Re: [Flashforth-devel] Microsecond counter problem, please help

[Laszlo K. <Ko...@ce...>]

> You have the wrong interrupt vector number.

Indeed, it is my fault!

Thanks for the improved 'timer.fs' I am going to study it!

Thaks again!

Laci

On Sun, 2021-10-31 at 06:36 +0200, Mikael Nordman wrote:
> László,
> 
> Just to show you an example of how to scale and format numbers
> I added printing of the time in microseconds.
> 
> In idle mode you can see that the measured time is always the same
> because the execution of TIMERTEST is in sync with the millisecond 
> interrupt.
> 
> In busy mode the execution time varies with 1 milliseconds depending
> on 
> the
> phase relationship of the TIMERTEST command and the millisecond
> timer0.
> 
> idle hex  ok<$,ram>
> timertest
> counter: 18781d
> time: 100225.812 us
>   ok<$,ram>
> timertest
> counter: 18781d
> time: 100225.812 us
>   ok<$,ram>
> busy hex  ok<$,ram>
> timertest
> counter: 18a140
> time: 100884.0 us
> decimal  ok<#,ram>
> timertest
> counter: 1601046
> time: 100065.375 us
> 
> 
> BR Mikael
> 
> 
> On 2021-10-30 20:46, Stefan wrote:
> > Did you check the word 'load'? If it exists, Timer1 is used by the
> > system-load-counter. For other purposes TCNT1 is 'read only' then.
> > You could use 'us' (from the 'avr/forth'-subdirectory) to wait for
> > a
> > specified number of microseconds.
> > 
> > If Timer1 is free for use -> see timertest.fs
> > 
> > greetz bitflipser
> > 
> > 
> > Am 30.10.2021 um 04:59 schrieb Mikael Nordman:
> > > You have the wrong interrupt vector number.
> > > 
> > > #14 constant TIMER1_OVF_vect
> > > 
> > > BR Mikael
> > > 
> > > On 2021-10-29 14:05, Laszlo Kollar wrote:
> > > > I am newbie in forth and especially MCUs
> > > > I would like to ask for help.
> > > > I would like to write a driver for DHT-22 humidity/thermo
> > > > sensor. It
> > > > needs measure microsecond resolution changes in pin state, so I
> > > > wrote 
> > > > a
> > > > small code in order to count microseconds based on this
> > > > article:
> > > > https://www.reddit.com/r/arduino/comments/1q1chr/using_timer1_to_count_clock_cycles/
> > > > 
> > > > 
> > > > I try to implement it but failed in several various ways.
> > > > once it looks like stuck in a infinity reset, sometimes no
> > > > prompt 
> > > > after
> > > > running, sometimes flood garbage when use 'words' after running
> > > > the
> > > > code.
> > > > 
> > > > What mistake I made in this code?
> > > > Please help me!
> > > > 
> > > > Thanks in advance!
> > > > 
> > > > László Kollár
> > > > 
> > > > _______________________________________________
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> > > 
> > 
> > 
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