7 files changed, 14 insertions, 7 deletions
diff --git a/examples/device/device_virtual_com/src/tusb_config.h b/examples/device/device_virtual_com/src/tusb_config.h
index a69d2ecbb..511b81b78 100644
--- a/examples/device/device_virtual_com/src/tusb_config.h
+++ b/examples/device/device_virtual_com/src/tusb_config.h
@@ -90,7 +90,7 @@
 
 
 // TX is sent automatically every Start of Frame event.
-// If not enabled, application must call tud_cdc_flush() periodically
+// If not enabled, application must call tud_cdc_write_flush() periodically
 #define CFG_TUD_CDC_FLUSH_ON_SOF    1
 
 //--------------------------------------------------------------------+
diff --git a/examples/device/nrf52840/src/main.c b/examples/device/nrf52840/src/main.c
index e6a6388bf..ec574738e 100644
--- a/examples/device/nrf52840/src/main.c
+++ b/examples/device/nrf52840/src/main.c
@@ -87,7 +87,7 @@ void virtual_com_task(void)
     uint32_t count = tud_cdc_read(buf, sizeof(buf));
 
     tud_cdc_write(buf, count);
-    tud_cdc_flush();
+    tud_cdc_write_flush();
   }
 }
 
diff --git a/examples/device/nrf52840/src/tusb_config.h b/examples/device/nrf52840/src/tusb_config.h
index 258a5983d..62c788413 100644
--- a/examples/device/nrf52840/src/tusb_config.h
+++ b/examples/device/nrf52840/src/tusb_config.h
@@ -86,7 +86,7 @@
 #define CFG_TUD_CDC_TX_BUFSIZE    64
 
 // TX is sent automatically every Start of Frame event.
-// If not enabled, application must call tud_cdc_flush() periodically
+// If not enabled, application must call tud_cdc_write_flush() periodically
 #define CFG_TUD_CDC_FLUSH_ON_SOF    0
 
 /*------------------------------------------------------------------*/
diff --git a/examples/obsolete/device/src/tusb_config.h b/examples/obsolete/device/src/tusb_config.h
index 16003dd6d..8c8d32514 100644
--- a/examples/obsolete/device/src/tusb_config.h
+++ b/examples/obsolete/device/src/tusb_config.h
@@ -88,7 +88,7 @@
 
 
 // TX is sent automatically in Start of Frame event.
-// If not enabled, application must call tud_cdc_flush() periodically
+// If not enabled, application must call tud_cdc_write_flush() periodically
 #define CFG_TUD_CDC_FLUSH_ON_SOF  1
 
 
diff --git a/src/class/cdc/cdc_device.c b/src/class/cdc/cdc_device.c
index 04402c5bb..bcef47136 100644
--- a/src/class/cdc/cdc_device.c
+++ b/src/class/cdc/cdc_device.c
@@ -136,6 +136,11 @@ char tud_cdc_n_peek(uint8_t itf, int pos)
   return tu_fifo_peek_at(&_cdcd_itf[itf].intact.rx_ff, pos, &ch) ? ch : (-1);
 }
 
+void tud_cdc_n_read_flush (uint8_t itf)
+{
+  tu_fifo_clear(&_cdcd_itf[itf].intact.rx_ff);
+}
+
 //--------------------------------------------------------------------+
 // WRITE API
 //--------------------------------------------------------------------+
@@ -150,7 +155,7 @@ uint32_t tud_cdc_n_write(uint8_t itf, void const* buffer, uint32_t bufsize)
   return tu_fifo_write_n(&_cdcd_itf[itf].intact.tx_ff, buffer, bufsize);
 }
 
-bool tud_cdc_n_flush (uint8_t itf)
+bool tud_cdc_n_write_flush (uint8_t itf)
 {
   uint8_t  edpt = _cdcd_itf[itf].ep_in;
   VERIFY( !dcd_edpt_busy(TUD_RHPORT, edpt) ); // skip if previous transfer not complete
diff --git a/src/class/cdc/cdc_device.h b/src/class/cdc/cdc_device.h
index c815a42b6..0a1b2ca8f 100644
--- a/src/class/cdc/cdc_device.h
+++ b/src/class/cdc/cdc_device.h
@@ -64,11 +64,12 @@ void     tud_cdc_n_set_wanted_char (uint8_t itf, char wanted);
 uint32_t tud_cdc_n_available       (uint8_t itf);
 char     tud_cdc_n_read_char       (uint8_t itf);
 uint32_t tud_cdc_n_read            (uint8_t itf, void* buffer, uint32_t bufsize);
+void     tud_cdc_n_read_flush      (uint8_t itf);
 char     tud_cdc_n_peek            (uint8_t itf, int pos);
 
 uint32_t tud_cdc_n_write_char      (uint8_t itf, char ch);
 uint32_t tud_cdc_n_write           (uint8_t itf, void const* buffer, uint32_t bufsize);
-bool     tud_cdc_n_flush           (uint8_t itf);
+bool     tud_cdc_n_write_flush     (uint8_t itf);
 
 //--------------------------------------------------------------------+
 // APPLICATION API (Interface0)
@@ -85,7 +86,7 @@ static inline char     tud_cdc_peek            (int pos)
 
 static inline uint32_t tud_cdc_write_char      (char ch)                              { return tud_cdc_n_write_char(0, ch);         }
 static inline uint32_t tud_cdc_write           (void const* buffer, uint32_t bufsize) { return tud_cdc_n_write(0, buffer, bufsize); }
-static inline bool     tud_cdc_flush           (void)                                 { return tud_cdc_n_flush(0);                  }
+static inline bool     tud_cdc_write_flush     (void)                                 { return tud_cdc_n_write_flush(0);            }
 
 //--------------------------------------------------------------------+
 // APPLICATION CALLBACK API (WEAK is optional)
diff --git a/src/common/tusb_verify.h b/src/common/tusb_verify.h
index 0e1f3b934..95816a0e7 100644
--- a/src/common/tusb_verify.h
+++ b/src/common/tusb_verify.h
@@ -61,6 +61,7 @@
 // VERIFY Helper
 //--------------------------------------------------------------------+
 #if CFG_TUSB_DEBUG >= 1
+  #include <stdio.h>
   #define _MESS_ERR(_err)         printf("%s: %d: failed, error = %s\n", __func__, __LINE__, tusb_strerr[_err])
   #define _MESS_FAILED()          printf("%s: %d: failed\n", __func__, __LINE__)
 #else