Repeat timers are similar to oneshot timers, but instead of getting called only once, they get called repeatedly. After a repeat timer has been started, its callback will be executed repeatedly every xTimerPeriod ticks after being started. Since repeat timers are executed within the TmrSvc task, they can provide a lightweight alternative to tasks for short, non-blocking functions that need to be run periodically. The same considerations regarding stack usage and execution time apply to oneshot timers.  

The steps are essentially the same for repeat timers: just set the value of the auto-reload flag to pdTRUE.

Let's take a look at the code in mainSoftwareTimers.c:

TimerHandle_t repeatHandle = 
xTimerCreate(   "myRepeatTimer",         //name for timer
                500 /portTICK_PERIOD_MS, //period of timer in ticks
                pdTRUE,                  //auto-reload flag
                NULL,                    //unique ID for timer
                repeatCallBack);          //callback function
assert_param(repeatHandle != NULL);
xTimerStart(repeatHandle , 0);

The repeating timer will toggle the green LED:

void repeatCallBack( TimerHandle_t xTimer )
{
    static uint32_t counter = 0;
    if(counter++ % 2)
    {
        GreenLed.On();
    }
    else
    {
        GreenLed.Off();
    }
}