Question about the FREQOUT command in SX/B

T'Saavik · 2007-02-16 19:11

FREQOUT:
Does this command start the pulses and allow the program to continue on, or does it pause until the command is complete? I can't find this information in the sx-key sx/b command help page, is there somewhere else i should be looking?

For example if i do:

    FREQOUT IR_emit_Left, 1, 38000        ' FREQOUT (Pin, Duration in ms 1-255, Freq in hz 1-65335) square wave output
    COUNT Front_IR_Detect, 1, ir_in

Should i get anything in ir_in? Right now I'm trying this, and its not working. i tried adjusting the duration from 1 to 10 to 255 just in case it was too a transmit for my detector. If i bring in an external 38khz IR emitter (a remote control) and shoot it at the detector it does increment ir_in. I've replaced the IR emitter with a led and it does light. I haven't checked the freq of the output yet, my ghetto-scope isn't setup right now.

Bean · 2007-02-16 19:34

tsaavik,
The FREQOUT command stops the program while it is generating.
If you are using the SX48 you can easily use one of the two timers to generate 38KHz.

On the SX28, you can create an interrupt to generate the 38KHz (but it make skew timing with other commands).

The following is all you need for the interrupt routine. Make sure the LEDPin is set to an output.

INTERRUPT NOPRESERVE 76000
  IR_Emit_Left = ~IR_Emit_Left   ' Toggle left led pin state
  IR_Emit_Right = ~IR_Emit_Right ' Toggle right led pin state
RETURNINT

Bean.

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Post Edited (Bean (Hitt Consulting)) : 2/16/2007 7:41:56 PM GMT

T'Saavik · 2007-02-16 19:49

Wow, that is some NICE code, thank you so much!! I originally was trying to do this as an interrupt but the examples i found were so complicated i jumped when i saw the FREQOUT command (plus i like saying freak out).

Bean · 2007-02-16 19:55

If I remember you are using a 50MHz resonator. That's good, then the interrupt routine won't cause problems as much.

Yeah Freak-Out... da da da da... da da... da da... Freak-Out [noparse];)[/noparse]
Okay, I'm showing my age...

Bean.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Cheap used 4-digit LED display with driver IC·www.hc4led.com

Low power SD Data Logger www.sddatalogger.com
SX-Video Display Modules www.sxvm.com
Stuff I'm selling on ebay http://search.ebay.com/_W0QQsassZhittconsultingQQhtZ-1

"USA Today has come out with a new survey - apparently, three out of every four people make up 75% of the population." - David Letterman

Question about the FREQOUT command in SX/B

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