nrf52810 SAADC + interrupt without HAL

RE: nrf52810 SAADC + interrupt without HAL

haakonsh — Wed, 12 Aug 2020 12:27:17 GMT

[quote user="jca"]libraries must not be used[/quote]

You need to use the HAL in order to operate the nRF52 safely, for instance:

__STATIC_INLINE void nrf_saadc_event_clear(nrf_saadc_event_t event)
{
    *((volatile uint32_t *)((uint8_t *)NRF_SAADC + (uint32_t)event)) = 0x0UL;
#if __CORTEX_M == 0x04
    volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)NRF_SAADC + (uint32_t)event));
    (void)dummy;
#endif
}

That dummy read is necessary, see Migrating from the nRF51 Series to the nRF52 Series -> Functional changes.

RE: nrf52810 SAADC + interrupt without HAL

jca — Wed, 12 Aug 2020 12:13:03 GMT

It doesn't work. I have a project where bluetooth is used and due to the size of the softdevice, all logs must be turned off and libraries must not be used.

RE: nrf52810 SAADC + interrupt without HAL

haakonsh — Wed, 12 Aug 2020 11:35:11 GMT

Try to use nrf_saadc_event_clear instead of NRF_SAADC->EVENTS_END = 0;

RE: nrf52810 SAADC + interrupt without HAL

jca — Wed, 12 Aug 2020 10:55:52 GMT

I start the measurement by software.

In interrupt the flag is cleared.:

void SAADC_IRQHandler(void)
{
    if(NRF_SAADC->EVENTS_END > 0)
   {
       NRF_SAADC->EVENTS_END = 0;

RE: nrf52810 SAADC + interrupt without HAL

haakonsh — Wed, 12 Aug 2020 10:48:46 GMT

[quote user=""] An END interrupt is triggered only once. [/quote]

Have you remembered to clear it after it has fired?