diff --git a/soft/PjtKEIL_StepDeb_2/Src/Cligno.s b/soft/PjtKEIL_StepDeb_2/Src/Cligno.s
index 8c80eb5..25e91e4 100644
--- a/soft/PjtKEIL_StepDeb_2/Src/Cligno.s
+++ b/soft/PjtKEIL_StepDeb_2/Src/Cligno.s
@@ -30,7 +30,7 @@
 ;Section RAM (read write):
 	area    maram,data,readwrite
 FlagCligno dcd	0	
-
+index dcd 0
 	
 ; ===============================================================================================
 	
diff --git a/soft/PjtKEIL_StepSon/Src/GestionSon.s b/soft/PjtKEIL_StepSon/Src/GestionSon.s
index 8a75b7a..17ae42e 100644
--- a/soft/PjtKEIL_StepSon/Src/GestionSon.s
+++ b/soft/PjtKEIL_StepSon/Src/GestionSon.s
@@ -1,6 +1,11 @@
 	PRESERVE8
 	THUMB   
-		
+	
+	export CallbackSon
+	export index
+	export SortieSon
+	import LongueurSon
+	import Son
 
 ; ====================== zone de réservation de données,  ======================================
 ;Section RAM (read only) :
@@ -9,7 +14,8 @@
 
 ;Section RAM (read write):
 	area    maram,data,readwrite
-		
+SortieSon dcw 0
+index dcd 0		
 
 	
 ; ===============================================================================================
@@ -19,12 +25,42 @@
 		
 ;Section ROM code (read only) :		
 	area    moncode,code,readonly
-; écrire le code ici		
+; écrire le code ici	
+
+CallbackSon proc	
+	push {r4,lr,r5,r6,r7}
+	ldr r4,=LongueurSon
+	ldr r4,[r4]
+	ldr r2,=index
+	ldr r7,[r2]
+	cmp r4,r7
+	
+	bne alors
+	
+sinon
+	b finsi
+
+alors
+	ldr r3,=SortieSon
+	ldr r1,=Son
+	
+	ldrsh r0,[r1,r2,lsl#1]  ; R0 = *(R1+2*R2 )    R0  = R1[R2]
+	
+	mov r5,#719
+	mul r3,r5
+	asr r3,#16
+	
+	ldr r6,=23560192 ;719*32768
+	add r3,r6
+	asr r3,#16
+	
+	add r7,#1 ;index=index+1
+	str r7,[r2] ; *R2 = R7
 
 
-
-
-
-		
+finsi
+	pop {r4,lr,r5,r6,r7}
+	bx lr	
+	endp
 		
 	END	
\ No newline at end of file
diff --git a/soft/PjtKEIL_StepSon/Src/principal.c b/soft/PjtKEIL_StepSon/Src/principal.c
index 7e1db07..41da6a4 100644
--- a/soft/PjtKEIL_StepSon/Src/principal.c
+++ b/soft/PjtKEIL_StepSon/Src/principal.c
@@ -2,7 +2,9 @@
 
 #include "DriverJeuLaser.h"
 
-extern u32 * PeriodeSonMicroSec;
+//extern u32 * PeriodeSonMicroSec;
+
+extern void CallbackSon(void);
 
 int main(void)
 {
@@ -14,7 +16,8 @@ int main(void)
 // Après exécution : le coeur CPU est clocké à 72MHz ainsi que tous les timers
 CLOCK_Configure();
 
-Timer_1234_Init_ff( TIM4,*PeriodeSonMicroSec); 	
+Timer_1234_Init_ff( TIM4, 1000000/11025); //Calcul de la periode de 91 microsec
+Active_IT_Debordement_Timer( TIM4, 2, CallbackSon );
 	
 	
 
@@ -26,3 +29,15 @@ while	(1)
 	}
 }
 
+/*
+short int SortieSon
+int index
+Algo CallbackSon
+if index<longueur
+on stocke son[index] dans r0
+mise a l'echelle
+sortieson=a*son[index]+b
+index ++
+}
+
+*/
diff --git a/soft/PjtKEIL_StepSon/StepSon.uvoptx b/soft/PjtKEIL_StepSon/StepSon.uvoptx
index ff2c5d5..247b209 100644
--- a/soft/PjtKEIL_StepSon/StepSon.uvoptx
+++ b/soft/PjtKEIL_StepSon/StepSon.uvoptx
@@ -153,7 +153,32 @@
           <Name>-U066CFF574857847167074929 -O2254 -S0 -C0 -A0 -N00("ARM CoreSight SW-DP") -D00(1BA01477) -L00(0) -TO18 -TC10000000 -TP21 -TDS8007 -TDT0 -TDC1F -TIEFFFFFFFF -TIP8 -FO7 -FD20000000 -FC800 -FN1 -FF0STM32F10x_128.FLM -FS08000000 -FL020000 -FP0($$Device:STM32F103RB$Flash\STM32F10x_128.FLM)</Name>
         </SetRegEntry>
       </TargetDriverDllRegistry>
-      <Breakpoint/>
+      <Breakpoint>
+        <Bp>
+          <Number>0</Number>
+          <Type>0</Type>
+          <LineNumber>31</LineNumber>
+          <EnabledFlag>1</EnabledFlag>
+          <Address>134219960</Address>
+          <ByteObject>0</ByteObject>
+          <HtxType>0</HtxType>
+          <ManyObjects>0</ManyObjects>
+          <SizeOfObject>0</SizeOfObject>
+          <BreakByAccess>0</BreakByAccess>
+          <BreakIfRCount>1</BreakIfRCount>
+          <Filename>.\Src\GestionSon.s</Filename>
+          <ExecCommand></ExecCommand>
+          <Expression>\\StepSon\Src/GestionSon.s\31</Expression>
+        </Bp>
+      </Breakpoint>
+      <MemoryWindow1>
+        <Mm>
+          <WinNumber>1</WinNumber>
+          <SubType>0</SubType>
+          <ItemText>R2</ItemText>
+          <AccSizeX>0</AccSizeX>
+        </Mm>
+      </MemoryWindow1>
       <Tracepoint>
         <THDelay>0</THDelay>
       </Tracepoint>
@@ -174,7 +199,7 @@
         <AscS3>0</AscS3>
         <aSer3>0</aSer3>
         <eProf>0</eProf>
-        <aLa>0</aLa>
+        <aLa>1</aLa>
         <aPa1>0</aPa1>
         <AscS4>0</AscS4>
         <aSer4>0</aSer4>
@@ -200,7 +225,12 @@
         <Wi>
           <IntNumber>0</IntNumber>
           <FirstString>((portb &amp; 0x00000002) &gt;&gt; 1 &amp; 0x2) &gt;&gt; 1</FirstString>
-          <SecondString>FF000000000000000000000000000000E0FFEF400100000000000000000000000000000028706F7274622026203078303030303030303229203E3E2031000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000001000000000000000000F03F160000000000000000000000000000000000000096020008</SecondString>
+          <SecondString>FF000000000000000000000000000000E0FFEF400100000000000000000000000000000028706F7274622026203078303030303030303229203E3E2031000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000001000000000000000000E03F100000000000000000000000000000000000000096020008</SecondString>
+        </Wi>
+        <Wi>
+          <IntNumber>1</IntNumber>
+          <FirstString>`SortieSon</FirstString>
+          <SecondString>0080000000000000000000000000E0FFFFFFEF4100000000000000000000000000000000536F72746965536F6E00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000002000000000000000000E03F100000000000000000000000000000000000000094080008</SecondString>
         </Wi>
       </LogicAnalyzers>
       <DebugDescription>