Softdevice stucks when using external crystal

[Marek Zak]

Hi, I'm developing app using nrf51822. I want to use BT, but my program stops working (stucks) on softdevice setup. I'm using external 32 MHz crystal. I will be happy for any advice. I attach scheme and code sample. The same code (except frequency setting - used 16 MHz insted of 32 MHz) is running ok on dongle.

Thanks Marek

Crystal I'm using

 static void ble_stack_init(void)
 {
    uint32_t err_code;
    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false); <-- here program stucks
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
 }

int main(void)
{
        NRF_CLOCK->XTALFREQ = 0x0;
        NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
        NRF_CLOCK->TASKS_HFCLKSTART = 1;
        while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) {}
    
        timers_init();
        gpiote_init();
        bond_manager_init();
        ble_stack_init(); <-- here is called SOFTDEVICE_HANDLER_INIT
        gap_params_init();
        advertising_init();
        alert_notification_init();
}

[thomas]

Hi,

Evaluation board and dongle have a High frequency crysal AND a low frequency crystal. Low freq can be internal synthesized ( and you need just the external 16Mhz quartz). To do this you have to change this define :

//#define NRF_CLK_SRC										NRF_CLOCK_LFCLKSRC_XTAL_20_PPM			//Pour EV Board
 #define NRF_CLK_SRC										NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM 		//Pour proto & EV Board

[Michal Zacharias]

Hey, I'm Mark's coworker. This NRF_CLK_SRC is something different than first parameter of this function?

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);

[flynnnn]

thanks! I use external 32MHz crystal,my test run vell,but when I add device_manager_init ,it stucks! why?

[Nguyen Hoan Hoang]

You don't have the 32KHz crystal. Use the RC oscillator to init the softdevice instead.

NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION

The default examples all use NRF_CLOCK_LFCLKSRC_XTAL_20_PPM which make use of the 32KHz crystal.

[Nguyen Hoan Hoang]

The init order may be a different. Try to put service_init before device_manager_init.