1 files changed, 42 insertions, 0 deletions
diff --git a/app/usb.c b/app/usb.c
index 9d8c6f8..b03eb9c 100644
--- a/app/usb.c
+++ b/app/usb.c
@@ -59,6 +59,45 @@ static const char *usb_strings[] = {
 
 usbd_device *usbd_dev;
 
+int usb_is_suspended = 1;
+
+
+static void
+usb_suspended (void)
+{
+  *USB_CNTR_REG |= USB_CNTR_FSUSP;
+
+  usb_is_suspended = 1;
+}
+
+static void
+usb_resumed (void)
+{
+
+  *USB_CNTR_REG &= ~USB_CNTR_FSUSP;
+
+  usb_is_suspended = 0;
+}
+
+int
+usb_wakeup_host (void)
+{
+  if (!usb_is_suspended)
+    return 1;
+
+
+  *USB_CNTR_REG |= USB_CNTR_RESUME;
+
+  delay_us (1000);
+  delay_us (1000);
+  delay_us (1000);
+  delay_us (1000);
+  delay_us (1000);
+
+  *USB_CNTR_REG &= ~USB_CNTR_RESUME;
+
+  return 0;
+}
 
 static int
 usb_control_class_request (usbd_device * usbd_dev, struct usb_setup_data *req,
@@ -139,6 +178,9 @@ usb_init (void)
 
   usbd_register_set_config_callback (usbd_dev, usb_set_config);
 
+  usbd_register_suspend_callback (usbd_dev, usb_suspended);
+  usbd_register_resume_callback (usbd_dev, usb_resumed);
+
 }
 
 void