Goes through channel list and returns digital channels with ids
    Dev1/port0/line08, Dev1/port0/line09... Dev1/port0/line30.

def get_digital_channels(channel_list):
    """Goes through channel list and returns digital channels with ids
    Dev1/port0/line08, Dev1/port0/line09... Dev1/port0/line30."""
    dig_ids = digital_channel_ids()
    dig_channels = []
    for ln in dig_ids:
        for ch in channel_list:
            if ch.dct['id'] == ln:
                dig_channels.append(ch)
                break
    return dig_channels