Reset CDC examples to original state

1 files changed, 16 insertions, 13 deletions

diff --git a/examples/device/cdc_msc/src/main.c b/examples/device/cdc_msc/src/main.c
index bcf05eaac..a407e2ddd 100644
--- a/examples/device/cdc_msc/src/main.c
+++ b/examples/device/cdc_msc/src/main.c
@@ -105,31 +105,34 @@ void tud_resume_cb(void)
 //--------------------------------------------------------------------+
 void cdc_task(void)
 {
-  // is data available to read from rx fifo
-  if ( tud_cdc_available() )
+  if ( tud_cdc_connected() )
   {
-    uint8_t buf[64];
+    // connected and there are data available
+    if ( tud_cdc_available() )
+    {
+      uint8_t buf[64];
 
-    // read and echo back
-    uint32_t count = tud_cdc_read(buf, sizeof(buf));
+      // read and echo back
+      uint32_t count = tud_cdc_read(buf, sizeof(buf));
 
-    for(uint32_t i=0; i<count; i++)
-    {
-      tud_cdc_write_char(buf[i]);
+      for(uint32_t i=0; i<count; i++)
+      {
+        tud_cdc_write_char(buf[i]);
 
-      if ( buf[i] == '\r' ) tud_cdc_write_char('\n');
-    }
+        if ( buf[i] == '\r' ) tud_cdc_write_char('\n');
+      }
 
-    tud_cdc_write_flush();
+      tud_cdc_write_flush();
+    }
   }
 }
 
-// Invoked when cdc line state changed e.g connected/disconnected
+// Invoked when cdc when line state changed e.g connected/disconnected
 void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
 {
   (void) itf;
 
-  // usually terminal software sets DTR and RTS when connected
+  // connected
   if ( dtr && rts )
   {
     // print initial message when connected