Hi,
When i compiled the following program , (taken from
/usr/src/linux/Documentation/rtc.txt )
(See attached file: rtc2.c)
it gave me the following error:
[root@msatuts1 timer1]# gcc -s -Wall -Wstrict-prototypes rtc2.c -o rtc2
In file included from rtc2.c:17:
/usr/include/linux/mc146818rtc.h:29: parse error before `rtc_lock'
/usr/include/linux/mc146818rtc.h:29: warning: data definition has no type or
storage class
rtc2.c:25: warning: return type of `main' is not `int'
[root@msatuts1 timer1]#
Is this a bug?Can anyone tell me how to remove this parse error ?
With Regards,
--Niraj
---------------------- Forwarded by Niraj Punmia/HSS on 04/20/2001 04:31 PM
---------------------------
Niraj Punmia
04/12/2001 02:50 PM
To: [email protected]
cc:
Subject: RTC !!
Hi ,
The RTC interrupt is programmable from 2 Hz to 8192 Hz, in powers of 2. So the
interrupts that you
could get are one of the following: 0.122ms, .244ms, .488ms, .977ms,
1.953ms, 3.906ms, 7.813ms, and so on. Is there any workaround , so that i
can use RTC
for meeting my requirement of an interrupt every 1.666..ms!! ( I know that i
can use UTIME or #define HZ 600, but i want to know if i can use RTC for this
purpose )
With Regards,
--Niraj
---------------------- Forwarded by Niraj Punmia/HSS on 04/12/2001 02:33 PM
---------------------------
James Stevenson <[email protected]> on 04/09/2001 06:42:44 PM
Please respond to [email protected]
To: Niraj Punmia/HSS@HSS
cc:
Subject: Re: 1.6666.... ms interrupts needed!!
Hi
instead of modifing the time irq freq you could try using the
realt time clock (rtc) it will generate irqs with better timing
and you also wont hit system performance as much by modifing the timer
ever time the timer send an irq some code is run to see it schedule need
to be called the more times schedule is called a second the worse the
system performance is because of the task switching overhead.
In local.linux-kernel-list, you wrote:
>
>
>
>Hi.
>
>We are simulating air interface of GPRS on LAN. A TDMA(time division multiple
>access) frame duration is 40ms. Each TDMA frame consists of 24 timeslots. Each
>timeslot is of 40/24 ms (i.e 1.66666.......ms) . To know what current
>timeslot it is, we need a timer interrupt after every 1.6666... ms . Since we
>are implementing this on LAN, minor jitters once in a while can be tolerated
>(say 0.2 ms more or less once a while would be OK).
> As of now, we are modifying the HZ value in param.h to 600. This gives us
>a CPU tick of 1.6666.... ms. (i.e 1/600sec). I want to know if it would
affect
>the perfomance of the CPU.
> Is there a better way to achieve the granularity of 1.666...ms . Would
the
>UTIME patch be a better way from performance or any other point of view than
>this method?
>
>With Regards,
>Niraj Punmia
>
>
>
>-
>To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>the body of a message to [email protected]
>More majordomo info at http://vger.kernel.org/majordomo-info.html
>Please read the FAQ at http://www.tux.org/lkml/
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---------------------------------------------
Check Out: http://stev.org
E-Mail: [email protected]
1:10pm up 13 days, 21:05, 5 users, load average: 0.45, 0.45, 0.47
[email protected] wrote:
> Hi,
>
> When i compiled the following program , (taken from
> /usr/src/linux/Documentation/rtc.txt )
>
> (See attached file: rtc2.c)
>
> it gave me the following error:
>
> [root@msatuts1 timer1]# gcc -s -Wall -Wstrict-prototypes rtc2.c -o rtc2
> In file included from rtc2.c:17:
> /usr/include/linux/mc146818rtc.h:29: parse error before `rtc_lock'
> /usr/include/linux/mc146818rtc.h:29: warning: data definition has no type or
> storage class
> rtc2.c:25: warning: return type of `main' is not `int'
> [root@msatuts1 timer1]#
>
> Is this a bug?Can anyone tell me how to remove this parse error ?
It works fine for me using a 2.2.16 kernel and egcs-2.91.66 (see below)...
bash-2.04$ gcc -s -Wall -Wstrict-prototypes rtc2.c -o rtc2
rtc2.c:24: warning: return type of `main' is not `int'
bash-2.04$ ./rtc2
RTC Driver Test Example.
Counting 5 update (1/sec) interrupts from reading /dev/rtc: 1 2 3 4 5
Again, from using select(2) on /dev/rtc: 1 2 3 4 5
Current RTC date/time is 20-4-2001, 12:34:01.
Alarm time now set to 12:34:06.
Waiting 5 seconds for alarm... okay. Alarm rang.
Periodic IRQ rate was 1024Hz.
Counting 20 interrupts at:
2Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
4Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
8Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
16Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
32Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
64Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
*** Test complete ***
Typing "cat /proc/interrupts" will show 131 more events on IRQ 8.
bash-2.04$
Regards,
Jesper Juhl
[email protected]
Can someone help me with this !!!
With Regards,
--Niraj
Niraj Punmia
04/21/2001 03:42 PM
To: Jesper Juhl <[email protected]>
cc:
Subject: Re: RTC ! (Document link not converted)
The version of gcc , i am using is also egcs-2.91.66 !! How come i am getting
this problem???
Jesper Juhl <[email protected]> on 04/20/2001 07:34:47 PM
To: Niraj Punmia/HSS@HSS
cc:
Subject: Re: RTC !
[email protected] wrote:
> I am using Linux 2.2.18 with KURT patch installed! I don't know which gcc/
egcs
> i am using ? How do we check it?
gcc --version
/Jesper Juhl
---------------------- Forwarded by Niraj Punmia/HSS on 04/21/2001 04:10 PM
---------------------------
Niraj Punmia
04/20/2001 05:29 PM
To: Jesper Juhl <[email protected]>
cc:
Subject: Re: RTC ! (Document link not converted)
I am using Linux 2.2.18 with KURT patch installed! I don't know which gcc/ egcs
i am using ? How do we check it?
--Regards,
--Niraj
Jesper Juhl <[email protected]> on 04/20/2001 06:08:57 PM
To: Niraj Punmia/HSS@HSS
cc: [email protected]
Subject: Re: RTC !
[email protected] wrote:
> Hi,
>
> When i compiled the following program , (taken from
> /usr/src/linux/Documentation/rtc.txt )
>
> (See attached file: rtc2.c)
>
> it gave me the following error:
>
> [root@msatuts1 timer1]# gcc -s -Wall -Wstrict-prototypes rtc2.c -o rtc2
> In file included from rtc2.c:17:
> /usr/include/linux/mc146818rtc.h:29: parse error before `rtc_lock'
> /usr/include/linux/mc146818rtc.h:29: warning: data definition has no type or
> storage class
> rtc2.c:25: warning: return type of `main' is not `int'
> [root@msatuts1 timer1]#
>
> Is this a bug?Can anyone tell me how to remove this parse error ?
It works fine for me using a 2.2.16 kernel and egcs-2.91.66 (see below)...
bash-2.04$ gcc -s -Wall -Wstrict-prototypes rtc2.c -o rtc2
rtc2.c:24: warning: return type of `main' is not `int'
bash-2.04$ ./rtc2
RTC Driver Test Example.
Counting 5 update (1/sec) interrupts from reading /dev/rtc: 1 2 3 4 5
Again, from using select(2) on /dev/rtc: 1 2 3 4 5
Current RTC date/time is 20-4-2001, 12:34:01.
Alarm time now set to 12:34:06.
Waiting 5 seconds for alarm... okay. Alarm rang.
Periodic IRQ rate was 1024Hz.
Counting 20 interrupts at:
2Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
4Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
8Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
16Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
32Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
64Hz: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
*** Test complete ***
Typing "cat /proc/interrupts" will show 131 more events on IRQ 8.
bash-2.04$
Regards,
Jesper Juhl
[email protected]
To: [email protected]
cc:
Subject: RTC !
Hi,
When i compiled the following program , (taken from
/usr/src/linux/Documentation/rtc.txt )
(See attached file: rtc2.c)
it gave me the following error:
[root@msatuts1 timer1]# gcc -s -Wall -Wstrict-prototypes rtc2.c -o rtc2
In file included from rtc2.c:17:
/usr/include/linux/mc146818rtc.h:29: parse error before `rtc_lock'
/usr/include/linux/mc146818rtc.h:29: warning: data definition has no type or
storage class
rtc2.c:25: warning: return type of `main' is not `int'
[root@msatuts1 timer1]#
Is this a bug?Can anyone tell me how to remove this parse error ?
With Regards,
--Niraj