clean up some examples

examples/device/cdc_dual_ports/src/main.c

@@ -63,13 +63,11 @@ static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count)
     }
     else
     {
-      // echo back additional ports as upper case
+      // echo back 2nd port as upper case
       if (islower(buf[i])) buf[i] -= 'a' - 'A';
     }
 
     tud_cdc_n_write_char(itf, buf[i]);
-
-    if ( buf[i] == '\r' ) tud_cdc_n_write_char(itf, '\n');
   }
   tud_cdc_n_write_flush(itf);
 }
@@ -85,7 +83,7 @@ static void cdc_task(void)
   {
     // connected() check for DTR bit
     // Most but not all terminal client set this when making connection
-    if ( tud_cdc_n_connected(itf) )
+    // if ( tud_cdc_n_connected(itf) )
     {
       if ( tud_cdc_n_available(itf) )
       {