[FT232RL] Program to control potentiometer

[Garrido Xavier <garrido@xxxxxxxxxxxx>]

Dear libftiusers,

We recently buy this device http://www.controlanything.com/Relay/Device/UPOT8PROXR which has poor documentation and all piece of software are done for Windows. Since we would like to control via Ubuntu machines, I then came accros your library.

First, I have used the simple.c program to test USB communication (everything got fine) and then, following the programs given in libftdi examples directory, I made this piece of code

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

int main(int argc, char **argv)
{
  struct ftdi_context ftdic;
  int f, i;
  unsigned char buf[3];

  if (ftdi_init(&ftdic) < 0)
    {
      fprintf(stderr, "ftdi_init failed\n");
      return EXIT_FAILURE;
    }

  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));
      return EXIT_FAILURE;
    }

  printf("ftdi open succeeded: %d\n",f);
  ftdi_set_bitmode(&ftdic, 0xFF, BITMODE_RESET);
  ftdi_set_baudrate(&ftdic,9600);
  ftdi_write_data_set_chunksize(&ftdic,3);

  printf("turning every potentiometer on\n");

  buf[0] = 0xFE;
  buf[1] = 0xAB;
  buf[2] = 128;

  while (1)
    {
      f = ftdi_write_data(&ftdic,buf,3);
      if (f < 0)
        {
          fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[2],f, ftdi_get_error_string(&ftdic));
        }
    }

  f = ftdi_usb_close(&ftdic);
  if (f < 0)
    {
      fprintf(stderr, "unable to close ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
      return EXIT_FAILURE;
    }
  ftdi_deinit(&ftdic);
}

I do not get any errors but when measuring the electrical resistance with a ohmmeter, I do not get any change. Help will be greatly appreciated, so thanks in advance for any kind of advices/comments.

Xavier Garrido

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