def serialReadEvent(self):
# get that character we set up
n = win32file.GetOverlappedResult(
self._serial._port_handle, self._overlappedRead, 0
)
first = to_bytes(self.read_buf[:n])
# now we should get everything that is already in the buffer
flags, comstat = self._clearCommError()
if comstat.cbInQue:
win32event.ResetEvent(self._overlappedRead.hEvent)
rc, buf = win32file.ReadFile(
self._serial._port_handle,
win32file.AllocateReadBuffer(comstat.cbInQue),
self._overlappedRead,
)
n = win32file.GetOverlappedResult(
self._serial._port_handle, self._overlappedRead, 1
)
# handle all the received data:
self.protocol.dataReceived(first + to_bytes(buf[:n]))
else:
# handle all the received data:
self.protocol.dataReceived(first)
# set up next one
win32event.ResetEvent(self._overlappedRead.hEvent)
rc, self.read_buf = win32file.ReadFile(
self._serial._port_handle,
win32file.AllocateReadBuffer(1),
self._overlappedRead,
)
def write(self, data):
if not self.is_open:
raise portNotOpenError
data = to_bytes(data)
tx_len = len(data)
while tx_len > 0:
to_be_sent = min(tx_len, 0x3F)
report = to_bytes([to_be_sent]) + data[:to_be_sent]
self._hid_handle.write(report)
data = data[to_be_sent:]
tx_len = len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = length = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r],
[self.fd], [],
timeout.time_left())
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r],
[self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('write failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY,
errno.EWOULDBLOCK, errno.EINPROGRESS,
errno.EINTR):
raise SerialException('write failed: {}'.format(e))
if not timeout.is_non_blocking and timeout.expired():
raise writeTimeoutError
return length - len(d)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = len(d)
if self._write_timeout is not None and self._write_timeout > 0:
timeout = time.time() + self._write_timeout
else:
timeout = None
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
timeleft = timeout - time.time()
if timeleft < 0:
raise writeTimeoutError
_, ready, _ = select.select([], [self.fd], [], timeleft)
if not ready:
raise writeTimeoutError
else:
# wait for write operation
_, ready, _ = select.select([], [self.fd], [], None)
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: %s' % (v,))
return len(data)
def start_server(port, baud_rate, receiver):
"""Start serial server. Keeps listening to the given port at the baud rate
specified and writes the commands coming in to the receiver
:param port: the serial port address to listen at
:param baud_rate: the data transmission rate
:param receiver: the receiver in charge of handling the incoming messages
"""
with serial.Serial(port, baud_rate, timeout=2) as ser:
print("Listening on port {}, press Ctrl+c to exit.".format(port))
while True:
if receiver.is_timeout():
logger.warn("Timeout")
receiver.reset()
# Read from the sender
line = ser.readline()
if not line:
continue
# Notify the receiver with the new command
receiver.write(line)
# Does the receiver has to send something back?
response = receiver.read()
if response:
socket = serial.Serial(port, baud_rate, timeout=10)
socket.write(to_bytes(response))
def write(self, data):
"""\
Output the given byte string over the serial port. Can block if the
connection is blocked. May raise SerialException if the connection is
closed.
"""
self._cancel_write = False
if not self.is_open:
raise portNotOpenError
data = to_bytes(data)
# calculate aprox time that would be used to send the data
time_used_to_send = 10.0 * len(data) / self._baudrate
# when a write timeout is configured check if we would be successful
# (not sending anything, not even the part that would have time)
if self._write_timeout is not None and time_used_to_send > self._write_timeout:
# must wait so that unit test succeeds
time_left = self._write_timeout
while time_left > 0 and not self._cancel_write:
time.sleep(min(time_left, 0.5))
time_left -= 0.5
if self._cancel_write:
return 0 # XXX
raise writeTimeoutError
for byte in iterbytes(data):
self.queue.put(byte, timeout=self._write_timeout)
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
#~ if not isinstance(data, (bytes, bytearray)):
#~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
data = to_bytes(data)
if data:
#~ win32event.ResetEvent(self._overlapped_write.hEvent)
n = win32.DWORD()
err = win32.WriteFile(self._port_handle, data, len(data), ctypes.byref(n), self._overlapped_write)
if not err and win32.GetLastError() != win32.ERROR_IO_PENDING:
raise SerialException("WriteFile failed ({!r})".format(ctypes.WinError()))
if self._write_timeout != 0: # if blocking (None) or w/ write timeout (>0)
# Wait for the write to complete.
#~ win32.WaitForSingleObject(self._overlapped_write.hEvent, win32.INFINITE)
err = win32.GetOverlappedResult(self._port_handle, self._overlapped_write, ctypes.byref(n), True)
if win32.GetLastError() == win32.ERROR_OPERATION_ABORTED:
return n.value # canceled IO is no error
if n.value != len(data):
raise writeTimeoutError
return n.value
else:
return 0
def write(self, data):
"""\
Output the given byte string over the serial port. Can block if the
connection is blocked. May raise SerialException if the connection is
closed.
"""
self._cancel_write = False
if not self.is_open:
raise portNotOpenError
data = to_bytes(data)
# calculate aprox time that would be used to send the data
time_used_to_send = 10.0 * len(data) / self._baudrate
# when a write timeout is configured check if we would be successful
# (not sending anything, not even the part that would have time)
if self._write_timeout is not None and time_used_to_send > self._write_timeout:
# must wait so that unit test succeeds
time_left = self._write_timeout
while time_left > 0 and not self._cancel_write:
time.sleep(min(time_left, 0.5))
time_left -= 0.5
if self._cancel_write:
return 0 # XXX
raise writeTimeoutError
for byte in iterbytes(data):
self.queue.put(byte, timeout=self._write_timeout)
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = len(d)
if self._write_timeout is not None and self._write_timeout > 0:
timeout = time.time() + self._write_timeout
else:
timeout = None
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
timeleft = timeout - time.time()
if timeleft < 0:
raise writeTimeoutError
_, ready, _ = select.select([], [self.fd], [], timeleft)
if not ready:
raise writeTimeoutError
else:
# wait for write operation
_, ready, _ = select.select([], [self.fd], [], None)
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: %s' % (v, ))
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
#~ if not isinstance(data, (bytes, bytearray)):
#~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
data = to_bytes(data)
if data:
#~ win32event.ResetEvent(self._overlapped_write.hEvent)
n = win32.DWORD()
err = win32.WriteFile(self._port_handle, data, len(data),
ctypes.byref(n), self._overlapped_write)
if not err and win32.GetLastError() != win32.ERROR_IO_PENDING:
raise SerialException("WriteFile failed ({!r})".format(
ctypes.WinError()))
if self._write_timeout != 0: # if blocking (None) or w/ write timeout (>0)
# Wait for the write to complete.
#~ win32.WaitForSingleObject(self._overlapped_write.hEvent, win32.INFINITE)
err = win32.GetOverlappedResult(self._port_handle,
self._overlapped_write,
ctypes.byref(n), True)
if win32.GetLastError() == win32.ERROR_OPERATION_ABORTED:
return n.value # canceled IO is no error
if n.value != len(data):
raise writeTimeoutError
return n.value
else:
return 0
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = length = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], timeout.time_left())
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as e:
# this is for Python 3.x where select.error is a subclass of
# OSError ignore BlockingIOErrors and EINTR. other errors are shown
# https://www.python.org/dev/peps/pep-0475.
if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('write failed: {}'.format(e))
except select.error as e:
# this is for Python 2.x
# ignore BlockingIOErrors and EINTR. all errors are shown
# see also http://www.python.org/dev/peps/pep-3151/#select
if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
raise SerialException('write failed: {}'.format(e))
if not timeout.is_non_blocking and timeout.expired():
raise writeTimeoutError
return length - len(d)
def write(self, data):
"""\
Output the given byte string over the serial port. Can block if the
connection is blocked. May raise SerialException if the connection is
closed.
"""
if not self.is_open:
raise portNotOpenError
try:
self._socket.sendall(to_bytes(data))
except socket.error as e:
# XXX what exception if socket connection fails
raise SerialException("socket connection failed: %s" % e)
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = len(d)
timeout = self._write_timeout
if timeout and timeout > 0: # Avoid comparing None with zero
timeout += time.time()
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout == 0:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif timeout and timeout > 0: # Avoid comparing None with zero
# when timeout is set, use select to wait for being ready
# with the time left as timeout
timeleft = timeout - time.time()
if timeleft < 0:
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r],
[self.fd], [], timeleft)
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r],
[self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: {}'.format(v))
# still calculate and check timeout
if timeout and timeout - time.time() < 0:
raise writeTimeoutError
return len(data)
def serialReadEvent(self):
#get that character we set up
n = win32file.GetOverlappedResult(self._serial._port_handle, self._overlappedRead, 0)
first = to_bytes(self.read_buf[:n])
#now we should get everything that is already in the buffer
flags, comstat = self._clearCommError()
if comstat.cbInQue:
win32event.ResetEvent(self._overlappedRead.hEvent)
rc, buf = win32file.ReadFile(self._serial._port_handle,
win32file.AllocateReadBuffer(comstat.cbInQue),
self._overlappedRead)
n = win32file.GetOverlappedResult(self._serial._port_handle, self._overlappedRead, 1)
#handle all the received data:
self.protocol.dataReceived(first + to_bytes(buf[:n]))
else:
#handle all the received data:
self.protocol.dataReceived(first)
#set up next one
win32event.ResetEvent(self._overlappedRead.hEvent)
rc, self.read_buf = win32file.ReadFile(self._serial._port_handle,
win32file.AllocateReadBuffer(1),
self._overlappedRead)
def write(self, data):
"""\
Output the given byte string over the serial port. Can block if the
connection is blocked. May raise SerialException if the connection is
closed.
"""
if not self.is_open:
raise portNotOpenError
try:
self._socket.sendall(to_bytes(data))
except socket.error as e:
# XXX what exception if socket connection fails
raise SerialException("socket connection failed: %s" % e)
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = len(d)
timeout = self._write_timeout
if timeout and timeout > 0: # Avoid comparing None with zero
timeout += time.time()
while tx_len > 0:
try:
n = os.write(self.fd, d)
if timeout == 0:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif timeout and timeout > 0: # Avoid comparing None with zero
# when timeout is set, use select to wait for being ready
# with the time left as timeout
timeleft = timeout - time.time()
if timeleft < 0:
raise writeTimeoutError
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], timeleft)
if abort:
os.read(self.pipe_abort_write_r, 1000)
break
if not ready:
raise writeTimeoutError
else:
assert timeout is None
# wait for write operation
abort, ready, _ = select.select([self.pipe_abort_write_r], [self.fd], [], None)
if abort:
os.read(self.pipe_abort_write_r, 1)
break
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: {}'.format(v))
# still calculate and check timeout
if timeout and timeout - time.time() < 0:
raise writeTimeoutError
return len(data)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise PortNotOpenError()
#~ if not isinstance(data, (bytes, bytearray)):
#~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
data = to_bytes(data)
if data:
#~ win32event.ResetEvent(self._overlapped_write.hEvent)
n = win32.DWORD()
success = win32.WriteFile(self._port_handle, data, len(data),
ctypes.byref(n), self._overlapped_write)
if self._write_timeout != 0: # if blocking (None) or w/ write timeout (>0)
if not success and win32.GetLastError() not in (
win32.ERROR_SUCCESS, win32.ERROR_IO_PENDING):
raise SerialException("WriteFile failed ({!r})".format(
ctypes.WinError()))
# Wait for the write to complete.
#~ win32.WaitForSingleObject(self._overlapped_write.hEvent, win32.INFINITE)
win32.GetOverlappedResult(self._port_handle,
self._overlapped_write,
ctypes.byref(n), True)
if win32.GetLastError() == win32.ERROR_OPERATION_ABORTED:
return n.value # canceled IO is no error
if n.value != len(data):
raise SerialTimeoutException('Write timeout')
return n.value
else:
errorcode = win32.ERROR_SUCCESS if success else win32.GetLastError(
)
if errorcode in (win32.ERROR_INVALID_USER_BUFFER,
win32.ERROR_NOT_ENOUGH_MEMORY,
win32.ERROR_OPERATION_ABORTED):
return 0
elif errorcode in (win32.ERROR_SUCCESS,
win32.ERROR_IO_PENDING):
# no info on true length provided by OS function in async mode
return len(data)
else:
raise SerialException("WriteFile failed ({!r})".format(
ctypes.WinError()))
else:
return 0
def write(self, data):
"""\
Output the given byte string over the serial port. Can block if the
connection is blocked. May raise SerialException if the connection is
closed.
"""
if not self.is_open:
raise portNotOpenError
d = to_bytes(data)
tx_len = length = len(d)
timeout = Timeout(self._write_timeout)
while tx_len > 0:
try:
n = self._socket.send(d)
if timeout.is_non_blocking:
# Zero timeout indicates non-blocking - simply return the
# number of bytes of data actually written
return n
elif not timeout.is_infinite:
# when timeout is set, use select to wait for being ready
# with the time left as timeout
if timeout.expired():
raise writeTimeoutError
_, ready, _ = select.select([], [self._socket], [],
timeout.time_left())
if not ready:
raise writeTimeoutError
else:
assert timeout.time_left() is None
# wait for write operation
_, ready, _ = select.select([], [self._socket], [], None)
if not ready:
raise SerialException('write failed (select)')
d = d[n:]
tx_len -= n
except SerialException:
raise
except OSError as v:
if v.errno != errno.EAGAIN:
raise SerialException('write failed: {}'.format(v))
# still calculate and check timeout
if timeout.expired():
raise writeTimeoutError
return length - len(d)
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
#~ if not isinstance(data, (bytes, bytearray)):
#~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
data = to_bytes(data)
if data:
#~ win32event.ResetEvent(self._overlapped_write.hEvent)
n = win32.DWORD()
success = win32.WriteFile(self._port_handle, data, len(data), ctypes.byref(n), self._overlapped_write)
if self._write_timeout != 0: # if blocking (None) or w/ write timeout (>0)
if not success and win32.GetLastError() != win32.ERROR_IO_PENDING:
raise SerialException("WriteFile failed ({!r})".format(ctypes.WinError()))
# Wait for the write to complete.
#~ win32.WaitForSingleObject(self._overlapped_write.hEvent, win32.INFINITE)
win32.GetOverlappedResult(self._port_handle, self._overlapped_write, ctypes.byref(n), True)
if win32.GetLastError() == win32.ERROR_OPERATION_ABORTED:
return n.value # canceled IO is no error
if n.value != len(data):
raise writeTimeoutError
return n.value
else:
errorcode = win32.ERROR_SUCCESS if success else win32.GetLastError()
if errorcode in (win32.ERROR_INVALID_USER_BUFFER, win32.ERROR_NOT_ENOUGH_MEMORY,
win32.ERROR_OPERATION_ABORTED):
return 0
elif errorcode in (win32.ERROR_SUCCESS, win32.ERROR_IO_PENDING):
# no info on true length provided by OS function in async mode
return len(data)
else:
raise SerialException("WriteFile failed ({!r})".format(ctypes.WinError()))
else:
return 0
def getc(size, timeout=1):
data = to_bytes(ser.read(size))
return data
def write_delayed(data):
data = to_bytes(data)
data = [bytes([b]) for b in data]
for b in data:
self.ser.__write_orig(b)
time.sleep(delay)
def putc(data, timeout=1):
data = to_bytes(data)
return ser.write(data)
def write(self, tx):
tx = to_bytes(tx)
self.formatter.tx(tx)
return super(Serial, self).write(tx)
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# Python port of BaySerial PHP library
# Author: Stefan Holzheu <*****@*****.**>
#
#
#
from time import time, sleep
import serial
from struct import pack, unpack
from serial.serialutil import XON, XOFF, to_bytes
XBEE_ESCAPE = to_bytes([0x7d])
XBEE_DELIM = to_bytes([0x7e])
API_DATA = to_bytes([0x1])
API_ACK = to_bytes([0x2])
TX_OK = to_bytes([0x1])
TX_CHECKSUM_FAILED = to_bytes([0x2])
TX_BREAK = to_bytes([0x3])
class BaySerial:
def __init__(self):
self.ser=None
self.stack=[]
self.count=0;
def begin(self,dev,baud=38400):
self.ser=serial.Serial(dev,baud,timeout=0)
#!/usr/bin/python
import os, sqlite3, time
from serial.serialutil import to_bytes
conn = sqlite3.connect('/home/pi/workspace/raspi_net/server/db/sys.db')
c = conn.cursor()
print "Opened database successfully"
cursor = c.execute("SELECT TEMP, HUMI FROM TEMP_HUMI ORDER BY ID DESC LIMIT 1")
row = cursor.fetchone()
command = str(round(row[0], 2)) + "_" + str(round(row[1], 2)) + "_" + str(
time.strftime("%H", time.localtime()))
print "Operation done successfully"
conn.close()
print command + "\n"
d = to_bytes(command)
serial = os.open('/dev/ttyACM0', os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
os.write(serial, d)
