Print Information About All Channels

#list_channels.py -- List all CANlib channel
#This script uses canlib.canlib to list all CANlib channels and information
#about the device that is using them.
import argparse

from canlib import canlib


def print_channels():
    for ch in range(canlib.getNumberOfChannels()):
        chdata = canlib.ChannelData(ch)
        print("{ch}. {name} ({ean} / {serial})".format(
            ch=ch,
            name=chdata.device_name,
            ean=chdata.card_upc_no,
            serial=chdata.card_serial_no,
        ))


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description="List all CANlib channels and information about them.")
    args = parser.parse_args()

    print_channels()
   #

sampe output：

0. Kvaser Leaf Light v2 (channel 0) (73-30130-00685-0 / 41683)
1. Kvaser Virtual CAN Driver (channel 0) (00-00000-00000-0 / 0)
2. Kvaser Virtual CAN Driver (channel 1) (00-00000-00000-0 / 0)

Send and receive single frame

from canlib import canlib, Frame
from canlib.canlib import ChannelData


def setUpChannel(channel=0,
              openFlags=canlib.Open.ACCEPT_VIRTUAL,
              bitrate=canlib.canBITRATE_500K,
              outputControl=canlib.Driver.NORMAL):
 ch = canlib.openChannel(channel, openFlags)
 print("Using channel: %s, EAN: %s" % (ChannelData(channel).device_name,
                                       ChannelData(channel).card_upc_no))
 ch.setBusOutputControl(outputControl)
 ch.setBusParams(bitrate)
 ch.busOn()
 return ch


def tearDownChannel(ch):
 ch.busOff()
 ch.close()


print("canlib version:", canlib.dllversion())

ch0 = setUpChannel(channel=0)
ch1 = setUpChannel(channel=1)

frame = Frame(id_=100, data=[1, 2, 3, 4], flags=canlib.MessageFlag.EXT)
ch1.write(frame)

while True:
 try:
     frame = ch0.read()
     print(frame)
     break
 except (canlib.canNoMsg) as ex:
     pass
 except (canlib.canError) as ex:
     print(ex)

tearDownChannel(ch0)
tearDownChannel(ch1)

sample output:

Using channel: Kvaser Leaf Light v2 (channel 0), EAN: 73-30130-00685-0
Using channel: Kvaser Virtual CAN Driver (channel 0), EAN: 00-00000-00000-0
Frame(id=217056256, data=bytearray(b’\x00\x00\x00\x00\x00\x00\x00\x00’), dlc=8L, flags=<MessageFlag.EXT: 4>, timestamp=7L)