解决串口命令异常，增大串口缓存

bspMCU/l_uart.c

@@ -45,11 +45,14 @@ static int l_com_new(lua_State *L)
         
     if (id == 1 || id == 2)
     {    
-        TUartUserData *ptUartUserData = UART_userdata_init(LUACOM_ID, baudrate, 0);
+        TUartUserData *ptUartUserData = UART_userdata_init(LUACOM_ID, baudrate, 4096);
         if (NULL == ptUartUserData) 
         {
             lua_print("com is already used\n");
-            return g_ptCom1;
+            u->m_ptComCtrl = g_ptCom1;
+            luaL_getmetatable(L, "stm32.COMMT");
+			lua_setmetatable(L, -2);
+			return 1;
         }
         g_ptCom1 = rd_ComCreate(NULL, NULL, COM1_Send, ptUartUserData->m_buf_size, ptUartUserData);
         UART_IT_init(g_ptCom1);
@@ -62,8 +65,11 @@ static int l_com_new(lua_State *L)
         g_ptCom0 = bsp_usb_init();
 #endif
 #else
-        TUartUserData *ptUartUserData = UART_userdata_init(0, baudrate, 0);
+        TUartUserData *ptUartUserData = UART_userdata_init(0, baudrate, 4096);
-        if (NULL == ptUartUserData) lua_print("com is already used\n");
+        if (NULL == ptUartUserData)
+        {
+        	lua_print("com is already used\n");
+        }
         g_ptCom0 = rd_ComCreate(NULL, NULL, COM0_Send, ptUartUserData->m_buf_size, ptUartUserData);
         UART_IT_init(g_ptCom0);
 #endif