Python CAN总线通知器

Question

我正试图连接到我的汽车的CAN总线上。连接正常，数据打印到终端，没有任何问题。

bus = can.interface.Bus("can0", bustype="socketcan")
notifier = can.Notifier(bus, [can.Printer()])

我正在使用PythonCAN2.2和python3.7。

我想在can.dlc上添加一个新的监听器，其中包含一些开关-大小写语句。下面的伪码会是最好的方法吗？

import can

def parse_data(can):
    SingleCanFrame = can.Message
    print(SingleCanFrame)
    if SingleCanFrame.arbitration_id == 304:    #car voltage
        #convert data 
        #save to DB table 1
    elif SingleCanFrame.arbitration_id == 400:  #car speed
        #convert data 
        #save to DB table 2
    elif SingleCanFrame.arbitration_id == 401:  #car tachometer
        #convert data 
        #save to DB table 3
    else:
        #save to DB errorlog
    
bus = can.interface.Bus("can0", bustype="socketcan")    
notifier = can.Notifier(bus, [parse_data(can)]) 

编辑1：

忘记参数: def parse_data(can)

编辑2：

新码

import can

CAR = {"voltage": 304, "speed": 400, "tachometer": 401}

def cellvoltage(SingleCanFrame, MyDB):
    #convert data 
    #save to DB table 1
def packcurrent(SingleCanFrame, MyDB):
    #convert data 
    #save to DB table 2
def tachometer(SingleCanFrame, MyDB):
    #convert data 
    #save to DB table 3

def parse_data(can):
    SingleCanFrame = can.Message
    MyDB = SomeDB.Connect()
    print(SingleCanFrame)
    if SingleCanFrame.arbitration_id == CAR["voltage"]: #car voltage
        cellvoltage(SingleCanFrame, MyDB)
    elif SingleCanFrame.arbitration_id == CAR["speed"]: #car speed
        packcurrent(SingleCanFrame, MyDB)
    elif SingleCanFrame.arbitration_id == CAR["tachometer"]:    #car tachometer
        tachometer(SingleCanFrame, MyDB)
    else:
        #save to DB errorlog
    
bus = can.interface.Bus("can0", bustype="socketcan")    
notifier = can.Notifier(bus, [parse_data(can)]) 

Answer 1

从本质上说，这将是一个很好的方法来做到这一点。

然而，如果你想更清楚地表达你的意图，一本字典就会有帮助：

CAR = {"voltage": 304, "speed": 400, "tachometer": 401} # capital var name as this a constant var

然后，您只需将这些值称为if SingleCanFrame.dlc == CAR["voltage"]:，这样就不那么容易出错了。