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PIC 8-Channel Sony SIRC Decoder Demo [Deleted]

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Mike - K8LH

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Mike - K8LH submitted a new article:

PIC 8-Channel Sony SIRC Decoder Demo - Sony Remote Control Signal Decoding Demo (PIC16F1827 & Assembly Language).

This microcontroller project demonstrates one of many ways to decode Sony SIRC infrared remote control data. The assembly language program in this project borrows a method or algorithm found in a similar SIRC decoder project published by David De Vleeschauwer. I believe David's method is very well thought out and should be relatively immune to noise and IR interference. More on this later.

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micropad

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Can you please explain this area

movf TMR0,W ; pulse lo time (64-us ticks) |B0
addlw -(2600/64+1) ; test for ~2400 ± 200 usecs |B0
addlw 400/64+1 ; C=1 (2200..2600 usec range)? |B0
 

Mike - K8LH

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Can you please explain this area

Code:
        movf    TMR0,W          ; pulse lo time (64-us ticks)     |B0
        addlw   -(2600/64+1)    ; test for ~2400 ± 200 usecs      |B0
        addlw   400/64+1        ; C=1 (2200..2600 usec range)?    |B0
There's a page titled "Test If A Value Is In A Certain Range" in the source code repository on PICLIST that's probably worth checking out. I'm using this method to test if the IR signal low and high pulse widths are within a given range. In this case, I'm checking for a value in the range of 2200 to 2600 usecs. Of course the numbers are being scaled by 64 to match TMR0 resolution of 64-usecs so what we're really looking for here is a TMR0 value in the range of 34 to 40 (64-usec 'ticks') to qualify a ~2400-usec "start" pulse.

I hope this helps. Mike
 
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