The story of Genboard v3.2 #204
It has seen use in a Volvo PV : MembersPage/MattiasSandgren/VolvoPV
It never worked quite ok on that car, blew a few injector FETs and drivers.. long story. Emil sent the board off to be repaired with new FETs and FET drivers, and it was never tested with anything connected to a FET after that. Gustav bought the board and tested it on his SAAB, ignition only, and it worked very well.
When it was time to try injector it didn't turn out too well. As soon as the power was turned on, the injector outputs went active by default, instead of the normally inactive state. The function was inverted and the PA0 - PA07 pins are all set high (5.0 VCC).
The problem : LM5111-1M (double non-inverting)
What was never clear was the relationship between :
- Genboard hardware (FET drivers)
- Bootloader (that loads the VEMS firmware)
- VEMS firmware (application)
From what we (Mattias and Pelle) have deduced, one simply must have a firmware/application compiled for the type of FET driver on the board, this information is only given by the information that is compiled into the firmware/application.
The bootloader sets the outputs to safe defaults depending on what FET drivers are mounted. That's all it does, and only in case the firmware/application can't be started (bad flash). This implies that the firmware/application has the information about the type of FET driver on the board, it must be compiled in to treat the outputs correctly.
We have replaced the non-inverting drivers with regular MC33151D inverting drivers (that are supported by VEMS firmware/application code).
We have only bench tested the outputs with 0.5 A loads, the true test is only days away.
This trigger wheel (2 teeth on iron/steel disc)is in use, works fine.
Here is the car, work in progress, just painted after all body and chassis work:
