Can't set DTR pin

[Ladislav Vaiz <spam@xxxxxxxxx>]

Hi all,
I would like to manual control DTR pin on FT232R (SSOP). Simplified 
example is:


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

struct ftdi_context *ftdi;
int ftdi_vid = 0xa600, ftdi_pid = 0xe112;
int i, ret, speed = 9600;

int main(int argc, char *argv[]){

    ftdi = ftdi_new();
    if (!ftdi){
        printf("Can't init ftdi library");
        return 1;
    }

    printf("ftdi_open %04x:%04x\n", ftdi_vid, ftdi_pid);
    ret=ftdi_usb_open(ftdi, ftdi_vid, ftdi_pid);
    if (ret){
        printf("Can't open ftdi device %04x:%04x, error=%d %s", 
ftdi_vid, ftdi_pid, ret, ftdi_get_error_string(ftdi));
        if (ret==-8) printf("Maybe try to add user %s into proper group 
or run program as root", getenv("USER"));
        ftdi_free(ftdi);
        return ret;
    }

    ret=ftdi_set_baudrate(ftdi, speed);
    if (ret){
        printf("Can't set baudrate %d, error=%d %s", speed, ret, 
ftdi_get_error_string(ftdi));
        ftdi_free(ftdi);
        return ret;
    }

    while(1){
        ret = ftdi_setdtr(ftdi, i);
        printf("ftdi_dtr(%d) = %d\n", i, ret);
        usleep(100000);
        i = !i;
    }
}


Output is:
ftdi_dtr(1) = 0
ftdi_dtr(0) = 0
ftdi_dtr(1) = 0
ftdi_dtr(0) = 0
........


But at pin 2 I can't see any change, it is in log.1. What is wrong? 
Hardware is good, If I use bitmode 1, I can turn DTR by changing bit 4 
(mask 0x10).

Thank you Lada


--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
To unsubscribe send a mail to libftdi+unsubscribe@xxxxxxxxxxxxxxxxxxxxxxx