k_sleep in microseconds duration is not precise

[nicolae.georgescu]

Hello,

We are triggering a pin for 50 microseconds but the actual time the pin is triggered as measured with an oscilloscope seems to vary around 150microseconds.

This is quite a difference. Is there anything we need to set for higher accuracy?

Code:

    nrf_gpio_pin_write(trigger, 1);

    k_sleep(K_USEC(50));

    nrf_gpio_pin_write(trigger, 0);

Thanks,
Geo

[Kenneth]

Using PWM is likely the way to go here yes, you may get some better accuracy using busy wait instead of k_sleep:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/kernel/services/threads/index.html#c.k_busy_wait 

Alternatively you can also use a TIMER with ppi to control a GPIOTE on compare events for exact timing control of pin.

Kenneth

[nicolae.georgescu]

Thanks for the answers!