From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 28 Oct 2013 20:11:14 +0000 (+0200)
Subject: Respond to a zero-length packet with another zero-length packet
X-Git-Url: http://git.tdb.fi/?p=model-railway-devices.git;a=commitdiff_plain;h=6f462a32920aa215a20b6512223e33df257d9f3a

Respond to a zero-length packet with another zero-length packet

This could be useful for sync recovery
---

diff --git a/arducontrol/interface.c b/arducontrol/interface.c
index 675770f..1cc4b15 100644
--- a/arducontrol/interface.c
+++ b/arducontrol/interface.c
@@ -24,9 +24,11 @@ void interface_check(void)
 	{
 		uint8_t length = ~serial_read();
 
-		if(length>=0x10)
+		if(length==0)
+			serial_write(0xFF);
+		else if(length>=0x10)
 			interface_send1(FRAMING_ERROR);
-		else if(length>0)
+		else
 		{
 			uint8_t cmd[15];
 			uint8_t i;