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#! /usr/bin/env python3
from libserial import SerialPort
from time import sleep
import optparse
import logging
def create_options_parser():
"""Create a parser to extract value from command line options."""
parser = optparse.OptionParser( usage = "%prog [opts]" )
parser.add_option( "-d", "--device",
action = "store",
type = "string",
help = "Serial port device",
default = "/dev/ttyS0" )
return parser
def main():
#
# Parse the command line options specified by the user.
#
parser = create_options_parser()
(options, arguments) = parser.parse_args()
#
logging.info( "Opening serial port " + options.device )
serial_port = SerialPort( options.device )
serial_port.Open( SerialPort.BAUD_DEFAULT,
SerialPort.CHAR_SIZE_DEFAULT,
SerialPort.PARITY_DEFAULT,
SerialPort.STOP_BITS_DEFAULT,
SerialPort.FLOW_CONTROL_NONE )
while True:
#
serial_port.SetRts( True )
serial_port.SetDtr( False )
#
assert ( True == serial_port.GetRts() )
assert ( False == serial_port.GetDtr() )
#
sleep(1)
#
serial_port.SetRts( False )
serial_port.SetDtr( True )
#
assert ( False == serial_port.GetRts() )
assert ( True == serial_port.GetDtr() )
#
sleep(1)
###############################################################################
# The script starts here.
###############################################################################
if __name__ == "__main__":
try:
logging.basicConfig( level = logging.DEBUG,
format = '%(asctime)s %(levelname)s %(message)s' )
main()
except SystemExit:
raise
except:
print \
"""An internal error occured. Please report all the output from the program,
including the following traceback.
"""
raise
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