Weact STM32 H750 board use serial port via usb

Unlike nucleo to user serial port via usb by just enabling the uart. We have to enable VCP in weact H750 board.

	while (1) {
		/* USER CODE END WHILE */

		/* USER CODE BEGIN 3 */
//		HAL_UART_Transmit(&huart1, tx_buff, 7, 1000); <-- this not work
		CDC_Transmit_FS(tx_buff, 7);    // use this
		HAL_Delay(1000);
	}

Reference: https://blog.csdn.net/Naisu_kun/article/details/118192032