c
+++ b/soft/PjtKEIL_StepDeb_2/Src/principal.c
@@ -42,21 +42,3 @@ while	(1)
 	{
 	}
 }
-
-char FlagCligno;
-
-void timer_callback(void)
-{
-	if (FlagCligno==1)
-	{
-		FlagCligno=0;
-		GPIOC_Set(12);
-	}
-	else
-	{
-		FlagCligno=1;
-		GPIOC_Clear(12);
-	}
-		
-}
-
diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.s b/soft/PjtKEIL_StepSon/Src/GestionSon.s
index 8494b7d..4a968a9 100644
--- a/soft/PjtKEIL_StepSon/Src/GestionSon.s
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.s
@@ -6,6 +6,7 @@
 ;Section RAM (read only) :
 	area    mesdata,data,readonly
 
+	IMPORT PWM_Set_Value_TIM3_Ch3
 	IMPORT LongueurSon
 	IMPORT Son
 		
@@ -26,6 +27,7 @@ SortieSon	DCW 0
 ; écrire le code ici		
 
 CallbackSon proc
+	push {lr}
 	ldr r0, =IndexSon 			; r0 = &IndexSon
 	ldrh r1, [r0] 				; r1 = IndexSon
 	
@@ -46,6 +48,9 @@ NoReset
 	str r1, [r0] 				; IndexSon++;
 	ldr r0, =SortieSon			; r0 = &SortieSon
 	strh r2, [r0]				; SortieSon = ce qu'on veut
+	mov r0, r2
+	bl PWM_Set_Value_TIM3_Ch3
+	pop {lr}
 	bx lr
 	
 	ENDP
diff --git a/soft/PjtKEIL_StepSon/Src/principal.c b/soft/PjtKEIL_StepSon/Src/principal.c
index 2dd039c..965367a 100644
--- a/soft/PjtKEIL_StepSon/Src/principal.c
+++ b/soft/PjtKEIL_StepSon/Src/principal.c
@@ -12,9 +12,10 @@ int main(void)
 // Après exécution : le coeur CPU est clocké à 72MHz ainsi que tous les timers
 CLOCK_Configure();
 GPIO_Configure(GPIOB, 0, OUTPUT, ALT_PPULL);
-PWM_Init_ff(TIM3, 3, 720);
-Timer_1234_Init_ff(TIM4, 6552); // (91*10^-6)*(72*10^6) = 6552
+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)
diff --git a/soft/PjtKEIL_StepSon/StepSon.uvoptx b/soft/PjtKEIL_StepSon/StepSon.uvoptx
index d8c97ae..4a88dcf 100644
--- a/soft/PjtKEIL_StepSon/StepSon.uvoptx
+++ b/soft/PjtKEIL_StepSon/StepSon.uvoptx
@@ -215,7 +215,12 @@
         <Wi>
           <IntNumber>0</IntNumber>
           <FirstString>`SortieSon</FirstString>
-          <SecondString>008000000000000000000000000000905D78864100000000000000000000000000000000536F72746965536F6E00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004100000001000000000000000000F03F0D0000000000000000000000000000000000000094080008</SecondString>
+          <SecondString>008000000000000000000000000000905D78864100000000000000000000000000000000536F72746965536F6E00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004100000001000000000000000000E03F170000000000000000000000000000000000000094080008</SecondString>
+        </Wi>
+        <Wi>
+          <IntNumber>1</IntNumber>
+          <FirstString>((portb &amp; 0x00000001) &amp; 0x11111111) &gt;&gt; 0</FirstString>
+          <SecondString>00800000000000000000000000000000E0FFEF400100000000000000000000000000000028706F72746220262030783030303030303031290000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000002000000000000000000E03F1700000000000000000000000000000000000000540A0008</SecondString>
         </Wi>
       </LogicAnalyzers>
       <DebugDescription>