From f91c948fd0d295882a03c7eb82c5e6062c724dda Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Fri, 5 Nov 2021 15:34:12 +1100
Subject: [PATCH] AP_SerialManager: disable unused RX/TX pins on uarts

---
 libraries/AP_SerialManager/AP_SerialManager.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/AP_SerialManager/AP_SerialManager.cpp b/libraries/AP_SerialManager/AP_SerialManager.cpp
index f20f3e99ba..5591420a73 100644
--- a/libraries/AP_SerialManager/AP_SerialManager.cpp
+++ b/libraries/AP_SerialManager/AP_SerialManager.cpp
@@ -417,6 +417,9 @@ void AP_SerialManager::init()
             set_options(i);
             switch (state[i].protocol) {
                 case SerialProtocol_None:
+                    // disable RX and TX pins in case they are shared
+                    // with another peripheral (eg. RCIN pin)
+                    uart->disable_rxtx();
                     break;
                 case SerialProtocol_Console:
                 case SerialProtocol_MAVLink: