NRF5340 GPIO Interrupt and low power problem.

RE: NRF5340 GPIO Interrupt and low power problem.

u9357 — Wed, 19 Apr 2023 11:03:59 GMT

My interrupt handler releases a semaphore which i wait for inside the main thread. If latency is set to zero, CPU will keep sleeping until k_sem_take() times out. At which point it is executing the ISR and then starts executing my application code. I've verified this by recordingj the time of execution of ISR and k_sem_take() return, with k_uptime_get(). There is less than 1ms difference.

RE: NRF5340 GPIO Interrupt and low power problem.

u9357 — Wed, 19 Apr 2023 10:25:54 GMT

In my case after calling gpio_pin_interrupt_configure_dt() current increases by 300uA but if i set latency to 0, interrupts stops working.

RE: NRF5340 GPIO Interrupt and low power problem.

Jørgen Holmefjord — Tue, 23 Mar 2021 16:20:58 GMT

Hi,

nRF5340 has a new LATENCY register that will affect the current consumption of the GPIOTE peripheral, see Low power.

I cannot see that this is set in the GPIO driver in Zephyr.

Can you test if forcing it to LowPower affects the current, by setting the following after gpio_pin_interrupt_configure():

NRF_GPIOTE->LATENCY = 0;

Best regards,
Jørgen