From 265fb971c091a30c042d908199e08cf7c251d435 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Sat, 16 Dec 2017 17:01:58 +0900
Subject: [PATCH] Fix USART for overrun error.

---
 contrib/usart-stm32f103.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/contrib/usart-stm32f103.c b/contrib/usart-stm32f103.c
index 23d848f..cc9b498 100644
--- a/contrib/usart-stm32f103.c
+++ b/contrib/usart-stm32f103.c
@@ -423,6 +423,12 @@ handle_intr (struct USART *USARTx, struct rb *rb2a, struct usart_stat *stat)
 	    stat->rx++;
 	}
     }
+  else if ((r & USART_SR_ORE))
+    {				/* Clear ORE */
+      uint32_t data = USARTx->DR;
+      asm volatile ("" : : "r" (data) : "memory");
+      stat->err_rx_overrun++;
+    }
 
   return tx_ready;
 }