Instructions for 60-2 crankwheel with 1-pulse cam
Camsync is necessary for
- 5cyl (where wasted spark is not a good solution)
- Also necessary for real sequential ignition (properly used COP).
Cam-sync has been used with coil-type (primary-)trigger (which means ncyl evenly spaced pulses per camrot) for a long time. However, many likes to use camsync with 60-2 crankwheel, which is now possible.
AdvancedIgnition will finally take over (development branch), that also supports odd-fire-6.
notes for users
Implemented with 60-2 since 1.0.25 (experimental! uploaded to firmware dir but not released yet! use at your own risk!)
- another_trigger_tooth=18 (decimal 24)
- tooth_wheel=3A (decimal 58)
- don't forget to read, understand and apply GenBoard/Manual/InputTriggerCamSync
developer notes
The trick is when the missing tooth is detected.
- if cam_sync3 bit was flagged, reset tooth_cnt=0 and act as TW_MISSING
- otherwise (camsync not flagged), tooth_cnt+=3 (instead of +=1 or resetting). This is necessary to make up for the 2 teeth at the 60-2
That way tooth_cnt count up to almost 120.
Design decisions
Might be done in
- multitooth.c : independent of the current, operational coil-type + camsync code. This was implemented. Unfortunately multitooth.c was involved a bit with camsync processing, but the code is not too tangled.
- or timing.c : possibly merged with the current, operational coil-type + camsync code
might be configured in
- maybe in tooth_wheel upper 2 bits (not optimal, if we want the 135-crankteeth later)
- or in a dedicated secondary_trigger bit