[SoftDevice] Is there any limitation to call sd_clock_hfclk_release, when ADC

[xtting]

Hi,

I run ADC mudule together with SD, but go into hardfault eatch when I release the HF-clock.

Chip: 51822 SDK : 10.0-alpha IDE : Keil-472

I use this function to request the high frequence clock for ADC, befer the convertation

__INLINE void request_HFCLK_4_ADC ( void ) {
    uint32_t p_is_running = 0;
    
    sd_clock_hfclk_request();
    while(! p_is_running) {  							//wait for the hfclk to be available
        sd_clock_hfclk_is_running((&p_is_running));
    }
}

Then call

__INLINE void release_HFCLK_4_ADC ( void ) {
    //sd_clock_hfclk_release();
}

when ADC complete.

But the release funcion will always cause an hardfaul.

I wonder is there some limitition to use this API?

Thanks,

[Susheel Nuguru]

That is because if you do not set the priority to low then the default priority of your ADC interrupt is the highest. You cannot make SVC calls from priority higher than SVC priority, else it will hardfault.

take a loot at this thread.