Re: [Ftdi-usb-sio-devel] Cant do simple serial-mode writes on FT2232H

[Bill R. <bil...@gm...>]

Hi there,

This list is for the kernel driver which you access through the normal
open,close termios stuff. The driver doesn't have a userspace ftdi.h.

It looks like you're using a userspace ftdi library and so will probably
want a different forum.



On Thu, Nov 26, 2009 at 4:50 AM, T. Horsnell <ts...@mr...> wrote:

> Hi,
> I'm struggling with what ought to be the most straightforward thing.
> I'm trying to write to channel A of an FT2232H mini-module in serial
> mode, but after writing a total of 4096 bytes, the writes hang
> and I get an error -110 returned.
> Presumably the buffer on the mini-module has filled up. But why
> is this not being emptied as the device send things to its serial pin?
> I've set flow-control to SIO_DISABLE_FLOW_CTRL (does this function
> actually work? It seems to return success even if I try idiot values
> like -1 or 12345 for the flow-control parameter).
>
> Thanks,
> Terry
>
> My code:
>
> #include <stdio.h>
> #include <time.h>
> #include <unistd.h>
> #include <usb.h>
> #include <ftdi.h>
>
> const int vendor_id=0x0403;
> const int product_id=0x6010;            //FT2232H
>
> int main(int argc, char **argv)
> {
> struct ftdi_context ftdicA,ftdicB;
> int f,i,j,k;
>
> printf("setting up channel A\n");
> ftdi_init(&ftdicA);
> f = ftdi_usb_open(&ftdicA, vendor_id, product_id);
> if(f < 0 && f != -5)
>   {
>   fprintf(stderr, "unable to open ftdi device: %d -
> %s\n",f,ftdicA.error_str);
>   exit(-1);
>   }
> printf("ftdi open A succeeded: %d\n",f);
>
> printf("setting flowcontrol\n");
> //i=ftdi_setflowctrl(&ftdicA, SIO_DISABLE_FLOW_CTRL);
> i=ftdi_setflowctrl(&ftdicA, 7);
> if (i != 0)
>   {
>   printf("setting channel A flow-control failed. stat=%i\n",i);
>   exit(0);
>   }
>
> #define BUFLEN 100000
> unsigned char buf0[BUFLEN];
> for (i=0; i<BUFLEN; i++) buf0[i]=0xff;
>
> for (j=0; j<5; j++)
>   {
> printf("loop=%i\n",j);
> //write a buffer
>   f = ftdi_write_data(&ftdicA, buf0, 1000);
>   if(f < 0)
>     {
>     fprintf(stderr,"write failed for %x, error %d -
> %s\n",buf0[0],f,ftdicA.error_str);
>     break;
>     }
>   }
>
> ftdi_usb_close(&ftdicA);
> ftdi_deinit(&ftdicA);
> return 0;
> }
>
>
>
>
>
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