Allow reinitializing USB

usb.c

@@ -314,15 +314,19 @@ void usb_setup() {
   }
 
   /* Initialize the device... */
+  usb_reinit();
+
+  /* And use interrupts instead of polling. */
+  // nvic_enable_irq(NVIC_OTG_FS_IRQ);
+}
+
+void usb_reinit() {
   g_usbd_dev = usbd_init(&otgfs_usb_driver, &dev, &config,
                          (char const * const *)usb_strings,
                          (sizeof usb_strings) / sizeof(usb_strings[0]),
                          usbd_control_buffer, sizeof(usbd_control_buffer));
 
   usbd_register_set_config_callback(g_usbd_dev, cdcacm_set_config);
-
-  /* And use interrupts instead of polling. */
-  // nvic_enable_irq(NVIC_OTG_FS_IRQ);
 }
 
 //void __attribute__((weak)) otg_fs_isr() { }

usb.h

@@ -6,6 +6,7 @@
 extern usbd_device *g_usbd_dev;
 
 void usb_setup(void);
+void usb_reinit(void);
 int usb_write_cdcacm(uint8_t acm, void *data, size_t len, int tries);
 
 #define ACM_NFC 1