From 3dd432577e3dbca911d968f3d3af5a78ad79626e Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Mon, 6 Oct 2014 04:11:45 -0400
Subject: better structure for the game code

shouldn't do everything in the NMI interrupt - only drawing should
happen there in order to make sure that gets done during vblank,
everything else should happen in the main loop
---
 main.s | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/main.s b/main.s
index aa4d596..d59c52a 100644
--- a/main.s
+++ b/main.s
@@ -17,6 +17,7 @@ BANKS       1
 
 .ENUM $0000
 buttons_pressed DB
+sleeping        DB
 .ENDE
 
 
@@ -66,6 +67,7 @@ clrmem:
   ; initialize variables in ram
   LDA #$00
   STA buttons_pressed
+  STA sleeping
 
 vblankwait2:      ; Second wait for vblank, PPU is ready after this
   BIT $2002
@@ -93,11 +95,34 @@ LoadPalettesLoop:
   STA $2000
 
 loop:
+  INC sleeping
+sleep:
+  LDA sleeping
+  BNE sleep
+
+  JSR read_controller1
+
+  ; game logic
+
   JMP loop
 
 NMI:
-  JSR read_controller1
-  ; ...
+  PHA
+  TXA
+  PHA
+  TYA
+  PHA
+
+  ; drawing code
+
+  LDA #$00
+  STA sleeping
+
+  PLA
+  TAY
+  PLA
+  TAX
+  PLA
   RTI
 
 read_controller1:
-- 
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