From e5d9bb90136d513e6b62d473a7f8a5ad9eeecf54 Mon Sep 17 00:00:00 2001
From: zylx <yuhaodi@rt-thread.com>
Date: Sat, 4 Aug 2018 17:38:16 +0800
Subject: [PATCH] [net][at] fix repeated enter issue

---
 components/net/at/src/at_client.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/components/net/at/src/at_client.c b/components/net/at/src/at_client.c
index 90fd3291c3..8e5161f2ce 100644
--- a/components/net/at/src/at_client.c
+++ b/components/net/at/src/at_client.c
@@ -355,10 +355,10 @@ static char at_client_getchar(void)
 {
     char ch;
 
-    if (rt_device_read(at_client_local->device, 0, &ch, 1) == 0)
+    while (rt_device_read(at_client_local->device, 0, &ch, 1) == 0)
     {
+        rt_sem_control(at_client_local->rx_notice, RT_IPC_CMD_RESET, RT_NULL);
         rt_sem_take(at_client_local->rx_notice, RT_WAITING_FOREVER);
-        rt_device_read(at_client_local->device, 0, &ch, 1);
     }
 
     return ch;