/* Anzeigen der SIO Register */
/* Datei sioshow.c
Aufruf: sioshow n (n = 1 -4) */

#include <stdio.h>
#include <stdlib.h>
#include <dos.h>

union
{
int takti;
char taktc[2];
} takt;
enum sioregs{DATA, IER, IIR, LCR, MCR, LSR, MSR, SRC};
enum picregs{IMR=0x21,OCW1=0x21,OCW2=0x20,OCW3=0x20};

static int sioadr[4]= {0x3f8,0x2f8,0x3e8,0x2e8};
static char *name[]= {"Data","Int Enable","Int Ident",
	"Line Control","Modem Control","Line Status",
	"Modem Status","Scratch"};
void usage (char * arg)
{
fprintf (stderr,
   "\n\nAufruf:%s comX\nX zwischen 1 und 4\n",arg);
exit (2);
}

int main (int argc, char **argv)
{
unsigned int i,com;
char y;
if (argc != 2)
   usage(argv[0]);
com = atoi (argv[1]);
if (com <= 0 || com > 4)
   usage (argv[0]);
printf("\n\nAusgabe der Register von COM%d\n",com);
y = inportb(sioadr[com-1]+LCR);
y = y | 0x80;
outportb (sioadr[com-1] + LCR, y);
takt.taktc[0] = inportb(sioadr[com-1] +DATA);
takt.taktc[1] = inportb (sioadr[com -1] + IER);
y = inportb(sioadr[com-1]+LCR);
y = y & ~0x80;
outportb (sioadr[com-1] + LCR, y);
printf ("\n_bertragungsgeschwindigkeit = %d",(int) (115200L / takt.takti));

for (i = 0; i <8; i++)
  printf("\nReg. %4x : %02x %s",sioadr[com-1]+i,
	inportb (sioadr[com-1]+i), name[i]);
putchar('\n');
return 0;
}