From 4aeb0ab80fee07b2e025a4a5be6c770cfb7e0798 Mon Sep 17 00:00:00 2001
From: tangyuxin <462747508@qq.com>
Date: Fri, 15 Feb 2019 15:29:29 +0800
Subject: [PATCH] =?UTF-8?q?=E3=80=90=E4=BF=AE=E5=A4=8D=E3=80=91=E5=BD=93?=
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---
 port/mphalport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/port/mphalport.c b/port/mphalport.c
index 94a334e..48b4046 100644
--- a/port/mphalport.c
+++ b/port/mphalport.c
@@ -37,7 +37,7 @@ int mp_hal_stdin_rx_chr(void) {
     char ch;
     while (1) {
         ch = rtt_getchar();
-        if (ch != 0xFF) {
+        if (ch != (char)0xFF) {
             break;
         }
         MICROPY_EVENT_POLL_HOOK;