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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import re
from PySide6.QtGui import QValidator
from PySide6.QtCore import QByteArray, Signal, Slot
from PySide6.QtWidgets import QGroupBox
from PySide6.QtSerialBus import QCanBusFrame
from ui_sendframebox import Ui_SendFrameBox
THREE_HEX_DIGITS_PATTERN = re.compile("[0-9a-fA-F]{3}")
HEX_NUMBER_PATTERN = re.compile("^[0-9a-fA-F]+$")
MAX_STANDARD_ID = 0x7FF
MAX_EXTENDED_ID = 0x10000000
MAX_PAYLOAD = 8
MAX_PAYLOAD_FD = 64
def is_even_hex(input):
return len(input.replace(" ", "")) % 2 == 0
def insert_space(string, pos):
return string[0:pos] + " " + string[pos:]
# Formats a string of hex characters with a space between every byte
# Example: "012345" -> "01 23 45"
def format_hex_data(input):
out = input.strip()
while True:
match = THREE_HEX_DIGITS_PATTERN.search(out)
if match:
out = insert_space(out, match.end(0) - 1)
else:
break
return out.strip().upper()
class HexIntegerValidator(QValidator):
def __init__(self, parent):
super().__init__(parent)
self.m_maximum = MAX_STANDARD_ID
def validate(self, input, pos):
result = QValidator.Intermediate
if input:
result = QValidator.Invalid
try:
value = int(input, base=16)
if value < self.m_maximum:
result = QValidator.Acceptable
except ValueError:
pass
return result
def set_maximum(self, maximum):
self.m_maximum = maximum
class HexStringValidator(QValidator):
def __init__(self, parent):
super().__init__(parent)
self.m_maxLength = MAX_PAYLOAD
def validate(self, input, pos):
max_size = 2 * self.m_maxLength
data = input.replace(" ", "")
if not data:
return QValidator.Intermediate
# limit maximum size
if len(data) > max_size:
return QValidator.Invalid
# check if all input is valid
if not HEX_NUMBER_PATTERN.match(data):
return QValidator.Invalid
# insert a space after every two hex nibbles
while True:
match = THREE_HEX_DIGITS_PATTERN.search(input)
if not match:
break
start = match.start(0)
end = match.end()
if pos == start + 1:
# add one hex nibble before two - Abc
input = insert_space(input, pos)
elif pos == start + 2:
# add hex nibble in the middle - aBc
input = insert_space(input, end - 1)
pos = end
else:
# add one hex nibble after two - abC
input = insert_space(input, end - 1)
pos = end + 1
return (QValidator.Acceptable, input, pos)
def set_max_length(self, maxLength):
self.m_maxLength = maxLength
class SendFrameBox(QGroupBox):
send_frame = Signal(QCanBusFrame)
def __init__(self, parent):
super().__init__(parent)
self.m_ui = Ui_SendFrameBox()
self.m_ui.setupUi(self)
self.m_hexIntegerValidator = HexIntegerValidator(self)
self.m_ui.frameIdEdit.setValidator(self.m_hexIntegerValidator)
self.m_hexStringValidator = HexStringValidator(self)
self.m_ui.payloadEdit.setValidator(self.m_hexStringValidator)
self.m_ui.dataFrame.toggled.connect(self._data_frame)
self.m_ui.remoteFrame.toggled.connect(self._remote_frame)
self.m_ui.errorFrame.toggled.connect(self._error_frame)
self.m_ui.extendedFormatBox.toggled.connect(self._extended_format)
self.m_ui.flexibleDataRateBox.toggled.connect(self._flexible_datarate)
self.m_ui.frameIdEdit.textChanged.connect(self._frameid_or_payload_changed)
self.m_ui.payloadEdit.textChanged.connect(self._frameid_or_payload_changed)
self._frameid_or_payload_changed()
self.m_ui.sendButton.clicked.connect(self._send)
@Slot(bool)
def _data_frame(self, value):
if value:
self.m_ui.flexibleDataRateBox.setEnabled(True)
@Slot(bool)
def _remote_frame(self, value):
if value:
self.m_ui.flexibleDataRateBox.setEnabled(False)
self.m_ui.flexibleDataRateBox.setChecked(False)
@Slot(bool)
def _error_frame(self, value):
if value:
self.m_ui.flexibleDataRateBox.setEnabled(False)
self.m_ui.flexibleDataRateBox.setChecked(False)
@Slot(bool)
def _extended_format(self, value):
m = MAX_EXTENDED_ID if value else MAX_STANDARD_ID
self.m_hexIntegerValidator.set_maximum(m)
@Slot(bool)
def _flexible_datarate(self, value):
len = MAX_PAYLOAD_FD if value else MAX_PAYLOAD
self.m_hexStringValidator.set_max_length(len)
self.m_ui.bitrateSwitchBox.setEnabled(value)
if not value:
self.m_ui.bitrateSwitchBox.setChecked(False)
@Slot()
def _frameid_or_payload_changed(self):
has_frame_id = bool(self.m_ui.frameIdEdit.text())
self.m_ui.sendButton.setEnabled(has_frame_id)
tt = "" if has_frame_id else "Cannot send because no Frame ID was given."
self.m_ui.sendButton.setToolTip(tt)
if has_frame_id:
is_even = is_even_hex(self.m_ui.payloadEdit.text())
self.m_ui.sendButton.setEnabled(is_even)
tt = "" if is_even else "Cannot send because Payload hex string is invalid."
self.m_ui.sendButton.setToolTip(tt)
@Slot()
def _send(self):
frame_id = int(self.m_ui.frameIdEdit.text(), base=16)
data = self.m_ui.payloadEdit.text().replace(" ", "")
self.m_ui.payloadEdit.setText(format_hex_data(data))
payload = QByteArray.fromHex(bytes(data, encoding='utf8'))
frame = QCanBusFrame(frame_id, payload)
frame.setExtendedFrameFormat(self.m_ui.extendedFormatBox.isChecked())
frame.setFlexibleDataRateFormat(self.m_ui.flexibleDataRateBox.isChecked())
frame.setBitrateSwitch(self.m_ui.bitrateSwitchBox.isChecked())
if self.m_ui.errorFrame.isChecked():
frame.setFrameType(QCanBusFrame.ErrorFrame)
elif self.m_ui.remoteFrame.isChecked():
frame.setFrameType(QCanBusFrame.RemoteRequestFrame)
self.send_frame.emit(frame)
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