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UART.md

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Platform Support

The following shows uart module APIs available for each platform.

Linux
(Ubuntu)		 Raspbian
(Raspberry Pi)		 NuttX
(STM32F4-Discovery)		 TizenRT
(Artik053)
uart.open O O O O
uartport.write O O O O
uartport.writeSync O O O O
uartport.close O O X O
uartport.closeSync O O X O

Class: UART

The UART (Universal Asynchronous Receiver/Transmitter) class supports asynchronous serial communication.

new UART()

Returns with a new UART object.

uart.open(configuration[, callback])

  • configuration {Object}
    • device {string} Mandatory configuration.
    • baudRate {number} Specifies how fast data is sent over a serial line. Default: 9600.
    • dataBits {number} Number of data bits that are being transmitted. Default: 8.
  • callback {Function}.
    • err {Error|null}.
  • Returns: {UARTPort}.

Opens an UARTPort object with the specified configuration.

The baudRate must be equal to one of these values: [0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400].

The dataBits must be equal to one of these values: [5, 6, 7, 8].

On NuttX, you also need to set the properties of the configuration in the NuttX configuration file. Using the NuttX menuconfig, it can be found at the Device Drivers -> Serial Driver Support -> U[S]ART(N) Configuration section.

You can read more information about the usage of the UART on stm32f4-discovery board: STM32F4-discovery.

Example

var Uart = require('uart');

var uart = new Uart();
var configuration = {
  device: '/dev/ttyUSB0'
  baudRate: 115200,
  dataBits: 8,
}

var serial = uart.open(configuration, function(err) {
  // Do something.
});

Class: UARTPort

The UARTPort class is responsible for transmitting and receiving serial data.

uartport.write(data[, callback]).

  • data {string}.
  • callback {Function}.
    • err {Error|null}.

Writes the given data to the UART device asynchronously.

Example

serial.write('Hello?', function(err) {
  if (err) {
    // Do something.
  }
  serial.close();
});

uartport.writeSync(data)

  • data {string}.

Writes the given data to the UART device synchronously.

Example

serial.writeSync('Hello?');

serial.close();

uartport.close([callback])

  • callback {Function}.
    • err {Error|null)}.

Closes the UART device asynchronously.

On NuttX/STM32F4Discovery, Uart.close() blocks after close(). It seems that poll() does not work properly on NuttX for some cases.

uartport.closeSync()

Closes the UART device synchronously.

On NuttX/STM32F4Discovery, Uart.close() blocks after close(). It seems that poll() does not work properly on NuttX for some cases.

Event: 'data'

  • callback {Function}
    • data {string} A string from the sender.

Example

/* ... */

serial.on('data', function(data) {
  console.log('read result: ' + data.toString());
});