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# Copyright 2017 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Utilities for using lightweight console functions."""
# Note: This is a py2/3 compatible file.
import datetime
import sys
import time
import six
import usb # pylint:disable=import-error
from . import pty_driver, stm32uart
def get_subprocess_args():
if six.PY3:
return {"encoding": "utf-8"}
return {}
class TinyServoError(Exception):
"""Exceptions."""
def log(output):
"""Print output to console, logfiles can be added here.
Args:
output: string to output.
"""
sys.stdout.write(output)
sys.stdout.write("\n")
sys.stdout.flush()
def check_usb(vidpid, serialname=None):
"""Check if |vidpid| is present on the system's USB.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
serialname: serialname if specified.
Returns:
True if found, False, otherwise.
"""
if get_usb_dev(vidpid, serialname):
return True
return False
def check_usb_sn(vidpid):
"""Return the serial number
Return the serial number of the first USB device with VID:PID vidpid,
or None if no device is found. This will not work well with two of
the same device attached.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
Returns:
string serial number if found, None otherwise.
"""
dev = get_usb_dev(vidpid)
if dev:
dev_serial = usb.util.get_string(dev, dev.iSerialNumber)
return dev_serial
return None
def get_usb_dev(vidpid, serialname=None):
"""Return the USB pyusb devie struct
Return the dev struct of the first USB device with VID:PID vidpid,
or None if no device is found. If more than one device check serial
if supplied.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
serialname: serialname if specified.
Returns:
pyusb device if found, None otherwise.
"""
vidpidst = vidpid.split(":")
vid = int(vidpidst[0], 16)
pid = int(vidpidst[1], 16)
dev_g = usb.core.find(idVendor=vid, idProduct=pid, find_all=True)
dev_list = list(dev_g)
if not dev_list:
return None
# Check if we have multiple devices and we've specified the serial.
dev = None
if serialname:
for d in dev_list:
dev_serial = usb.util.get_string(d, d.iSerialNumber)
if dev_serial == serialname:
dev = d
break
if dev is None:
return None
else:
try:
dev = dev_list[0]
except StopIteration:
return None
return dev
def check_usb_dev(vidpid, serialname=None):
"""Return the USB dev number
Return the dev number of the first USB device with VID:PID vidpid,
or None if no device is found. If more than one device check serial
if supplied.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
serialname: serialname if specified.
Returns:
usb device number if found, None otherwise.
"""
dev = get_usb_dev(vidpid, serialname=serialname)
if dev:
return dev.address
return None
def wait_for_usb_remove(vidpid, serialname=None, timeout=None):
"""Wait for USB device with vidpid to be removed.
Wrapper for wait_for_usb below
"""
wait_for_usb(
vidpid, serialname=serialname, timeout=timeout, desiredpresence=False
)
def wait_for_usb(vidpid, serialname=None, timeout=None, desiredpresence=True):
"""Wait for usb device with vidpid to be present/absent.
Args:
vidpid: string representation of the usb vid:pid, eg. '18d1:2001'
serialname: serialname if specificed.
timeout: timeout in seconds, None for no timeout.
desiredpresence: True for present, False for not present.
Raises:
TinyServoError: on timeout.
"""
if timeout:
finish = datetime.datetime.now() + datetime.timedelta(seconds=timeout)
while check_usb(vidpid, serialname) != desiredpresence:
time.sleep(0.1)
if timeout:
if datetime.datetime.now() > finish:
raise TinyServoError(
"Timeout", "Timeout waiting for USB %s" % vidpid
)
def do_serialno(serialno, pty):
"""Set serialnumber 'serialno' via ec console 'pty'.
Commands are:
# > serialno set 1234
# Saving serial number
# Serial number: 1234
Args:
serialno: string serial number to set.
pty: tinyservo console to send commands.
Raises:
TinyServoError: on failure to set.
ptyError: on command interface error.
"""
cmd = r"serialno set %s" % serialno
regex = r"Serial number:\s+(\S+)"
results = pty._issue_cmd_get_results(cmd, [regex])[0]
sn = results[1].strip().strip("\n\r")
if sn == serialno:
log("Success !")
log("Serial set to %s" % sn)
else:
log("Serial number set to %s but saved as %s." % (serialno, sn))
raise TinyServoError(
"Serial Number",
"Serial number set to %s but saved as %s." % (serialno, sn),
)
def setup_tinyservod(vidpid, interface, serialname=None, debuglog=False):
"""Set up a pty
Set up a pty to the ec console in order
to send commands. Returns a pty_driver object.
Args:
vidpid: string vidpid of device to access.
interface: not used.
serialname: string serial name of device requested, optional.
debuglog: chatty printout (boolean)
Returns:
pty object
Raises:
UsbError, SusbError: on device not found
"""
vidstr, pidstr = vidpid.split(":")
vid = int(vidstr, 16)
pid = int(pidstr, 16)
suart = stm32uart.Suart(
vendor=vid,
product=pid,
interface=interface,
serialname=serialname,
debuglog=debuglog,
)
suart.run()
pty = pty_driver.ptyDriver(suart, [])
return pty
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