NFC code not working

[Gordon]

Hi,

I'm trying to get NFC working on a PCA10040 dev board. Using the nfc/record_url hex file it works fine, so the hardware is obviously ok.

However, when I use the exact same code as in the record_url example from my software, it doesn't do anything. All functions execute without errors, but then log_uart_printf gets called with:

[NFC_HAL]: initialize
[NFC_HAL]: start
// ------------- put NFC device near 
[NFC_HAL]: fielddetected
[NFC_HAL]: reinitialize
[NFC_HAL]: fielddetected
[NFC_HAL]: fielddetected
[NFC_HAL]: reinitialize
[NFC_HAL]: fielddetected
[NFC_HAL]: reinitialize
[NFC_HAL]: fielddetected
[NFC_HAL]: reinitialize
[NFC_HAL]: fielddetected
[NFC_HAL]: fielddetected
[NFC_HAL]: fielddetected
[NFC_HAL]: fielddetected
[NFC_HAL]: reinitialize
[NFC_HAL]: fielddetected
[NFC_HAL]: reinitialize

Also, will the NFC code ever be distributed as something that's not a binary blob? I'm using a language interpreter (Espruino), and it expects functions to be compiled without hardware floating point (the call style is different). Currently the only way I can use NFC is to recompile with VFP, which means I'm then unable to pass floating point values into any functions!

[Hung Bui]

Hi Gordon,

Attached is an example to use record_url in other example (ble_app_hrm). I don't see any issue. Could you try ?

ble_app_hrs_URL_nfc - Copy.zip

[Gordon]

I changed the function to:

static inline void nrf_nfct_field_event_handler(volatile nfct_field_sense_state_t field_state)
{
    if (!m_field_on)
    {
        HAL_NFC_DEBUG_PIN_SET(HCLOCK_ON_PIN);  //DEBUG!
        
        bool was_running = nrf_drv_clock_hfclk_is_running();
        
        nrf_drv_clock_hfclk_request(&m_clock_handler_item);
        

        NRF_TIMER4->TASKS_CLEAR = 1;
        NRF_TIMER4->TASKS_START = 1;
        field_state_cnt = 0;
        
        if (was_running) nrf_nfct_clock_event_handler(NRF_DRV_CLOCK_EVT_HFCLK_STARTED);

        HAL_NFC_DEBUG_PIN_CLEAR(HCLOCK_ON_PIN);  //DEBUG!
    }
    m_field_on = true;
}

It works fine... Does that seem like a hack, or is it fine?