Serial.begin()

[Serial]

Description

Sets the data rate in bits per second (baud) for serial data transmission. For communicating with the computer, use one of these rates: 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200. You can, however, specify other rates – for example, to communicate over pins 0 and 1 with a component that requires a particular baud rate. The maximum baud rate supported by 86Duino is 6000000 (6Mbps).

An optional second argument configures the data, parity, and stop bits. The default is 8 data bits, no parity, one stop bit.

And an optional third argument selects the full-duplex and half-duplex modes. The default is the full-duplex mode.

Syntax

All boards:

• Serial.begin(speed)
• Serial1.begin(speed)
• Serial.begin(speed, config)
• Serial1.begin(speed, config)
• Serial1.begin(speed, mode)
• Serial1.begin(speed, config, mode)

86Duino One specific:

• Serial2.begin(speed)
• Serial3.begin(speed)
• Serial485.begin(speed)
• Serial2.begin(speed, config)
• Serial3.begin(speed, config)
• Serial485.begin(speed, config)
• Serial2.begin(speed, mode)
• Serial3.begin(speed, mode)
• Serial2.begin(speed, config, mode)
• Serial3.begin(speed, config, mode)

86Duino EduCake specific:

• Serial2.begin(speed)
• Serial3.begin(speed)
• Serial232.begin(speed)
• Serial2.begin(speed, config)
• Serial3.begin(speed, config)
• Serial232.begin(speed, config)
• Serial2.begin(speed, mode)
• Serial3.begin(speed, mode)
• Serial2.begin(speed, config, mode)
• Serial3.begin(speed, config, mode)

Parameters

speed: in bits per second (baud) – long. Valid values are:

• 50
• 300
• 600
• 1200
• 2400
• 4800
• 9600
• 14400
• 19200
• 28800
• 38400
• 57600
• 115200
• 125000
• 150000
• 200000
• 250000
• 300000
• 500000
• 750000
• 1000000
• 1500000
• 2000000
• 3000000
• 6000000

config: sets data, parity, and stop bits. Valid values are:

• SERIAL_5N1
• SERIAL_6N1
• SERIAL_7N1
• SERIAL_8N1 (the default)
• SERIAL_5N2
• SERIAL_6N2
• SERIAL_7N2
• SERIAL_8N2
• SERIAL_5E1
• SERIAL_6E1
• SERIAL_7E1
• SERIAL_8E1
• SERIAL_5E2
• SERIAL_6E2
• SERIAL_7E2
• SERIAL_8E2
• SERIAL_5O1
• SERIAL_6O1
• SERIAL_7O1
• SERIAL_8O1
• SERIAL_5O2
• SERIAL_6O2
• SERIAL_7O2
• SERIAL_8O2

mode: sets the full-duplex and half-duplex modes. Valid values are:

• COM_FullDuplex (the default)
• COM_HalfDuplex

Returns

nothing

Example

void setup() {
    Serial1.begin(9600); // opens serial port, sets data rate to 9600 bps
}
 
void loop() {}

86Duino One/EduCake example:

// Using Serial1, Serial2, Serial3 with different baud rates:
 
void setup(){
  Serial1.begin(38400);
  Serial2.begin(19200);
  Serial3.begin(4800);
 
  Serial1.println("Hello Serial 1");
  Serial2.println("Hello Serial 2");
  Serial3.println("Hello Serial 3");
}
 
void loop() {}

See also

• if (Serial)
• available()
• end()
• find()
• findUntil()
• flush()
• parseFloat()
• parseInt()
• peek()
• print()
• println()
• read()
• readBytes()
• readBytesUntil()
• setTimeout()
• write()
• serialEvent()

Language Reference Home

The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.