diff --git a/app/src/main/cpp/SerialComm.cpp b/app/src/main/cpp/SerialComm.cpp
index 4222349b..8a06ee94 100644
--- a/app/src/main/cpp/SerialComm.cpp
+++ b/app/src/main/cpp/SerialComm.cpp
@@ -51,16 +51,16 @@ static void set_parity (struct termios *opt, char parity)
 {
     switch (parity)
     {
-        case'N':/* 无校验 */
+        case 'N':/* 无校验 */
         case 'n':
             opt->c_cflag &= ~PARENB;
             break;
-        case'E':/*偶校验*/
+        case 'E':/*偶校验*/
         case 'e':
             opt->c_cflag |= PARENB;
             opt->c_cflag &= ~PARODD;
             break;
-        case'O':/* 奇校验 */
+        case 'O':/* 奇校验 */
         case 'o':
             opt->c_cflag |= PARENB;
             opt->c_cflag |= ~PARODD;