Model engine CDI Autoadvance

[c_moore]

Thanks.I don't need a ignition system. Just some help with the
Auto advance.

[pedja089]

Look here
http://www.sportdevices.com/ignition...n.htm#download
You have example in asm and C.

[Acetronics2]

Thanks.I don't need a ignition system. Just some help with the
Auto advance.

All the CDI devices I've seen work with retrieve tables ...

AND you can get the curves you want.

and can't seem to get the curve I want.

Could you explain what's wrong for you ???

Alain

[c_moore]

Thanks Pedja089,

I tried it. I even went so far as to download a demo version of CCS and it doesn't work.

Alain,

OK what the code does is measure the time the input is low using TMR0 and based on that value uses a lookup table to get a delay. the problem is that creating a delay table that will work like I want is causing me to go crazy. The other thing is that I am limited to a narrow range of rpm. for example if I set the tmr0 prescale to 32:1 then I am limited to a rpm range of about 1300 to 4000. That fine.But While starting I need to measure the "dwell" or the time the input is low at 200 rpm. With that prescale tmr0 overflows. One solution I have come up with is set the Tmr0 prescale to 256:1 and at startup(200 rpm) upto 400 rpm measure the time the input is high. After 400 measure the time the input is low. Only problem with that is I can't seem to figure out how to do it. Any advice is greatly appreciated.

[c_moore]

Does anyone have any ideas?