ESP32 Forum

Posted: **Fri Apr 10, 2020 1:04 am**

Hey,
So I followed the implementation of timer interrupt (https://github.com/espressif/esp-idf/bl ... ple_main.c ). It worked perfectly but now I want to disable and then re enable the interuption caused by Group 0 Timer 1 's alarm, and I can't seem to disable the interrupt.

This is the timer's config and init

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void timerGrp0Init(int timer_idx, double timer_interval_sec){
    /* Select and initialize basic parameters of the timer */
    timer_config_t config;
    config.divider = TIMER_DIVIDER;
    config.counter_dir = TIMER_COUNT_UP;
    config.counter_en = TIMER_PAUSE;
    config.alarm_en = TIMER_ALARM_EN;
    config.intr_type = TIMER_INTR_LEVEL;
    config.auto_reload = 1;
#ifdef TIMER_GROUP_SUPPORTS_XTAL_CLOCK
    config.clk_src = TIMER_SRC_CLK_APB;
#endif
    timer_init(TIMER_GROUP_0, timer_idx, &config);
 
    /* Timer's counter will initially start from value below.
       Also, if auto_reload is set, this value will be automatically reload on alarm */
    timer_set_counter_value(TIMER_GROUP_0, timer_idx, 0x00000000ULL);
 
    /* Configure the alarm value and the interrupt on alarm. */
    timer_set_alarm_value(TIMER_GROUP_0, timer_idx, timer_interval_sec * TIMER_SCALE);
    timer_enable_intr(TIMER_GROUP_0, timer_idx);
    timer_isr_register(TIMER_GROUP_0, timer_idx, timerGrp0Isr, (void*)timer_idx, ESP_INTR_FLAG_IRAM, NULL);
 
    timer_start(TIMER_GROUP_0, timer_idx);
}

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This is the ISR:

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void IRAM_ATTR timerGrp0Isr(void *para){                            //This interrupt is handled by CPU1
    int timer_idx = (int)para;
    timer_spinlock_take(TIMER_GROUP_0);
 
    //Wake acqAdc2 in order to start ADC readings from adc2. CPU0 will start immediatly acquiring
    vTaskNotifyGiveFromISR(acquiring_2_task, (BaseType_t*)NULL);
 
    //Wake acqAdc1 in order to start ADC readings form adc1. This will only start when this handler is terminated.
    vTaskNotifyGiveFromISR(acquiring_1_task, (BaseType_t*)NULL);
 
    //Clear the interrupt
    timer_group_clr_intr_status_in_isr(TIMER_GROUP_0, timer_idx);
 
    //After the alarm has been triggered we need enable it again, so it is triggered the next time
    timer_group_enable_alarm_in_isr(TIMER_GROUP_0, timer_idx);
 
    timer_spinlock_give(TIMER_GROUP_0);
}

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And then, when acquiring_1_task receives the notification, it immediately disables the interrupt like so:

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void acqAdc1(){
    //Init Timer 0_1 (timer 1 from group 0) and register it's interupt handler
    timerGrp0Init(TIMER_1, TIMER1_INTERVAL_SEC);
 
    //Config all possible adc channels
    configSixAdcChannels(ADC_RESOLUTION);
 
    while(1){
        if(ulTaskNotifyTake(pdTRUE, ONE_HOUR_MS/portTICK_PERIOD_MS ) == 1){     //THIS IS WHERE THE TASK RECIEVES THE NOTIFICATION
            
 
            if(timer_disable_intr(TIMER_GROUP_0, 1) == ESP_OK){
                printf("Disable ok\n");
            }
 
            //TODO clear acq_config.adc1_num_channels
        }else{
            DEBUG_PRINT(W, "acqAdc1", "ulTaskNotifyTake timed out!");
        }
    }
}

The thing is, I keep getting periodically the interruption after the disable has been made, does someone know what I'm doing wrong?

Thanks in advance

ESP32 Forum

Can't disable Timer interrupt

Can't disable Timer interrupt