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Old   February 5, 2015, 07:16
Default How to pass variable between macros
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Andrey Yakovchuk
Join Date: Nov 2012
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Hi! I am trying to implement PID controller in FAN-model and SIX-DOF solver. I use DEFINE_PROFILE macro to simulate time-varying thrust from fans, which depends on current centre of gravity position. So, I want to take from DEFINE_SDOF_PROPERTIES macro the centre of gravity and pass it to DEFINE_PROFILE macro, whithing wich the controller is to be implemented.

How do I ecxhange variables between macros? I try using pointer, it compiles well but crashes on initialisation with SEGMENTATION VIOLATION error. Maybe I need UDMs? If so, how do I implement it? I attach the code. Guys, please help! I have not enough experience in programming, so maybe it is simple issue.

#include "udf.h"
real *pY=0;

DEFINE_SDOF_PROPERTIES(PID_kopter, prop, dt, time, dtime)
real Y;

prop[SDOF_MASS] = 5;
prop[SDOF_IXX] = 10;
prop[SDOF_IYY] = 10;
prop[SDOF_IZZ] = 10;

Y = DT_CG(dt)[1];
printf ("\nPID_kopter: updated 6DOF properties, Y position: %f" Y );

DEFINE_PROFILE(fan_profile, t, i)
real x[ND_ND], VFAN, y;
face_t f;
y = *pY;

VFAN = 1;
if (y <= 0.6)
F_PROFILE(f,t,i) = -500*VFAN + 4500;
F_PROFILE(f,t,i) = 0;
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Old   February 5, 2015, 07:34
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François Grégoire
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Location: Laval University, Canada
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Instead of declaring a pointer, define a global variable that will be visible to all macros:
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