MS2 development/coding for dummies

[elsp1991]

Hey guys I'm working for my Fsae team and i want to implement a traction control so i want to be able to change the advance on the run and cut some spark events if spark retard is not enough. And i was thinking if it is possible to do something wrong that could make ms2 unprogramable?

[gslender]

Hey guys I'm working for my Fsae team and i want to implement a traction control so i want to be able to change the advance on the run and cut some spark events if spark retard is not enough.

What you want to do is possible, but on an ms2 the big issue will be available inputs to detect when you've lost traction.

And i was thinking if it is possible to do something wrong that could make ms2 unprogramable?

It is, but you can just trip the boot jumper and reset the ms2 back to a state that will allow serial programming again.

I've had to rely on that a few times when I crash the CPU or do some code loops that stop serial interrupts from being active.

G

[elsp1991]

Ok this is the thing i want to do with MS2. An avr will produce a analog output. And i have some question

1. The thing is that i dont know the internal variable of adc7, do you know where i can find this info.
2. should i put this tile in several places or just before the end of the main loop? cause i notice that ms2 do launch in several lines??!!

3. user_value_1 = my spark retard
user_value_2 = adc prescaler in order to convert 0-1024 range to 0-50
(????adc7???) = adc7 input signal

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                                                //my code
user_value_1 = user_value_2*(????adc7???);

   if (user_value_1 >= 20) //spark retard is not enough cut some events
      {
      user_value_1 = 20;

      spk_cutx = 4;
      spk_cuty = 7;

      outpc.status2 |= status2_spkcut; //do spark cut with above x,y
      }

   else if (user_value_1 <= 20) //spark retard is enough dont need to cut events
      {
      outpc.status2 &= ~status2_spkcut; //disable spark cut
      }
              else if (user_value_1 <=0)
              {
              user_value_1 = 0;
              outpc.status2 &= ~status2_spkcut; //disable spark cut
              }

lsum += user_value_1;     
                                                  //end of my code




outpc.adv_deg = (int)lsum;  // Report advance before we fudge it

[m3ltd0wn]

take a look in megasquirt 1 and see how traction control/anti-rev is done, it is a crude implementation but it does it's job, too bad it didn't make it in ms2-extra code, it would be very usefull even if it was just rpm based.

[jsmcortina]

1. The thing is that i dont know the internal variable of adc7, do you know where i can find this info.

Example on how to search for stuff:

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[jsm@jsm2 ms2extra]$ grep -i adc7 *.c
ms2_extra_main.c:  retard based on ADC7 sensor.
ms2_extra_misc.c:            outpc.adc7 = ATD0DR7;
ms2_extra_misc.c:            tmpadc = outpc.adc7;
ms2_extra_misc.c:            tmpadc = outpc.adc7;
ms2_extra_misc.c:        txbuf.adc7 = outpc.adc7;

James

[Wergilius]

i use this editor for my small changes in the code, "find in files" and nice color coding makes life a little more easy.
http://www.editplus.com/

[Peter Florance]

Anyway, I try to follow the instruction but having entered the tar command with the path to get to the tools.tar.gz file, nothing appears to happen. I don't know if anything ought to happen, but nothing does.

If it didn't give an error message then it worked.
If you prefer to see tons of output, use:

cd /
tar xvfz <path>/tools.tar.gz

To see if it extracted:
ls -l /usr/bin/m9s*

James

Is that what one would do in Linux? I'd like to compile some code to test CANBus in BMW setup (apparently different ID's and multipliers).
When I tried above I got a bunch of errors, the last few being:

tar: usr/m68hc11-elf/lib/m9s12x/libm.a: Cannot open: No such file or directory
usr/m68hc11-elf/lib/m9s12x/libbcc.a
tar: usr/m68hc11-elf/lib/m9s12x/libbcc.a: Cannot open: No such file or directory
usr/m68hc11-elf/lib/libbcc.a
tar: usr/m68hc11-elf/lib/libbcc.a: Cannot open: No such file or directory
tar: Exiting with failure status due to previous errors

I'm really pretty much an idiot in Linux.

[robs]

Not exactly sure what's wrong. A couple of things:

1. you must be root to write to these directories. (either use sudo before the tar command or do "sudo su -" to log in as root full time).
2. if you have put the tools.tar.gz file in /tmp, the commands you want to type are:

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cd /
tar xvfz /tmp/tools.tar.gz

You should then see a list of the various files and directories as they are created.

All that said, the error messages don't really look like you've got a problem with either of these things. Just can't think of anything else to suggest.

Have fun,

Rob.

[Peter Florance]

I'll try that.
Thanks!

[jsmcortina]

I'd also suggest that you use the current build tools release and see the instructions it includes.

http://www.msextra.com/tools

James