diff --git a/app/a.exe b/app/a.exe
index 6d5f1bd..fcc6dcb 100644
Binary files a/app/a.exe and b/app/a.exe differ
diff --git a/app/main.c b/app/main.c
index e6702b2..09b5329 100644
--- a/app/main.c
+++ b/app/main.c
@@ -1,25 +1,42 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <windows.h>
 
 #include "serial.h"
 
+int serial_com_id;
+
 int serial_test() {
   PORT COM1;
   char buff[1024] = {0};
   int  rcv_len    = 0;
 
-  printf("open com1\n");
-  COM1 = serial_init(17, 115200, 8, 1, 0);
+  printf("Start open com%d\n", serial_com_id);
+  COM1 = serial_init(serial_com_id, 115200, 8, 1, 0);
 
   while (1) {
-    Serial_SendData(COM1, "hello guoguo\n", 13);
+    Serial_SendData(COM1, "hello finny", 12);
     memset(buff, 0, 1024);
     rcv_len = Serial_ReciveData(COM1, buff, 1024);
     printf("rcv:%s\n", buff);
     Sleep(1);
   }
 }
-int main() {
+int main(int argc, char *argv[]) {
+  if (argc != 2) {
+    printf("please input com id\n");
+    return -1;
+  }
+  printf("Serial port number is:%s\n", argv[1]);
+
+  serial_com_id = atoi(argv[1]);
+
+  if (serial_com_id == 0) {
+    /* 转换错误 */
+    printf("The serial port id is incorrect\n");
+    return -2;
+  }
+
   serial_test();
   while (1) {
   }