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'''Misc output related subpage of GenBoard/UnderDevelopment/FirmWare''' Also some general method (see interpretere below) to define functions for misc output actuation * WOT_OUTPUT_TPS_THRESHOLD should be specified in config_t or dropped (misc outputs there) * wot_output needs hysteresis * miscX_activity needs hysteresis ---- '''Interpreter''' There are more and more stuff that needs flexible configuration, without firmware recompile, eg. misc outputs. Currently condition is wired for most common function, RPM,MAP,TPS ranges I think we cannot avoid a simple language/interpreter. Maybe a postscipt-like (but binary) code: words of 16 bits that are * either push variable "..." to stack * or operation "..." that takes N variables from stack, operates on them and places result on stack --- Michael's Ideas... There are a few parts to this challenge. First of all it's necessary to cater to a potentially long list of functions. Adding canbus enabled switches allows for an impressive range of features. VSS encoders, clutch switches, ALS enable switches, boost knobs are all potential inputs. On the output side one can have as many outputs as there are spare channels. Potentially extra drivers could be available via CANbus. First the outputs... I assume at this point we're dealing with a finite number - limited by the number of spares you have. This could still number 8 or more. Outputs may potentially be switched based on a number of parameters. Here are a few features I thought up: fan control enable temp enable added steps to the IAC disable temp disable subtracted steps from the IAC Vtec control enable rpm enable temp enable MAP Disable RPM Disable MAP fuel pump (maybe pre-defined) prime time Tach signal (maybe pre-defined) tach divider PWM IAC frequency minimum duty maximum duty intercooler fan and/or intercooler water spray enable IAT temp enable added steps to the IAC disable IAT temp disable subtracted steps from the IAC Nitrous enable minimum RPM maximum RPM minimum TPS minimum MAP maximum MAP shift light minimum rpm maximum rpm misc output control minimum RPM maximum RPM minimum TPS maximum TPS minimum MAP maximum MAP Another sort of output may need to be driven from a table. TGV/TVIS/AVCS/IAB control, electronic throttle and others come to mind. For TGV/TVIS/AVCS/IAB and possibly iVTEC the computer may control offsetting one or more cams and/or adding to the lifts at different RPM and load combinations. Electronic throttle control will be the way of the future as more and more new cars are drive by wire. I suspect this will require a completely dedicated implementation. For the above the outputs are most likely to be PWM based. I can confirm that AVCS (on Subarus) is PWM controlled. I believe the same with the new i-VTEC found on hondas. Certain RPMs and MAP values require certain PWM outputs in order to aid in spooling the turbo or creating lower RPM torque. ---- '''Storage''' The code for doing these checks is fairly trivial. Efficient storage of the parameters is somewhat less trivial. A dynamic size for these functions would require a lot of work. First you would need a means of specifying the size of each record and secondly you would need a means of properly shuffling things around should changes be made. Anyone remember Norton Defrag? The current implementation is rather short sighted and wasteful. You pay the overhead even if you don't use a feature. Unfortunately this implementation is more difficult because of the dynamic memory space. Using static sizing is as wasteful or worse than the existing solution. There is lots of space in eeprom to store these but eeprom is a bad solution because it lacks any quick access method. As a result we are forced to read the values into RAM. Removing these from the 'C' table would free up about 30b of memory if the table size were reduced accordingly. Personally I would prefer to have them stuck in flash. This would provide quick reads where the parameters would not necessarily need to be stored in RAM. Unfortunately this brings about a challenge for updates. While technically possible each parameter would be limited to about 10,000 changes. We're probably okay with this. The other challenge is halting the processor long enough to perform an update without missing an ignition event or some other time sensitive event. While tuning I'm not sure if you really want to write your flash page 100 times as you adjust values. All in all I suspect we would need about 20*8 bytes of memory, be it flash or SRAM. --- If a '''block contains 8 instructions''' (16 bytes), that can be do more than the current misc1 misc2 implementation, basically enough for any function that comes to mind. The '''fixed size block makes the defragmentation issue go away''' (the same way they allocate fixed size pages in OS-es). Besides range checks and alike, there will be some complex functions as well. We can add a * "jump" instruction that makes it possible to use more than one 8-instruction blocks (even jump into the middle) * "conditional jump" makes it very powerful ---- '''Shiftlight''' We need to change shiftlight code a bit so the configured RPM treshold is compared againds RPM + dRPM/dt*0.5sec (not just RPM). This means the light (beeper, whatever connected) is activated somewhat earlier in gear1 and gear2 (but gearbox switches not needed).
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