Saleae Logic 2 Automation in Python - working with UART.

saleae.py

# pip install pyserial==3.5 logic2-automation==1.0.6
from saleae import automation
import serial
import time


# Make sure that this is accessible to your Linux user. It probably isn't.
# Run `sudo chmod a+rw /dev/ttyUSB1` to allow everyone on the machine access.
tty = serial.Serial('/dev/ttyUSB1') # UART over USB


# Remember to enable "Automation" in Logic 2 software.
# Preferences > Enable Automation Server ([Ctrl+,] opens preferences)
# 10430 is the default port Logic 2 listens on when this is activated
manager = automation.Manager.connect(port=10430)


# device_id can be left out, or be set to the serial number of your logic analyzer.
# manager.start_capture(...) is non-blocking, and starts the capture in the background.
capture = manager.start_capture(
    device_id='0000000000000000',
    device_configuration=automation.LogicDeviceConfiguration(
        enabled_digital_channels=[0,1,2,3],
        enabled_analog_channels=[0,1,2,3],
        digital_sample_rate=500_000_000,
        analog_sample_rate=12_500_000,
        digital_threshold_volts=3.3,
    ),
    capture_configuration=automation.CaptureConfiguration(
        capture_mode=automation.TimedCaptureMode(duration_seconds=1.0)
    )
)


# You can now do whatever you want for the duration of the capture
# and run any kind of tests your desire
time.sleep(0.5)
tty.write(b'Hello world')


# Analyzers can be added after capture/tests have finished, as you don't want
# adding them to affect the timing of your tests.
# This will helpfully show our decoded UART-data as labels over the waveform
capture.add_analyzer(label='UART RX',
                     name='Async Serial',
                     settings={'Input Channel': 2,
                               'Bit Rate (Bits/s)': 9600,
                               'Bits per Frame': 8,
                               'Stop Bits': 1})