How to find which command generates error in FE_SET_PROPERTY

I'm trying to modify one of my applications to use the new S2API. With this application I control my dvb-t and dvb-s/s2 receivers.

I'm using szap-s2 as an example but I run into a problem that the ioctl FE_SET_PROPERTY always returns -1 and variable errno is set to 14.

My question is. How do I determine which of the commands in the command queue given to FE_SET_PROPERTY is producing this error. I did not try yet to devide my command queue up into one command queue per command.

Regards,

Michel.

Part of source code for dvb-s/s2:

#ifdef S2API
int TDVBDevice::SetProperty(struct dtv_property *cmdseq) {
int err;

  err = ioctl(vfrontendfd, FE_SET_PROPERTY, cmdseq);

if (err < 0)
{
syslog(LOG_ERR, "ioctl FE_SET_PROPERTY failed (errno=%d,

%d).",errno, err);
    return -1;

}

syslog(LOG_INFO, "ioctl FE_SET_PROPERTY ok.");
return 0;
}
#else
int TDVBDevice::SetFrontend(struct dvb_frontend_parameters *frontend) {
if (ioctl(vfrontendfd, FE_SET_FRONTEND, frontend) < 0)

  {
    syslog(LOG_ERR, "ioctl FE_SET_FRONTEND failed (errno=%d).",errno);
    return -1;

}

return 0;
}
#endif

//calling part

#ifdef S2API
    struct dtv_property p[DTV_IOCTL_MAX_MSGS];

    p[0].cmd = DTV_CLEAR;
    p[1].cmd = DTV_DELIVERY_SYSTEM; p[1].u.data = atoi(channel->Item(2));
    p[2].cmd = DTV_FREQUENCY;       p[2].u.data = (__u32)(ifreq * 1000);
    p[3].cmd = DTV_MODULATION;      p[3].u.data = QPSK;
    p[4].cmd = DTV_SYMBOL_RATE;     p[4].u.data = (__u32)(sr * 1000);
    p[5].cmd = DTV_INNER_FEC;       p[5].u.data = FEC_AUTO;
    p[6].cmd = DTV_INVERSION;       p[6].u.data = INVERSION_AUTO;
       //     { .cmd = DTV_ROLLOFF,           .u.data = rolloff },
    p[7].cmd = DTV_PILOT;           p[7].u.data = PILOT_AUTO;
    p[8].cmd = DTV_TUNE;

    struct dtv_properties cmdseq;

    cmdseq.num = 9;
    cmdseq.props = p;

#else 
    frontend.frequency = (unsigned int)(ifreq * 1000);
    frontend.inversion = INVERSION_AUTO;
    frontend.u.qpsk.symbol_rate = (unsigned int)(sr * 1000);
    frontend.u.qpsk.fec_inner = FEC_AUTO;

#endif

#ifdef S2API
      if (SetProperty(&p[0]) == 0)
#else
      if (SetFrontend(&frontend) == 0)

#endif

_______________________________________________
linux-dvb mailing list
[email protected]
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb

In message <[email protected]>, Michel Verbraak wrote:

LO

The only commands as such as CLEAR and TUNE, the rest are tuning parameters. The way this works is that the TUNE command informs the kernel to retune using the parameters specified. This occurs outside of the IOCTL call itself and you don't directly know if a paramater was wrong, it just doesn't work.

The error you have:

#define EFAULT 14 /* Bad address */

Suggests a problem in your code...

This should something like SetProperties(struct dtv_properties cmdseq[]) and then call ioctl(fefd, FE_SET_PROPERTY, cmdseq)
This sends of your args at the same time.

That needs to be more like:
SetProperties(&cmdseq)

I hope that helps.

cya!

--

// /
{:)==={ Darron Broad <[email protected]>
\\ \

_______________________________________________
linux-dvb mailing list
[email protected]
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb

Darron Broad schreef:

Darron,

You were right. The error I had to solve was to change SetProperty(&p[0]) into SetProperty(&cmdseq).

I have been coding all day and missed this one.

Thanks,

Michel.

_______________________________________________
linux-dvb mailing list
[email protected]
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb