From 7a4c9a92ac827df5cf5620e6cd3b9ad33d42e237 Mon Sep 17 00:00:00 2001
From: cpldcpu <cpldcpu@gmail.com>
Date: Sat, 28 Dec 2013 15:11:39 +0100
Subject: firmware: CRC checking of all received data

backport of optimizations by @gblargg
---
 firmware/usbconfig.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/firmware/usbconfig.h b/firmware/usbconfig.h
index 560c34d..8ccee36 100644
--- a/firmware/usbconfig.h
+++ b/firmware/usbconfig.h
@@ -110,6 +110,12 @@
  * for long transfers increases the driver size.
  */
 /* #define USB_RX_USER_HOOK(data, len)     if(usbRxToken == (uchar)USBPID_SETUP) blinkLED(); */
+
+// Check CRC of all received data
+#define USB_RX_USER_HOOK( data, len ) { \
+if ( usbCrc16( data, len + 2 ) != 0x4FFE )\
+return;\
+}
 /* This macro is a hook if you want to do unconventional things. If it is
  * defined, it's inserted at the beginning of received message processing.
  * If you eat the received message and don't want default processing to
-- 
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