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ardupilot/libraries/AP_Scripting/drivers/EFI_NMEA2k.md
Andrew Tridgell 842a4f507b AP_Scripting: added NMEA 2000 EFI driver 
this has been tested on a marine engine, and correctly produces key
telemetry data

the NMEA_2000.lua module is broken out to make it easier to add other
NMEA 2000 based drivers
2024-07-06 07:19:25 +10:00

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NMEA 2000 EFI driver

This driver implements support for marine EFI systems using NMEA 2000 CAN messages.

Parameters

The script used the following parameters:

EFI_2K_ENABLE

this must be set to 1 to enable the driver

EFI_2K_OPTIONS

This sets options for the driver. Currently the only option is to set EFI_2K_OPTIONS to 1 to enable logging of the raw CAN frames for debugging purposes.

Operation

This driver should be loaded by placing the lua script in the APM/SCRIPTS directory on the microSD card, which can be done either directly or via MAVFTP. The NMEA_2000.lua module from AP_Scripting/modules/ also needs to be put in the APM/SCRIPTS/MODULES directory.

The following key parameters should be set:

  • SCR_ENABLE should be set to 1
  • EFI_TYPE should be set to 7
  • EFI_2K_ENABLE should be set to 1
  • EFI_2K_CANDRV needs to be set to the CAN driver number
  • CAN_Pn_BITRATE needs to be set to 250000
  • CAN_Dn_PROTOOCOL needs to be set to 10 for scripting

then the flight controller should rebooted and parameters should be refreshed.

Once loaded the EFI_2K_ENABLE parameters will appear and should be set according to the parameter list above.

The GCS will receive EFI_STATUS MAVLink messages which includes RPM, cylinder head temperature, exhaust gas temperature, injection timing, engine load, fuel consumption rate, throttle position atmospheric pressure and ignition voltage.