grpE_REES_KOUTSODIMA/soft/PjtKEIL_StepSon/Src/GestionSon.s

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PRESERVE8
THUMB
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export CallbackSon
export index
export SortieSon
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export StartSon
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import LongueurSon
import Son
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import PWM_Set_Value_TIM3_Ch3
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; ====================== zone de r<>servation de donn<6E>es, ======================================
;Section RAM (read only) :
area mesdata,data,readonly
;Section RAM (read write):
area maram,data,readwrite
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SortieSon dcw 0
index dcd 0
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; ===============================================================================================
;Section ROM code (read only) :
area moncode,code,readonly
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; <20>crire le code ici
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CallbackSon proc
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push {lr,r4-r7}
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ldr r4,=LongueurSon
ldr r4,[r4]
ldr r2,=index
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ldr r7,[r2] ;r7 = valeur de index
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cmp r4,r7
bne alors
sinon
b finsi
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alors
ldr r3,=SortieSon
ldr r1,=Son
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ldrsh r0,[r1,r7,lsl#1] ; R0 = *(R1+2*R7 ) R0 = R1[R7]
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mov r5,#32768
add r0,r5
mov r6,#719
mul r0,r6
;ldr r6,=23560192 ;719*32768
asr r0,#16
;add r0,r6
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; mise <20> jour de SortieSon
strh r0,[r3]
;ldr r3,[r0]
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; mettre <20> jour la PWM
bl PWM_Set_Value_TIM3_Ch3 ;on appelle la fonction avec r0 en param<61>tre
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add r7,#1 ;index=index+1
str r7,[r2] ; *R2 = R7
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finsi
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pop {lr,r4-r7}
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bx lr
endp
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StartSon proc
ldr r0,=index
ldr r1,[r0]
mov r1,#0
str r1,[r0]
bx lr
endp
END