added files

git-svn-id: svn://anubis/misc/parport-write@230 bd8a9e45-a331-0410-811e-c64571078777

Makefile

@@ -0,0 +1,7 @@
+
+TARGET := parport-write
+
+all: $(TARGET)
+
+$(TARGET): $(TARGET).c
+	gcc -o $@ $<

parport-write.c

@@ -0,0 +1,78 @@
+
+#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 <string.h>
+
+char getVal(int argc, char * argv[])
+{
+    int val = 0xFF;
+    if (argc >= 2)
+    {
+        if (strlen(argv[1]) >= 2 && strncmp(argv[1], "0x", 2) == 0)
+        {
+            sscanf(argv[1] + 2, "%x", &val);
+        }
+        else
+        {
+            sscanf(argv[1], "%d", &val);
+        }
+    }
+    else
+    {
+        printf("Value not specified, using 0x%x\n", val);
+    }
+    return val;
+}
+
+int main(int argc, char * argv[])
+{
+    int fd;
+    int result;
+    char val = getVal(argc, argv);
+
+    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;
+    }
+
+    ioctl(fd, PPWDATA, &val);
+
+    printf("Releasing parallel port\n");
+    ioctl(fd, PPRELEASE);
+    close(fd);
+    return 0;
+}