[assembleur]programmation

bonjour cher amis
je suis un debutant et j'ai chercher comment programmer une carte d'accisition avec 4 sortie et j'ai trouver ce code source j'ai compri un ptit peut les instruction mov ...mais j'arrive pas comprendre tout le programme j'aimerai bien que vous m'aidier avec un organigramme
merci boucoup de votre aide d'avance

Le programme en C intégrant l’assembleur .
#include <math.h>
#include "mex.h"

/* Output Arguments */
#define D_OUT plhs[0]

void adc4(
double data[]
)

{
int voie,voie1,voie2,voie3;
asm {
mov al,0x00
mov dx,0x378
out dx,al
mov al,0x00
mov dx,0x37a
out dx,al
mov al,0x0f
out dx,al
nop
nop
nop
mov al,0x00
out dx,al
mov dx,0x379
lop20:
in al,dx
test al,8
jnz lop20
lop10:
in al,dx
test al,8
jz lop10
mov al,0x00
mov dx,0x37a
out dx,al
nop
and al,0xf0
mov bl,al
mov cl,4
shr bl,cl
mov dx,0x378
mov al,0x01
out dx,al
mov dx,0x379
in al,dx
and al,0xf0
or al,bl
and eax,0x000000ff
mov voie,eax
}
data[0]=voie;
asm
{
mov al,0x10
mov dx,0x378
out dx,al
mov al,0x00
mov dx,0x37a
out dx,al
mov al,0x0f
out dx,al
nop
nop
nop
mov al,0x00
out dx,al
mov dx,0x379
lop21:
in al,dx
test al,8
jnz lop21
lop11:
in al,dx
test al,8
jz lop11
mov al,0x00
mov dx,0x37a
out dx,al
nop
and al,0xf0
mov bl,al
mov cl,4
shr bl,cl
mov dx,0x378
mov al,0x11
out dx,al
mov dx,0x379
in al,dx
and al,0xf0
or al,bl
and eax,0x000000ff
mov voie1,eax
}
data[1]=voie1;
asm
{
mov al,0x08
mov dx,0x378
out dx,al
mov al,0x00
mov dx,0x37a
out dx,al
mov al,0x0f
out dx,al
nop
nop
nop
mov al,0x00
out dx,al
mov dx,0x379
lop22:
in al,dx
test al,8
jnz lop22
lop12:
in al,dx
test al,8
jz lop12
mov al,0x00
mov dx,0x37a
out dx,al
nop
and al,0xf0
mov bl,al
mov cl,4
shr bl,cl
mov dx,0x378
mov al,0x09
out dx,al
mov dx,0x379
in al,dx
and al,0xf0
or al,bl
and eax,0x000000ff
mov voie2,eax
}
data[2]=voie2;
asm
{
mov al,0x18
mov dx,0x378
out dx,al
mov al,0x00
mov dx,0x37a
out dx,al
mov al,0x0f
out dx,al
nop
nop
nop
mov al,0x00
out dx,al
mov dx,0x379
lop23:
in al,dx
test al,8
jnz lop23
lop13:
in al,dx
test al,8
jz lop13
mov al,0x00
mov dx,0x37a
out dx,al
nop
and al,0xf0
mov bl,al
mov cl,4
shr bl,cl
mov dx,0x378
mov al,0x19
out dx,al
mov dx,0x379
in al,dx
and al,0xf0
or al,bl
and eax,0x000000ff
mov voie3,eax
}
data[3]=voie3;
return;
}

void mexFunction( int nlhs, mxArray *plhs[],
int nrhs, const mxArray*prhs[] )
{
double *data;
unsigned int m,n;
/* Check for proper number of arguments */
if (nrhs!=0) {
mexErrMsgTxt("ADC809 ne demande pas des arguments en entrée.");
} else if (nlhs>1) {
mexErrMsgTxt("ADC809 a un seul argument en sortie.");
}
m = 4;
n = 1;
/* Create a matrix for the return argument */
D_OUT = mxCreateDoubleMatrix(m, n, mxREAL);

/* Assign pointers to the various parameters */
data = mxGetPr(D_OUT);
/* Do the actual computations in a subroutine */
adc4(data);
return;
}