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+-- Forum: OpenPlotter (https://forum.openmarine.net/forumdisplay.php?fid=1)
+--- Forum: General discussion (https://forum.openmarine.net/forumdisplay.php?fid=2)
+--- Thread: Server Hardware for openplotter? (/showthread.php?tid=1807)
RE: Server Hardware for openplotter? - glowntiger - 2020-07-30
Hi,
seems to be a bug in the Linux Kernel / DT-overlays.
I have opended an issue. Now we have to wayt until the developer fix it. It isn´t an issue in the OP-App or the board.
I cannot do anything at the moment. Hope the developer fix it fastly... ;-).
Until this happened, do not update the Kernel over 5.4 or if you have done this downgrade to under 5.4... ;-)
https://github.com/raspberrypi/linux/issues/3765
Thomas
RE: Server Hardware for openplotter? - glowntiger - 2020-08-05
The issue is fixed and should be released with the next stable update of your Pi. I let you know...
https://github.com/raspberrypi/linux/issues/3765
RE: Server Hardware for openplotter? - flybob - 2020-08-05
I had the same issue a few weeks back, solved by reinstall of MCS app.
It broke when I updated Moitessier HAT and crashed a lot of i2c stuff...
Thomas;
Would you expect the Seatalk1 input to work better with a PullUp connected to it?
I'm not sure what's on the MCS board so would it make a difference you beleive?
Also since you completed the magic with ST1 input, are you considering making an output as well?
RE: Server Hardware for openplotter? - glowntiger - 2020-08-06
Hi flybob,
this issue cant be solve by reinstall the MCS App. Its an linux issue in the raspberry firmware.
I have testet now many st1 devices without any issues. You find the wiring in the st1 git folder. You can try to use a 10KOhm Resistor in series to the MCS Input.
At the Moment i have not planed an output because there is no software site availible at the Moment. The Hardware is easy, but you need a script witch translate all the sentences....
RE: Server Hardware for openplotter? - flybob - 2020-08-06
(2020-08-06, 08:11 AM)glowntiger Wrote: Hi flybob,
this issue cant be solve by reinstall the MCS App. Its an linux issue in the raspberry firmware.
I have testet now many st1 devices without any issues. You find the wiring in the st1 git folder. You can try to use a 10KOhm Resistor in series to the MCS Input.
At the Moment i have not planed an output because there is no software site availible at the Moment. The Hardware is easy, but you need a script witch translate all the sentences....
I'm thinking about $STALK sentences only, into ST1. So not creating all the sentences but enable other scripts to create $STALK that are created into ST1.
That way it would be possible for many available scripts to communicate.
Example:
https://opencpn.org/wiki/dokuwiki/doku.php?id=opencpn:developer_manual:plugins:beta_plugins:autopilot_rm_pi
RE: Server Hardware for openplotter? - Max1947 - 2020-08-14
(2020-08-05, 12:24 PM)glowntiger Wrote: The issue is fixed and should be released with the next stable update of your Pi. I let you know...
https://github.com/raspberrypi/linux/issues/3765
Hello Thomas and good mid-August. With the latest Pi kernel your card is back in shape too:https://i.imgur.com/7oHoji4.png
RE: Server Hardware for openplotter? - flybob - 2020-08-19
Thanks again for a great product Thomas!
You mentioned a while ago that the hardware part for having a ST1 output was the easy part, can you share your ideas on that?
Developing a script that translates $STALK diagrams would be quite easy from my part - so please share your thoughts on the HW side.
There is quite a bit of work done already regarding the general diagram conversions as well.
https://blog.arribasail.com/2015/08/seatalk-using-arduino.html
https://bitbucket.org/scruzin/seatalk/src/master/
RE: Server Hardware for openplotter? - glowntiger - 2020-08-20
Hi flybob,
at the Moment i have several ideas to integrate this.
1. Also a bitbanging output on the Pi (pigpio did not support this at the Moment)
2. A microcontroller as an add on for the MCS which directly translate st1 <=> nmea0183
3. The Sc16is752 is able to work in 9bit mode. But the actualy dt-overlay for the pi did not support this. There are changes on the driver nedable.
At the Moment I prefer 3. But I have to less time to work on this because its much software work. The hardwere for testing I have here.. ;-)
https://www.nxp.com/docs/en/data-sheet/SC16IS740_750_760.pdf
RE: Server Hardware for openplotter? - flybob - 2020-08-20
Ok,
I'm looking at Marco Bergmans code and wondering if it can help, as he manages sending (but not generic $STALK though), using only regular GPIO.
https://github.com/marcobergman/
Code:
def write_seatalk (xx, yy):
# thanks to http://www.thomasknauf.de/seatalk.htm
with serial.Serial() as ser:
ser.baudrate = 4800
ser.port = '/dev/serial0'
ser.stopbits=serial.STOPBITS_ONE
ser.bytesize=serial.EIGHTBITS
ser.open()
ser.parity = serial.PARITY_MARK
ser.write(b'\x86')
ser.parity = serial.PARITY_SPACE
ser.write(b'\x11' + chr(int(xx, 16)) + chr(int(yy, 16)))
ser.close()RE: Server Hardware for openplotter? - MatsA - 2020-08-20
There is a HW solution http://www.thomasknauf.de/rap/seatalk3.htm#Bid which I think will work connected direct to a GPIO out pin, but the program must handle the inverted output.
Another way is to put a transistor driving an optocoupler if You want the added safety.
And just a thought, the program must handle collisions......