fix dfu-rt to response to SET_INTERFACE and DFU_GETSTATUS

fix #450

src/class/cdc/cdc_device.c

@@ -364,7 +364,7 @@ bool cdcd_control_request(uint8_t rhport, tusb_control_request_t const * request
       tud_control_status(rhport, request);
 
       // Invoke callback
-      if ( tud_cdc_line_state_cb) tud_cdc_line_state_cb(itf, dtr, rts);
+      if ( tud_cdc_line_state_cb ) tud_cdc_line_state_cb(itf, dtr, rts);
     }
     break;
 

src/class/dfu/dfu_rt_device.c

@@ -44,6 +44,14 @@ typedef enum {
   DFU_REQUEST_ABORT       = 6,
 } dfu_requests_t;
 
+typedef struct TU_ATTR_PACKED
+{
+  uint8_t status;
+  uint8_t poll_timeout[3];
+  uint8_t state;
+  uint8_t istring;
+} dfu_status_t;
+
 //--------------------------------------------------------------------+
 // USBD Driver API
 //--------------------------------------------------------------------+
@@ -88,10 +96,19 @@ bool dfu_rtd_control_complete(uint8_t rhport, tusb_control_request_t const * req
 
 bool dfu_rtd_control_request(uint8_t rhport, tusb_control_request_t const * request)
 {
-  // Handle class request only
-  TU_VERIFY(request->bmRequestType_bit.type == TUSB_REQ_TYPE_CLASS);
   TU_VERIFY(request->bmRequestType_bit.recipient == TUSB_REQ_RCPT_INTERFACE);
 
+  // dfu-util will try to claim the interface with SET_INTERFACE request before sending DFU request
+  if ( TUSB_REQ_TYPE_STANDARD == request->bmRequestType_bit.type &&
+       TUSB_REQ_SET_INTERFACE == request->bRequest )
+  {
+    tud_control_status(rhport, request);
+    return true;
+  }
+
+  // Handle class request only from here
+  TU_VERIFY(request->bmRequestType_bit.type == TUSB_REQ_TYPE_CLASS);
+
   switch ( request->bRequest )
   {
     case DFU_REQUEST_DETACH:
@@ -99,6 +116,14 @@ bool dfu_rtd_control_request(uint8_t rhport, tusb_control_request_t const * requ
       tud_dfu_rt_reboot_to_dfu();
     break;
 
+    case DFU_REQUEST_GETSTATUS:
+    {
+      // status = OK, poll timeout = 0, state = app idle, istring = 0
+      uint8_t status_response[6] = { 0, 0, 0, 0, 0, 0 };
+      tud_control_xfer(rhport, request, status_response, sizeof(status_response));
+    }
+    break;
+
     default: return false; // stall unsupported request
   }