adding tuh_cdc_mount_cb/tuh_cdc_umount_cb

start adding cdc_app.c to example

src/class/cdc/cdc_host.c

@@ -239,6 +239,8 @@ bool cdch_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *it
 bool cdch_set_config(uint8_t dev_addr, uint8_t itf_num)
 {
   (void) dev_addr; (void) itf_num;
+
+  if (tuh_cdc_mount_cb) tuh_cdc_mount_cb(dev_addr);
   return true;
 }
 
@@ -254,6 +256,16 @@ void cdch_close(uint8_t dev_addr)
   TU_VERIFY(dev_addr <= CFG_TUH_DEVICE_MAX, );
 
   cdch_data_t * p_cdc = get_itf(dev_addr);
+
+  // Invoke application callback
+  if (tuh_cdc_umount_cb)
+  {
+    if (p_cdc->ep_out || p_cdc->ep_in || p_cdc->ep_notif)
+    {
+      tuh_cdc_umount_cb(dev_addr);
+    }
+  }
+
   tu_memclr(p_cdc, sizeof(cdch_data_t));
 }
 

src/class/cdc/cdc_host.h

@@ -34,13 +34,18 @@
 #endif
 
 //--------------------------------------------------------------------+
-// CDC APPLICATION PUBLIC API
+// Application API
 //--------------------------------------------------------------------+
-/** \ingroup ClassDriver_CDC Communication Device Class (CDC)
- * \addtogroup CDC_Serial Serial
- * @{
- * \defgroup   CDC_Serial_Host Host
- * @{ */
+
+
+//------------- Application Callback -------------//
+
+// Invoked when a device with CDC interface is mounted
+TU_ATTR_WEAK void tuh_cdc_mount_cb(uint8_t dev_addr);
+
+// Invoked when a device with CDC interface is unmounted
+TU_ATTR_WEAK void tuh_cdc_umount_cb(uint8_t dev_addr);
+
 
 bool tuh_cdc_set_control_line_state(uint8_t dev_addr, bool dtr, bool rts, tuh_xfer_cb_t complete_cb);