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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/*
------------
CVS : $Id: orbit.c,v 1.6 2004-05-23 12:53:54 giacomo Exp $
File: $File$
Revision: $Revision: 1.6 $
Last update: $Date: 2004-05-23 12:53:54 $
------------
*/
/*
* Copyright (C) 2000 Giorgio Buttazzo and Paolo Gai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/****************************************************************/
/* SIMULAZIONE DI MASSE CHE ORBITANO */
/****************************************************************/
#include <kernel/kern.h>
#include <semaphore.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <drivers/shark_fb26.h>
#include <drivers/shark_keyb26.h>
#define MAX 10 /* numero massimo pianeti */
#define XMAX 639 /* valore massimo coordinata X */
#define YMAX 479 /* valore massimo coordinata Y */
extern int vga16color
[16];
struct coord
{
double x
;
double y
;
};
int flen
; // file length
float mass
[MAX
]; /* vettore masse pianeti */
struct coord pos
[MAX
]; /* vettore posizioni attuali */
struct coord vel
[MAX
]; /* vettore velocita' iniziali */
int XGS
, YGS
; /* Coordinate centro spazio */
int RP
, RT
; /* raggio pianeta, raggio Terra */
int np
; /* numero attuale di pianeti */
float G
; /* Gravitazione Universale */
float tick
; /* tick di sistema */
float delta
; /* incremento temporale */
float scala
; /* fattore grafico di scala */
char fbuf
[1000] ="\
----------------------------------------------------\n\
period: 20000 wcet: 1000\n\
delta: 1. scala: 150.\n\
G: 6.6e-15\n\
r_pianeta: 4 r_Terra: 8\n\
X_centro: 320 Y_centro: 240\n\
------------------- pianeti ------------------------\n\
massa pos.x pos.y vel.x vel.y\n\
0: \t6.0e21 \t0. \t0. \t0. \t0.\n\
1: \t1.0e21 \t10000. \t8000. \t-60. \t0.\n\
2: \t1.0e8 \t5000. \t0. \t0. \t80.\n\
3: \t5.0e18 \t10000. \t8000. \t-50. \t0.\n\
4: \t1.0e9 \t10000. \t8000. \t-40. \t20.\n\
5: \t1.0e15 \t1000. \t5000. \t-80. \t0.\n\
6: \t1.0e5 \t1000. \t5000. \t-80. \t0.\n\
7: \t1.0e17 \t1000. \t5000. \t-80. \t0.\n\
8: \t1.0e5 \t1000. \t5000. \t-80. \t0.\n\
9: \t1.0e5 \t1000. \t5000. \t-80. \t0.\n\
10: \t1.0e5 \t1000. \t5000. \t-80. \t0.\n\
----------------------------------------------------\n";
// -------------------------------------------------------
// NOTA: %f o %lf significa double e %nf significa float
// -------------------------------------------------------
PID pid
;
int period
; /* task period */
int wcet
; /* task wcet */
sem_t mutex
; /* semaforo di mutua esclusione */
void get_par
(void);
/*--------------------------------------------------------------*/
int inside
(int x
, int y
)
{
return ((x
> RP
) && (x
< XMAX
-RP
) &&
(y
> RP
) && (y
< YMAX
-RP
));
}
/*--------------------------------------------------------------*/
TASK massa
(void *xxx
)
{
int i
= (int)xxx
; /* parametro del task */
int gx
, gy
; /* coordinate grafiche pallina */
int ox
, oy
; /* vecchia posizione pallina */
int j
;
int r
, col
; /* raggio e colore pianeta */
double dt
; /* incremento temporale */
double dist
=0.0, dx
, dy
; /* distanze pianeta-pianeta */
double dist0
=0.0; /* distanze pianeta-Terra */
double x
, y
; /* posizione del pianeta */
double vx
, vy
; /* velocita' del pianeta */
double ax
, ay
; /* accelerazione del pianeta */
double k
; /* variabile ausiliaria */
double arg
; /* variabile di appoggio */
x
= pos
[i
].
x; y
= pos
[i
].
y;
vx
= vel
[i
].
x; vy
= vel
[i
].
y;
ox
= XGS
+ x
/ scala
;
oy
= YGS
+ y
/ scala
;
dt
= delta
;
do {
x
= pos
[i
].
x;
y
= pos
[i
].
y;
ax
= ay
= 0.0;
for (j
=0; j
<np
; j
++) {
if (j
!= i
) {
dx
= pos
[j
].
x - x
;
dy
= pos
[j
].
y - y
;
arg
= dx
*dx
+ dy
*dy
;
dist
= sqrt(arg
);
if (dist
< RP
*scala
) dist
= RP
*scala
;
k
= G
* mass
[j
] / (dist
*dist
*dist
);
ax
+= k
* dx
;
ay
+= k
* dy
;
}
if (j
== 0) dist0
= dist
- (RP
+RT
)*scala
;
}
x
+= vx
*dt
+ 0.5*ax
*dt
*dt
;
y
+= vy
*dt
+ 0.5*ay
*dt
*dt
;
vx
+= ax
* dt
;
vy
+= ay
* dt
;
gx
= XGS
+ x
/ scala
;
gy
= YGS
+ y
/ scala
;
r
= RP
;
col
= i
+ 1;
sem_wait
(&mutex
);
grx_disc
(ox
,oy
,r
,vga16color
[0]);
grx_disc
(gx
,gy
,r
,vga16color
[col
]);
sem_post
(&mutex
);
pos
[i
].
x = x
; pos
[i
].
y = y
;
ox
= gx
; oy
= gy
;
task_endcycle
();
} while ((dist0
> 0) && inside
(gx
,gy
));
sem_wait
(&mutex
);
grx_disc
(ox
,oy
,r
,vga16color
[0]);
grx_disc
(XGS
,YGS
,RT
,vga16color
[12]);
grx_circle
(XGS
,YGS
,RT
,vga16color
[14]);
sem_post
(&mutex
);
return NULL
;
}
/*--------------------------------------------------------------*/
/* MAIN */
/*--------------------------------------------------------------*/
int main
()
{
HARD_TASK_MODEL m
;
char c
; /* carattere letto da tastiera */
sem_init
(&mutex
,0,1);
get_par
();
grx_disc
(XGS
,YGS
,RT
,vga16color
[12]);
grx_circle
(XGS
,YGS
,RT
,vga16color
[14]);
np
= 0;
do {
if (np
< MAX
-1) {
np
++;
hard_task_default_model
(m
);
hard_task_def_arg
(m
, (void *)np
);
hard_task_def_wcet
(m
, wcet
);
hard_task_def_mit
(m
, period
);
hard_task_def_usemath
(m
);
pid
= task_create
("massa", massa
, &m
, NULL
);
if (pid
== NIL
) {
sys_shutdown_message
("Could not create task");
sys_end
();
}
task_activate
(pid
);
}
c
= keyb_getch
(BLOCK
);
} while (c
!= ESC
);
sys_end
();
return 0;
}
/*------------------------------------------------------*/
/* file reading */
/*------------------------------------------------------*/
void read_file
(void)
{
int err
;
DOS_FILE
*fp
;
fp
= DOS_fopen
("orbit.dat","r");
if (!fp
) {
err
= DOS_error
();
cprintf
("Error %d opening myfile.txt...\n", err
);
flen
= 0;
return;
}
flen
= DOS_fread
(&fbuf
, 1, 1000, fp
);
cprintf
("Read %d bytes from orbit.dat\n", flen
);
DOS_fclose
(fp
);
}
/*------------------------------------------------------*/
/* get data from buffer */
/*------------------------------------------------------*/
void get_par
(void)
{
int x
= 0;
int i
;
float vx
, vy
, px
, py
;
char temp
[100];
flen
= strlen(fbuf
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%d", &period
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%d", &wcet
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &delta
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &scala
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &G
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%d", &RP
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%d", &RT
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%d", &XGS
);
while ((fbuf
[x
] != ':') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%d", &YGS
);
for (i
=0; i
<MAX
; i
++) {
while ((fbuf
[x
] != '\t') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &mass
[i
]);
while ((fbuf
[x
] != '\t') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &px
);
while ((fbuf
[x
] != '\t') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &py
);
while ((fbuf
[x
] != '\t') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &vx
);
while ((fbuf
[x
] != '\t') && (x
< flen
)) x
++;
x
++;
sscanf(&fbuf
[x
], "%f", &vy
);
sprintf(temp
,"[M = %f, Px = %f, Py = %f, Vx = %f, Vy = %f]",mass
[i
],px
,py
,vx
,vy
);
grx_text
(temp
, 10, 20+10*i
, vga16color
[15],0);
pos
[i
].
x = px
; pos
[i
].
y = py
;
vel
[i
].
x = vx
; vel
[i
].
y = vy
;
}
}
/*--------------------------------------------------------------*/