Can't enable timer on nRF52840 DK

RE: Can't enable timer on nRF52840 DK

Andre — Wed, 23 May 2018 08:06:53 GMT

Have a look at the interrupt priorities of the timer and the twi. is the timer Interrupting the twi transfer?

RE: Can't enable timer on nRF52840 DK

apdobaj — Tue, 22 May 2018 21:56:05 GMT

it appears that the TWIM interface is stuck here (but only after that 3rd line in nrfx_timer_enable is run):

        while (!nrf_twim_event_check(p_twim, evt_to_wait))
        {
            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
            {
                NRFX_LOG_DEBUG("TWIM: Event: %s.", EVT_TO_STR_TWIM(NRF_TWIM_EVENT_ERROR));
                nrf_twim_event_clear(p_twim, NRF_TWIM_EVENT_ERROR);
                nrf_twim_task_trigger(p_twim, NRF_TWIM_TASK_RESUME);
                nrf_twim_task_trigger(p_twim, NRF_TWIM_TASK_STOP);
                evt_to_wait = NRF_TWIM_EVENT_STOPPED;
            }
        }

should i try to get TWIM to use the scheduler?

RE: Can't enable timer on nRF52840 DK

Andre — Tue, 22 May 2018 19:43:00 GMT

And I assume it is also enabled in nrfx_config.h ?

However, i see a strange thing, that you use the line

HESA_TIMER->TASKS_START = 1;

As this would be used when setting the registers manually, but in the rest of your code, you have the SDK manage it for you. Setting the hardware in some state manually might confuse the SDK code, however, as you report the error occurs in a line before this line, this would not be the cause of the issue.

Also, by the code crashes, you mean you're entering a HardFault? Looking at that line, getting a HardFault there would suggest you're feeding the function an invalid parameter. Can you verify if the p_instance in nrfx_timer_enable is correct?

RE: Can't enable timer on nRF52840 DK

apdobaj — Tue, 22 May 2018 18:41:14 GMT

further up in that same file

#define HESA_TIMER_ID 1
#define TIMER_HESA_CONFIG_IRQ_PRIORITY 6

const nrfx_timer_t hesa_timer_instance = NRFX_TIMER_INSTANCE(HESA_TIMER_ID);

RE: Can't enable timer on nRF52840 DK

Andre — Tue, 22 May 2018 18:15:06 GMT

Where and how is hesa_timer_instance defined and initialised?

RE: Can't enable timer on nRF52840 DK

apdobaj — Tue, 22 May 2018 17:55:23 GMT

I have the NRFX timer, the NRF timer, NRFX power, NRF power, app timer (I'm also using a LF timer) - anything else need to be enabled?

RE: Can't enable timer on nRF52840 DK

RichieJH — Tue, 22 May 2018 17:43:50 GMT

Have you enabled the module in sdk_config.h?