[vdr] Re: lirc_serial modul doesn't work with the VdrNFSroot mini distribution

[Sascha Volkenandt <lists@magoa.net>]

At Freitag, 4. Juli 2003 16:12 Thomas Glomann wrote:
> The IR receiver ("homebrew serial ...") doesn't generate any output with
> mode2.
> I doubt that the lirc_serial module is even loaded properly because i get
> the following kernel message :
>    lirc_serial: auto detectetd active high receiver
> however, it should detect a    low   receiver. That is what is says when
> i use the IR receiver on my other computers. there it works just fine. If
> I load the the lirc_serial module without havin connected the actual
> hardware it also detects a high receiver.
>
> So I think it must be somehow related to the VdrNfsRoot distri. There
> were no /dev entries for serial ports like /dev/ttyS0.  I created ttyS0
> with mknod ttyS0 c 4 64

You don't need a serial device node for LIRC, because the module accesses 
the serial port directly. However, if you have serial support compiled into 
the kernel, you have to disable that by saying 

setserial /dev/ttyS0 uart none

before loading the lirc_serial module (and for that you need the device node 
of course). If that still doesn't work, it doesn't seem to be a software 
problem. If you say the same receiver works elsewhere, double-check that 
your serial port is activated in the BIOS. 

Could be a power issue as well, I've had the experience that powering the 
circuit with the voltage-regulator didn't work at my Mini-ITX board, 
because it's serial voltage is far too low. Instead I've removed the 
voltage regulator and connected the circuit to +5V directly. Works fine 
now.

Ah, by the way, next time you create a new thread, please don't use the 
"Reply" button on another Mail. Doesn't look good inside a tree-view 
mailclient.

Greetings,
Sascha


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