michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: entropy: nRF: clear NVIC pending before doing WFE on RNG IRQ

Browse source 
We need to clear the NVIC Pending bit for the RNG IRQ before
doing any WFEs and expect to wake up by RNG events. This is
because the event register will be set only if NVIC status
is changed from 0 to 1.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2020-06-11 18:01:58 +02:00 • committed by Carles Cufí
commit a182f74de9
1 changed files with 7 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

7
drivers/entropy/entropy_nrf5.c
View file

@ -278,6 +278,13 @@ static int entropy_nrf5_get_entropy_isr(struct device *dev, uint8_t *buf, uint16
nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);
nrf_rng_task_trigger(NRF_RNG, NRF_RNG_TASK_START);
/* Clear NVIC pending bit. This ensures that a subsequent
* RNG event will set the Cortex-M single-bit event register
* to 1 (the bit is set when NVIC pending IRQ status is
* changed from 0 to 1)
*/
NVIC_ClearPendingIRQ(IRQN);
do {
int byte;