nrf52840 Timer0 not work

Question

Hello. I am a beginner and I have a nrf52840 Dongle board. I tried to use the interrupt from TIMER0. I defined the timer and it works correctly, but when I enable the interrupt "NVIC_EnableIRQ(TIMER0_IRQn)", it seems that the program jumps to an empty area. What I found from using the timer did not help me. Could you advise me? I am uploading a test project.
Best regards
Jaroslav Štrba.

Jarostr · Accepted Answer

Hello. I solved the problem with the timer interrupt. The problem was solved when I used IRQ_DIRECT_CONNECT(TIMER1_IRQn, IRQ_PRIO_LOWEST,TIMER1_IRQHandler, 0); irq_enable(TIMER1_IRQn); The example is for TIMER1 but it is also tested for TIMER0. I am attaching "main.c".

Fullscreen 5417.main.c Download

#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>

#define PORT0_NI DT_NODELABEL(gpio0)
#define PORT1_NI DT_NODELABEL(gpio1)
const struct  device *port0 = DEVICE_DT_GET(PORT0_NI);
const struct  device *port1 = DEVICE_DT_GET(PORT1_NI);

#define LED_G 6
#define Out_1ms 10

bool F_500ms;
uint16_t Count_500ms;

// ôbsluha timer1 - dosiahlo porovnanie - 1 ms - 1kHz
void Timer1_1ms(void)
{
        NRF_TIMER1->EVENTS_COMPARE[0]=0;
        if(++Count_500ms>499)   // pol sekundy
        {
                Count_500ms=0;
                F_500ms=1;
                // prečítanie Timer4
                NRF_TIMER1->TASKS_CAPTURE[1]=1;
                Count_500ms=NRF_TIMER1->CC[1];
                printf("Timer1 = %d\n\r", Count_500ms);

                gpio_pin_toggle(port0,LED_G);
        }

}

// 1kHz = 1ms
void TIMER1_IRQHandler(void)
{
        if(NRF_TIMER1->EVENTS_COMPARE[0] != 0)
        {
             NRF_TIMER1->EVENTS_COMPARE[0]=0;  
             
             Timer1_1ms();
        }

        gpio_pin_toggle(port1, Out_1ms);       
}

void Start_Timer1(void)
{
        NRF_TIMER1->TASKS_CLEAR = 1;
        NRF_TIMER1->MODE = TIMER_MODE_MODE_Timer;
        NRF_TIMER1->SHORTS = TIMER_SHORTS_COMPARE0_CLEAR_Enabled;       // automaticky vynuluje TIMER4 po compare ???
        
        NRF_TIMER1->BITMODE = TIMER_BITMODE_BITMODE_16Bit;
        NRF_TIMER1->PRESCALER = 1;   // nie je možné použiť v Counter mode
        NRF_TIMER1->CC[0] = 8000;       // set value compare register 0 = 16MHz / 8000 / 2 = 1000 = 1kHz
        // NRF_TIMER1->CC[1] = 1000;       // set value compare register 1 - celkovo sú 5 alebo 6
        
        NRF_TIMER1->INTENSET = (TIMER_INTENCLR_COMPARE0_Enabled << TIMER_INTENCLR_COMPARE0_Pos);        // enable interrupt compare CC[0]

        // enable interrupt compare CC[0] + CC[1]
        // NRF_TIMER1->INTENSET = (TIMER_INTENCLR_COMPARE0_Enabled << TIMER_INTENCLR_COMPARE0_Pos) | (TIMER_INTENCLR_COMPARE1_Enabled << TIMER_INTENCLR_COMPARE1_Pos); 
        IRQ_DIRECT_CONNECT(TIMER1_IRQn, IRQ_PRIO_LOWEST, TIMER1_IRQHandler, 0);
        irq_enable(TIMER1_IRQn);
        // NVIC_EnableIRQ(TIMER1_IRQn);  // nastavenie prerušenia - nefunguje
        NRF_TIMER1->TASKS_START=1;
}

int main(void)
{
        gpio_pin_configure(port0, 6, GPIO_OUTPUT);
        gpio_pin_configure(port1, Out_1ms, GPIO_OUTPUT);
        gpio_pin_set(port0, LED_G, 0);
        gpio_pin_set(port1, Out_1ms, 0);
        
        Start_Timer1();
 
        while(1)
        {

        }

        return 0;
}

IRQ_DIRECT_CONNECT(TIMER1_IRQn, IRQ_PRIO_LOWEST, TIMER1_IRQHandler, 0);
irq_enable(TIMER1_IRQn);

nrf52840 Timer0 not work

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