From 7ec1c45d7913af6cac32d5150026ceffc6704bf4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Hohensohn?= <hohensoh@rockbox.org>
Date: Fri, 7 Nov 2003 21:03:41 +0000
Subject: [PATCH] set/clear port bits with atomic instructions instead of
 read-modify-write, saves time+space, allows port usage in ISR

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4026 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/usb.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/firmware/usb.c b/firmware/usb.c
index d513d10e55..00fec53afa 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -72,10 +72,14 @@ static void usb_enable(bool on)
 #endif
     
     if(on)
-        PADR &= ~0x400; /* enable USB */
+    {
+        and_b(~0x04, &PADRH); /* enable USB */
+    }
     else
-        PADR |= 0x400;
-    PAIOR |= 0x400;
+    {
+        or_b(0x04, &PADRH);
+    }
+    or_b(0x04, &PAIORH);
 }
 
 static void usb_slave_mode(bool on)