How to create a custom trigger decoder (Rover K series)

Hi Wouter,

The repository you looked at might just contain application code. I will update the repositories in the next few days so you can get started if you would like.

At this point the Rabbit ECU is 360 crank degrees oriented. So batch fire wasted spark for the next few months.

To set up the trigger pattern you just need to pass in an array of 'teeth event times' that represent your trigger.

The pattern is just ratiometric to fit within the range 0 - 0x10000 (0 - 65536).

For example your Rover pattern would be: {0,1820,3640,5461,7281,9102,10922,12743,14563,16384,18204,21845,23665,27306,29127,30947,32768,34588,36408,38229,40049,41870,43690,45511,47331,49152,50972,54613,56433,58254,61895,63715}

A 6 degree 'gap' is 1820 'ticks'. So in the array you should mostly see deltas of 1820 with the odd 3640 'gap tick' where the missing teeth are.

The array is stored in the user setting "Primary Trigger Table", declared uint16 aUserPrimaryTriggerTable[80] in usercal.h.

To make the setup call use the service call:

USER_vSVC(SYSAPI_enSetupCrankTriggerEdgePattern, (void*)&USERCAL_stRAMCAL.aUserPrimaryTriggerTable[0], (void*)&boFirstRising, (void*)&enEdgePolarity);

When this call is made the array is parsed and stored in the CEM module and a phase lock algorithm will run to determine the crank position.

There is a similar sync points array that controls at which points timing events will occur.

So you would select 4 points (recommended) from the above array that are 90 crank degrees apart where you wish a timing callback to occur.

Hope this helps please look out for the code updates shortly at this URL github.com/RabbitECUProject/RabbitECUOpenHALTrunk.

Matthew