HVR-1800/1850 aka CX23885
A message that is not in the archive (sent off-list or not yet received): [email protected]
Hi Bob:
(CC-ing linux-media mailing list.)
Quoted 7 lines · Bob Lightfoot
Dear Andy:
Based on what I read here
{http://ivtvdriver.org/pipermail/ivtv-users/2009-June/009460.html} you are or were maintaining the cx18 driver for Fedora.
I have been running a HVR-1600 and an HVR-1850-MCE successfully with
Centos 6 and Mythtv for some time now. But I have never seen a/dev/radioor had working fm radio in linux.
For an HVR-1600 with an FM antenna connector, FM radio should work under linux.
/dev/radio0 is the control node. It switches the card to radio mode and you can set the FM radio freq using it. You also can use it for volume control. This /dev/node doesn't provide any digitized radio data.
/dev/video24 is an ivtv/cx18 unique device node which provides the PCM radio data.
Using the cx18-alsa module, the cx18 driver will provide ALSA /dev/snd/pcm* nodes for the HVR-1600 which also provide the digitizer audio, the Linux standard way. The cx18-alsa implementtation doesn't implement the ALSA mixer controls, IIRC, so you can't use the ALSA interface to control the HVR-1600 volume directly.
Quoted 3 lines
I know the HVR-1850-MCE
had working fm radio in Vista and that dmesg shows linux as seeing the radio.
Analog support for the HVR-1850 in Linux was added late. It would not surprise me if FM radio support in that driver didn't exist or was not tested at all. I have not looked at that driver lately.
Quoted 2 lines
Can you suggest where to look for reading material on getting the
radio working?
For the cx18 and ivtv based cards, "ivtv-radio" is a simple CLI app that works in conjuntion with "aplay" to tune to an FM station and play the audio.
The source for ivtv-radio is in the archive here:
http://dl.ivtvdriver.org/ivtv/stable/ivtv-utils-1.4.1.tar.gz
Save the archive and rename the file to end in ".tar.gz.gz". The web server re-gzips the archive (*grumble*) so you need to gunzip it twice.
Regards,
Andy
Quoted 2 lines
Sincerely,
Bob Lightfoot
Quoted 7 lines
Quoted 3 lines
I know the HVR-1850-MCE
had working fm radio in Vista and that dmesg shows linux as seeing the radio.Analog support for the HVR-1850 in Linux was added late. It would not surprise me if FM radio support in that driver didn't exist or was not tested at all. I have not looked at that driver lately.
Bob, the last time I worked on the driver the FM radio was not functional.
Signature · 2 lines
Steven Toth - Kernel Labs http://www.kernellabs.com