APM MavLink to FrSky X8R S.Port converter

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- - Mike Machado > Mike Machado February 10, 2014 at 9:44pm
    
    I now see the teensy3 is not based on the atmega chip so it will take a little extra work, but it should be possible. I found the ATMega hardware UART cannot do inverted mode, but the SoftSerial as of 1.0 is much more reliable, and most importantly, can do inverted signaling.
    
    Your code is much simpler than the code to emulate the old hub protocol, so I am excited we should be able to get this going on the mavboard pretty easily.
    
    Also, the new version of my board has 2 extra digital and 2 extra analog pins broken out as pins on the edge, in addition to the RC connector (that will connect to the s.bus port), so if one wanted to attach sensors and devices and have that data feed back over the s.bus telemetry, it should be pretty easy.
    - Glenn Gregory > Mike Machado February 14, 2014 at 11:40pm
      
      Hi Mike,
      
      Just a note I tried porting this to a ATMega168 (one of the original Ardupilot boards!). I can confirm that the SoftSerial does do inverted signalling. I was able to successfully able to get the ATMega talking to the FrSky X8R with a few minor mods to Rolfs code and I was able to get telemetry data on my Taranis (from hardcoded values written in code). However I could not enable the Mavlink code to work successfully. I believe I was getting overflow problems with the limited memory on the 168. I didn't get around to looking into GCS_MAVLink.h file to see if I could 'trim' it down.
      
      I assume you're using the ATMega328? Did you have any overflow issues?
      
      Let me know how you go!
Tracy DeWitt February 9, 2014 at 11:05am

Having problem compiling code. Sorry never done this before. when I try to compile MavLink_FrSkySPort I get this: MavLink_FrSkySPort.ino:47:25: fatal error: GCS_MAVLink.h: No such file or directory
compilation terminated

when I try to compile FrSkySPort.h I get this:

MavLink_FrSkySPort.ino:47:25: fatal error: GCS_MAVLink.h: No such file or directory
compilation terminated.

Which code(s) do I compile and load? How?

Thanks
- Rolf Blomgren > Tracy DeWitt February 9, 2014 at 12:17pm
  
  It's simple...do like this:
  
  1. Download and extract the MavLink_FrSkySPort_1.2.zip file (for example. to your desktop)
  
  2. Open Arduino software and in menu File/Preference change the sketchbook location to the place you extracted the .zip file, press Ok
  
  3. Restart Arduino and in the menu File/Sketchbook select MavLink_SkySPort
  
  4. Compile and transfer to Teensy
  
  ( You must have installed the Teensy extension for Arduino http://www.pjrc.com/teensy/td_download.html )
  - Andrew Scerbina > Rolf Blomgren March 10, 2014 at 3:41pm
    
    Hi Rolf,
    
    I followed your instructions, but always get errors compiling. I have also tried adding the AP_HAL and GCS_MAVLink libraries manually into the libraries folder and including it. Always get errors, such as
    
    MavLink_FrSkySPort.ino: In function 'void setup()':
    MavLink_FrSkySPort:122: error: 'Serial2' was not declared in this scope
    MavLink_FrSkySPort.ino: In function 'void loop()':
    MavLink_FrSkySPort:150: error: 'Serial2' was not declared in this scope
    MavLink_FrSkySPort.ino: In function 'void _MavLink_receive()':
    MavLink_FrSkySPort:188: error: 'Serial2' was not declared in this scope
    FrSkySPort.ino: In function 'void FrSkySPort_Init()':
    FrSkySPort:19: error: 'Serial1' was not declared in this scope
    FrSkySPort:20: error: 'UART0_C3' was not declared in this scope
    ...................
    
    ...................
    
    I have no idea what I am doing wrong. I am surprised no one else had the issues compiling. Any help would be greatly appreciated.
    
    Thank you!
    - Kent Kuhler > Andrew Scerbina March 10, 2014 at 7:31pm
      
      I think I had that issue at first. Make sure you have the board set to Teensy 3.1. In the Arduino applications go to tools->board and select Teensy 3.1. You may even have to restart to get it to work
      - Garrett Min > Kent Kuhler September 16, 2014 at 4:06am
        
        ENQUIRY AFTER VERIFY/COMPILE:
        
        1. PLEASE PRESS THE RESET BUTTON ON TEENSY TO UPLOAD SKETCH.
        
        ON MY MINI PRO I PRESS THE RESET BUTTON & THE TEENSY LOADER DOES NOTHING WHILE MINIPRO BLINKS.
        
        SUGGESTIONS?
      - Andrew Scerbina > Kent Kuhler March 11, 2014 at 5:05am
        
        Thank you Kent. That worked!!!
  - Tracy DeWitt > Rolf Blomgren February 9, 2014 at 3:56pm
    
    Rolf, You are the man. Got it.
    
    Thanks
    - Artem > Tracy DeWitt February 9, 2014 at 8:56pm
      
      Hey , I get the same error, however I followed the above instructions to the point. what was wrong with your setup?

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APM MavLink to FrSky X8R S.Port converter

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