ioport_set_pin_dir(HART_DSBL_PIN, IOPORT_DIR_OUTPUT);
	//ioport_set_pin_mode(PIN_PA21, IOPORT_MODE_PULLUP);
	ioport_set_pin_level(HART_DSBL_PIN, false);

	static uint32_t ul_sysclk;


	usart_serial_options_t usart_options = {
		.baudrate = 1200,//mb_speed/*HoldingRegister[1]*/,
		.charlength = USART_SERIAL_CHAR_LENGTH,
		.paritytype = USART_SERIAL_PARITY,
		.stopbits = USART_SERIAL_STOP_BIT

	};

	ul_sysclk = sysclk_get_cpu_hz();

	/* Enable peripheral clock. */
	sysclk_enable_peripheral_clock(BOARD_ID_USART);


	ioport_enable_pin(COM_PORT_RX_PIN);
	ioport_enable_pin(COM_PORT_TX_PIN);
	//ioport_enable_pin(COM_PORT_RTS_PIN);

	ioport_set_pin_mode(COM_PORT_RX_PIN, COM_PORT_RX_MUX);
	ioport_disable_pin(COM_PORT_RX_PIN);

	//ioport_set_pin_mode(COM_PORT_RTS_PIN, COM_PORT_RTS_MUX);
	//ioport_disable_pin(COM_PORT_RTS_PIN);

	ioport_set_pin_mode(COM_PORT_TX_PIN, COM_PORT_TX_MUX);
	ioport_disable_pin(COM_PORT_TX_PIN);

	usart_serial_init(USART_USED, &usart_options);
	//USART_USED ->US_MR|=1;
	USART_USED->US_MR |= US_MR_NBSTOP_2_BIT;

	//usart_set_rx_timeout(USART_USED, 35);
	usart_disable_interrupt(USART_USED, 0xFFFFFFFF);
	usart_enable_interrupt(USART_USED, US_USART_IER_RXRDY);
	//usart_enable_interrupt(USART_USED, US_USART_IER_TIMEOUT);
	usart_enable_interrupt(USART_USED, US_USART_IER_TXEMPTY);

	NVIC_SetPriority(USART1_IRQn, 2);
	usart_enable_tx(USART_USED);
	usart_enable_rx(USART_USED);
	NVIC_EnableIRQ(USART0_IRQn);