From e87529b4e434e1c500a71e9582d214ab0d0afe35 Mon Sep 17 00:00:00 2001
From: Marius <marius@twostairs.com>
Date: Sun, 15 Sep 2019 22:38:18 +0200
Subject: [PATCH] Pull-up on RX pin

---
 cpu/stm32_common/periph/uart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpu/stm32_common/periph/uart.c b/cpu/stm32_common/periph/uart.c
index 28cc9ddfb6..e93f97f80e 100644
--- a/cpu/stm32_common/periph/uart.c
+++ b/cpu/stm32_common/periph/uart.c
@@ -88,7 +88,7 @@ static inline void uart_init_pins(uart_t uart, uart_rx_cb_t rx_cb)
 #endif
     /* configure RX pin */
     if (rx_cb) {
-        gpio_init(uart_config[uart].rx_pin, GPIO_IN);
+        gpio_init(uart_config[uart].rx_pin, GPIO_IN_PU);
 #ifndef CPU_FAM_STM32F1
         gpio_init_af(uart_config[uart].rx_pin, uart_config[uart].rx_af);
 #endif