Discussions

Telemetry - OpenLRS and APM

Posted by Jesper Rooth on November 19, 2011 at 1:54pm

I have been trying to get telemetry to work with my OpenLRS RX and TX. Been trying out different setups and baud rates but not got it to work.

The transparent serial bridge is working perfectly but when I try to connect the RX to the APM Telemetry port (port 3) I cannot connect via Mission Control. Running a serial monitor I can see traffic - ascii in the beginning saying something like "<startup_mode: ground>" and then binary. Seems to be ok... but not good enough to connect.

I think the problem might be related to bandwidth. OpenLRS supports 750 byte/seconds from the RX to TX. After looking at the documentation and source code I have not figured out how much data MAVLink protocol is configured to send per second.

Does anybody know?

Regards,
Jesper

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Replies

zmooth June 9, 2014 at 4:29am

@Martin

I see you merged 3.6.4 to your fork, but I'm having troubles compiling for DTFUHF DeluxeTx:

In file included from openLRSng.ino:111:
TX.h:5: error: 'UBRR0H' was not declared in this scope
TX.h:5: error: 'UBRR0L' was not declared in this scope
TX.h:5: error: 'UCSR0A' was not declared in this scope
TX.h:5: error: 'UCSR0B' was not declared in this scope

etc
- Matthias Badaire > zmooth August 27, 2014 at 11:32pm
  
  Ah.I am badzz... Sh*t , I have seen the error but no time to check. I will try today.
  - Martin > Matthias Badaire August 28, 2014 at 12:43am
    
    I've set aside some time for actually trying to rewrite my stuff without libraries etc. so it should be closer related to kah's original branch... I hope this will also sort out the issues you guys are having. @badzz: once I get it working properly could you test the deluxe Tx for us? I got none lying around :).
    Current status: able to do basic connection in mission planner data rate 2. 35% link quality because of mavlink radio status packet injection not working properly yet...
    As a side note I believe if someone needs original openlrsng to work with APM you could go with one of the "hidden" data rates (settable from CLI). It should work ok with 4, although there's a bug in the serial uplink (will post a PR soon to kah) which causes uplink bytes to get lost in the outgoing serial buffer from tx.
    - Matthias Badaire > Martin August 28, 2014 at 1:25am
      
      sure .. I can test the deluxe tx.
      
      If we can get kha to take a mavlink PR , you would be the hero for many people 8)
    - Jean-Marie PRIGENT > Martin August 28, 2014 at 12:51am
      
      Thanks Martin for your work !
  - Jean-Marie PRIGENT > Matthias Badaire August 27, 2014 at 11:47pm
    
    Ok I understand...no pb and thanks for your work to !
    
    here more info : Serial port successfully opened with ID: 15
    14:22:43 -- Module - OpenLRSng TX starting
    14:22:43 -- Requesting to enter bind mode
    14:22:43 -- PSP - Unknown command: 204
    14:22:45 -- Communication through Phoenix Serial Protocol was never established, connecting failed
    14:22:45 -- PSP - Unknown command: 204
    14:22:45 -- Serial port successfully closed
    
    To make it more easy to find, here the thread if necessary :
    
    http://www.rcgroups.com/forums/showthread.php?t=1913501&page=18...
- Matthias Badaire > zmooth August 27, 2014 at 3:16pm
  
  It was not compiling on deluxe tx but that's fixed on gitsly version.
  What means 'not working' ?
  - Jean-Marie PRIGENT > Matthias Badaire August 27, 2014 at 10:05pm
    
    Compilation is ok with 3.6.4 from gitsly but impossible to setup with CLI.
    I need Ppm out on port 6/ Channel 5.
    (This is perfectly workling with 3.6.4 master from Kha)
    
    I can't enter on setup mode (it's ok with 3.5 gitsly). I've seen on rc group 2 people with same pb (geofrancis and another Guy)
    
    I have test the special chrome configurator (baddz) but I've same error Geofrancis : 'configurator never ...' (I don't remember the exact message and I'm with my phone).
    
    Thanks for help !
- Matthias Badaire > zmooth June 17, 2014 at 1:48am
  
  in tx.h you will need to change that first line but I am not sure what to put.
  
  It works with FastSerialPort1(Serial1);
  
  then it does too big but if you do not need to change the packet size (new gitsly parameter , the rest can be modified through configurator chrome), you can disable the cli from the openlrsng.ino
  - Jean-Marie PRIGENT > Matthias Badaire August 27, 2014 at 6:17am
    
    H Matthias,
    
    I'm trying to have functionnal Mavlink telemetry with 3.6.4 from Gitsly (big thanks to him !) but only 3.5 working.
    
    (I'm testing OpenLRS Orange HK 1W with OpenLRS Orange HK 100 mW)
    
    Do you say we must change something here ?
    
    #ifdef COMPILE_TX
    #ifdef __AVR_ATmega32U4__
    FastSerialPort1 (TelemetrySerial);
    #else
    FastSerialPort0 (TelemetrySerial);
    #endif