nfct not working when i configure the hfclk

[[email protected]]

Hi, 

 In my project, I need turn on/off  the hfxo, I found when i configure the hfxo, the nfc is not working. Here is my code:

void gps_server_function(void *p1, void *p2, void *p3)

{

    msg_gps_type_t item;

    int ret;

    static bool gps_power_lock = false;

    while (true)

    {

        k_msgq_get(&gps_task_msgq, &item, K_FOREVER); // 等待消息

        switch (item)

        {

        case GPS_OPEN_LOCK:

            LOG_INF("open gps module");

            sim66md_power(1);

            gps_power_lock = true;

            nfc_t4t_emulation_stop();

            ret = clock_control_on(clock_dev, CLOCK_CONTROL_NRF_SUBSYS_HF);

            if (ret != 0)

            {

                LOG_INF("Failed to start HFCLK: %d", ret);

            }

            else

            {

                LOG_INF("HFCLK started successfully.");

                nfc_t4t_emulation_start();

            }

            break;

        case GPS_FETCH:

            sim66md_power(1);

            int ret = sim66md_get_rmc(&rmc_frame, 90);

            if (ret < 0)

            {

                rmc_frame.valid = false;

                LOG_ERR("can not get valid rmc message");

            }

            else

            {

                LOG_INF("coordinates: (%f,%f); speed: (%f);",

                        minmea_tocoord(&rmc_frame.latitude),

                        minmea_tocoord(&rmc_frame.longitude),

                        minmea_tofloat(&rmc_frame.speed));

            }

            if (gps_power_lock == false)

            {

                sim66md_power(0);

            }

            break;

        case GPS_CLOSE:

            LOG_INF("close gps module");

            sim66md_power(0);

            gps_power_lock = false;

            clock_control_off(clock_dev, CLOCK_CONTROL_NRF_SUBSYS_HF);

            LOG_INF("HFCLK stopped.");

            break;

        default:

            break;

        }

    }

}

[Sigurd]

Hi!

I see you have this in the code:

        case GPS_CLOSE:
            LOG_INF("close gps module");
            sim66md_power(0);
            gps_power_lock = false;
            clock_control_off(clock_dev, CLOCK_CONTROL_NRF_SUBSYS_HF);
            LOG_INF("HFCLK stopped.");
            break;

If you remove, "clock_control_off(clock_dev, CLOCK_CONTROL_NRF_SUBSYS_HF);" line, does the nfc work as expected then?

[[email protected]]

Here is my updated code, it still have same problem

void gps_server_function(void *p1, void *p2, void *p3)

{

    msg_gps_type_t item;

    int ret;

    static bool gps_power_lock = false;

    while (true)

    {

        k_msgq_get(&gps_task_msgq, &item, K_FOREVER); // 等待消息

        switch (item)

        {

        case GPS_OPEN_LOCK:

            LOG_INF("open gps module");

            sim66md_power(1);

            gps_power_lock = true;

            nfc_t4t_emulation_stop();

            ret = clock_control_on(clock_dev, CLOCK_CONTROL_NRF_SUBSYS_HF);

            if (ret != 0)

            {

                LOG_INF("Failed to start HFCLK: %d", ret);

            }

            else

            {

                LOG_INF("HFCLK started successfully.");

            }

            break;

        case GPS_FETCH:

            sim66md_power(1);

            int ret = sim66md_get_rmc(&rmc_frame, 90);

            if (ret < 0)

            {

                rmc_frame.valid = false;

                LOG_ERR("can not get valid rmc message");

            }

            else

            {

                LOG_INF("coordinates: (%f,%f); speed: (%f);",

                        minmea_tocoord(&rmc_frame.latitude),

                        minmea_tocoord(&rmc_frame.longitude),

                        minmea_tofloat(&rmc_frame.speed));

            }

            if (gps_power_lock == false)

            {

                sim66md_power(0);

            }

            break;

        case GPS_CLOSE:

            LOG_INF("close gps module");

            sim66md_power(0);

            gps_power_lock = false;

            nfc_t4t_emulation_start();

            clock_control_off(clock_dev, CLOCK_CONTROL_NRF_SUBSYS_HF);

            LOG_INF("HFCLK stopped.");

            break;

        default:

            break;

        }

    }

}

[Sigurd]

Hi!

Could you try to explain what you are trying to do here? Why start NFC and stop HFXO on case GPS_CLOSE?

Also did you call e.g. nfc_t4t_setup() ?

You should also check the return code from nfc_t4t_emulation_start() and nfc_t4t_emulation_stop().

e.g.

int err;

err = nfc_t4t_emulation_start();
if (err) {
LOG_ERR("Failed to start NFC T4T emulation, (err: %d)", err);
}

[[email protected]]

Due to low power requirements, I need to dynamically enable and disable HFXO. When I turn on the GPS, I enable HFXO, and before enabling HFXO, I disable the NFC function to prevent NFC from being in an unknown state after switching to HFXO. Before turning off HFXO, I first restore the NFC functionality. Additionally, nfc_t4t_emulation_start always returns successfully as long as it is not called repeatedl

[[email protected]]

I also noticed that the function nfct_field_timer_config(uint8_t irq_priority) at line 383 in the file D:\Nordic\v2.5.1\modules\hal\nordic\nrfx\drivers\src\nrfx_nfct.c uses timer2. When I change the HFCLK clock source, it should affect timer2, which could lead to NFC not functioning properl

static inline nrfx_err_t nfct_field_timer_config(uint8_t irq_priority)
{
    nrfx_err_t err_code;
    nrfx_timer_config_t timer_cfg = NRFX_TIMER_DEFAULT_CONFIG(FIELD_TIMER_FREQUENCY_HZ);
    timer_cfg.interrupt_priority = irq_priority;

    err_code = nrfx_timer_init(&m_timer_workaround.timer,
                               &timer_cfg,
                               nfct_field_timer_handler);
    if (err_code != NRFX_SUCCESS)
    {
        return err_code;
    }

    nrfx_timer_extended_compare(&m_timer_workaround.timer,
                                NRF_TIMER_CC_CHANNEL0,
                                nrfx_timer_us_to_ticks(&m_timer_workaround.timer,
                                                       NRFX_NFCT_TIMER_PERIOD),
                                NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
                                true);
    return err_code;
}