On 06/08/2013 02:31 PM, Antti Palosaari wrote:
On 06/08/2013 02:22 AM, Rodrigo Tartajo wrote:
Hi, I just compiled and tested Antti Palosaari branch and can confirm
the remote works for my RTL2832U. I have updated the wiki[1] entry
with the steps necessary to configure the remote control. Please
confirm if these fixes your problem.
Rodrigo.
[1] http://www.linuxtv.org/wiki/index.php/RealTek_RTL2832U
Good. I tested it quite limited set of remote controllers and even found
one NEC remote which didn't worked - RC_MAP_MSI_DIGIVOX_II. Maybe
timings should be adjusted or there is some other factor. I didn't cared
to look it more as I am not very familiar with these raw remote
protocols and real life variations.
I also had no reference to adjust remote timings. I just used one RC5
remote and calibrated timings according to that. If there is someone
having better reference signals, then feel free to change that timing
value to more correct.
Rodrigo,
as it was you who has defined that factor as a:
1000000000 / 38000 * 2 = 52631
I found 50800 most suitable by error and trial testing against one RC5
remote. I see 38000 is coming from IR frequency, but what is 1GHz clock
derived? And why multiply by 2? Reference clock feed to chip is 28.800
MHz and most likely these timings should be derived somehow from it. I
tried to make different calculations but didn't find any suitable...
Also what I remember, these IR leds will not return receiver carrier at
given frequency (38kHz in that case) but instead longer pulses. If there
is 0.5 sec 38 kHz modulated IR wave then IR-led will return 0.5 sec
continuous pulse. So that frequency should not matter too.
I did learning IR remote controller, which has both receiver and IR
sender, as a school project:
http://palosaari.fi/img_1305.jpg
Unfortunately that was returned to the uni and was thrown to the trash
can :S I have thought many times that board could be handy tool for
hacking support for these remote controllers...
regards
Antti
--
http://palosaari.fi/
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