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jm_eztimer.spin
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jm_eztimer.spin
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'' =================================================================================================
''
'' File....... jm_eztimer.spin
'' Purpose.... Asyncrhonous (accumulator) timer
'' -- methods must be called every ~53.687s (80MHz) or sooner to prevent rollover
'' Author..... Jon "JonnyMac" McPhalen
'' Copyright (c) 2014 Jon McPhalen
'' -- see below for terms of use
'' E-mail..... [email protected]
'' Started....
'' Updated.... 23 MAY 2014
''
'' =================================================================================================
con
var
long sync ' sync point (snapshot of cnt)
long tix ' ticks accumulator
long tms ' ticks per millisecond
long ms ' milliseconds accumulator
pub start
'' Start or restart the timer object
startx(cnt) ' start now
pub startx(spoint)
'' Start the timer object with specific sync point
'' -- for synchronizing with another timer
sync := spoint ' set sync point
tms := clkfreq / 1_000 ' set ticks/millisecond
tix := 0 ' reset ticks accumulator
ms := 0 ' reset milliseconds accumulator
pub millis
'' Returns milliseconds accumulator
mark ' update timer
return ms ' return milliseconds
pub seconds
'' Returns seconds (from ms accumulator)
mark ' update timer
return ms / 1000 ' return seconds
pub adjust(msoffset)
'' Adjust milliseconds register
mark
ms += msoffset
pub mark | now, delta
'' Marks the current point
'' -- updates ticks and ms accumulators
'' -- returns current milliseconds
now := cnt ' capture cnt
delta := now - sync ' delta since last capture
if (delta < 0) ' rollover past posx?
ms += posx / tms ' add posx millis
delta += posx + (posx // tms) + 2 ' correct delta
tix += delta ' increment ticks
ms += tix / tms ' update millis
tix //= tms ' udpate ticks
sync := now ' reset sync point
return ms ' return millis
pub get_sync
'' Returns sync point
'' -- used to syncronize multiple timers
return sync
dat { license }
{{
Terms of Use: MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be included in all copies
or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
}}