Il y avait des problèmes dans la libraire...

Fork of USBDEVICE by ST

Revision:
2:760da2befbf5
Parent:
1:2a3ae13b45ef
--- a/USBDevice/TARGET_STM/USBHAL_STM32L476VG.h	Thu Dec 15 17:40:59 2016 +0100
+++ b/USBDevice/TARGET_STM/USBHAL_STM32L476VG.h	Fri Dec 16 15:12:14 2016 +0000
@@ -121,7 +121,7 @@
     __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
 
     hpcd.State = HAL_PCD_STATE_RESET;
-
+    hpcd.Lock = HAL_UNLOCKED;
     HAL_PCD_Init(&hpcd);
     /* 1.25kbytes */
     /* min value 16 (= 16 x 4 bytes) */