finish usb uart lib

lib/SerialUSBHost/include/SerialUSBHost.h

@@ -23,20 +23,40 @@ public:
     SerialUSBHost() = delete;
     static void init(uint32_t baudrate, uint8_t stop_bits, uint8_t parity, uint8_t dataBits);
 
+
+private:
+    /**
+     * @brief Device event callback
+     *
+     * Apart from handling device disconnection it doesn't do anything useful
+     *
+     * @param[in] event    Device event type and data
+     * @param[in] user_ctx Argument we passed to the device open function
+     */
     static void handle_event(const cdc_acm_host_dev_event_data_t *event, void *user_ctx);
+
+    /**
+     * @brief Data received callback
+     *
+     * Just pass received data to stdout
+     *
+     * @param[in] data     Pointer to received data
+     * @param[in] data_len Length of received data in bytes
+     * @param[in] arg      Argument we passed to the device open function
+     * @return
+     *   true:  We have processed the received data
+     *   false: We expect more data
+     */
     static bool handle_rx(const uint8_t *data, size_t data_len, void *arg);
 
-    static void takeSem();//XXX
-
-    static cdc_acm_host_device_config_t* getDevConfig();
-    static cdc_acm_line_coding_t* getLineCoding();
-private:
     /**
      * @brief USB Host library handling task
      * 
      * @param arg unused but required for task
      */
     static void usb_lib_task(void* arg);
+    static void mainTask(void* arg);
+
 };