Re: Problem with ACT200L and EPIA ME6000

[Karl B. <ka...@tu...>]

That doesn't look good at all.

The 39's are not a good thing, typical pulses are around
800 to 2000 in size.  39 is way to short, and indicates the lirc_sir
driver gets a single interrupt at the start of a pulse, but then
gets no more until a new pulse begins(and maybe some spuradic ones
inbetween which is what makes it unusable.).

What is supposed to happen is that a bunch of back to back interrupts
are generated throughout the pulse period, the lirc_sir driver measures
that time.

We know that IRDA doesn't work for all hardware.
Another strike against IRDA I guess.

I'm certain that you would not see this problem with the
home-brew serial circuit.  There is other hardware you can buy
as well with varying degrees of tradeoff on features.


On Thu, Jun 12, 2003 at 07:07:35AM +0200, Michael Reinelt wrote:
> >>I think there's something strange with the serial port on the EPIA,=20
> >>maybe there's some kind of "buffer" which adds some delays, which in=20
> >>turn struggles lirc. Is this possible? How could I debug this?
> >=20
> > If you get a chance, send us some mode2 output of the bad readings so
> > we can learn more about it.  You should be looking at mode2 output,
> > it has to be consistent.  Try the -m option to make it fit on a screen.
>=20
> Here you are:
>=20
> first, this is my (working) lircd.conf from the ASUS board:
>=20
>=20
> begin remote
>=20
>    name  CV_250-2_P188
>    bits           15
>    flags SPACE_ENC
>    eps            30
>    aeps          100
>=20
>    one            39  2044
>    zero           39  1016
>    ptrail         39
>    gap          46026
>    min_repeat      1
>    toggle_bit      0
>=20
>=20
>        begin codes
>            POWER                    0x00000000000041A2
>            ....
>        end codes
>=20
> end remote
>=20
>=20
> the mode2 output from the working ASUS board, where I pressed the=20
> "Power" Button twice:
>=20
>   16777176
>=20
>         39     2062       39     1048       39      971
>         39      999       39     1040       39      992
>         39     2029       39     2073       39     1040
>         39     2026       39     1062       39      970
>         39      997       39     2035       39     1040
>         39    46018       39     2129       39      946
>         39     1067       39      972       39      968
>         39     2069       39     1041       39      969
>         39     2058       39     1042       39     2024
>         39     2052       39     2063       39     1039
>         39     2047       39  1704313
>=20
>         39     2061       39     1044       39      982
>         39      999       39     1056       39      971
>         39     2053       39     2055       39     1039
>         39     2040       39     1015       39     1040
>         39      999       39     2018       39     1039
>         39    46006       39     2051       39     1039
>         39     1002       39     1040       39      991
>         39     2023       39     1017       39     1038
>         39     2007       39     1040       39     2025
>         39     2129       39     2010       39     1040
>         39     2014       39
>=20
>=20
> this looks good to me, as far as I understand this (and your information=
=20
> on http://www.turbobit.com/lirc2.html was very helpful!)
>=20
> and here comes a mode2 dump from the EPIA board (I pressed the "Power"=20
> button three times)
>=20
>   16777176
>=20
>         39     2063       39     1022       39      176
>         39      779       39     1003       39     1003
>         39      176       39      807       39     2065
>         39     2056      151      885       39     2078
>         39      990       39      176       39      788
>        150      911       39     2064       39      989
>         39      176       39    45858       39      176
>         39     1836       39     1014       39      176
>         39      782       39     1015       39     1006
>        150     1953      150      897       39      990
>         39     2063       39     1004      150     1953
>         39      180       39     1848       39      174
>         39     1863       39      989      151     1952
>        151  1753984
>=20
>         39      175       39     1849       39      176
>         39      807       39      989       39     1015
>        150      899       39      990       39      176
>         39     1864       39     2064       39      990
>         39      176       39     1863       39      176
>         39      774      150      911       39      990
>        150     1966       39      176       39      775
>        150    45959      151     1952      154      896
>         39      993       39      174       39      802
>        150      896       39     2065       39      989
>         39      176       39      800      150     1944
>        151      910       39     2051       39     2064
>         39     2057      150      910       39     2055
>         39  1213609
>=20
>         39     2044      150      911       39      989
>         39      176       39      807       39     1007
>         39      990       39      175       39     1850
>        150     1964       39      176       39      775
>        150     1966      151      885       39     1018
>         39      176       39      774      150     1953
>        150      897       39    46073       39     2064
>         39      990       39     1015      150      899
>         39     1001       39      176       39     1849
>         39      993      150      911       39     2064
>         39     1003       39     2064       39     2051
>         39     2067       39     1015       39      176
>         39     1849       39      176       39
>=20
>=20
> I can see two things:
> - the value "39" is somethimes increased to 150
> - the number of bits differ
>=20
>=20
> I could think of several reasons:
>=20
> - the serial port acts "strange"
> - the internal timing (rdtsc?) isn't exact enough
> - there are some other interrupts which disturb LIRC
>=20
> some other maybe helpful hints:
>=20
> - the machine is diskless, it boot sand runs with nfsroot
> - at the time of testing, there were no DVB drivers loaded and no VDR=20
> running
> - the machine was idle
> - I'm using the first serial port, without the serial driver loaded (so=
=20
> no "setserial uart noe" is necessary)
> - the serial port is at 0x3f8/irq4, the IRQ is not shared (at least=20
> /proc/interrupts says ist only used by the lirc module)
>=20
> I hope we can find the reason for this strange behaviour. I want to=20
> finish by VDR PC :-)
>=20
> Maybe I could try to assemble a simple serial receiver, but I'm afraid I=
=20
> will run into the same timing issues there....
>=20
>=20
> Many thanks in advance!
>=20
> bye, Michael
>=20
> --=20
> netWorks                                          Vox: +43 316  698260
> Michael Reinelt                                   Fax: +43 316  692343
> Geisslergasse 4                                   GSM: +43 676 3079941
> A-8045 Graz, Austria                          e-mail: re...@eu...
>=20
>=20
>=20
> -------------------------------------------------------
> This SF.NET email is sponsored by: eBay
> Great deals on office technology -- on eBay now! Click here:
> http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5
>=20