Python中canmatrix解析dbc文件应用常见示例

from canmatrix import convert

convert.convert(
    r'aa.dbc',
    r'aa.xlsx'
)

import canmatrix
file = r'Test.dbc'
dbs = canmatrix.formats.loadp(file)
print(type(dbs), dbs)

matrix = dbs.get('')
print(type(matrix), matrix)
for k, v in matrix.__dict__.items():
    print(k, v)

for ecu in matrix.ecus:
    print(type(ecu), ecu.__dict__)

for msg in matrix.frames:
    print(type(msg), msg.__dict__)
    for k, v in msg.__dict__.items():
        print(k, v)

    for signal in msg.signals:
        print(type(signal), signal.__dict__)
        for k, v in signal.__dict__.items():
            print(k, v)

    for signalGroup in msg.signalGroups:
        print(type(signalGroup), signalGroup.__dict__)
        for k, v in signalGroup.__dict__.items():
            print(k, v)

def is_signal_e2e(signal: canmatrix.Signal):
    """
    判断信号是否是E2E信号，checksum or rolling_counter
    """
    RCs = ("RollCnt", "RollingCounter", "AliveCounter", "Rolling_Counter", "Alive_Counter", "RollgCnt")
    CRCs = ("Chksum", "Chksm", "CheckSum", "CRC")
    for rc in RCs:
        if rc.lower() in signal.name.lower():
            return True
    for crc in CRCs:
        if crc.lower() in signal.name.lower():
            return True
    return False

def get_signal_dataType(signal: canmatrix.Signal):
    """
    计算信号生成代码的数据类型。
    """
    dataType = "UnknownType "
    if signal.is_float is True:
        if signal.size == 32:
            dataType = "float32"
        elif signal.size == 64:
            dataType = "float64"
        else:
            print(f"Not supported <{signal.size}> size of <float> data type. <{signal.__dict__}>")
    elif (signal.factor != 1) or (signal.offset != 0):
        dataType = "float32"
    elif signal.size == 1:
        dataType = "boolean"
    elif signal.size <= 8:
        if signal.is_signed:
            dataType = "sint8"
        else:
            dataType = "uint8"
    elif signal.size <= 16:
        if signal.is_signed:
            dataType = "sint16"
        else:
            dataType = "uint16"
    elif signal.size <= 32:
        if signal.is_signed:
            dataType = "sint32"
        else:
            dataType = "uint32"
    elif signal.size <= 64:
        if signal.is_signed:
            dataType = "sint64"
        else:
            dataType = "uint64"
    else:
        print(f"Unexpected datatype of signal. <{signal.__dict__}>")
    return f"{dataType}"