Interactive Serial

Serial communication is a key part of modern embedded systems UI and debugging. It is a simple way to enable interaction with the DUT as well as a low cost way to log data.

The Lager setup includes designating lines for use with a serial terminal. This can include either raw UART TX and RX lines, or a USB connection in the case that the DUT supports USB CDC.

Lager supports pyserial natively so getting started with interactive serial is very straightforward.

using_pyserial_with_dut.py

 import serial

 s = serial.Serial('/dev/ttyUSB1', 115200, timeout=60)
 line = s.readline()
 s.write(b'hello')

Serial terminal

A serial terminal is also supported. You can either open an interactive terminal with the DUT, which is very useful when the DUT supports a CLI, or you can open a simplex connection which only accepts data from the DUT.

Open Interactive Serial Connection To Dut

~  lager serial-ports --dut 1
/dev/ttyUSB1

~  lager uart serial-device /dev/ttyUSB1 --interactive --dut 1

The default baud is 115200 but you have the ability to set most common UART parameters.