Start clock on F0 and F0, and handle USB interrupts.

hw/bsp/stm32f070rbnucleo/stm32f070rbnucleo.c

@@ -91,6 +91,14 @@ void board_init(void)
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
   HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);
 
+  // Start USB clock
+  __HAL_RCC_USB_CLK_ENABLE();
+}
+
+void dcd_fs_irqHandler(void);
+void USB_IRQHandler(void)
+{
+	dcd_fs_irqHandler();
 }
 
 //--------------------------------------------------------------------+