stm32f1: fix h103 usbdfu example

This has been broken since f87170e when set config started clearing control
handlers to be re-registered by different configurations.

Fix this example to use a set config callback to setup control transfer
callbacks, just like CDC-ACM demos.  With this fix, this demo works with
dfu-tool 0.8

Signed-off-by: Karl Palsson <[email protected]>

Author: Jan

examples/stm32/f1/stm32-h103/usb_dfu/usbdfu.c

@@ -229,6 +229,17 @@ static int usbdfu_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 	return 0;
 }
 
+static void usbdfu_set_config(usbd_device *usbd_dev, uint16_t wValue)
+{
+	(void)wValue;
+
+	usbd_register_control_callback(
+				usbd_dev,
+				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
+				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+				usbdfu_control_request);
+}
+
 int main(void)
 {
 	usbd_device *usbd_dev;
@@ -257,11 +268,7 @@ int main(void)
 	gpio_set(GPIOC, GPIO11);
 
 	usbd_dev = usbd_init(&stm32f103_usb_driver, &dev, &config, usb_strings, 4, usbd_control_buffer, sizeof(usbd_control_buffer));
-	usbd_register_control_callback(
-				usbd_dev,
-				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
-				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
-				usbdfu_control_request);
+	usbd_register_set_config_callback(usbd_dev, usbdfu_set_config);
 
 	gpio_clear(GPIOC, GPIO11);