diff --git a/tinyusb/class/cdc/cdc_device.c b/tinyusb/class/cdc/cdc_device.c
index afb140f9..dbcebe5e 100644
--- a/tinyusb/class/cdc/cdc_device.c
+++ b/tinyusb/class/cdc/cdc_device.c
@@ -88,10 +88,25 @@ STATIC_VAR cdcd_data_t cdcd_data[CONTROLLER_DEVICE_NUMBER];
 //--------------------------------------------------------------------+
 bool tud_n_cdc_connected(uint8_t rhport)
 {
-  // Either RTS or DTR active considered as connected
+  // Either RTS  (bit 1) or DTR (bit 0) active considered as connected
+  // May only check for DTR only
   return (cdcd_data[rhport].line_state != 0);
 }
 
+uint8_t tud_n_cdc_get_line_state (uint8_t rhport)
+{
+  return cdcd_data[rhport].line_state;
+}
+
+void tud_n_cdc_get_line_coding (uint8_t rhport, cdc_line_coding_t* coding)
+{
+  (*coding) = cdcd_line_coding[rhport];
+}
+
+
+//--------------------------------------------------------------------+
+// READ API
+//--------------------------------------------------------------------+
 uint32_t tud_n_cdc_available(uint8_t rhport)
 {
   return fifo_count(&_rx_ff);
@@ -108,6 +123,10 @@ uint32_t tud_n_cdc_read(uint8_t rhport, void* buffer, uint32_t bufsize)
   return fifo_read_n(&_rx_ff, buffer, bufsize);
 }
 
+//--------------------------------------------------------------------+
+// WRITE API
+//--------------------------------------------------------------------+
+
 uint32_t tud_n_cdc_write_char(uint8_t rhport, char ch)
 {
   return fifo_write(&_tx_ff, &ch) ? 1 : 0;
diff --git a/tinyusb/class/cdc/cdc_device.h b/tinyusb/class/cdc/cdc_device.h
index 59ea13d2..60b7a787 100644
--- a/tinyusb/class/cdc/cdc_device.h
+++ b/tinyusb/class/cdc/cdc_device.h
@@ -56,29 +56,33 @@
 // APPLICATION API (Multiple Root Ports)
 // Should be used only with MCU that support more than 1 ports
 //--------------------------------------------------------------------+
-bool     tud_n_cdc_connected  (uint8_t rhport);
-uint32_t tud_n_cdc_available  (uint8_t rhport);
+bool     tud_n_cdc_connected       (uint8_t rhport);
+uint8_t  tud_n_cdc_get_line_state  (uint8_t rhport);
+void     tud_n_cdc_get_line_coding (uint8_t rhport, cdc_line_coding_t* coding);
 
-int8_t   tud_n_cdc_read_char  (uint8_t rhport);
-uint32_t tud_n_cdc_read       (uint8_t rhport, void* buffer, uint32_t bufsize);
+uint32_t tud_n_cdc_available       (uint8_t rhport);
+int8_t   tud_n_cdc_read_char       (uint8_t rhport);
+uint32_t tud_n_cdc_read            (uint8_t rhport, void* buffer, uint32_t bufsize);
 
-uint32_t tud_n_cdc_write_char (uint8_t rhport, char ch);
-uint32_t tud_n_cdc_write      (uint8_t rhport, void const* buffer, uint32_t bufsize);
-bool     tud_n_cdc_flush      (uint8_t rhport);
+uint32_t tud_n_cdc_write_char      (uint8_t rhport, char ch);
+uint32_t tud_n_cdc_write           (uint8_t rhport, void const* buffer, uint32_t bufsize);
+bool     tud_n_cdc_flush           (uint8_t rhport);
 
 //--------------------------------------------------------------------+
 // APPLICATION API (Single Port)
 // Should be used with MCU supporting only 1 USB port for code simplicity
 //--------------------------------------------------------------------+
-static inline bool     tud_cdc_connected  (void)                                 { return tud_n_cdc_connected(0);              }
-static inline uint32_t tud_cdc_available  (void)                                 { return tud_n_cdc_available(0);              }
+static inline bool     tud_cdc_connected       (void)                                       { return tud_n_cdc_connected(0);              }
+static inline uint8_t  tud_cdc_get_line_state  (uint8_t rhport)                             { return tud_n_cdc_get_line_state(0);         }
+static inline void     tud_cdc_get_line_coding (uint8_t rhport, cdc_line_coding_t* coding)  { return tud_cdc_get_line_coding(0, coding);  }
 
-static inline int8_t   tud_cdc_read_char  (void)                                 { return tud_n_cdc_read_char(0);              }
-static inline uint32_t tud_cdc_read       (void* buffer, uint32_t bufsize)       { return tud_n_cdc_read(0, buffer, bufsize);  }
+static inline uint32_t tud_cdc_available       (void)                                       { return tud_n_cdc_available(0);              }
+static inline int8_t   tud_cdc_read_char       (void)                                       { return tud_n_cdc_read_char(0);              }
+static inline uint32_t tud_cdc_read            (void* buffer, uint32_t bufsize)             { return tud_n_cdc_read(0, buffer, bufsize);  }
 
-static inline uint32_t tud_cdc_write_char (char ch)                              { return tud_n_cdc_write_char(0, ch);         }
-static inline uint32_t tud_cdc_write      (void const* buffer, uint32_t bufsize) { return tud_n_cdc_write(0, buffer, bufsize); }
-static inline bool     tud_cdc_flush      (void)                                 { return tud_n_cdc_flush(0);                  }
+static inline uint32_t tud_cdc_write_char      (char ch)                                    { return tud_n_cdc_write_char(0, ch);         }
+static inline uint32_t tud_cdc_write           (void const* buffer, uint32_t bufsize)       { return tud_n_cdc_write(0, buffer, bufsize); }
+static inline bool     tud_cdc_flush           (void)                                       { return tud_n_cdc_flush(0);                  }
 
 //--------------------------------------------------------------------+
 // APPLICATION CALLBACK API (WEAK is optional)