From a43d77c2e3c90e90401392e9a7c26be5fea2545e Mon Sep 17 00:00:00 2001
From: MacRsh <MacRsh@outlook.com>
Date: Tue, 16 Jan 2024 04:10:20 +0800
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---
 source/service.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/service.c b/source/service.c
index 13afbb3..3998eb2 100644
--- a/source/service.c
+++ b/source/service.c
@@ -98,7 +98,7 @@ MR_WEAK int mr_printf_output(const char *buf, size_t size)
 {
     static int desc = -1;
 
-    if (desc < 0)
+    if (mr_dev_is_valid(desc) == MR_FALSE)
     {
 #ifndef MR_CFG_PRINTF_DEV_NAME
 #define MR_CFG_PRINTF_DEV_NAME          "serial1"
@@ -108,7 +108,7 @@ MR_WEAK int mr_printf_output(const char *buf, size_t size)
 #else
         console = mr_dev_open(MR_CFG_PRINTF_DEV_NAME, MR_OFLAG_RDWR | MR_OFLAG_NONBLOCK);
 #endif /* MR_USING_PRINTF_NONBLOCKING */
-        if (desc < 0)
+        if (mr_dev_is_valid(desc) == MR_FALSE)
         {
             return desc;
         }