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A Nim library for accessing serial ports.
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mp035 and euantorano Linux baud fix (#19)
* applied fix which should work for both osx and linux.

* Removed vim swp file.
Latest commit b2d2e64 Dec 19, 2018
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src Linux baud fix (#19) Dec 19, 2018
.editorconfig Major refactor, improving Windows support and adding SerialStream Aug 15, 2017
LICENSE Major refactor, improving Windows support and adding SerialStream Aug 15, 2017


A library to work with serial ports using pure Nim.


serial can be installed using Nimble:

nimble install serial

Or add the following to your .nimble file:

# Dependencies

requires "serial >= 1.0.0"

API Documentation


There are two examples in the examples directory, showing reading from and writing to a serialport.

Listing serial ports

import serial # Or: `import serial/utils`

for port in listSerialPorts():
  echo port

Reading from/writing to a serial port (echoing data)

import serial # Or: `import serial/serialport`

let port = newSerialPort("COM1")
# use 9600bps, no parity, 8 data bits and 1 stop bit, Parity.None, 8, StopBits.One)

# You can modify the baud rate, parity, databits, etc. after opening the port
port.baudRate = 2400

var receiveBuffer = newString(1024)
while true:
  let numReceived =
  discard port.write(receiveBuffer[0 ..< numReceived])

Using the SerialStream

import serial # Or: `import serial/serialstream`

let port = newSerialStream("COM1", 9600, Parity.None, 8, StopBits.One, buffered=true)

while true:
  # Read a line from the serial port then write it back.


  • Basic port reading/writing for Windows/Posix
  • Port setting control - baud rate, stop bits, databits, parity, handshaking
  • Port listing to list available serial ports
    • Windows, using SetupDiGetClassDevs
    • Mac, using I/O Kit
    • Posix, by iteratng possible device files
  • High level SerialPortStream that complies with the streams API
  • Async API using asyncdispatch for reading from and writing to a port
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