Файл dbc Cantools

После разговора с NMEA2000.org я узнал, что их база данных необходима для покупки файла dbc NMEA2000 у стороннего производителя. База данных NMEA2000 стоит очень дорого, в тысячах долларов. Поэтому я решил пойти в другом направлении и расшифровать его самостоятельно.

При использовании Python Can структура сообщений can в библиотеке can работает отлично. Используя этот документ github для структур NMEA2000 PGN, вы можете делать все, что захотите. Github может реализовать проект.

Продолжая отлаживать эту проблему, я смог найти работающее доказательство концепции скрипта Python. Он был разработан на Raspberry Pi 4 B с разъемом PiCAN-M для интерфейса NMEA2000. Вы можете заменить строку инициализации can0 для последовательного порта/USB и использовать ActiSense NGT-1.

Также необходимы графические кнопки или просто измените их на цвета для включения/выключения. Он был разработан с использованием стандартного оборудования NMEA2000, YachtDevices YDSC-04 (для переключателей) и релейного модуля Oceanic Systems (для освещения). Он поддерживает стандартную цифровую коммутацию NMEA2000, а не проприетарные.

Это конкретно касается отправки PGN127501 (состояние переключателя) и PGN127502 (состояние переключателя). Он также декодирует 127502 для обновления состояния переключателя. Интерфейс представляет собой графический графический интерфейс с сенсорным экраном на 8 переключателей. Существует оператор(ы) отладки печати, который печатает все полученные номера PGN, без данных. PGN127501 не декодируется в этом доказательстве концепции, но структура данных такая же, как и у 127502, поэтому для этого существует код.

from tkinter import *
import tkinter.font as fnt
import array as arr 
import can
import time
import os
import threading 
from bitstring import BitArray
from can import Message
            
def button_click(btn):
    if btn == 'b1':       
        if onoff[0]==1:
            button1.config(image=imgon)
            onoff[0]=2
            snd501(b'\xfd\xff') 
            snd502(b'\xfd\xff')        
        else:
            button1.config(image=imgoff)
            onoff[0]=1
            snd501(b'\xfc\xff')
            snd502(b'\xfc\xff')
    elif btn == 'b2':
        if onoff[1]==1:
            button2.config(image=imgon)
            onoff[1]=2
            snd501(b'\xf7\xff')
            snd502(b'\xf7\xff')
        else:
            button2.config(image=imgoff)
            onoff[1]=1
            snd501(b'\xf3\xff')
            snd502(b'\xf3\xff')
    elif btn == 'b3':      
        if onoff[2]==1:
            button3.config(image=imgon)
            onoff[2]=2
            snd501(b'\xdf\xff')  
            snd502(b'\xdf\xff')        
        else:
            button3.config(image=imgoff)
            onoff[2]=1
            snd501(b'\xcf\xff')
            snd502(b'\xcf\xff')
    elif btn == 'b4':
        if onoff[3]==1:
            button4.config(image=imgon)
            onoff[3]=2
            snd501(b'\x7f\xff')
            snd502(b'\x7f\xff')
        else:
            button4.config(image=imgoff)
            onoff[3]=1
            snd501(b'\x3f\xff')
            snd502(b'\x3f\xff')
    elif btn == 'b5':
        if onoff[4]==1:
            button5.config(image=imgon)
            onoff[4]=2
            snd501(b'\xff\xfd')
            snd502(b'\xff\xfd')
        else:
            button5.config(image=imgoff)
            onoff[4]=1
            snd501(b'\xff\xfc')
            snd502(b'\xff\xfc')
    elif btn == 'b6':
        if onoff[5]==1:
            button6.config(image=imgon)
            onoff[5]=2
            snd501(b'\xff\xf7') 
            snd502(b'\xff\xf7') 
        else:     
            button6.config(image=imgoff)
            onoff[5]=1
            snd501(b'\xff\xf3')
            snd502(b'\xff\xf3')
    elif btn == 'b7':
        if onoff[6]==1:
            button7.config(image=imgon)
            onoff[6]=2
            snd501(b'\xff\xdf')
            snd502(b'\xff\xdf')         
        else:
            button7.config(image=imgoff)
            onoff[6]=1
            snd501(b'\xff\xcf')
            snd502(b'\xff\xcf')
    elif btn == 'b8':
        if onoff[7]==1:
            button8.config(image=imgon)
            onoff[7]=2
            snd501(b'\xff\x7f')
            snd502(b'\xff\x7f')
        else:
            button8.config(image=imgoff)
            onoff[7]=1
            snd501(b'\xff\x3f')
            snd502(b'\xff\x3f')

def snd501(BANKSTATUS):
    msg = Message(data=bytearray(BANK.to_bytes(1,'big') + BANKSTATUS + BLANK),
                    arbitration_id=PGN501,
                    dlc=8,
                    channel='can0',
                    timestamp=time.time(),
                    is_extended_id=True)
    bus.send(msg)
    print('PGN SENT: ' + PGN501 + ' ID: ' + str(msg.arbitration_id) + ' Data: ' + str(msg.data ))

def snd502(BANKSTATUS):
    msg = Message(data=bytearray(BANK.to_bytes(1,'big') + BANKSTATUS + BLANK),
                    arbitration_id=PGN502,
                    dlc=8,
                    channel='can0',
                    timestamp=time.time(),
                    is_extended_id=True)
    bus.send(msg)
    print('PGN SENT: ' + PGN502 + ' ID: ' + str(msg.arbitration_id) + ' Data: ' + str(msg.data ))

def getpgn(pgn): 
    pgn=bin(pgn) #Get bin of the id
    pgn = pgn[2:len(pgn)] # strip off the '0b'
    while len(pgn) < 29 : # make sure it's 29 bits
        pgn = '0' + pgn 
    pgn = pgn[3:-8] #get the middle 18 bits
    pgn = int(pgn, 2) #convert to int
    return pgn

def handle_data(PGN, data):
    if PGN == 127502:
        msgData = data
        if getBank(msgData) == BANK:
            bankstatus = str(data)
            # print(bankstatus[18:-26])
            # print(bankstatus[22:-22])
            bankstatus1 = bankstatus[18:-26]
            SetBank1Value(bankstatus1)
            bankstatus2 = bankstatus[22:-22]
            SetBank2Value(bankstatus2)
    if PGN == 127501:
        msgData = data
        if getBank(msgData) == BANK:
            bankstatus = str(data)
            print(bank status)

def SetBank1Value(bankstatus):
    if bankstatus != 'ff':
        if bankstatus == 'fd':
            button1.config(image=imgon)
            onoff[0]=2
        elif bankstatus == 'fc':
            button1.config(image=imgoff)
            onoff[0]=1
        elif bankstatus == 'f7':
            button2.config(image=imgon)
            onoff[1]=2
        elif bankstatus == 'f3':
            button2.config(image=imgoff)
            onoff[1]=1               
        elif bankstatus == 'df':
            button3.config(image=imgon)
            onoff[2]=2
        elif bankstatus == 'cf':
            button3.config(image=imgoff)
            onoff[2]=1
        elif bankstatus == '7f':
            button3.config(image=imgon)
            onoff[3]=2
        elif bankstatus == '3f':
            button3.config(image=imgoff)
            onoff[3]=1
    
def SetBank2Value(bankstatus):
    if bankstatus != 'ff':
        if bankstatus == 'fd':
            button5.config(image=imgon)
            onoff[4]=2
        elif bankstatus == 'fc':
            button5.config(image=imgoff)
            onoff[4]=1
        elif bankstatus == 'f7':
            button6.config(image=imgon)
            onoff[5]=2
        elif bankstatus == 'f3':
            button6.config(image=imgoff)
            onoff[5]=1               
        elif bankstatus == 'df':
            button7.config(image=imgon)
            onoff[6]=2
        elif bankstatus == 'cf':
            button7.config(image=imgoff)
            onoff[6]=1
        elif bankstatus == '7f':
            button8.config(image=imgon)
            onoff[7]=2
        elif bankstatus == '3f':
            button8.config(image=imgoff)
            onoff[7]=1

def getBank(data):
    try:
        bank = str(data)
        bank = bank[13:-30]
        bank = int('0' + bank, 0)
        return bank
    except:
        return 999 #return an non exisant number

def read_from_port():
    connected = False
    try:
        while not connected:
            message = bus.recv()
            for msg in bus:
                PGN = getpgn(msg.arbitration_id)
                if PGN == 127501 or PGN == 127502 : 
                    print(str(PGN) + " : " + str(msg.arbitration_id) + " : " + str(msg.data ))
                    handle_data(PGN, msg.data)
                else:
                    print(str(PGN) + " : " + str(msg.arbitration_id) + " : " + str(msg.data ))
    except:
        exit()

    connected = True

def exit_app():
        connected = True
        bus.shutdown()
        time.sleep(0.3)
        os._exit
        time.sleep(0.1)
        app.destroy()
        exit()
    
app = Tk() 

# needed to be able to shutdown port
connected = False

PGN501 = 233966978
PGN502 = 233967275

# Switch Bank var's
BANK = 12 # BANK.to_bytes(1,'big') 
BLANK = bytearray(b'\xff\xff\xff\xff\xff')

# Switches 1-->8
#lower nibble of first byte is 2,1 upper nibble is 4,3
#lower nibble of 2nd byte is 6,5 upper nibble is 8,7
#the mask to leave a byte unchanged is ff or f if a nibble.
# BANKSTATUS = bytearray(b'\xff\xff')

os.system("sudo /sbin/ip link set can0 up type can bitrate 500000")
time.sleep(0.1) 

app.title("Reel Nauti Switching") 
#app.geometry("1920x1080") #Window dimensions

app.geometry("1200x700") #Window dimensions
app.configure(background='black')

#image size is 202x315 XxY
imgblank = PhotoImage(file = r"./images/blank.png")
imgon = PhotoImage(file = r"./images/on.png")
imgoff = PhotoImage(file = r"./images/off.png")

spacer = 20
btnw = 202
btnh = 315

PGN = any

# define new font
newfont = fnt.Font(family='Arial', size=22, weight=fnt.BOLD)

# internal button state array 0=uninitated, 1=off, 2=on
onoff = arr.array('i',[0,0,0,0,0,0,0,0]) # array starts at 0 using 0-7

# Create button 1
button1 = Button(app, text = "Engine\nRoom\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b1":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0)
button1.pack() 
button1.place(x=spacer , y=spacer)

# Create button 2
button2 = Button(app, text = "Courtesy\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b2":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button2.pack() 
button2.place(x=btnw + (2 * spacer) , y=spacer)

# Create button 3
button3 = Button(app, text = "Spreader\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b3":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button3.pack() 
button3.place(x=(2 *btnw) + (3 * spacer) , y=spacer)

# Create button 4
button4 = Button(app, text = "Under\nWater\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b4":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button4.pack() 
button4.place(x=(3 * btnw) + (4 * spacer) , y=spacer)

# Create button 5 on second row
button5 = Button(app, text = "Arch\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b5":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button5.pack() 
button5.place(x=spacer, y=btnh + (spacer * 2))

# Create button 6 on second row
button6 = Button(app, text = "Dash\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b6":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button6.pack() 
button6.place(x= btnw + (2 * spacer) , y=btnh + (spacer * 2))

# Create button 7 on second row
button7 = Button(app, text = "Cockpit\nLights", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b7":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button7.pack() 
button7.place(x= (2 * btnw) + (3 * spacer) , y=btnh + (spacer * 2))

# Create button 8 on second row
button8 = Button(app, text = "Salon\nHi-Hats", image=imgblank, borderwidth=0, font=newfont, compound = "center",
                 command=lambda m = "b8":button_click(m), cursor = "hand2",fg='white', bg='black', activebackground = "black",
                 activeforeground = "white", highlightbackground = "black", highlightcolor = "green", highlightthickness=0,)
button8.pack() 
button8.place(x= (3 * btnw) + (4 * spacer) , y=btnh + (spacer * 2))

# Create exit button - where to put it?
button9 = Button(app, text = "Exit", command=exit_app)
button9.pack() 
button9.place(x= (4 * btnw) + (5 * spacer) , y=btnh + (spacer * 2))

connected = False

try:
    bus = can.interface.Bus(channel='can0', bustype='socketcan')
    print('Ready')
except:
    print('Init of PICAN failed')

# thread to handle the can port
thread = threading.Thread(target=read_from_port)
thread.start()

# Mainloop that will run forever 
app.mainloop()