RTOS/TM4C129CNCPDT: Clock module does not work in TickMode_DYNAMIC dome on TM4C129

Tool/software: TI-RTOS

Hello,

I have issue with TI-RTOS on TM4C129 CPU.

I create simple task:

#define MS_TO_TICK(x) ((x) * 1000 / Clock_tickPeriod)
static void TestTask_Fxn(UArg arg0, UArg arg1)
{
    while(1) {
        APP_INFO("%d\n", Clock_getTicks());
        Task_sleep(MS_TO_TICK(1000));
    }
}

It works correctly with Clock module configuration:

BIOS.cpuFreq.lo = 120000000;
Clock.tickMode = Clock.TickMode_PERIODIC;
Clock.timerId = 0;
Clock.tickSource = Clock.TickSource_TIMER;

In debug UART I can see messages:

Default INF: main:cpuFreq.lo 120000000
Default INF: main:Clock_tickPeriod 100000
Default INF: TestTask_Fxn:0
Default INF: TestTask_Fxn:10
Default INF: TestTask_Fxn:20
Default INF: TestTask_Fxn:30
....
Default INF: TestTask_Fxn:1760
...

But if I change mode to Clock.tickMode = Clock.TickMode_DYNAMIC;

Task is stop execution after some time.
Debug output is:

Default INF: main:cpuFreq.lo 120000000
Default INF: main:Clock_tickPeriod 100000
Default INF: TestTask_Fxn:0
Default INF: TestTask_Fxn:10
...
Default INF: TestTask_Fxn:340
Default INF: TestTask_Fxn:350
Default INF: TestTask_Fxn:707

Default INF: TestTask_Fxn:707 is the last message that I see. In the ROV I see that task is blocked on Task_sleep(357 (stale data)) but in normal operation it shows Task_sleep(10 (stale data)).

I add Idle task with following code:

UARTprintf("s %d\n", Clock_getTicks());

Got debug output:

Default INF: main:cpuFreq.lo 120000000
Default INF: main:Clock_tickPeriod 100000
Default INF: TestTask_Fxn:0
s 0
s 0
...
s 9
s 9
Default INF: TestTask_Fxn:10
s 10
...
s 350
Default INF: TestTask_Fxn:350
Default INF: TestTask_Fxn:707
s 708
s 708
...
s 709
...
s 1064
s 707

After my task stop execution idle task continue prints Ticks value. It is strange that next value after 1064 is 707.

I want to use Clock.TickMode_DYNAMIC mode to improve power consumption, want go to sleep in Idle task.

Add sleep in Idle:

uint32_t start_ticks = Clock_getTicks();
UARTprintf("s %d\r\n", start_ticks);
SysCtlSleep();
uint32_t stop_ticks = Clock_getTicks();
UARTprintf("%d %d\r\n", start_ticks, stop_ticks);

Output:

[2018-04-13 14:53:51.047] Default INF: main:cpuFreq.lo 120000000
[2018-04-13 14:53:57.920] Default INF: main:Clock_tickPeriod 100000
[2018-04-13 14:53:57.925] Default INF: TestTask_Fxn:0
[2018-04-13 14:53:57.927] s 0
[2018-04-13 14:53:57.928] 0 1
[2018-04-13 14:53:58.018] s 1
[2018-04-13 14:53:58.018] 1 10
[2018-04-13 14:53:58.918] Default INF: TestTask_Fxn:10
[2018-04-13 14:53:58.921] s 10
[2018-04-13 14:53:58.921] 10 20
[2018-04-13 14:53:59.918] Default INF: TestTask_Fxn:20
[2018-04-13 14:53:59.921] s 20
....
[2018-04-13 14:54:31.923] Default INF: TestTask_Fxn:340
[2018-04-13 14:54:31.926] s 340
[2018-04-13 14:54:31.927] 340 707
[2018-04-13 14:54:32.924] Default INF: TestTask_Fxn:350
[2018-04-13 14:54:32.927] Default INF: TestTask_Fxn:707
[2018-04-13 14:54:32.929] s 708
[2018-04-13 14:54:32.930] 708 707
[2018-04-13 14:55:08.625] s 707
[2018-04-13 14:55:08.626] 707 707
[2018-04-13 14:55:44.418] s 707
[2018-04-13 14:55:44.418] 707 707
[2018-04-13 14:56:20.211] s 707
[2018-04-13 14:56:20.211] 707 707

As you can see CPU sleeps in Idle task and wakeup periodically (time0 interrupt is wake up source I think)
But after some time (340 - 350 ticks) Clock modules stops counting.

What is wrong with TI-RTOS Clock module?
I use tirtos_tivac_2_16_00_08

Best regards,

Michael