From 7881e68efeb20071772133d3b590362117951e64 Mon Sep 17 00:00:00 2001
From: Marc Emmers <m.emmers@syrinx.nl>
Date: Thu, 25 Jan 2018 17:24:57 +0100
Subject: [PATCH] STM32L0: Enable stop mode operation for the LPUART

---
 targets/TARGET_STM/serial_api.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/targets/TARGET_STM/serial_api.c b/targets/TARGET_STM/serial_api.c
index 437560934b..a3209f1f6d 100644
--- a/targets/TARGET_STM/serial_api.c
+++ b/targets/TARGET_STM/serial_api.c
@@ -525,6 +525,18 @@ HAL_StatusTypeDef init_uart(serial_t *obj)
         huart->Init.Mode = UART_MODE_TX_RX;
     }
 
+#if defined(LPUART1_BASE)
+    if (huart->Instance == LPUART1) {
+        if (obj_s->baudrate <= 9600) {
+            HAL_UARTEx_EnableClockStopMode(huart);
+            HAL_UARTEx_EnableStopMode(huart);
+        } else {
+            HAL_UARTEx_DisableClockStopMode(huart);
+            HAL_UARTEx_DisableStopMode(huart);
+        }
+    }
+#endif
+
     return HAL_UART_Init(huart);
 }