RTOS/CC1310: Clock problem

Tool/software: TI-RTOS

Hello!

I tried to make a simple example of using Clock and got the following result. Why is this happening ?

#include <ti/sysbios/knl/Clock.h>


Clock_Struct MainClock;

void mainClockFxn(UArg arg0)
{
    GPIO_toggleDio(CC1310_LAUNCHXL_PIN_RLED);
}

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{

    uint32_t period = 125/Clock_tickPeriod;
    Clock_Params clkParams;
    Clock_Params_init(&clkParams);
    clkParams.period = period;
    clkParams.startFlag = TRUE;
    Clock_construct(&MainClock, (Clock_FuncPtr)mainClockFxn, period, &clkParams);

    while(1);
}

On the oscillograph I observe very frequent PIN switching through 4.64 uS