amforth-devel

[Amforth] Timer related things

[Matthias T. <mt...@we...>]

Hi,

I've collected a few timer related things from my sources and
extracted some useful (at least I hope that they are useful)
words for a common library of timers.

They can be found at the subversion repository in the
trunk/lib/hardware directory.

The timer library is layered: basic routines use the
hardware timer 0 (or 1) to generate a millisecond
tick. The current settings assume a 16MHz device (e.g.
Arduino's). This will need adjustment for other
frequencies.

Above the hardware layer is a generic timer module that
uses the tick information to provide generic timer
related tasks:
- after (runs a word after a specified amount of ms
- every (runs a word every xy ms, a special case is
  every-second)

and a few more words.

In the timer-test.frt are some use cases.

The routines assume a multitasking environment,
esp the "every" part will block any interaction
if called in the command line task. pause is called
very often (the word passed to every is not executed
in background but the whole thing may be used in
background tasks)

There may be some additional delay (2ms per cycle) as per

: test-every-second @tick u. key? ;
' test-every-second every-second
439 1441 2443 3445 4447 5449 6451 7453 8455 9457 10459  ok

so the "after" means "at least wait xy milliseconds, maybe more."
(serial IO needs its time)

I'm currently happy with what the words do (good enough).
Next step is to write some recipes on how to use the library.


Matthias

PS: to find the optimal settings for the TWI/I2C I've written a small
web-calculator at http://amforth.sourceforge.net/recipes/twi.html

Re: [Amforth] Timer related things

[pito <pi...@vo...>]

.. I would suggest
2variable timer0.tick
(and double calcs) otherwise it runs over in 65secs. But it depends
on the requirements of course..
p.

----- PŮVODNÍ ZPRÁVA -----
Od: "Matthias Trute" <mt...@we...>
Komu: "Everything around amforth"
<amf...@li...>
Předmět: [Amforth] Timer related things
Datum: 15.6.2012 - 21:34:05

> Hi,
> 
> I've collected a few timer related things from my
> sources and
> extracted some useful (at least I hope that they
> are useful)
> words for a common library of timers.
> 
> They can be found at the subversion repository in
> the
> trunk/lib/hardware directory.
> 
> The timer library is layered: basic routines use
> the
> hardware timer 0 (or 1) to generate a millisecond
> tick. The current settings assume a 16MHz device
> (e.g.
> Arduino's). This will need adjustment for other
> frequencies.
> 
> Above the hardware layer is a generic timer module
> that
> uses the tick information to provide generic timer
> related tasks:
> - after (runs a word after a specified amount of
> ms
> - every (runs a word every xy ms, a special case
> is
> every-second)
> 
> and a few more words.
> 
> In the timer-test.frt are some use cases.
> 
> The routines assume a multitasking environment,
> esp the "every" part will block any interaction
> if called in the command line task. pause is
> called
> very often (the word passed to every is not
> executed
> in background but the whole thing may be used in
> background tasks)
> 
> There may be some additional delay (2ms per cycle)
> as per
> 
> : test-every-second @tick u. key? ;
> ' test-every-second every-second
> 439 1441 2443 3445 4447 5449 6451 7453 8455 9457
> 10459  ok
> 
> so the "after" means "at least wait xy
> milliseconds, maybe more."
> (serial IO needs its time)
> 
> I'm currently happy with what the words do (good
> enough).
> Next step is to write some recipes on how to use
> the library.
> 
> 
> Matthias
> 
> PS: to find the optimal settings for the TWI/I2C
> I've written a small
> web-calculator at
> http://amforth.sourceforge.net/recipes/twi.html
> 
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