Refactor code structure for improved readability and maintainability

Core/Src/usart.c

@@ -39,7 +39,7 @@ void MX_USART1_UART_Init(void)
 
   /* USER CODE END USART1_Init 1 */
   huart1.Instance = USART1;
-  huart1.Init.BaudRate = 115200;
+  huart1.Init.BaudRate = 9600;
   huart1.Init.WordLength = UART_WORDLENGTH_8B;
   huart1.Init.StopBits = UART_STOPBITS_1;
   huart1.Init.Parity = UART_PARITY_NONE;