FreeRTOS Software Timers

API Functions

Create
timerhandle_t xtimercreate (const char * const PCTIMERNAME,
                            const ticktype_t xtimerperiodinticks,
                            Const ubasetype_t Uxautoreload,
                            void * Const Pvtimerid,
                            timercallbackfunction_t pxcallbackfunction)

//Start
#define Xtimerstart (Xtimer, xtickstowait) Xtimergenericcommand ((Xtimer), Tmrcommand_start, 
    ( Xtaskgettickcount ()), NULL, (xtickstowait))
basetype_t Xtimergenericcommand (timerhandle_t xtimer, const BASETYPE _t Xcommandid, 
    const ticktype_t xoptionalvalue, basetype_t * Const Pxhigherprioritytaskwoken, 
    const TICKTYPE _t xtickstowait)

//Stop
#define XTIMERSTOP (Xtimer, xtickstowait) Xtimergenericcommand ((Xtimer), Tmrcommand_ STOP, 
    0U, NULL, (xtickstowait))

Example

void Start_task (void *pvparameters) {//Create software cycle timers.
                                        Cycle 1s (1000 clock beats), Cycle mode autoreloadtimer_handle=xtimercreate ((const char*) "Autoreloadtimer",
                                        (ticktype_t), (ubasetype_t) Pdtrue, (void*) 1, (timercallbackfunction_t)

    Autoreloadcallback); Create a one-time timer.
                                     Cycle 2s (2000 clock beats), single-mode oneshottimer_handle=xtimercreate ((const char*) "Oneshottimer",
                                     (ticktype_t), (ubasetype_t) Pdfalse, (void*) 2, (timercallbackfunction_t) Onesh
Otcallback);
    }//Cycle timer callback function void Autoreloadcallback (timerhandle_t xtimer) {static U8 tmr1_num=0;     tmr1_num++; Cycle timer execution times plus 1 printf ("Autoreloadcallback%d\r\n", tMr1_num);
    }//single-timer callback function void Oneshotcallback (timerhandle_t xtimer) {static U8 Tmr2_num = 0;     tmr2_num++;
Single timer execution times plus 1 printf ("Oneshotcallback%d\r\n", tmr2_num);
        } void Timercontrol_task (void *pvparameters) {while (1) {key = Key_scan (0); Switch (key) {case Wkup_pres://When KEY_UP is pressed, turn on the cycle timer Xtimerstart (Autoreloadtimer_han  dle,0);
                Open Cycle Timer printf ("Turn on Timer 1\r\n");
            Break     Case Key0_pres://When KEY0 is pressed, a single timer xtimerstart (oneshottimer_handle,0) is opened;
                Turn on single timer printf ("Turn on Timer 2\r\n");
            Break   Case Key1_pres://When Key1 is pressed, the timer xtimerstop (autoreloadtimer_handle,0) is turned off;      Close Cycle Timer xtimerstop (oneshottimer_handle,0);
                Turn off the single timer printf ("Off timer 1 and 2\r\n");  
        Break } vtaskdelay (10); Delay 10ms, i.e. 10 clock ticks}}

experimental phenomenon