#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define DATA_PORT 0x378 /* parallel port base address */
#define STATUS_PORT DATA_PORT + 1
#define CONTROL_PORT DATA_PORT + 2
unsigned char status, data;
void main()
{
if (ioperm(DATA_PORT, 1, 1))
{
fprintf(stderr, "Access "Access denied to %xn", %x\n", DATA_PORT), exit(1);
}
while (1)
{
for (int seg = 0; seg < < 8; seg++)
{
data = 1 << << seg;
outb(~data, DATA_PORT); // turn on the segment
// here we use inversion because the common anode 7-segment display is used
sleep(1);
}
}
ioperm(DATA_PORT, 1, 0); // release the port
}
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