PRESERVE8
	THUMB   

	import LongueurSon 
	import PeriodeSonMicroSec
	import Son
		
	include Driver/DriverJeuLaser.inc

; ====================== zone de réservation de données,  ======================================
;Section RAM (read only) :
	area    mesdata,data,readonly


;Section RAM (read write):
	area    maram,data,readwrite
		

Son_index dcd 0
Sortie_son dcw 0
	
; ===============================================================================================
	

	EXPORT Son_index
	EXPORT Sortie_son

		
;Section ROM code (read only) :		
	area    moncode,code,readonly
; écrire le code ici	

	EXPORT GestionSon
	EXPORT StartSon
StartSon proc
	eor r0, r0
	ldr r1, =Son_index
	str r0, [r1]
	bx lr
	endp

GestionSon proc
	ldr r2, =LongueurSon
	ldr r0, [r2]
	ldr r2, =Son_index
	ldr r1, [r2]
	cmp r0, r1
	bls EndOfSound ; if (LongeurSon <= Son_index) goto ResetGestionSon;
	ldr r3, =Son
	ldrsh r0, [r3, r1, lsl #1]
			; r0 = Son[Son_index]
	add r0, #32768
	mov r3, #720
	mul r0, r3 
	lsr r0, #16 ;x in [-32768; 32767] -> x in [0; 719]
	ldr r3, =Sortie_son
	str r0, [r3]  ; Sortie_son = x
	add r1, r1, #1
	str r1, [r2]  ; Son_index++;
	b PWM_Set_Value_TIM3_Ch3
EndOfSound
	bx lr
	endp
	END