pci550x_dio_in.c

linux下面

/*
 * pci550x user program - digitial I/O - inputs
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <unistd.h>

#include "pci550x.h"

/* GLOBLA DATA */
int i,m;
int fd;
int brd_type;
int rc;
unsigned dio_port0, dio_port1, dio_port16;

int main(int argc, char **argv) {

	/* open the device */
	fd = open(argv[1], O_RDWR);
	if(fd == -1) {
		perror("open failed");
		exit(1);
	} else {
		printf("open succeeded on %s\n", argv[1]);
	}

	/* query device type */
	rc = ioctl(fd, PCI550X_IOCG_BRD_TYPE, &brd_type);
	if(rc == -1) {
		perror("ioctl PCI550X_IOCG_BRD_TYPE");
		exit(1);
	} else {
		printf("ADAC Board Type:  %s\n", brd_names[brd_type]);
	}

	/* configure DIO port 0 as an input port */
	m = PCI550X_DIO_INPUT;
	rc = ioctl(fd, PCI550X_IOCT_DIO_DDC0, m);
	if(rc == -1) {
		perror("ioctl PCI550X_IOCT_DIO_DDC0");
		exit(1);
	} else {
		rc = ioctl(fd, PCI550X_IOCG_DIO_0, &dio_port0);
		if (rc == -1) {
			perror("ioctl PCI550X_IOCG_DIO_0");
			exit(1);
		} else
			printf("DIO port 0 configured for input\n");
			printf("DIO port 0 reads: 0x%x\n", dio_port0);
	}

	/* configure DIO port 1 as an input port */
	m = PCI550X_DIO_INPUT;
	rc = ioctl(fd, PCI550X_IOCT_DIO_DDC1, m);
	if(rc == -1) {
		perror("ioctl PCI550X_IOCT_DIO_DDC1");
		exit(1);
	} else {
		rc = ioctl(fd, PCI550X_IOCG_DIO_1, &dio_port1);
		if (rc == -1) {
			perror("ioctl PCI550X_IOCG_DIO_1");
			exit(1);
		} else
			printf("DIO port 1 configured for input\n");
			printf("DIO port 1 reads: 0x%x\n", dio_port1);
	}

	/* read both DIO input ports */
	rc = ioctl(fd, PCI550X_IOCG_DIO_16, &dio_port16);
	if (rc == -1) {
		perror("ioctl PCI550X_IOCG_DIO_16");
		exit(1);
	} else
		printf("DIO port 16 reads: 0x%x\n", dio_port16);

	close(fd);
	return(0);
	
}