解决在电脑配置 USB 接口之前接收到串口数据，导致后续无法接收问题

CH32V203/src/USBUsr/usb_prop.c

@@ -258,6 +258,8 @@ void USBD_Reset(void)
     SetDeviceAddress(0);
 
     bDeviceState = ATTACHED;
+
+    Vcom.in_ready = 1;
 }
 
 /*********************************************************************

CH32V203/src/vcom_serial.c

@@ -6,7 +6,7 @@
 #include "vcom_serial.h"
 
 
-volatile VCOM Vcom = {.in_ready = 1};
+volatile VCOM Vcom;
 
 VCOM_LINE_CODING LineCfg = {115200, 0, 0, 8};   // Baud rate, stop bits, parity bits, data bits