I am trying to turn an LED on and off when a signal is received within Me-TV

Can anyone help me? I think I am now getting on the right track.

I know the commands to enable GPIO and turn ON and OFF

gpio mode 0 out # enable
gpio 0 1 #turn LED ON
gpio 0 0 #turn LED OFF

I need to integrate them within the app

Within the file "dvb_frontend.cc" from Me-TV there is the following code for signal

if (!ioctl(fd, FE_READ_STATUS, &status))
{
if (status & FE_HAS_LOCK)
{
break;
}
}

usleep(100000);
count += 100;
}

if (!(status & FE_HAS_LOCK))
{
g_debug("Status: %d", status);
throw Exception(_("Failed to lock to channel"));
}
}

guint Frontend::get_signal_strength()
{
guint result = 0;
if (ioctl(fd, FE_READ_SIGNAL_STRENGTH, &result) == -1)
{
throw SystemException(_("Failed to get signal strength"));
}
return result;
}

guint Frontend::get_snr()
{
guint result = 0;
if (ioctl(fd, FE_READ_SNR, &result) == -1)
{
throw SystemException(_("Failed to get signal to noise ratio"));
}
return result;
}

const struct dvb_frontend_parameters& Frontend::get_frontend_parameters() const
{
return frontend_parameters;
}

Would I merge in the commands somewhere here ?
if (!ioctl(fd, FE_READ_STATUS, &status))
{
if (status & FE_HAS_LOCK)
{
break;##

gpio mode 0 out: # enable
gpio 0 1 #turn LED ON
}
}

usleep(100000);
if (ioctl(fd, FE_READ_SIGNAL_STRENGTH, &result) == -1)
{
throw SystemException(_("Failed to get signal strength"));
}
return result;
gpio mode 0 out # enable
gpio 0 0 #turn LED OFF

You might get a better response on the official Raspberry Pi forums.

andi968,

There are a wide range of methods available to solve the question you asked. Your question requires more background info than I have time to type, so here are a few links that will answer all your questions.

http://hertaville.com/introduction-t...gpio-in-c.html
http://www.pieter-jan.com/node/15
https://www.raspberrypi.org/forums/v...p?f=33&t=82752
http://elinux.org/RPi_GPIO_Code_Samp...egister_access

hope this helps

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