MX844 datasheet(13/21 Pages) IXYS

13 / 21 page

MX844

08/25/06

Drawing No. 084423

www.claremicronix.com

MX844

IXYS

/* setup the com1 port */

outp(0x3fb,0x83);

/* 8 bits no parity, DLAB=1 */

outp(0x3f9,0);

/* upper divisor = 0 */

/*outp(0x3f8,4);*/

/* lower divisor = 4 (28800 baud) */

outp(0x3f8,3);

/* lower divisor = 3 (38400 baud) */

outp(0x3fc,1);

/* DTR +V, RTS -V */

outp(0x3fb,3);

/* DLAB = 0 */

/* open the output log file */

inf = fopen("meter.log","w");

/* initialize arrays */

for(i=0;i<np;i++)

{

ad[i] = 0;

ad2[i] = 0;

n[i] = 0;

n2[i] = 0;

}

for(i=0;i<4*np;i++) d[i] = 0;

/* start data acquisition from MX844 */

lost = 1;

while(lost == 1)

{

/* synchronize to MX844 async data stream */

/* find n0,n1 = 00 and n2,n3 = 00 */

twoz = 0;

while (twoz == 0)

{

onez = 0;

/* read bytes until n0,n1 = 00 */

while (onez == 0)

{

w = 0;

while ((inp(0x3fd) & 1) == 0) {w=1;} /*wait for data ready*/

d[0] = inp(0x3f8);

if((d[0] & 0x00c0) == 0) onez = 1;

}

/* read the next byte */

w = 0;

while ((inp(0x3fd) & 1) == 0) {w=1;}

/* wait for data ready */

d[1] = inp(0x3f8);

if((d[1] & 0x00c0) == 0) twoz = 1;

else /* change "phase" */

{

w = 0;

while ((inp(0x3fd) & 1) == 0) {w=1;} /*wait for data ready*/

d[0] = inp(0x3f8);

}

} /* end twoz */

m=0;

/* read the actual data */

for(i=2;i<4*np;i++)

{

w = 0;

while ((inp(0x3fd) & 1) == 0) {w=1;} /*wait for data ready */

d[i] = inp(0x3f8);

if(w==0) m++;

/* printf("\n%02X

%1d",d[i],w); */

}

/* check for loss of sync in the data */

lost = 0;

for(i=0;i<np;i++)

{

m = ((0xc0 & d[2*i])>>6)+((0xc0 & d[2*i+1])>>4);

if(m != i % 8) lost = 1;

}

if (lost == 1)

{

printf("lost sync\n");

for(t=0;t<200000;t++); /* wait to try again */

}

} /* done with acquisition */

MX844 Datasheet(PDF) 13 Page - IXYS Corporation

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