At 10:08 AM -0500 10/19/05, Robert Denier wrote:
For some reason my lirc output has been very unreliable lately. I keep getting wrong channels, particularly sense I went to dish 301 receivers from the newer model version.
I have the same problem. I believe it has to do with the fact that lirc relies on the RTC timer. If something happens to interrupt it while it's pausing, the frequency of the output will be off and the receiver will balk. I think what makes the 301 more sensitive to this than other IR devices is the fact that it operates at a higher frequency (56000 Hz) than most.
I'm using an opto-coupler to interface my serial port to the Dish 301 receivers, so I know it's not an LED-related problem. I have tried niceing the lirc process so it won't be as likely to get interrupted, but that doesn't seem to help.
My next step is to build a device that will send the IR pulses independently of the PC, but I don't know how long that will take. For now I just put up with the occasional missed program.
By the way, I analyzed the signal received by the Dish receiver with an oscilloscope and compared it to what was being generated by my device. After tweaking, I came to this lirc config, modified from the stock "3100" remote:
begin remote name 3100 bits 16 flags SPACE_ENC eps 30 aeps 100 header 550 5830 one 550 1550 zero 550 2570 ptrail 550 gap 5530 min_repeat 8 toggle_bit 0 frequency 56000 -- Dan Wilga [EMAIL PROTECTED] Web Administrator http://www.mtholyoke.edu Mount Holyoke College Tel: 413-538-3027 South Hadley, MA 01075 "Who left the cake out in the rain?"
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