From f25fb4e30617df0c5093c79b8d33b55b3b956367 Mon Sep 17 00:00:00 2001
From: DieHertz <diehertz@gmail.com>
Date: Mon, 12 Dec 2016 22:02:58 +0300
Subject: [PATCH] Prevent serial buffer overflow in BLHeli Passthrough code

---
 src/main/io/serial_4way.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/main/io/serial_4way.c b/src/main/io/serial_4way.c
index 3166e3af9..f2d056360 100644
--- a/src/main/io/serial_4way.c
+++ b/src/main/io/serial_4way.c
@@ -807,6 +807,8 @@ void esc4wayProcess(serialPort_t *mspPort)
 
         i=O_PARAM_LEN;
         do {
+            while (!serialTxBytesFree(port));
+
             WriteByteCrc(*O_PARAM);
             O_PARAM++;
             i--;