initial import

git-svn-id: svn://anubis/misc/parport-bare@2 bd8a9e45-a331-0410-811e-c64571078777

Makefile

@@ -0,0 +1,5 @@
+
+all:	led
+
+led:	led.c
+	gcc -o $@ $<

led.c

@@ -0,0 +1,80 @@
+
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <linux/parport.h>
+#include <linux/ppdev.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#define WAIT 100000
+
+int running = 1;
+
+void	signalHandler(int sig)
+{
+	running = 0;
+}
+
+int	main(void)
+{
+	int fd;
+	int result;
+	
+	signal(SIGINT, signalHandler);
+	
+	fd = open("/dev/parport0", O_RDWR);
+	
+	if (fd == -1)
+	{
+		perror("Could not open parallel port");
+		return 1;
+	}
+	
+	printf("Claiming parallel port\n");
+	if (ioctl(fd, PPCLAIM, NULL))
+	{
+		perror("Could not claim the parallel port!");
+		close(fd);
+		return 2;
+	}
+	
+	int mode = IEEE1284_MODE_BYTE;
+	if (ioctl(fd, PPSETMODE, &mode))
+	{
+		perror("Could not set mode");
+		ioctl(fd, PPRELEASE);
+		close(fd);
+		return 3;
+	}
+	
+	int dir = 0x00;
+	if (ioctl(fd, PPDATADIR, &dir))
+	{
+		perror("Could not set parallel port direction");
+		ioctl(fd, PPRELEASE);
+		close(fd);
+		return 4;
+	}
+	
+	char dataH = 0xFF;
+	char dataL = 0x00;
+	
+	for(;;)
+	{
+		ioctl(fd, PPWDATA, &dataH);
+		usleep(WAIT);
+		if (!running)
+			break;
+		ioctl(fd, PPWDATA, &dataL);
+		usleep(WAIT);
+		if (!running)
+			break;
+	}
+	
+	printf("Releasing parallel port\n");
+	ioctl(fd, PPRELEASE);
+	close(fd);
+	return 0;
+}