From aa9a7e882c8eb0f5fb46be5cd84ffd98cb3cfb9c Mon Sep 17 00:00:00 2001
From: "William D. Jones" <thor0505@comcast.net>
Date: Wed, 23 Jan 2019 00:55:45 -0500
Subject: [PATCH] stm32f4: Properly set control endpoint max packet size.

---
 src/portable/stm/stm32f4/dcd_stm32f4.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/portable/stm/stm32f4/dcd_stm32f4.c b/src/portable/stm/stm32f4/dcd_stm32f4.c
index 4adb52a7..53e0868a 100644
--- a/src/portable/stm/stm32f4/dcd_stm32f4.c
+++ b/src/portable/stm/stm32f4/dcd_stm32f4.c
@@ -104,7 +104,13 @@ static void end_of_reset(void) {
 
   // Maximum packet size for EP 0 is set for both directions by writing
   // DIEPCTL.
-  in_ep[0].DIEPCTL |= enum_spd;
+  if(enum_spd == 0x03) {
+    // 64 bytes
+    in_ep[0].DIEPCTL &= ~(0x03 << USB_OTG_DIEPCTL_MPSIZ_Pos);
+  } else {
+    // 8 bytes
+    in_ep[0].DIEPCTL |= (0x03 << USB_OTG_DIEPCTL_MPSIZ_Pos);
+  }
   xfer_status[0][TUSB_DIR_OUT].max_size = 64;
   xfer_status[0][TUSB_DIR_IN].max_size = 64;
 }