nrf5-calendar-example SOFTDEVICE: INVALID MEMORY ACCESS

[snowuyl]

I try to integrate https://github.com/NordicPlayground/nrf5-calendar-example into Keil project. But the following error messages shown when accessing NRF_CLOCK.

error messages

nrf5-calendar-example SOFTDEVICE: INVALID MEMORY ACCESS

source code

int main(void) {
    _initVariables();
    

    // Initialize.
    log_init(); // Power_saving
    uart_init(); // Power_saving
    //_showInfo();
    fstorageInit();
    batteryVoltageInit();
    timerInit();
    button_events_init();
    scheduler_init();
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    db_discovery_init();
    services_init();
    advertising_init();
    conn_params_init();
    timerPeriodStart();
    timerStart();
    

    //  SOFTDEVICE: INVALID MEMORY ACCESS occurred when running the following code
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_HFCLKSTART = 1;
    while(NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
    
     nrf_cal_init();
     nrf_cal_set_callback(calendar_updated, 4);

}

[Vidar Berg]

You don't need to start the LF clock either as the Softdevice does it when you enable it. So uou can remove this from cal_init():

    NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos;
    NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_LFCLKSTART = 1;
    while(NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);

[snowuyl]

I have removed NRF_CLOCK related code from nrf_cal_init().Do you have any suggestion about how to change CAL_RTC related code to Softdevice APIs?

void nrf_cal_init(void) {
    NRF_LOG_DEBUG("nrf_cal_init() e\n");
    
    // Configure the RTC for 1 minute wakeup (default)
    CAL_RTC->PRESCALER = 0xFFF;
    CAL_RTC->EVTENSET = RTC_EVTENSET_COMPARE0_Msk;
    CAL_RTC->INTENSET = RTC_INTENSET_COMPARE0_Msk;
    CAL_RTC->CC[0] = m_rtc_increment * 8;
    CAL_RTC->TASKS_START = 1;

}

[Vidar Berg]

Yes, RTC0 is reserved to the Softdevice as well, so you need to select another RTC instance.

In nrf_calendar.h, change:

// Change the following defines to change the RTC timer used or the interrupt priority
#define CAL_RTC                 NRF_RTC0
#define CAL_RTC_IRQn            RTC0_IRQn
#define CAL_RTC_IRQHandler      RTC0_IRQHandler
#define CAL_RTC_IRQ_Priority    3

To:

// Change the following defines to change the RTC timer used or the interrupt priority
#define CAL_RTC                 NRF_RTC2
#define CAL_RTC_IRQn            RTC2_IRQn
#define CAL_RTC_IRQHandler      RTC2_IRQHandler
#define CAL_RTC_IRQ_Priority    6

[snowuyl]

Thanks for your suggetion. I have changed nrf_calendar.h as follows.

// Change the following defines to change the RTC timer used or the interrupt priority
#define CAL_RTC                 NRF_RTC2
#define CAL_RTC_IRQn            RTC2_IRQn
#define CAL_RTC_IRQHandler      RTC2_IRQHandler
#define CAL_RTC_IRQ_Priority  

[Vidar Berg]

Are you still getting the assert, or does it work now?