Allow user to select dive mode (including PSCR)

[Robert Helling]

Hi,

first of all, here are more patches towards the PSCR mode:


> On 12.01.2015, at 12:25, Davide DB <dbdavide at gmail.com> wrote:
> 
> Hi Robert,
> 
> Could you shed some light on how to use pSCR feature?

In logbook mode: Just turn it on using the combo box.

It implicitly also adds a set-point change at t=0 to the default stepping for CCR mode and 0 for all other modes. Similarly in planner.

> Which formula did you use?

The steady state formula. You find in dive.c lines 1689ff

		if (divemode == PSCR) { /* The steady state approximation should be good enough */
			pressures->o2 = get_o2(mix) / 1000.0 * amb_pressure - (1.0 - get_o2(mix) / 1000.0) * prefs.o2consumption / (sac * prefs.pscr_ratio / 1000.0);
			pressures->he = (amb_pressure - pressures->o2) * get_he(mix) / (1000.0 - get_o2(mix));
			pressures->n2 = (amb_pressure - pressures->o2) * (1000 - get_o2(mix) - get_he(mix)) / (1000.0 - get_o2(mix));
		} else {

> Where I set needed constants?

Currently, there is no UI to set them unfortunately, there is only subsurfacestartup.c

	.o2consumption = 720,
	.pscr_ratio = 100,


The first is the O2 metabolization in ml/min the second the drop ration (in permille).
> 
> I downloaded latest daily and I tried to set pSCR on one of my simplest dive.
> 
> In the attachment before/after of the oxygen graph.

Could you try again? If it is still that strange, we need to look at the SAC calculation. Which gives me an idea. Too bad, I have to run. Could you mail me a file with that dive?

Thanks
Robert


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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
                      Scientific Coordinator
                      Ludwig Maximilians Universitaet Muenchen, Dept. Physik
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