A2osX/SYS/KERNEL.S.EVT.txt

PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
				.LIST OFF
				.OP	65C02
*--------------------------------------
* S.EvtMgrInit
*--------------------------------------
S.EvtMgrInit	stz EVTMGR.PENDING
				clc
				rts
*--------------------------------------
* GETEVENT :
*  IN :
*  OUT : 
*   CS = no event, A = ERROR
*   CC * event in YA
*   (pEvent)
*--------------------------------------
S.GetEvent		lda EVTMGR.PENDING		Get Pending EVENT hMem if any
				beq .1
				jsr S.GetMemPtrA
				>STYA pEvent
				clc
				rts
				
.1				jsr S.CreateEvent
				bcs .9

				jsr S.GetSysEvent
				bcc .9					got SYS event
				jsr S.GetDevEvent
				bcc .9					got DEV event	
				jsr S.DestroyEvent		discard empty event
				lda #0					error code=0
				sec						no event
.9				rts				
*--------------------------------------
S.GetSysEvent	lda VBL					get VLINE status
				eor EVTMGR.VBLSTATE			
				bpl .9					no change
				
				sta EVTMGR.VBLSTATE		save new

				dec EVTMGR.FRAMECNT
				bne .9
				lda #K.TIMER16RESOLUTION
				sta EVTMGR.FRAMECNT
				
				inc A2osX.TIMER16
				bne .1
				inc A2osX.TIMER16+1

.1				lda #S.EVT.F.TIMER
				
.8				sta (pEvent)
 				clc
				rts

.9				lda #0					error code=0
				sec						no event
				rts
*--------------------------------------
* S.CreateEvent
* OUT :
*   X = hMem
*	Y,A = PTR to EVENT
*--------------------------------------
S.CreateEvent	>PUSHWI S.EVT.SIZE
				>PUSHBI S.MEM.F.INIT0
				jsr S.GetMem
				bcs .9
				>STYA pEvent
				stx EVTMGR.PENDING
.9				rts
*--------------------------------------
* S.DestroyEvent
* IN : 
*  A = Event hMem
* OUT :
*--------------------------------------
S.DestroyEvent	lda EVTMGR.PENDING
				beq .9
			
				lda (pEvent)
				and #S.EVT.F.hMEM1
				beq .1
				
				ldy #S.EVT.DATALO
				lda (pEvent),y
				jsr S.FreeMemA
				
.1				lda (pEvent)
				and #S.EVT.F.hMEM2
				beq .2
				
				ldy #S.EVT.DATAHI
				lda (pEvent),y
				jsr S.FreeMemA
				
.2				lda EVTMGR.PENDING
				jsr S.FreeMemA
				stz EVTMGR.PENDING
.9				rts
*--------------------------------------
EVTMGR.VBLSTATE	.BS 1
EVTMGR.FRAMECNT	.BS 1
EVTMGR.PENDING	.BS 1
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.EVT
LOAD SYS/KERNEL.S
ASM