task_sleep blocked

Horea Aflat

Intellectual 280 points

Other Parts Discussed in Thread: SYSBIOS, TM4C1294NCPDT

Good day,

I am using TI-RTOS with TM4C.

Sometimes my application remains hang-up in Task_sleep(5).

It is not happens all the time but enough often.

I attached the stack.

Searching in logs I found that a normal sequence of tasks switch looks like:

But in my case when remains blocked in Task_sleep the log is:

Basically will never log Task_LD_ready.

The task 0x___8340 is my main task and 0x___84bc is the idle task.

Thanks

Horea

over 9 years ago

0 judahvang over 9 years ago

TI__Mastermind 32475 points

Horea,

What version of SYSBIOS are you using?

Usually when there is a hang in Task_sleep() it means the BIOS clock tick is no longer running or somehow messed up.
The BIOS clock is usually driver by a Timer. Is that timer somehow getting reset or trashed?
Are you using some Power function that could be disabling the Timer?

Judah

0 Horea Aflat over 9 years ago in reply to judahvang

Intellectual 280 points

Judah,

I am using bios_6_42_01_20 with CCS 6.1.1.
I do not use Power functions.

Thanks
Horea

0 Horea Aflat over 9 years ago in reply to Horea Aflat

Intellectual 280 points

0 Horea Aflat over 9 years ago in reply to Horea Aflat

Intellectual 280 points

Judah,

For the micro-controller TM4C1294NCPDT we do not have a RTC.
Do you think it is a problem for Task_sleep function?

Thanks
Horea

0 Horea Aflat over 9 years ago in reply to Horea Aflat

Intellectual 280 points

Is there any influence between Task_sleep and sprintf from <cstdio>?

Please check the attached project.

If sprintf is commented everything is working well.

When Task_sleep and sprintf are actrive both the app crashes.

4024.TaskSleep.zip

0 judahvang over 9 years ago in reply to Horea Aflat

TI__Mastermind 32475 points

1. BIOS doesn't require an RTC. Any Timer should work, however, typically when going into low power modes, most timers are shutoff but usually not the RTC.
So in other words, if you were going into low power modes where the Timer clocks are cut off...that would be a problem.

2. As far as sprintf goes. You need to understand that a call to sprintf (or any printf like APIs but not XDC's System_printf) breaks real-time. Basically, the
function halts the processor. There is not direct correlation between Task_sleep() and sprintf, but you can see that if you're sleep time is very small,
its possible it can be missed if you do a bunch of sprintf. Furthermore, you should not be doing any sprintf in an ISR function.

In the case when Task_sleep is hung...where is the program? Is the program crashed or just spinning? If just spinning, can you open up ROV and see if the Clock tick is still increasing?

Judah

0 Horea Aflat over 9 years ago in reply to judahvang

Intellectual 280 points

Judah,

I checked and Clock tick is not increasing.
Which means?

Thanks
Horea

0 Horea Aflat over 9 years ago in reply to Horea Aflat

Intellectual 280 points

The fix for error is:
1. Do not use sprintf.
2. Configuration file\SYSBIOS\Scheduling\Clock: TickMode=Interrupt every period; TimeId=7 (should be different by ANY).

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task_sleep blocked