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Title: ME7 Relocating KFZW outside of 810000-81FFFF Post by: TijnCU on April 06, 2017, 01:08:21 AM Hey all, for a project I have been trying to relocate the KFZW maps to the end of the file (mapswitching alternative tables).
One problem that I encountered was, that while most lookup routines in the ecu use an offset-multiplier lookup routine (that allows you to put the maps everywhere you like without further modifications), KFZW is using a different lookup routine that only takes the offset and therefore limits your locations to 810000 through 81FFFF. In some ecu's, I have found enough space in this area to put 4 extra tables, but in others it is not possible. For this example, the KFZW map starting adress is put in r12 Here is what I did last night to solve this: - I have copied the whole lookup routine first. - I added extp r11, #1 (insert custom multiplier in this register of choice somewhere in the code) in every line BEFORE anything that is related to "[r12]" - fix relative jumps accordingly - produce binary and insert in free space. I chose to keep the offset the same, but at the end of the file (example: from original ROM adress 0078B8 I located this new routine at 8F78B8 in the flash. This is a very small change in the original code call, to keep things clean. the result I intended with this is: You can add switching conditions in the new subroutine, to have the correct multiplier inside of r11 that suits your map location. (or when you use switched ram like me, just insert ram adress and include the multiplier in your switch code) You can therefore relocate your KFZW maps at the same offset but different multiplier to have minimal code changes. Example: KFZW1 is at 812850. This is multiplier 204h offset 2850. Alternative multipliers are 228h (KFZW1_2 @ 8A2850) and 229h (KFZW1_3 @ 8A6850) Any thoughts, comments or feedback on this approach is welcome. I have tested this on the bench and it worked, will test in my car later. Code: KFZW MODIFIED lookup routine // Add r11 multiplier in code. Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: fknbrkn on April 06, 2017, 04:24:48 AM you can move all kfzw maps into the new segment with new lookup routine
no need to change extp (or exts) value everytime in that case Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: TijnCU on April 06, 2017, 04:32:01 AM True, but then you need to modify the offset if you have multiple maps. It comes down to the same thing, or do you mean something else?
Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: fknbrkn on April 06, 2017, 05:19:37 AM something like that
sorry for syntax, last time i do that a year ago :) lets imagine we have only one kfzw and with multimap routine we call it kfzw1 and kfzw2 *stock kfzw mov r12, .. ; stock values irrelevant now mov r13, .. calls <new routine> *new routine at 0xB0000 or something like movbz r4, current_map ; cmpb rl4, #1 jmpr cc_z, loc_kfzw1 cmpb rl4, #2 jmpr cc_z, loc_kfzw2 jmpr cc_uc, loc_kfzw1 ; just for safety loc_kfzw1: mov r12, <kfzw1> mov r13, <kfzw1 axis> ... calls loc_kfzwMATH jmpr cc_uc, loc_end loc_kfzw2: <all the same with different r12, r13 values for kfzw2 location> ... loc_kfzwMATH: <from your post> extp #22C, #1 ; now we always at 22C ROM:78B8 movb rl2, [r13] ROM:78BA movbz r13, rl2 ROM:78BC mov r1, r14 ROM:78BE movbz r1, rh1 ROM:78C0 mulu r1, r13 ROM:78C2 mov r1, word_FE0E ROM:78C6 add r12, r1 ROM:78C8 mov r1, r15 ROM:78CA movbz r1, rh1 ROM:78CC add r12, r1 extp #22C, #1 ROM:78CE movb rl2, [r12] etc ... rets loc_end: <some stuff or just> rets Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: TijnCU on April 06, 2017, 06:44:20 AM Yes, I understand. My multimap function creates an array of ram variables containing the adresses, so I call the switch routine once in the binary and there all changed maps get put in ram adresses according to the mapset. These ram adresses are then placed instead of the original offset adresses (for example kfzw was mov r12, #2850h but in my file it says mov r12, word_381234. It is very compact code and you have all of he mapset in 1 place. In my own file I use only kfzw1 and 2 because I have no vvt and no need for more timing maps, but with vvt and 3 mapsets space gets scarce :)
Maybe that clarifies why I chose to work with a variable in this routine, but I agree with you for only kfzw change a fixed routine is simpler. Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: TijnCU on April 14, 2017, 11:49:19 AM Just for feedback, this custom lookup routine works perfect. I have been driving around with relocated kfzw maps for my lpg fueling the past week. Hope it is of use for somebody else :)
Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: fknbrkn on April 14, 2017, 04:40:05 PM next step - cruise control switching and tacho indication via can-bus :)
Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: TijnCU on April 15, 2017, 01:08:46 PM Hehe already have cruise map switching next to automatic switching from rear o2 signal for lpg ;) next step replace turbo for bigger version :D
Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: rogerius on January 02, 2020, 05:54:18 AM next step - cruise control switching and tacho indication via can-bus :) I do not want to scatter info, if provided...so I will ask here:For the "tacho indication", is it possible to avoid getting the beeps for "alternator workshop", the message for "oil pressure low" and "AC compressor fan" ON? I hate it to ask openly, but have no idea how/if possible at all, to achieve this. Maybe somebody knowledgeable can say if it is at all possible and maybe a clue for "how" ? Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: prj on January 02, 2020, 09:25:20 AM All these things have nothing to do with the ECU, it's based on the cluster.
Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: rogerius on January 02, 2020, 10:10:49 AM All these things have nothing to do with the ECU, it's based on the cluster. So has it been done via the cluster? I hope it is not a dead end!Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: prj on January 02, 2020, 10:15:01 AM Via cluster as much as possible and via maybe simulating some signals or something.
All those notifications you are talking about - ECU does not know anything about it. It's 100% in the cluster. I don't know enough about clusters to tell you if it's possible to do some eeprom hackery there to switch the alerts on or off, and either way it has nothing to do with topic at hand. Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: rogerius on January 02, 2020, 10:38:23 AM Via cluster as much as possible and via maybe simulating some signals or something. Thank you!All those notifications you are talking about - ECU does not know anything about it. It's 100% in the cluster. I don't know enough about clusters to tell you if it's possible to do some eeprom hackery there to switch the alerts on or off, and either way it has nothing to do with topic at hand. I will not clutter this topic anymore. Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: fknbrkn on January 02, 2020, 10:15:51 PM I do not want to scatter info, if provided...so I will ask here: For the "tacho indication", is it possible to avoid getting the beeps for "alternator workshop", the message for "oil pressure low" and "AC compressor fan" ON? I hate it to ask openly, but have no idea how/if possible at all, to achieve this. Maybe somebody knowledgeable can say if it is at all possible and maybe a clue for "how" ? Do your thing when engine is running Title: Re: ME7 Relocating KFZW outside of 810000-81FFFF Post by: rogerius on January 03, 2020, 12:11:01 AM Do your thing when engine is running I have PMd you a video. Have u seen it? Do you mean to change the mapswitching conditions from "key on engine off' to "engine idle, speed <3km/h" ? |