MicroSquirt.com read only forum (Jan.15,2018)

I acquired a BDM programmer and found that I could communicate with the processor directly. The serial communication failure remained a mystery - reloading the software and using my prior settings - until I recalled that the failure occurred during the tuning process. I took a wild guess ...

Thanks Lance These routes have been explored. No success. I am acquiring a BDM programmer to see if I can reload the serial monitor. Will report here on my progress.

michael

I have a microsquirt Version 1.0 2007
While trying to tune - communication failed - I was able to reestablish by reloading processor code.

Communications failed again - have not been able to reestablish.

Have verified that 5v exists after the input power stage.

I cannot determine if the ...

When using the miniterm I get responses for S Q c however I get no response to - a - which I thought would return all variables in binary form. What is the proper protocol to query for the variables?

I have modified my crank processor to produce two signals 180 deg out of phase to simulate the engine running at 620 RPM 48.5 ms apart. One to opto+ one to vrin2+. Everything works as advertised. The rpm readout is correct - the microsquirt dual ingnition outputs are firing in sych with the inputs ...

Your calculation is correct however MT reports 134 RPM.

The software must be waiting until the count stated in your code below is satisified (I believe it wants 2 inputs/rev from at least the first input). Since I only provide one - twice the time would elapse thus half the RPM.

It is difficult ...

Hi Al

I will try to provide the pertinent information as to what I am doing.

Attached find a photo of logic analyzer output decoding a GM 7 tooth reluctor wheel with "signature" tooth as described in your manual.

First trace processed reluctor output - second trace logic to be input to opto ...

I am sending two firing signals 180 deg apart one to optoin and the other to vrin2. I have specified 0 teeth. Megatune RPM is exactly 1/2 my actual cranking RPM. Any suggestions?

I have reloaded the microsquirt code - the problems have disappeared. Thanks for your help.

Michael

Thanks for the explanation of wheel decoder logic.

My latest experiment - AVR microcontroller simulates a 36 tooth wheel 1 missing tooth skip 18 teeth 2ms per pulse/space 416 rpm. Works fine for 38 seconds - then the rpm display stops - time counting on real time display stops - very mysterious ...