diff --git a/os/hal/include/hal_usbh.h b/os/hal/include/hal_usbh.h
index 1ed6416a..6a6be21c 100644
--- a/os/hal/include/hal_usbh.h
+++ b/os/hal/include/hal_usbh.h
@@ -52,7 +52,9 @@
 #define HAL_USBH_USE_ADDITIONAL_CLASS_DRIVERS	FALSE
 #endif
 
+#ifndef HAL_USBH_USE_IAD
 #define HAL_USBH_USE_IAD     HAL_USBH_USE_UVC
+#endif
 
 #if (HAL_USE_USBH == TRUE) || defined(__DOXYGEN__)
 
@@ -299,6 +301,12 @@ extern "C" {
 	}
 
 	/* Synchronous API */
+	usbh_urbstatus_t usbhSynchronousTransfer(usbh_ep_t *ep,
+			void *data,
+			uint32_t len,
+			uint32_t *actual_len,
+			systime_t timeout);
+
 	usbh_urbstatus_t usbhBulkTransfer(usbh_ep_t *ep,
 			void *data,
 			uint32_t len,
diff --git a/os/hal/ports/STM32/LLD/USBHv1/hal_usbh_lld.c b/os/hal/ports/STM32/LLD/USBHv1/hal_usbh_lld.c
index 47235080..0403eae1 100644
--- a/os/hal/ports/STM32/LLD/USBHv1/hal_usbh_lld.c
+++ b/os/hal/ports/STM32/LLD/USBHv1/hal_usbh_lld.c
@@ -1172,9 +1172,17 @@ static inline void _nptxfe_int(USBHDriver *host) {
 }
 
 static inline void _ptxfe_int(USBHDriver *host) {
-	//TODO: implement
-	(void)host;
-	uinfo("PTXFE");
+	uint32_t rem;
+	stm32_otg_t *const otg = host->otg;
+
+	rem = _write_packet(&host->ep_active_lists[USBH_EPTYPE_ISO],
+			otg->HPTXSTS & HPTXSTS_PTXFSAVL_MASK);
+
+	rem += _write_packet(&host->ep_active_lists[USBH_EPTYPE_INT],
+			otg->HPTXSTS & HPTXSTS_PTXFSAVL_MASK);
+
+	if (!rem)
+		otg->GINTMSK &= ~GINTMSK_PTXFEM;
 }
 
 static void _disable(USBHDriver *host) {
diff --git a/os/hal/src/hal_usbh.c b/os/hal/src/hal_usbh.c
index 7dff98a4..3949c68a 100644
--- a/os/hal/src/hal_usbh.c
+++ b/os/hal/src/hal_usbh.c
@@ -335,10 +335,19 @@ usbh_urbstatus_t usbhBulkTransfer(usbh_ep_t *ep,
 		uint32_t len,
 		uint32_t *actual_len,
 		systime_t timeout) {
+	osalDbgAssert(ep->type == USBH_EPTYPE_BULK, "wrong ep");
+
+	return usbhSynchronousTransfer(ep,data,len,actual_len,timeout);
+}
+
+usbh_urbstatus_t usbhSynchronousTransfer(usbh_ep_t *ep,
+		void *data,
+		uint32_t len,
+		uint32_t *actual_len,
+		systime_t timeout) {
 
 	osalDbgCheck(ep != NULL);
 	osalDbgCheck((data != NULL) || (len == 0));
-	osalDbgAssert(ep->type == USBH_EPTYPE_BULK, "wrong ep");
 
 	usbh_urb_t urb;
 	usbhURBObjectInit(&urb, ep, 0, 0, data, len);