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cc3200 Timers, reset to zero in program

josmchale
Prodigy 80 points

Other Parts Discussed in Thread: ENERGIA, CC3200

I am counting external pulses of a shaft encoder using a timer counting external events.

All of this works OK, but when i have finished counting i need to start counting again on the same pin but the timer/counter resumes the count from where it finished the previous count e.g. count finishes at 12345 and when the counter starts again it starts from 12345.

I have tried disabling the counter/timer and enabling it again but it still starts from the previous count of the timer.

The only way that i can see to reset the counter/timer to zero is to preform a hardware reset ( pressing the reset button )

Is there any way i can reset the counter to zero in code while the program is running.

Any help would be appreciated. 

  • 0
    Intellectual 565 points
    Just try,

    void YourTimerFunction(void){

    unsigned long ulInts;
    ulInts = MAP_TimerIntStatus(ulBase, true); // ulBase is your current Timer, e.g. TIMERA0_BASE.
    //
    // Clear the timer interrupt.
    //
    MAP_TimerIntClear(ulBase, ulInts);
    ...
  • 0 in reply to Helio Neves
    Prodigy 80 points

    Thanks for the reply,

    Where should this code be placed to reset the timers to 0.

    I have tried to put it before the timer is enabled and while it is enabled but it hasn't had any effect.

    It should be noted that I have an interrupt on this timer. The interrupt is triggered on a timer match value.

    Regards

    josmchale

  • 0 in reply to josmchale
    Intellectual 565 points
    Past on the first line of your interrupt.

    unsigned long ulInts;
    ulInts = MAP_TimerIntStatus(ulBase, true); // ulBase is your current Timer, e.g. TIMERA0_BASE.
    //
    // Clear the timer interrupt.
    //
    MAP_TimerIntClear(ulBase, ulInts);

    Should work!
  • 0 in reply to Helio Neves
    Prodigy 80 points

    This is my interrupt currently

    static void CalibrationTimerIntHandler() {
    MAP_TimerIntClear(TIMERA0_BASE, TIMER_CAPA_MATCH);// Clear the interrupt

    }

    It does reset the counter on a timer A match it is similar to your suggestion i that TIMER_CAPA_MATCH is the value in your "ulInts", however the pulses to be counted will never end on the interrupt as there is a different amount of counts each run. which means the counter is never at 0 when finished. 

    I need a way i can reset the counter separate to this code. maybe i should set up the timer again using an internal trigger and run the timer until the next interrupt and then use the code you suggested along with a timer disable which would stop the timer at 0.

    If there is a simpler way of resetting the timer it would be easier.

  • 0 in reply to josmchale
    TI__Expert 5660 points
    Hi josmchale,

    There was a similar requirement discussed in the below thread. Please see if it helps.
    e2e.ti.com/.../398262

    Thanks and Regards,
    Siddaram
  • 0 in reply to Siddaram Mathapathi
    Prodigy 80 points

    Hi Siddaram,

    Thanks for the advice,

    I used the  GPTMTAV Register to dynamically change the counter value ( see Table 9-27. GPTMTAV Register Field Descriptions), as mention in the thread you suggested.

    The code i use was : " HWREG(TIMERA0_BASE + TIMER_O_TAV) = 0; " this set the timer A value to zero.

    Thanks for the help, it has save me a lot of time.

    Regards,

    josmchale

  • 0
    Intellectual 390 points
    Hi I think that you have worked on CC3200. I am new to cc3200 coding. I am using Energia.
    Can you tell how to use timers in CC3200.
    I am stuck in a problem.
    Either my timer is not working or I am not getting the compare match interrupt.

    below is my code

    #include<Energia.h>
    #include "inc/hw_ints.h"
    #include "inc/hw_memmap.h"
    #include "inc/hw_timer.h"
    #include "inc/hw_types.h"
    #include "debug.h"
    #include "interrupt.h"
    #include "timer.h"
    #include "driverlib/prcm.h"
    #include "inc/hw_gprcm.h"
    #include "wiring_private.h"
    #include "driverlib/rom_map.h"
    #include "driverlib/pin.h"


    void setup()
    {
    pinMode(2,INPUT_PULLUP);
    pinMode(4,OUTPUT);
    noInterrupts();
    PRCMPeripheralClkEnable(PRCM_TIMERA1,PRCM_RUN_MODE_CLK);

    PRCMPeripheralReset(PRCM_TIMERA1);

    TimerConfigure(TIMERA1_BASE,TIMER_CFG_A_PERIODIC_UP);

    TimerIntRegister(TIMERA1_BASE,TIMER_A,start);

    TimerIntEnable(TIMERA1_BASE,TIMER_TIMA_MATCH);

    TimerPrescaleSet(TIMERA1_BASE,TIMER_A,32);

    TimerMatchSet(TIMERA1_BASE,TIMER_A,7500);

    TimerLoadSet(TIMERA1_BASE,TIMER_A,0);

    TimerEnable(TIMERA1_BASE,TIMER_A);
    attachInterrupt(2,zeroCrossingInterrupt, RISING);
    interrupts();
    Serial.begin(9600);
    }


    void loop()
    {
    }

    void zeroCrossingInterrupt()
    {
    digitalWrite(4,LOW);

    TimerEnable(TIMERA1_BASE,TIMER_A);

    Serial.println("0k");
    }

    void start()
    {
    digitalWrite(4,HIGH);

    TimerDisable(TIMERA1_BASE,TIMER_A);

    Serial.println("hi");

    }