From 91f3c58738b6baf79e62adfdedfc5557dfcf3c02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kim=20J=C3=B8rgensen?= <kim@ik2.dk>
Date: Mon, 2 May 2022 20:51:53 +0200
Subject: [PATCH] Fix timing problems on some C64s

---
 firmware/stm32f4xx/c64_interface.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/firmware/stm32f4xx/c64_interface.h b/firmware/stm32f4xx/c64_interface.h
index 0768813..da0213d 100644
--- a/firmware/stm32f4xx/c64_interface.h
+++ b/firmware/stm32f4xx/c64_interface.h
@@ -134,8 +134,8 @@ static void handler(void)
     COMPILER_BARRIER();                                                         \
     while (DWT->CYCCNT < phi2_high);                                            \
     u32 addr = C64_ADDR_READ();                                                 \
-    COMPILER_BARRIER();                                                         \
     u32 control = C64_CONTROL_READ();                                           \
+    COMPILER_BARRIER();                                                         \
     if (control & C64_WRITE)                                                    \
     {                                                                           \
         if (read_handler(control, addr))                                        \