From 537942c9edb37ebfc88d8b06fd330e8492d36bee Mon Sep 17 00:00:00 2001
From: Martin Ling <martin-git@earth.li>
Date: Tue, 17 Dec 2013 17:19:55 +0000
Subject: [PATCH] Windows: clear errors after port open.

---
 serialport.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/serialport.c b/serialport.c
index db77080..e935464 100644
--- a/serialport.c
+++ b/serialport.c
@@ -608,8 +608,9 @@ enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
 	DEBUG("Opening port %s", port->name);
 
 #ifdef _WIN32
-	DWORD desired_access = 0, flags_and_attributes = 0;
+	DWORD desired_access = 0, flags_and_attributes = 0, errors;
 	char *escaped_port_name;
+	COMSTAT status;
 
 	/* Prefix port name with '\\.\' to work with ports above COM9. */
 	if (!(escaped_port_name = malloc(strlen(port->name + 5))))
@@ -727,6 +728,10 @@ enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
 	data.term.c_cflag |= (CLOCAL | CREAD | HUPCL);
 #endif
 
+#ifdef _WIN32
+	ClearCommError(port->hdl, &errors, &status);
+#endif
+
 	ret = set_config(port, &data, &config);
 
 	if (ret < 0) {