From 96a1c1ae8fc7589554658e80fb098f0af5055367 Mon Sep 17 00:00:00 2001
From: Maciej Bocianski <maciej.bocianski@gmail.com>
Date: Wed, 30 Oct 2019 14:08:21 +0100
Subject: [PATCH] LPC55S69: fix serial_set_flow_control

---
 .../TARGET_MCUXpresso_MCUS/TARGET_LPC/serial_api.c   | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/serial_api.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/serial_api.c
index 04d347524a..f1307cf005 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/serial_api.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/serial_api.c
@@ -398,8 +398,10 @@ void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, Pi
 
         case FlowControlCTS:
             /* Do not use RTS, configure pin to GPIO input */
-            gpio_init(&gpio, rxflow);
-            gpio_dir(&gpio, PIN_INPUT);
+            if (rxflow != NC) {
+                gpio_init(&gpio, rxflow);
+                gpio_dir(&gpio, PIN_INPUT);
+            }
 
             pinmap_pinout(txflow, PinMap_UART_CTS);
             uart_addrs[obj->index]->CFG |= USART_CFG_CTSEN_MASK;
@@ -413,8 +415,10 @@ void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, Pi
 
         case FlowControlNone:
             /* Do not use RTS, configure pin to GPIO input */
-            gpio_init(&gpio, rxflow);
-            gpio_dir(&gpio, PIN_INPUT);
+            if (rxflow != NC) {
+                gpio_init(&gpio, rxflow);
+                gpio_dir(&gpio, PIN_INPUT);
+            }
 
             uart_addrs[obj->index]->CFG &= ~USART_CFG_CTSEN_MASK;
             break;