From: "ariga masahiro" <ariga@link-lab.co.jp>
To: "eCos Discuss" <ecos-discuss@ecos.sourceware.org>,
"Paul D. DeRocco" <pderocco@ix.netcom.com>
Cc: "Andrew Lunn" <andrew@lunn.ch>
Subject: Re: [ECOS] Re: In trouble of timer operations
Date: Thu, 05 Jun 2008 06:14:00 -0000 [thread overview]
Message-ID: <001301c8c6d3$66400590$1c0110ac@ariga> (raw)
In-Reply-To: <PGEAIGBPLOMOJDAPCOJHGECCLAAB.pderocco@ix.netcom.com>
Hello Paul,Andrew and others,
Thank you,Paul,for valuable suggestion.
I re_calculated by toggling LED and measured signal's duration on
osilloscope.
result
(1) only used cyg_thread_delay(2) -- 20.2millisec
(2) cyg_thread_delay(1),cyg_thread_delay(2) -- 30.1millisec
(3) same as (2) except changed cyg_thread_delay(2) to
yg_thread_delay(20) -- 212millisec
(4) only used cyg_thread_delay(20) -- 201millisec
I am confirmed in thinking that since CYGNUM_HAL_RTC_DENOMINATOR=100, system
clock is running 100Hz,1 tick perid = 10millisec,and if I wish to run system
clock 200Hz I should change CYGNUM_HAL_RTC_DENOMINATOR to 200.
But according to your mail, it raised another puzzlement.
> However, you won't find it out very easily with diag_printf, because it
> probably takes longer than 10ms to execute.
At first,I couldn't get it. Because if diag_printf takes over 10ms, simply
calculated results ought be longer,
but on the contrary it took far shorter than expected.
So I deliberately inserted
HAL_CLOCK_READ1(&start);
diag_printf("id=hi 0x%x\n",start);
in above each test(after led_toggle function) and investigated how it
affects duration time.
To my very astonishment as far as looking signals on osilloscope there are
no differences !
Two functions takes no time at all as far as looking to signals.
Can you resolve this wonder.
Please enlighten me.
Masahiro Ariga
>> From: ariga masahiro [mailto:ariga@link-lab.co.jp]
>>
>> I am afraid I dig up the same question but I think this is important,at
>> least for me,
>> so please forgive my inquiring again.
>> The problem is return_time of cyg_thread_delay.I am determined to
>> use TMU1
>> as Free-Run Counter(0xffffffff-0)
>> and made function(HAL_CLOCK_READ1) to read TMU1 clock count.I am affirmed
>> it's working correctry.
>> I used it to calculate return time in hipri_test() in timeslice2.c.
>> I am baffled by the result.
>>
>> --testing code
>> hipri_test(CYG_ADDRESS id)
>> {
>> cyg_int32 start;
>>
>> while( 1 )
>> {
>> HAL_CLOCK_READ1(&start);
>> diag_printf("id=hi 0x%x\n",start);
>> cyg_thread_delay(1);
>> cyg_thread_delay(2);
>> }
>> }
>> I calculated several cases.
>> (1) I only used cyg_thread_delay(2)
>> (2) I used Andrew's proposition of using
>> cyg_thread_delay(1),cyg_thread_delay(2) like above code.
>> (3) same as (2) except changed cyg_thread_delay(2) to
>> cyg_thread_delay(20)
>> (4) only used cyg_thread_delay(20)
>
> It's possible that there's something wrong with the timer configuration.
> However, you won't find it out very easily with diag_printf, because it
> probably takes longer than 10ms to execute.
>
> I don't know what hardware you're using, but most evaluation boards have
> utility LEDs or output port pins. Instead of outputting a message, toggle
> a
> port pin and look at it with a scope or a frequency counter.
>
> --
>
> Ciao, Paul D. DeRocco
> Paul mailto:pderocco@ix.netcom.com
>
--
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next prev parent reply other threads:[~2008-06-05 6:14 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-07 23:59 [ECOS] Wrongfully compiled code ariga masahiro
2008-01-08 0:05 ` Gary Thomas
2008-01-08 1:05 ` ariga masahiro
2008-01-17 19:21 ` [ECOS] " Dave Lawrence
2008-01-17 23:50 ` ariga masahiro
2008-01-18 12:16 ` Dave Lawrence
2008-01-18 14:40 ` Gregg Levine
2008-01-18 15:44 ` Dave Lawrence
2008-01-18 15:49 ` Gregg Levine
2008-01-18 16:09 ` Dave Lawrence
2008-01-21 0:34 ` ariga masahiro
2008-02-04 1:49 ` ariga masahiro
2008-02-04 11:38 ` Dave Lawrence
2008-02-12 1:06 ` ariga masahiro
2008-02-12 10:55 ` Dave Lawrence
2008-02-22 4:57 ` [ECOS] How to re-install newly compiled gnutools ariga masahiro
2008-02-22 7:15 ` ariga masahiro
2008-05-16 8:13 ` [ECOS] When or on what condition does "deschedule" happen? ariga masahiro
2008-05-16 15:26 ` Andrew Lunn
2008-05-19 5:32 ` ariga masahiro
2008-05-19 13:18 ` Andrew Lunn
2008-05-19 13:31 ` Gary Thomas
2008-05-20 1:26 ` ariga masahiro
2008-05-20 12:18 ` Andrew Lunn
2008-05-23 7:38 ` ariga masahiro
2008-05-23 9:35 ` Nick Garnett
[not found] ` <000601c8c165$406e0970$1c0110ac@ariga>
2008-05-29 18:23 ` [ECOS] Re: In trouble of timer operations Andrew Lunn
2008-05-30 2:50 ` ariga masahiro
2008-05-30 3:09 ` Paul D. DeRocco
2008-05-30 4:11 ` ariga masahiro
2008-05-30 4:43 ` Paul D. DeRocco
2008-05-30 7:26 ` ariga masahiro
2008-05-30 7:47 ` Paul D. DeRocco
2008-05-30 8:03 ` ariga masahiro
2008-05-30 8:07 ` Andrew Lunn
2008-06-04 5:25 ` ariga masahiro
2008-06-04 10:06 ` Paul D. DeRocco
2008-06-05 6:14 ` ariga masahiro [this message]
2008-06-05 17:39 ` Paul D. DeRocco
2008-05-30 6:35 ` Andrew Lunn
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