From 98c8ddf1b8646ca17b33da5ae87b72c35cd79fb4 Mon Sep 17 00:00:00 2001
From: Johannes Theiner <j.theiner@live.de>
Date: Wed, 28 Nov 2018 13:29:15 +0100
Subject: [PATCH] =?UTF-8?q?a4:=20r=C3=BCckw=C3=A4rts=20z=C3=A4hlen=20und?=
 =?UTF-8?q?=20ausgeben?=
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---
 src/asm/a4.asm | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/asm/a4.asm b/src/asm/a4.asm
index 39fc754..ff9fdc7 100644
--- a/src/asm/a4.asm
+++ b/src/asm/a4.asm
@@ -13,7 +13,7 @@ status		db 00000000b	; Statusbyte
 
 tcounts		db 0		; Impulszaehler fuer Servo, Vorwaertszaehler
 tcountv		dw 100 * twait	; Impulszaehler fuer Verzoegerung * 10ms
-				; Rueckwaertszaehler
+count		db 8		; Rueckwaertszaehler
 frei		db 'frei  ', 0	; Texte
 belegt		db 'belegt  ', 0
 
@@ -85,9 +85,26 @@ start:
 again:
 
 ; Ihr Programmcode...
+	;Ausgabe der Zähler Variable
+	mov ax, [count]
+	
+	cmp ax, 0x0
+	jz ifzero
+
+	mov al, [count]
+	out leds, al
 
 	jmp again
-		
+
+
+ifzero: 
+	mov al, 0x3F
+	out sseg7, al
+	mov ax, [pieces]
+	mov [count], ax
+	ret
+
+
 ; Initialisierung Controller und Interruptsystem
 
 init:
@@ -161,6 +178,11 @@ isr_opentimer_out: ; Ausgang aus dem Service
 	iret
 	
 isr_lt: ; Lichttaster
+	mov ax, [count];Zählen
+	dec ax
+	mov [count], ax
+	iret
+	
 
 ; Ihr Programmcode
 
@@ -179,3 +201,4 @@ isr_servotimer_out: ; Ausgang aus dem Service
 	out ocw_2_3, al
 	iret
  
+