From ba3fceeb8703a68aefef01a00042b5aa07e4b9a7 Mon Sep 17 00:00:00 2001
From: sakumisu <1203593632@qq.com>
Date: Thu, 17 Feb 2022 13:32:53 +0800
Subject: fix ep0 zlp send judgement

---
 core/usbd_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/usbd_core.c b/core/usbd_core.c
index 6e88ecdb..ce4e4abc 100644
--- a/core/usbd_core.c
+++ b/core/usbd_core.c
@@ -982,7 +982,7 @@ static void usbd_send_to_host(uint16_t len)
          * last chunk is wMaxPacketSize long, to indicate the last
          * packet.
          */
-        if ((!usbd_core_cfg.ep0_data_buf_residue) && (usbd_core_cfg.ep0_data_buf_len >= USB_CTRL_EP_MPS) && !(usbd_core_cfg.ep0_data_buf_len % USB_CTRL_EP_MPS)) {
+        if(!usbd_core_cfg.ep0_data_buf_residue && (len > usbd_core_cfg.ep0_data_buf_len) && !(usbd_core_cfg.ep0_data_buf_len % USB_CTRL_EP_MPS)){
             /* Transfers a zero-length packet next*/
             usbd_core_cfg.zlp_flag = true;
         }
-- 
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