/usr/share/doc/libftdi1-doc/examples/bitbang.c is in libftdi1-doc 1.4-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | /* This program is distributed under the GPL, version 2 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ftdi.h>
int main(int argc, char **argv)
{
struct ftdi_context *ftdi;
int f,i;
unsigned char buf[1];
int retval = 0;
if ((ftdi = ftdi_new()) == 0)
{
fprintf(stderr, "ftdi_new failed\n");
return EXIT_FAILURE;
}
f = ftdi_usb_open(ftdi, 0x0403, 0x6001);
if (f < 0 && f != -5)
{
fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(ftdi));
retval = 1;
goto done;
}
printf("ftdi open succeeded: %d\n",f);
printf("enabling bitbang mode\n");
ftdi_set_bitmode(ftdi, 0xFF, BITMODE_BITBANG);
usleep(3 * 1000000);
buf[0] = 0x0;
printf("turning everything on\n");
f = ftdi_write_data(ftdi, buf, 1);
if (f < 0)
{
fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(ftdi));
}
usleep(3 * 1000000);
buf[0] = 0xFF;
printf("turning everything off\n");
f = ftdi_write_data(ftdi, buf, 1);
if (f < 0)
{
fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(ftdi));
}
usleep(3 * 1000000);
for (i = 0; i < 32; i++)
{
buf[0] = 0 | (0xFF ^ 1 << (i % 8));
if ( i > 0 && (i % 8) == 0)
{
printf("\n");
}
printf("%02hhx ",buf[0]);
fflush(stdout);
f = ftdi_write_data(ftdi, buf, 1);
if (f < 0)
{
fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(ftdi));
}
usleep(1 * 1000000);
}
printf("\n");
printf("disabling bitbang mode\n");
ftdi_disable_bitbang(ftdi);
ftdi_usb_close(ftdi);
done:
ftdi_free(ftdi);
return retval;
}
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