diff --git a/challenge/Project.uvoptx b/challenge/Project.uvoptx
index 329a5b8..3b9b422 100644
--- a/challenge/Project.uvoptx
+++ b/challenge/Project.uvoptx
@@ -157,38 +157,6 @@
         <Bp>
           <Number>0</Number>
           <Type>0</Type>
-          <LineNumber>38</LineNumber>
-          <EnabledFlag>1</EnabledFlag>
-          <Address>134218234</Address>
-          <ByteObject>0</ByteObject>
-          <HtxType>0</HtxType>
-          <ManyObjects>0</ManyObjects>
-          <SizeOfObject>0</SizeOfObject>
-          <BreakByAccess>0</BreakByAccess>
-          <BreakIfRCount>1</BreakIfRCount>
-          <Filename>.\Src\calcul_dft.s</Filename>
-          <ExecCommand></ExecCommand>
-          <Expression>\\CHTI\Src/calcul_dft.s\38</Expression>
-        </Bp>
-        <Bp>
-          <Number>1</Number>
-          <Type>0</Type>
-          <LineNumber>0</LineNumber>
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-          <SizeOfObject>0</SizeOfObject>
-          <BreakByAccess>0</BreakByAccess>
-          <BreakIfRCount>1</BreakIfRCount>
-          <Filename></Filename>
-          <ExecCommand></ExecCommand>
-          <Expression>0x08000198</Expression>
-        </Bp>
-        <Bp>
-          <Number>2</Number>
-          <Type>0</Type>
           <LineNumber>10</LineNumber>
           <EnabledFlag>1</EnabledFlag>
           <Address>134218152</Address>
@@ -202,6 +170,38 @@
           <ExecCommand></ExecCommand>
           <Expression>\\CHTI\Src/principal.c\10</Expression>
         </Bp>
+        <Bp>
+          <Number>1</Number>
+          <Type>0</Type>
+          <LineNumber>7</LineNumber>
+          <EnabledFlag>1</EnabledFlag>
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+          <ManyObjects>0</ManyObjects>
+          <SizeOfObject>0</SizeOfObject>
+          <BreakByAccess>0</BreakByAccess>
+          <BreakIfRCount>1</BreakIfRCount>
+          <Filename>.\Src\principal.c</Filename>
+          <ExecCommand></ExecCommand>
+          <Expression>\\CHTI\Src/principal.c\7</Expression>
+        </Bp>
+        <Bp>
+          <Number>2</Number>
+          <Type>0</Type>
+          <LineNumber>52</LineNumber>
+          <EnabledFlag>1</EnabledFlag>
+          <Address>134218270</Address>
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+          <BreakByAccess>0</BreakByAccess>
+          <BreakIfRCount>1</BreakIfRCount>
+          <Filename>.\Src\calcul_dft.s</Filename>
+          <ExecCommand></ExecCommand>
+          <Expression>\\CHTI\Src/calcul_dft.s\52</Expression>
+        </Bp>
         <Bp>
           <Number>3</Number>
           <Type>0</Type>
diff --git a/challenge/Src/calcul_dft.s b/challenge/Src/calcul_dft.s
index f0ae408..e65231c 100644
--- a/challenge/Src/calcul_dft.s
+++ b/challenge/Src/calcul_dft.s
@@ -4,34 +4,48 @@
 N	equ 64
 	
 	; vitesse initiale : 1726
-	; vitesse actuelle : 1119
+	; vitesse actuelle : 1101
 dft	proc
 	; r0 = x (signal), r1 = k
 	push {r4, r5, r6, r7, r8, r9}
 	ldr r2, =TabCos
 	ldr r3, =TabSin
 		
-	mov r4, #0	; r4 = i
 	mov r5, #0	; r5 = ik
-	mov r9, #0	; r9  = résultat réel
-	mov r12, #0	; r10 = résultat imaginaire
+	
+	; première itération de la boucle
+	ldrh r6, [r0], #2  ; r6 = x[i] (puis mise à jour de r0) | format 4.12
+	mov r7, #32767 ; r7 = cos [ik%N] | format 1.15
+	mov r8, #0 	   ; r8 = sin [ik%N] | format 1.15
+	mul r9, r6, r7	   ; r9 = x[i] * cos[ik%n]  |  format 5.27
+	mul r12, r6, r8	   ; r12 = x[i] * sin[ik%n]  |  format 5.27
+	
+	add r5, r1	; r5 = (i-1)k + k
+	and r5, #N-1 ; r5 = r5 % 64
+	mov r4, #1	; r4 = i = 1
 
-deb_somme	ldrh r6, [r0, r4, LSL #1]  ; r6 = x[i], LSL #1 pour faire ×2 car chaque valeur est sur 2 octets | format 4.12
+deb_somme	ldrh r6, [r0], #2  ; r6 = x[i] (puis mise à jour de r0) | format 4.12
 	ldrsh r7, [r2, r5, LSL #1] ; r7 = cos [ik%N] | format 1.15
 	ldrsh r8, [r3, r5, LSL #1] ; r8 = sin [ik%N] | format 1.15
 	mla r9, r6, r7, r9	   ; r9 += x[i] * cos[ik%n]  |  format 5.27
-	mla r12, r6, r8, r12	   ; r10 += x[i] * sin[ik%n]  |  format 5.27
+	mla r12, r6, r8, r12	   ; r12 += x[i] * sin[ik%n]  |  format 5.27
 	
 	add r5, r1	; r5 = (i-1)k + k
 	and r5, #N-1 ; r5 = r5 % 64
 	add r4, #1	; on incrémente i
-	cmp r4, #N	;
+	cmp r4, #N-1	
 	bne deb_somme
+	
+	; dernière itération de la boucle (pour éviter les 4 instructions inutiles à la fin)
+	ldrh r6, [r0]  ; r6 = x[i] | format 4.12
+	ldrsh r7, [r2, r5, LSL #1] ; r7 = cos [ik%N] | format 1.15
+	ldrsh r8, [r3, r5, LSL #1] ; r8 = sin [ik%N] | format 1.15
+	mla r9, r6, r7, r9	   ; r9 += x[i] * cos[ik%n]  |  format 5.27
+	mla r12, r6, r8, r12	   ; r10 += x[i] * sin[ik%n]  |  format 5.27
 		
 	; etat des registres : r0 = x, r1 = k, r9 = Re, r10 = Im, autres libres
 		
 	smull r2, r0, r9, r9	; (r2,r0) = Re(k)² | format : 10.54
-	
 	smlal r2, r0, r12, r12	; (r2,r0) = Re(k)² + Im(k)² | format : 10.54
 	
 	pop {r4, r5, r6, r7, r8, r9}