Issue with timer extended compare mode

[chandan]

Hello, I want timer to interrupt if timer is not restarted in 200ms and wrote below code.

void timerConfig (void){
    uint32_t time_ticks; 
    uint16_t time_ms;
    //Configure timer
    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    timer_cfg.bit_width =NRF_TIMER_BIT_WIDTH_32;
    timer_cfg.frequency =NRF_TIMER_FREQ_16MHz;
    uint32_t err_code = nrf_drv_timer_init(&controllerTimer, &timer_cfg, oneWireCommunicationTimerTimeouthandler);
    APP_ERROR_CHECK(err_code);
   time_ms = 200;  //200 ms timeout timer
   time_ticks = nrf_drv_timer_ms_to_ticks(&controllerTimer, time_ms);

  nrf_drv_timer_extended_compare(
         &controllerTimer, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK, true);


    nrf_drv_timer_disable(&controllerTimer);
    nrf_drv_timer_clear(&controllerTimer);
    nrf_drv_timer_enable(&controllerTimer);
}

I am restarted timer in few milliseconds using below but still I m getting interrupt. Please suggest.

//re-start the timer
nrf_drv_timer_disable(&controllerTimer);
nrf_drv_timer_clear(&controllerTimer);
nrf_drv_timer_enable(&controllerTimer);

Thanks

[ovrebekk]

Hi 

There's is no need to disable the timer to re-start it. Can you try simply clearing the timer without disabling and enabling it?

Best regards
Torbjørn

[chandan]

Hello, Before clearing timer counter we should stop timer first, Correct ?

[ovrebekk]

Hi

There is no need to stop the timer before clearing it, no. You can clear it at any time. 

Best regards
Torbjørn

[chandan]

Hello, Still I am facing same error. I am attaching my project.

In that I have connected pin P27 and P26 in dev kit. Pin 26 I am generating pulse and interrupt will be generated in pin 27. In pin 28 GPIO interrupt I am clearing timer but still I am getting timer expire interrupt.

uart_Nordic_Timer.zip

[chandan]

ovrebekkHi, Did you get the chance to check ?

[ovrebekk]

Hi 

Do you have a scope or logic analyzer available so you can measure the pin and UART activity?

If so, could you try toggling a separate pin inside the GPIO_handler function to see if it is triggering as expected when there is pin activity on P27?

Best regards
Torbjørn