From 633fb0f555c29f19f6c7a875ee50f121a627ab12 Mon Sep 17 00:00:00 2001
From: Arisotura <thetotalworm@gmail.com>
Date: Tue, 26 Mar 2019 18:34:01 +0100
Subject: NDSCart: KEY1-gap delays don't apply when the WR bit is set. fixes
 #377

---
 src/NDSCart.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/NDSCart.cpp b/src/NDSCart.cpp
index a98f8c8..4266639 100644
--- a/src/NDSCart.cpp
+++ b/src/NDSCart.cpp
@@ -1260,8 +1260,14 @@ void WriteROMCnt(u32 val)
     // TODO: advance read position if bit28 is set
 
     u32 xfercycle = (ROMCnt & (1<<27)) ? 8 : 5;
-    u32 cmddelay = 8 + (ROMCnt & 0x1FFF);
-    if (datasize) cmddelay += ((ROMCnt >> 16) & 0x3F);
+    u32 cmddelay = 8;
+
+    // delays are only applied when the WR bit is cleared
+    if (!(ROMCnt & (1<<30)))
+    {
+        cmddelay += (ROMCnt & 0x1FFF);
+        if (datasize) cmddelay += ((ROMCnt >> 16) & 0x3F);
+    }
 
     if (datasize == 0)
         NDS::ScheduleEvent(NDS::Event_ROMTransfer, false, xfercycle*cmddelay, ROMEndTransfer, 0);
-- 
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