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# Copyright 2016 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.
from abc import ABCMeta
from abc import abstractmethod
import os
import shutil
import subprocess as sp
import serial
OCD_SCRIPT_DIR = '/usr/share/openocd/scripts'
OPENOCD_CONFIGS = {
'stm32l476g-eval': 'board/stm32l4discovery.cfg',
'nucleo-f072rb': 'board/st_nucleo_f0.cfg',
'nucleo-f411re': 'board/st_nucleo_f4.cfg',
}
FLASH_OFFSETS = {
'stm32l476g-eval': '0x08000000',
'nucleo-f072rb': '0x08000000',
'nucleo-f411re': '0x08000000',
}
REBOOT_MARKER = 'UART initialized after reboot'
class Board(object):
"""Class representing a single board connected to a host machine.
Attributes:
board: String containing actual type of board, i.e. nucleo-f072rb
config: Directory of board config file relative to openocd's
scripts directory
hla_serial: String containing board's hla_serial number (if board
is an stm32 board)
tty_port: String that is the path to the tty port which board's
UART outputs to
tty: String of file descriptor for tty_port
"""
__metaclass__ = ABCMeta # This is an Abstract Base Class (ABC)
def __init__(self, board, module, hla_serial=None):
"""Initializes a board object with given attributes.
Args:
board: String containing board name
module: String of the test module you are building,
i.e. gpio, timer, etc.
hla_serial: Serial number if board's adaptor is an HLA
Raises:
RuntimeError: Board is not supported
"""
if board not in OPENOCD_CONFIGS:
msg = 'OpenOcd configuration not found for ' + board
raise RuntimeError(msg)
if board not in FLASH_OFFSETS:
msg = 'Flash offset not found for ' + board
raise RuntimeError(msg)
self.board = board
self.flash_offset = FLASH_OFFSETS[self.board]
self.openocd_config = OPENOCD_CONFIGS[self.board]
self.module = module
self.hla_serial = hla_serial
self.tty_port = None
self.tty = None
def reset_log_dir(self):
"""Reset log directory."""
if os.path.isdir(self.log_dir):
shutil.rmtree(self.log_dir)
os.makedirs(self.log_dir)
@staticmethod
def get_stlink_serials():
"""Gets serial numbers of all st-link v2.1 board attached to host.
Returns:
List of serials
"""
usb_args = ['lsusb', '-v', '-d', '0x0483:0x374b']
st_link_info = sp.check_output(usb_args)
st_serials = []
for line in st_link_info.split('\n'):
if 'iSerial' not in line:
continue
words = line.split()
if len(words) <= 2:
continue
st_serials.append(words[2].strip())
return st_serials
@abstractmethod
def get_serial(self):
"""Subclass should implement this."""
pass
def send_openocd_commands(self, commands):
"""Send a command to the board via openocd.
Args:
commands: A list of commands to send
Returns:
True if execution is successful or False otherwise.
"""
args = ['openocd', '-s', OCD_SCRIPT_DIR,
'-f', self.openocd_config, '-c', 'hla_serial ' + self.hla_serial]
for cmd in commands:
args += ['-c', cmd]
args += ['-c', 'shutdown']
rv = 1
with open(self.openocd_log, 'a') as output:
rv = sp.call(args, stdout=output, stderr=sp.STDOUT)
if rv != 0:
self.dump_openocd_log()
return rv == 0
def dump_openocd_log(self):
with open(self.openocd_log) as log:
print log.read()
def build(self, ec_dir):
"""Builds test suite module for board.
Args:
ec_dir: String of the ec directory path
Returns:
True if build is successful or False otherwise.
"""
cmds = ['make',
'--directory=' + ec_dir,
'BOARD=' + self.board,
'CTS_MODULE=' + self.module,
'-j']
rv = 1
with open(self.build_log, 'a') as output:
rv = sp.call(cmds, stdout=output, stderr=sp.STDOUT)
if rv != 0:
self.dump_build_log()
return rv == 0
def dump_build_log(self):
with open(self.build_log) as log:
print log.read()
def flash(self, image_path):
"""Flashes board with most recent build ec.bin."""
cmd = ['reset_config connect_assert_srst',
'init',
'reset init',
'flash write_image erase %s %s' % (image_path, self.flash_offset)]
return self.send_openocd_commands(cmd)
def to_string(self):
s = ('Type: Board\n'
'board: ' + self.board + '\n'
'hla_serial: ' + self.hla_serial + '\n'
'openocd_config: ' + self.openocd_config + '\n'
'tty_port: ' + self.tty_port + '\n'
'tty: ' + str(self.tty) + '\n')
return s
def reset_halt(self):
"""Reset then halt board."""
return self.send_openocd_commands(['init', 'reset halt'])
def resume(self):
"""Resume halting board."""
return self.send_openocd_commands(['init', 'resume'])
def setup_tty(self):
"""Call this before calling read_tty for the first time.
This is not in the initialization because caller only should call
this function after serial numbers are setup
"""
self.get_serial()
self.reset_halt()
self.identify_tty_port()
tty = None
try:
tty = serial.Serial(self.tty_port, 115200, timeout=1)
except serial.SerialException:
raise ValueError('Failed to open ' + self.tty_port + ' of ' + self.board +
'. Please make sure the port is available and you have' +
' permission to read it.')
self.tty = tty
def read_tty(self, max_boot_count=1):
"""Read info from a serial port described by a file descriptor.
Args:
max_boot_count: Stop reading if boot count exceeds this number
Returns:
result: characters read from tty
boot: boot counts
"""
buf = []
line = []
boot = 0
while True:
c = self.tty.read()
if not c:
break
line.append(c)
if c == '\n':
l = ''.join(line)
buf.append(l)
if REBOOT_MARKER in l:
boot += 1
line = []
if boot > max_boot_count:
break
l = ''.join(line)
buf.append(l)
result = ''.join(buf)
return result, boot
def identify_tty_port(self):
"""Saves this board's serial port."""
dev_dir = '/dev'
id_prefix = 'ID_SERIAL_SHORT='
com_devices = [f for f in os.listdir(dev_dir) if f.startswith('ttyACM')]
for device in com_devices:
self.tty_port = os.path.join(dev_dir, device)
properties = sp.check_output(
['udevadm', 'info', '-a', '-n', self.tty_port, '--query=property'])
for line in [l.strip() for l in properties.split('\n')]:
if line.startswith(id_prefix):
if self.hla_serial == line[len(id_prefix):]:
return
# If we get here without returning, something is wrong
raise RuntimeError('The device dev path could not be found')
def close_tty(self):
"""Close tty."""
self.tty.close()
class TestHarness(Board):
"""Subclass of Board representing a Test Harness.
Attributes:
serial_path: Path to file containing serial number
"""
def __init__(self, board, module, log_dir, serial_path):
"""Initializes a board object with given attributes.
Args:
board: board name
module: module name
log_dir: Directory where log file is stored
serial_path: Path to file containing serial number
"""
Board.__init__(self, board, module)
self.log_dir = log_dir
self.openocd_log = os.path.join(log_dir, 'openocd_th.log')
self.build_log = os.path.join(log_dir, 'build_th.log')
self.serial_path = serial_path
self.reset_log_dir()
def get_serial(self):
"""Loads serial number from saved location."""
if self.hla_serial:
return # serial was already loaded
try:
with open(self.serial_path, mode='r') as f:
s = f.read()
self.hla_serial = s.strip()
return
except IOError:
msg = ('Your TH board has not been identified.\n'
'Connect only TH and run the script --setup, then try again.')
raise RuntimeError(msg)
def save_serial(self):
"""Saves the TH serial number to a file."""
serials = Board.get_stlink_serials()
if len(serials) > 1:
msg = ('There are more than one test board connected to the host.'
'\nConnect only the test harness and remove other boards.')
raise RuntimeError(msg)
if len(serials) < 1:
msg = ('No test boards were found.\n'
'Check boards are connected.')
raise RuntimeError(msg)
s = serials[0]
serial_dir = os.path.dirname(self.serial_path)
if not os.path.exists(serial_dir):
os.makedirs(serial_dir)
with open(self.serial_path, mode='w') as f:
f.write(s)
self.hla_serial = s
print 'Your TH serial', s, 'has been saved as', self.serial_path
return
class DeviceUnderTest(Board):
"""Subclass of Board representing a DUT board.
Attributes:
th: Reference to test harness board to which this DUT is attached
"""
def __init__(self, board, th, module, log_dir, hla_ser=None):
"""Initializes a DUT object.
Args:
board: String containing board name
th: Reference to test harness board to which this DUT is attached
module: module name
log_dir: Directory where log file is stored
hla_ser: Serial number if board uses an HLA adaptor
"""
Board.__init__(self, board, module, hla_serial=hla_ser)
self.th = th
self.log_dir = log_dir
self.openocd_log = os.path.join(log_dir, 'openocd_dut.log')
self.build_log = os.path.join(log_dir, 'build_dut.log')
self.reset_log_dir()
def get_serial(self):
"""Get serial number.
Precondition: The DUT and TH must both be connected, and th.hla_serial
must hold the correct value (the th's serial #)
Raises:
RuntimeError: DUT isn't found or multiple DUTs are found.
"""
if self.hla_serial is not None:
# serial was already set ('' is a valid serial)
return
serials = Board.get_stlink_serials()
dut = [s for s in serials if self.th.hla_serial != s]
# If len(dut) is 0 then your dut doesn't use an st-link device, so we
# don't have to worry about its serial number
if not dut:
msg = ('Failed to find serial for DUT.\n'
'Is ' + self.board + ' connected?')
raise RuntimeError(msg)
if len(dut) > 1:
msg = ('Found multiple DUTs.\n'
'You can connect only one DUT at a time. This may be caused by\n'
'an incorrect TH serial. Check if ' + self.th.serial_path + '\n'
'contains a correct serial.')
raise RuntimeError(msg)
# Found your other st-link device serial!
self.hla_serial = dut[0]
return
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