client/cros/cellular/scpi_shell

#!/usr/bin/python2
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Interact with a SCPI device, checking for errors each time."""

import cellular_system_error
import logging
import prologix_scpi_driver
import scpi
import sys

try:
    [target] = sys.argv[1:]
except ValueError:
    print 'usage: %s gpib_host_name' % sys.argv[0]
    # Default to the PXT.
    target = '172.22.50.244'

logging.basicConfig(level=logging.INFO)

driver = prologix_scpi_driver.PrologixScpiDriver(hostname=target,
                                                 port=1234,
                                                 read_timeout_seconds=1)
s = scpi.Scpi(driver)
s.opc_on_stanza = False

while True:
    try:
        line = raw_input('scpi> ').rstrip()
    except EOFError:
        print
        exit(0)

    try:
        if line[-1:] == '?':
            try:
                s.Query(line)
            #  Catch everything, we always want to try to recover.
            except Exception:
                print "**************"
                print "Query did not result in any data before the timeout"
                print "**************"
        else:
            try:
                s.SendStanza([line])
            #  Catch everything, we always want to try to recover.
            except Exception as e:
                print "**************"
                print "Command failed"
                print "**************"

    except cellular_system_error:
        continue