1.0 worked version

Core/Inc/stm32l4xx_it.h

@@ -57,6 +57,7 @@ void PendSV_Handler(void);
 void SysTick_Handler(void);
 void DMA1_Channel4_IRQHandler(void);
 void SPI1_IRQHandler(void);
+void USART1_IRQHandler(void);
 /* USER CODE BEGIN EFP */
 
 /* USER CODE END EFP */