dig2=dig1;
printf("\n\rValue entered: %d\n\r",dig1);
dig1=dig1+1;
couti(dig1); /* Transmit on Internal */
dig1=cine(); /* Receive on External */
printf("INCREMENTED, TRANSMITTED FROM INTERNAL TO EXTERNAL \n\r");
printf("Value received: %d\n\r",dig1);
dig2=dig2+1;
coute(dig2); /* Transmit on External */
dig2=cini(); /* Receive on Internal */
printf("INCREMENTED, TRANSMITTED FROM EXTERNAL TO INTERNAL \n\r");
printf("Value received: %d\n\r",dig2);
return;
}
void main()
{
/* Initialization Baud Rate */
outportb(COM1+LCR, 0x87); /* Set internal DLAB */
outportb(COM5+LCR, 0x87); /* Set external DLAB */
outportb(COM1+DLM,0); /* High divisor internal */
outportb(COM1+DLL,0x10); /* Low divisor internal */
outportb(COM5+DLM,0); /* High divisor external */
/* should be 0x12 */
outportb(COM5+DLL,0x10); /* Low divisor external */
choice=0;
while (choice != 4)
{ printf("1. Loopback Mode \n\r");
printf("2. Continuous Transmission \n\r");
printf("3. Enter value and increment\n\r");
printf("4. Exit \n\r");
printf("Enter choice: ");
scanf("%d",&choice);
while(!((choice==1)||(choice==2)|| (choice==3)||(choice==4)))
{ printf("\n\rPlease re-enter:\n\r");
scanf("%d",&choice);
}
if (choice==1) loopback();
else if (choice==2) continuous();
else if (choice==3) increment();
else return;
}
}
Figure 3 – Flow of Data
Loopback Test
KB => Int. Xmtr. => Int. Rcvr. => Display
KB => Ext. Xmtr. => Ext. Rcvr. => Display
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