2 files changed, 20 insertions, 0 deletions
diff --git a/stmhal/usbdev/class/inc/usbd_cdc_msc_hid.h b/stmhal/usbdev/class/inc/usbd_cdc_msc_hid.h
index 7cb64fd84..5f0502766 100644
--- a/stmhal/usbdev/class/inc/usbd_cdc_msc_hid.h
+++ b/stmhal/usbdev/class/inc/usbd_cdc_msc_hid.h
@@ -116,5 +116,7 @@ uint8_t USBD_HID_SetRxBuffer(USBD_HandleTypeDef *pdev, uint8_t *pbuff);
 uint8_t USBD_HID_ReceivePacket(USBD_HandleTypeDef *pdev);
 int USBD_HID_CanSendReport(USBD_HandleTypeDef *pdev);
 uint8_t USBD_HID_SendReport(USBD_HandleTypeDef *pdev, uint8_t *report, uint16_t len);
+uint8_t USBD_HID_SetNAK(USBD_HandleTypeDef *pdev);
+uint8_t USBD_HID_ClearNAK(USBD_HandleTypeDef *pdev);
 
 #endif // _USB_CDC_MSC_CORE_H_
diff --git a/stmhal/usbdev/class/src/usbd_cdc_msc_hid.c b/stmhal/usbdev/class/src/usbd_cdc_msc_hid.c
index 3ebc7d828..cfae7224d 100644
--- a/stmhal/usbdev/class/src/usbd_cdc_msc_hid.c
+++ b/stmhal/usbdev/class/src/usbd_cdc_msc_hid.c
@@ -1093,6 +1093,24 @@ uint8_t USBD_HID_SendReport(USBD_HandleTypeDef *pdev, uint8_t *report, uint16_t
     return USBD_OK;
 }
 
+uint8_t USBD_HID_SetNAK(USBD_HandleTypeDef *pdev) {
+    // get USBx object from pdev (needed for USBx_OUTEP macro below)
+    PCD_HandleTypeDef *hpcd = pdev->pData;
+    USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
+    // set NAK on HID OUT endpoint
+    USBx_OUTEP(HID_OUT_EP_WITH_CDC)->DOEPCTL |= USB_OTG_DOEPCTL_SNAK;
+    return USBD_OK;
+}
+
+uint8_t USBD_HID_ClearNAK(USBD_HandleTypeDef *pdev) {
+    // get USBx object from pdev (needed for USBx_OUTEP macro below)
+    PCD_HandleTypeDef *hpcd = pdev->pData;
+    USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
+    // clear NAK on HID OUT endpoint
+    USBx_OUTEP(HID_OUT_EP_WITH_CDC)->DOEPCTL |= USB_OTG_DOEPCTL_CNAK;
+    return USBD_OK;
+}
+
 // CDC/MSC/HID interface class callback structure
 USBD_ClassTypeDef USBD_CDC_MSC_HID = {
     USBD_CDC_MSC_HID_Init,