diff --git a/elec/spice/pwm/PWM.net b/elec/spice/pwm/PWM.net
new file mode 100644
index 0000000..b7769d7
--- /dev/null
+++ b/elec/spice/pwm/PWM.net
@@ -0,0 +1,16 @@
+* U:\Bureau\grpD_Lanard_ElKhatiri\elec\spice\pwm\PWM.asc
+V1 Compteur 0 PULSE(0 3.3 0 5u 0 0 5u)
+C1 Filtre 0 10n
+R1 Filtre PWM 3.9k
+V2 CompValue 0 SINE(1.65 1 2k)
+B1 PWM 0 V=if(V(CompValue)>V(Compteur),3.3,0)
+;ac dec 100 1 10meg
+.tran 0 1.5m 0 0.01u
+* Compteur de l'unité Timer
+* Partie PWM de l'unité Timer
+* TIMER3
+* PB0
+* Chanel 3
+* STM32F103
+.backanno
+.end
diff --git a/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/GestionSon.s b/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/GestionSon.s
index bec8416..4977af3 100644
--- a/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/GestionSon.s
+++ b/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/GestionSon.s
@@ -16,13 +16,14 @@
 	
 ; ===============================================================================================
 	
+		include DriverJeuLaser.lib
 		export CallbackSon
 		export SortieSon
 		extern LongueurSon
 		extern Son
 
-Index	DCW  0
-SortieSon DCD 0
+Index	DCD  0
+SortieSon DCW 0
 		
 ;Section ROM code (read only) :		
 	area    moncode,code,readonly
@@ -31,6 +32,8 @@ SortieSon DCD 0
 
 CallbackSon proc
 	
+	
+	
 	ldr r0,=Index
 	ldr r1,[r0]
 	ldr r2,=Son
@@ -56,14 +59,15 @@ notEqual
 	ldr r6,=SortieSon
 	
 	strh r5,[r6]
-	add r1, #1
 	
-	str r0,[r4]
+	add r1, #2
+	
+	str r1,[r0]
 	pop{r6}
 	pop {r4}
 	pop {r5}
-	bx lr 
 	
+	bx lr
 	 
 	
 	
diff --git a/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/principal.c b/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/principal.c
index 4944ddd..af42510 100644
--- a/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/principal.c
+++ b/soft/PjtKEIL_StepSon/PjtKEIL_StepSon/Src/principal.c
@@ -14,10 +14,11 @@ int main(void)
 // Après exécution : le coeur CPU est clocké à 72MHz ainsi que tous les timers
 CLOCK_Configure();
 
-Timer_1234_Init_ff( TIM4, 91);
-	
+Timer_1234_Init_ff( TIM4, 6552);
+Timer_1234_Init_ff( TIM3,720);
 Active_IT_Debordement_Timer( TIM4, 2, CallbackSon);
-
+GPIO_Configure(GPIOB, 0, OUTPUT, ALT_PPULL);
+PWM_Init_ff( TIM3, 3, 720);
 //============================================================================