libftdi: (tomj) polished documentation, started "examples" dir

[libftdi] / examples / bitbang2.c

diff --git a/examples/bitbang2.c b/examples/bitbang2.c
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+++ b/examples/bitbang2.c
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+/* ftdi_out.c
+ *
+ * Output a (stream of) byte(s) in bitbang mode to the 
+ * ftdi245 chip that is (hopefully) attached. 
+ *
+ * We have a little board that has a FT245BM chip and 
+ * the 8 outputs are connected to several different 
+ * things that we can turn on and off with this program. 
+ *
+ * If you have an idea about hardware that can easily
+ * interface onto an FTDI chip, I'd like to collect
+ * ideas. If I find it worthwhile to make, I'll consider
+ * making it, I'll even send you a prototype (against
+ * cost-of-material) if you want.
+ * 
+ * At "harddisk-recovery.nl" they have a little board that 
+ * controls the power to two harddrives and two fans. 
+ * 
+ * -- REW R.E.Wolff@BitWizard.nl
+ *
+ *
+ *
+ * This program was based on libftdi_example_bitbang2232.c 
+ * which doesn't carry an author or attribution header.
+ *
+ *
+ * This program is distributed under the GPL, version 2. 
+ * Millions copies of the GPL float around the internet.
+ */
+
+
+#include <stdio.h>
+#include <unistd.h>
+#include <ftdi.h>
+
+void ftdi_fatal (struct ftdi_context *ftdi, char *str)
+{
+    fprintf (stderr, "%s: %s\n",
+             str, ftdi_get_error_string (ftdi));
+    exit (1);
+}
+
+int main(int argc, char **argv)
+{
+    struct ftdi_context ftdic;
+    int i, t;
+    unsigned char data;
+    int delay = 100000; /* 100 thousand microseconds: 1 tenth of a second */
+
+    while ((t = getopt (argc, argv, "d:")) != -1) {
+        switch (t) {
+        case 'd':
+            delay = atoi (optarg);
+            break;
+        }
+    }
+
+    ftdi_init(&ftdic);
+
+    if (ftdi_usb_open(&ftdic, 0x0403, 0x6001) < 0)
+        ftdi_fatal (&ftdic, "Can't open ftdi device");
+
+    if (ftdi_enable_bitbang(&ftdic, 0xFF) < 0)
+        ftdi_fatal (&ftdic, "Can't enable bitbang");
+
+    for (i=optind; i < argc ; i++) {
+        sscanf (argv[i], "%x", &t);
+        data = t;
+        if(ftdi_write_data(&ftdic, &data, 1) < 0) {
+            fprintf(stderr,"write failed for 0x%x: %s\n",
+                    data, ftdi_get_error_string(&ftdic));
+        }
+        usleep(delay);
+    }
+
+    ftdi_usb_close(&ftdic);
+    ftdi_deinit(&ftdic);
+    exit (0);
+}