2011-04-26 09:34:10 bfin_simple_timer start issue

Chandrashekhar Lavania (INDIA)

Message: 100168

Hi,

I am using a BF527 based board, TLL6527M. I wrote a simple app to test timer operation using bfin_simple_timer. The app works fine but there are some issues. Here is what I did:

1. I loaded the module using modprobe bfin_simple_timer

Result -> Entries for timer appear in /dev as /dev/timer0 to /dev/timer7 . Also a Read Only file is created as /proc/bfin_simple_timer

2. Executed my app.

Result -> Timer failed to start. In /proc/bfin_simple_timer all values are zero.

3. Waited for... a minute I guess...Re Executed my app

Result -> This time I get non zero values in /proc/bfin_simple_timer

For each subsequent execution of my app, the timer values were incremented by almost the same amount, which is correct.

This happens whenever I restart my system and need to load the bfin_simple_timer module.

What might be the cause of this lag?

Regards,

Shekhar

PS: I am using 2010R1-RC5

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2011-04-26 22:39:55 Re: bfin_simple_timer start issue

Aaron Wu (CHINA)

Message: 100181

Could you attache your test app code?

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2011-04-27 01:29:10 Re: bfin_simple_timer start issue

Sonic Zhang (CHINA)

Message: 100182

When you say "Timer failed to start", what is the error number or message?

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2011-04-27 02:34:37 Re: bfin_simple_timer start issue

Chandrashekhar Lavania (INDIA)

Message: 100183

Hi,

No error message.......I have my app in a while loop which only exits after 10 timer interrupts (ticks value in /proc/bfin_simple_timer).

It just hangs there as the timer value doesent get incremented. I aborted the application and checked the values in /proc/bfin_simple_timer....they were all zeros.

If I remove the loop then the app just exits, without any change in timer values. I also added a sleep between start and stop, but still no difference. That lag is still there.

Also if we look at drivers/char/bfin_simple_timer.c :: The ioctl function returns an error( -EINVAL) only if a wrong ioctl command was fed to it.

Regards,

Shekhar

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2011-04-27 03:17:49 Re: bfin_simple_timer start issue

Sonic Zhang (CHINA)

Message: 100189

Please attach you test application.

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2011-04-27 06:52:08 Re: bfin_simple_timer start issue

Chandrashekhar Lavania (INDIA)

Message: 100201

Hi,

I have attached my test app. The executable was called Simple_Timer_Test_V1_0 .

This gave me the following results::

root:/home> modprobe bfin_simple_timer