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# -*- coding: utf-8 -*-
import io
# import os.path
import textwrap
import attr
import canmatrix.formats
def load_dbc():
test_file = "tests/files/dbc/test_frame_decoding.dbc"
return canmatrix.formats.loadp_flat(test_file)
def test_encode_with_dbc_big_endian():
cm = load_dbc()
# 002#0C00057003CD1F83
frame = cm.frame_by_id(canmatrix.ArbitrationId(1))
to_encode = dict()
to_encode["sig0"] = 1
to_encode["sig1"] = 35
to_encode["sig2"] = 0
to_encode["sig3"] = 2048
to_encode["sig4"] = 256
to_encode["sig5"] = 1
to_encode["sig6"] = 0
to_encode["sig7"] = 520
to_encode["sig8"] = 0
to_encode["sig9"] = 0
to_encode["sig10"] = 0
frame_data = frame.encode(to_encode)
assert frame_data == bytearray([141, 0, 16, 1, 0, 130, 1, 0])
def test_encode_with_dbc_little_endian():
cm = load_dbc()
# 002#0C00057003CD1F83
frame = cm.frame_by_id(canmatrix.ArbitrationId(2))
to_encode = dict()
to_encode["secSig1"] = 0
to_encode["secSig2"] = 0
to_encode["secSig3"] = 0
to_encode["secSig4"] = 2
to_encode["secSig5"] = 0
to_encode["secSig6"] = 0
to_encode["secSig7"] = 0
to_encode["secSig8"] = 3
to_encode["secSig9"] = 1
to_encode["secSig10"] = 1280
to_encode["secSig11"] = -144
to_encode["secSig12"] = 12
frame_data = frame.encode(to_encode)
assert frame_data == bytearray([0x0c, 0x00, 0x05, 0x70, 0x03, 0x00, 0x10, 0x83])
def test_encode_with_dbc_float():
cm = load_dbc()
# 003#38638A7E58A8C540
frame = cm.frame_by_id(canmatrix.ArbitrationId(3))
to_encode = dict()
to_encode["floatSignal1"] = 5.424999835668132e-05
to_encode["floatSignal2"] = 6.176799774169922
frame_data = frame.encode(to_encode)
assert frame_data == bytearray([0x38, 0x63, 0x8A, 0x7E, 0x58, 0xA8, 0xC5, 0x40])
def test_encode_with_dbc_multiplex():
cm = load_dbc()
frame = cm.frame_by_id(canmatrix.ArbitrationId(4))
to_encode1 = dict()
to_encode1["myMuxer"] = 0
to_encode1["muxSig9"] = 0x20
to_encode1["muxSig1"] = 0x38
to_encode1["muxSig2"] = 0x63
to_encode1["muxSig3"] = 0x8A
to_encode1["muxSig4"] = 0x3F
frame_data1 = frame.encode(to_encode1)
assert frame_data1 == bytearray([0x38, 0x63, 0x8A, 0x7E, 0x00, 0x20, 0x00])
to_encode2 = dict()
to_encode2["myMuxer"] = 1
to_encode2["muxSig9"] = 0x20
to_encode2["muxSig5"] = -6
to_encode2["muxSig6"] = 0x18
to_encode2["muxSig7"] = 0x0C
to_encode2["muxSig8"] = -8
frame_data2 = frame.encode(to_encode2)
assert frame_data2 == bytearray([0x38, 0x60, 0x80, 0x1E, 0x18, 0x20, 0x20])
def test_sym():
"""Test signal and frame encoding based on a .sym file
The symbol file was created using the PCAN Symbol Editor. The reference
transmissions were created using PCAN Explorer. The result message bytes
were observed in PCAN-View.
PCAN Symbol Editor v3.1.6.342
PCAN Explorer v5.3.4.823
PCAN-View v4.2.1.533
"""
s = textwrap.dedent(
u'''\
FormatVersion=5.0 // Do not edit this line!
Title="Untitled"
{SENDRECEIVE}
[Unsigned]
ID=000h
DLC=7
Var=two_bit_big_endian unsigned 33,2 -m
Var=two_bit_little_endian unsigned 30,2
Var=seven_bit_big_endian unsigned 4,7 -m
Var=seven_bit_little_endian unsigned 5,7
Var=eleven_bit_big_endian unsigned 35,11 -m
Var=eleven_bit_little_endian unsigned 18,11
[Signed]
ID=001h
DLC=7
Var=two_bit_big_endian signed 33,2 -m
Var=two_bit_little_endian signed 30,2
Var=seven_bit_big_endian signed 4,7 -m
Var=seven_bit_little_endian signed 5,7
Var=eleven_bit_big_endian signed 35,11 -m
Var=eleven_bit_little_endian signed 18,11
''',
)
f = io.BytesIO(s.encode('utf-8'))
matrix = canmatrix.formats.load_flat(f, import_type='sym')
unsigned_frame = matrix.frame_by_name('Unsigned')
signed_frame = matrix.frame_by_name('Signed')
@attr.s(frozen=True)
class TestFrame(object):
two_bit_big_endian = attr.ib(default=0)
two_bit_little_endian = attr.ib(default=0)
seven_bit_big_endian = attr.ib(default=0)
seven_bit_little_endian = attr.ib(default=0)
eleven_bit_big_endian = attr.ib(default=0)
eleven_bit_little_endian = attr.ib(default=0)
def encode(self, frame_to_encode):
return frame_to_encode.encode(attr.asdict(self))
unsigned_cases = {
TestFrame(): b'\x00\x00\x00\x00\x00\x00\x00',
TestFrame(two_bit_big_endian=1): b'\x00\x00\x00\x00\x20\x00\x00',
TestFrame(two_bit_big_endian=2): b'\x00\x00\x00\x00\x40\x00\x00',
TestFrame(two_bit_little_endian=1): b'\x00\x00\x00\x40\x00\x00\x00',
TestFrame(two_bit_little_endian=2): b'\x00\x00\x00\x80\x00\x00\x00',
TestFrame(seven_bit_big_endian=1): b'\x00\x20\x00\x00\x00\x00\x00',
TestFrame(seven_bit_big_endian=64): b'\x08\x00\x00\x00\x00\x00\x00',
TestFrame(seven_bit_little_endian=1): b'\x20\x00\x00\x00\x00\x00\x00',
TestFrame(seven_bit_little_endian=64): b'\x00\x08\x00\x00\x00\x00\x00',
TestFrame(eleven_bit_big_endian=1): b'\x00\x00\x00\x00\x00\x04\x00',
TestFrame(eleven_bit_big_endian=1024): b'\x00\x00\x00\x00\x10\x00\x00',
TestFrame(eleven_bit_little_endian=1): b'\x00\x00\x04\x00\x00\x00\x00',
TestFrame(eleven_bit_little_endian=1024): (
b'\x00\x00\x00\x10\x00\x00\x00'
),
}
signed_cases = {
TestFrame(): b'\x00\x00\x00\x00\x00\x00\x00',
TestFrame(two_bit_big_endian=1): b'\x00\x00\x00\x00\x20\x00\x00',
TestFrame(two_bit_big_endian=-2): b'\x00\x00\x00\x00\x40\x00\x00',
TestFrame(two_bit_little_endian=1): b'\x00\x00\x00\x40\x00\x00\x00',
TestFrame(two_bit_little_endian=-2): b'\x00\x00\x00\x80\x00\x00\x00',
TestFrame(seven_bit_big_endian=1): b'\x00\x20\x00\x00\x00\x00\x00',
TestFrame(seven_bit_big_endian=-2): b'\x0F\xC0\x00\x00\x00\x00\x00',
TestFrame(seven_bit_little_endian=1): b'\x20\x00\x00\x00\x00\x00\x00',
TestFrame(seven_bit_little_endian=-2): b'\xC0\x0F\x00\x00\x00\x00\x00',
TestFrame(eleven_bit_big_endian=1): b'\x00\x00\x00\x00\x00\x04\x00',
TestFrame(eleven_bit_big_endian=-2): b'\x00\x00\x00\x00\x1F\xF8\x00',
TestFrame(eleven_bit_little_endian=1): b'\x00\x00\x04\x00\x00\x00\x00',
TestFrame(eleven_bit_little_endian=-2): (
b'\x00\x00\xF8\x1F\x00\x00\x00'
),
}
def h(b):
return ' '.join('{:02X}'.format(c) for c in b)
frame_case_pairs = (
(unsigned_frame, unsigned_cases),
(signed_frame, signed_cases),
)
for frame, cases in frame_case_pairs:
for test_frame, expected in cases.items():
expected = bytearray(expected)
encoded = test_frame.encode(frame)
print(test_frame)
print(h(encoded))
print(h(expected))
assert encoded == expected
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