Reference → LeUart →

LeUart.begin()

Sets the data rate in bits per second (baud) for serial data transmission. For communicating with Serial Monitor, make sure to use one of the baud rates listed in the menu at the bottom right corner of its screen. You can, however, specify other rates.
 An optional second argument configures the number of data, parity, and stop bits. The default is 8 data bits, no parity, one stop bit. LeUart.begin()
LeUart.begin(speed)
LeUart.begin(speed, config)
LeUart.begin(speed, config, rx, tx) - returns error code.
LeUart.begin(speed, config, rx, tx, *buffer, len) - returns error code
 speed: in bits per second (baud). Allowed data types: long. Standart supported values are: 300, 600, 1200, 2400, 4800, 9600 bps. If omitted, default 9600 bps is used. config: sets data, parity, and stop bits. Valid values are:
  • LE_UART_SERIAL_8N1 (the default)
  • LE_UART_SERIAL_8N2
  • LE_UART_SERIAL_9N1
  • LE_UART_SERIAL_9N2
  • LE_UART_SERIAL_8E1: even parity
  • LE_UART_SERIAL_8E2
  • LE_UART_SERIAL_9E1
  • LE_UART_SERIAL_9E2
  • LE_UART_SERIAL_8O1: odd parity
  • LE_UART_SERIAL_8O2
  • LE_UART_SERIAL_9O1
  • LE_UART_SERIAL_9O2
 rx: pin RX. tx: pin TX. buffer: pointer to receiving buffer. len: size of buffer in bytes. error code. 0 means success. Simple variants of begin() method. 

	LeUart.begin(9600); // opens LeUart port on LEUART0, sets data rate to 9600 bps
Advanced variants of begin() method. 

    static uint8_t buf[256]; // Custom receiving buffer
    LeUart.begin(1200, LE_UART_SERIAL_8N1);//  Setup just a bit mode. 8 bita + 1 stopbit
    LeUart.begin(1200, LE_UART_SERIAL_8N1, 9, 10);// Define bit mode and move serial0 to pins 9/10
    LeUart.begin(1200, LE_UART_SERIAL_8N1, 9, 10, &buf[0], sizeof(buf));// Define bit mode, move serial0 to pins 9/10 and use custom receiving buffer
Complete example: 

	#include "LeUartClass.h"

	byte dimmerValue=0;
	ZUNO_SETUP_SLEEPING_MODE(ZUNO_SLEEPING_MODE_FREQUENTLY_AWAKE);
	ZUNO_SETUP_CHANNELS(ZUNO_SWITCH_MULTILEVEL(&dimmerValue,NULL));
	
	#define MY_SERIAL LeUart
	
	uint32_t loop_count = 0; // the variable that illustrates that RAM is alive during FLiRS mode too
	
	void setup(){
		MY_SERIAL.begin(1200, LE_UART_SERIAL_8N1, 8, 7);
		MY_SERIAL.wakeUp('9');
		MY_SERIAL.startFrame('0');
		MY_SERIAL.print("BOOT REASON:");
		MY_SERIAL.println(zunoGetWakeReason(), HEX);
		zunoAttachSysHandler(ZUNO_HANDLER_WUP, 0, (void*) &_wakeHandler);
		pinMode(LED_BUILTIN, OUTPUT);
	}
	
	void _wakeHandler(void){
		char c;
	
		c = LeUart.read();
		while(LeUart.available()) {
			c = LeUart.read();
			if (c != '9')
				LeUart.print(c);
		}
		LeUart.print('\n');
		
		MY_SERIAL.startFrame('0');
		MY_SERIAL.print("wake time:");
		MY_SERIAL.println(millis());
		MY_SERIAL.print("loop count =");
		MY_SERIAL.println(loop_count);
		MY_SERIAL.print("WAKEUP REASON:");
		MY_SERIAL.println(zunoGetWakeReason(), HEX);
	}
	
	void loop(){
		if (zunoIsSleepLocked()){
			// Here we do all sleep uninterruptable logic
			analogWrite(LED_BUILTIN, dimmerValue); // Apply dimmer value from controller to builtin LED
			MY_SERIAL.print("go sleep time:");
			MY_SERIAL.println(millis()); // Print moment when we are ready to go to sleep
			MY_SERIAL.print("loop count =");
			MY_SERIAL.println(loop_count);
			zunoSendDeviceToSleep(); // We don't need parameter for FLiRS here, Z-Uno will ingore parameter anyway
		}
		
		// Here you can do something that could be interrupted by sleep mode
		loop_count++; // Increment variable
		delay(1000);
		MY_SERIAL.println("Loop");
	}