That's correct.

--Bob

Lindy Mayfield wrote:
> So basically you have an 8 bit buffer which shows the state of each key over a 10 ms/bit time frame.
>
> That's really cool!
>
> Is #3 below correct, though?  The way I understand it, b'11110000' (given 0=pressed) would mean that at one point 80 ms ago the button was up (4 1's) and was then held down for 40 ms (4 0's).  Or do I misunderstand how it works?
>
> I can see using this method it would be easy to implement repeating and speeding up, etc.
>
>
>
>>About 10 years ago I began using a bulletproof way to process
>>keys:
>>
>>1. I read the keys- all of them- every 10ms or so. I can either
>>read 'em
>>all at one tome, or rotate so that I read each one on a rotating
>>basis.
>>Doesn't matter how its done, it works perfectly regardless.
>>
>>2. Every 10ms I read the key and shift its value into a register
>>decicated just for that application.
>>
>>3. If the key is ZERO when it is pressed, I look for the pattern
>>b'11110000' on that key's register. When that is seen, that key
>>was
>>PRESSED AND RELEASED, so set a flag. To prevent more action, jam
>>the
>>key's register with '11111111' so it can't be used again.
>>
>>This works great. If anyone is interested, I'll publish some
>>code.
>>
>
>
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         Bob Axtell
PIC Hardware & Firmware Dev
   http://beam.to/baxtell
       1-520-219-2363

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