Hello bit bangers, some strategic advice please, if you will.
I have a LED020 IR sensor (from Tech Supplies) and have fed the output to a Logic analyser which seems to indicate that the framing from the family TV STB remote control has pulses that are either 0.9mS or 1.8mS in duration, with a total frame length of 23.4mS and 26 arbitrary units long.
In my minds eye, although I have only checked the one command, this represents four bytes worth of data (32 units, with a few spares). In an ideal world I would point at the four bytes in memory and shift them left or right until I was done.
Reading in characters from memory, then masking, acting on the result and dividing eight times, rinsing and repeating is likely to put a few jitters in the data; first element adjustment for each byte would probably take care of that and while not elegant, would probably be more concise and allow more scope for extension than a linear, non-iterative solution.
0 1 0 1 00 11 00 11 00 11 00 1 0 1 0 1 0 1 0 in my example, the spaces representing transitions, with an idle high condition. I'm unsure if the 0 or 1 condition indicates a presence of PWM carrier, but don't see that as a significant problem.
My immediate thoughts are to use an 08M2+ for size and simplicity, but an 18M2+ will certainly allow me to use the internal modulator per Hippy's advice some time ago regarding tone mod or AFSK telegraph tones.
What am I making . . . I suspect that the truth is, a bit of a nuisance of myself with my nearest and dearest who might take delight at a random channel change of an afternoon when I'm not in.
I'm not soliciting code, as I believe that I can write that myself and then post it back here, but I would like to know if my chosen strategy is relatively sound.
Of course, once tested, the output stage might be made a bit more Universal, or is that slightly less than Global . . . ? I feel mischief coming on!
I have a LED020 IR sensor (from Tech Supplies) and have fed the output to a Logic analyser which seems to indicate that the framing from the family TV STB remote control has pulses that are either 0.9mS or 1.8mS in duration, with a total frame length of 23.4mS and 26 arbitrary units long.
In my minds eye, although I have only checked the one command, this represents four bytes worth of data (32 units, with a few spares). In an ideal world I would point at the four bytes in memory and shift them left or right until I was done.
Reading in characters from memory, then masking, acting on the result and dividing eight times, rinsing and repeating is likely to put a few jitters in the data; first element adjustment for each byte would probably take care of that and while not elegant, would probably be more concise and allow more scope for extension than a linear, non-iterative solution.
0 1 0 1 00 11 00 11 00 11 00 1 0 1 0 1 0 1 0 in my example, the spaces representing transitions, with an idle high condition. I'm unsure if the 0 or 1 condition indicates a presence of PWM carrier, but don't see that as a significant problem.
My immediate thoughts are to use an 08M2+ for size and simplicity, but an 18M2+ will certainly allow me to use the internal modulator per Hippy's advice some time ago regarding tone mod or AFSK telegraph tones.
What am I making . . . I suspect that the truth is, a bit of a nuisance of myself with my nearest and dearest who might take delight at a random channel change of an afternoon when I'm not in.
I'm not soliciting code, as I believe that I can write that myself and then post it back here, but I would like to know if my chosen strategy is relatively sound.
Of course, once tested, the output stage might be made a bit more Universal, or is that slightly less than Global . . . ?
I feel mischief coming on!
