diff --git a/examples/dual/host_hid_to_device_cdc/only.txt b/examples/dual/host_hid_to_device_cdc/only.txt
index 6ee8e3fde..de5d8bed9 100644
--- a/examples/dual/host_hid_to_device_cdc/only.txt
+++ b/examples/dual/host_hid_to_device_cdc/only.txt
@@ -1,3 +1,4 @@
 board:mimxrt1060_evk
 board:mimxrt1064_evk
+board:mcb1800
 mcu:RP2040
diff --git a/src/host/hcd.h b/src/host/hcd.h
index 3355c18b2..cbfffb349 100644
--- a/src/host/hcd.h
+++ b/src/host/hcd.h
@@ -171,6 +171,9 @@ bool hcd_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const
 // Submit a transfer, when complete hcd_event_xfer_complete() must be invoked
 bool hcd_edpt_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t buflen);
 
+// Abort a queued transfer. Note: it can only abort transfer that has not been started
+bool hcd_edpt_abort_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr);
+
 // Submit a special transfer to send 8-byte Setup Packet, when complete hcd_event_xfer_complete() must be invoked
 bool hcd_setup_send(uint8_t rhport, uint8_t dev_addr, uint8_t const setup_packet[8]);
 
diff --git a/src/host/usbh.c b/src/host/usbh.c
index ecc672198..bbf333d5f 100644
--- a/src/host/usbh.c
+++ b/src/host/usbh.c
@@ -710,6 +710,19 @@ bool tuh_edpt_xfer(tuh_xfer_t* xfer)
   return true;
 }
 
+bool tuh_edpt_abort_xfer(uint8_t daddr, uint8_t ep_addr) {
+  usbh_device_t* dev = get_device(daddr);
+  TU_VERIFY(dev);
+
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  // skip if not busy
+  if (!dev->ep_status[epnum][dir].busy) return true;
+
+  return hcd_edpt_abort_xfer(dev->rhport, daddr, ep_addr);
+}
+
 //--------------------------------------------------------------------+
 // USBH API For Class Driver
 //--------------------------------------------------------------------+
@@ -741,7 +754,7 @@ void usbh_int_set(bool enabled)
 // Endpoint API
 //--------------------------------------------------------------------+
 
-// TODO has some duplication code with device, refactor later
+// Claim an endpoint for transfer
 bool usbh_edpt_claim(uint8_t dev_addr, uint8_t ep_addr)
 {
   // Note: addr0 only use tuh_control_xfer
@@ -757,7 +770,7 @@ bool usbh_edpt_claim(uint8_t dev_addr, uint8_t ep_addr)
   return true;
 }
 
-// TODO has some duplication code with device, refactor later
+// Release an claimed endpoint due to failed transfer attempt
 bool usbh_edpt_release(uint8_t dev_addr, uint8_t ep_addr)
 {
   // Note: addr0 only use tuh_control_xfer
@@ -773,7 +786,7 @@ bool usbh_edpt_release(uint8_t dev_addr, uint8_t ep_addr)
   return true;
 }
 
-// TODO has some duplication code with device, refactor later
+// Submit an transfer
 bool usbh_edpt_xfer_with_callback(uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes,
                                   tuh_xfer_cb_t complete_cb, uintptr_t user_data)
 {
@@ -840,14 +853,13 @@ bool tuh_edpt_open(uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep)
   return hcd_edpt_open(usbh_get_rhport(dev_addr), dev_addr, desc_ep);
 }
 
-bool usbh_edpt_busy(uint8_t dev_addr, uint8_t ep_addr)
-{
-  uint8_t const epnum = tu_edpt_number(ep_addr);
-  uint8_t const dir   = tu_edpt_dir(ep_addr);
-
+bool usbh_edpt_busy(uint8_t dev_addr, uint8_t ep_addr) {
   usbh_device_t* dev = get_device(dev_addr);
   TU_VERIFY(dev);
 
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
   return dev->ep_status[epnum][dir].busy;
 }
 
diff --git a/src/host/usbh.h b/src/host/usbh.h
index 0f969a46a..d765f6744 100644
--- a/src/host/usbh.h
+++ b/src/host/usbh.h
@@ -172,8 +172,11 @@ bool tuh_control_xfer(tuh_xfer_t* xfer);
 //  - sync : blocking if complete callback is NULL.
 bool tuh_edpt_xfer(tuh_xfer_t* xfer);
 
-// Open an non-control endpoint
-bool tuh_edpt_open(uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep);
+// Open a non-control endpoint
+bool tuh_edpt_open(uint8_t daddr, tusb_desc_endpoint_t const * desc_ep);
+
+// Abort a queued transfer. Note: it can only abort transfer that has not been started
+bool tuh_edpt_abort_xfer(uint8_t daddr, uint8_t ep_addr);
 
 // Set Configuration (control transfer)
 // config_num = 0 will un-configure device. Note: config_num = config_descriptor_index + 1
diff --git a/src/portable/ehci/ehci.c b/src/portable/ehci/ehci.c
index 38711e382..fd33d6cfc 100644
--- a/src/portable/ehci/ehci.c
+++ b/src/portable/ehci/ehci.c
@@ -510,6 +510,24 @@ bool hcd_edpt_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr, uint8_t *
   return true;
 }
 
+bool hcd_edpt_abort_xfer(uint8_t rhport, uint8_t dev_addr, uint8_t ep_addr) {
+  (void) rhport;
+  (void) dev_addr;
+  (void) ep_addr;
+
+  return false;
+
+//  uint8_t const epnum = tu_edpt_number(ep_addr);
+//  ehci_qhd_t* qhd;
+//
+//  // TODO ISO not supported
+//  if (epnum == 0) {
+//    qhd = qhd_control(dev_addr);
+//  }else {
+//    qhd = qhd_get_from_addr(dev_addr, ep_addr);
+//  }
+}
+
 bool hcd_edpt_clear_stall(uint8_t daddr, uint8_t ep_addr)
 {
   ehci_qhd_t *qhd = qhd_get_from_addr(daddr, ep_addr);