forked from acco/chti23
65 lines
No EOL
1,006 B
ArmAsm
65 lines
No EOL
1,006 B
ArmAsm
PRESERVE8
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THUMB
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; ====================== zone de réservation de données, ======================================
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;Section RAM (read only) :
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area mesdata,data,readonly
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;Section RAM (read write):
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area maram,data,readwrite
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SortieSon dcw 0
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index dcd 0
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; ===============================================================================================
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EXPORT CallbackSon ;
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EXTERN bruitverre ;
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EXTERN Son ;
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EXTERN LongueurSon ;
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EXPORT SortieSon ; //pour evaluer la variable lors des tests
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;Section ROM code (read only) :
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area moncode,code,readonly
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; écrire le code ici
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CallbackSon
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ldr r1, =index
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ldr r2, [r1]
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ldr r3, =Son
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ldr r0, LongueurSon
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cmp r2, r0
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ble notEqual
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bx lr
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notEqual
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mov r0, #2
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mul r0, r2
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ldrsh r0, [r3, r0]
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add r0, #32768
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push {r4}
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mov r4, #719
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mul r0, r4
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mov r4, #65535
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udiv r0, r4
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pop {r4}
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push {r7}
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ldr r7, =SortieSon
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str r0, [r7]
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pop {r7}
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add r2, #1
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push {r5}
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ldr r5, =index
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str r2, [r5]
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pop {r5}
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bx lr
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END
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