/* This program is distributed under the GPL, version 2 */
/* based on examples/bitbang.c in libftdi-0.10 */

#include <stdio.h>
#include <unistd.h>
#include <ftdi.h>

int main(int argc, char **argv)
{
    struct ftdi_context ftdic;
    int f,i;
    char buf[1];
    unsigned char c;
    int dir = 0;

    ftdi_init(&ftdic);

    f = ftdi_usb_open(&ftdic, 0x0403, 0x6001);

    if(f < 0 && f != -5) {
        fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
        exit(-1);
    }

    printf("ftdi open succeeded: %d\n",f);

    printf("enabling bitbang mode\n");
    ftdi_enable_bitbang(&ftdic, 0xFF);

    sleep(1);

    buf[0] = 0x0;
    printf("turning everything on\n");
    f = ftdi_write_data(&ftdic, buf, 1);

    c = 1;
    dir = 0;
    while (1) {
      f = ftdi_write_data(&ftdic, &c, 1);
      // fprintf(stderr, "%02x ", c);
      if (dir == 0)
	c <<= 1;
      else 
	c >>= 1;

      if (c == 0) {
	if (dir == 0) {
	  c = 0x80;
	  dir = 1;
	} else {
	  c = 1;
	  dir = 0;
	}
      }
      usleep(70*1000);
    }

    printf("disabling bitbang mode\n");
    ftdi_disable_bitbang(&ftdic);

    ftdi_usb_close(&ftdic);
    ftdi_deinit(&ftdic);
}