Reading the output pin value

RE: Reading the output pin value

nikitag — Tue, 16 Aug 2022 13:28:36 GMT

Thank you!

RE: Reading the output pin value

Kenneth — Tue, 16 Aug 2022 13:13:13 GMT

[quote user="nikitag"]Can we use nrf_gpio_pin_out_read in this case?[/quote]

Sure, but make sure to look at the implementaton of each of the calls you are making and read the GPIO chapter I linked so you can understand what each of them do, ref:
https://github.com/NordicSemiconductor/nrfx/blob/v1.9.0/hal/nrf_gpio.h
https://infocenter.nordicsemi.com/topic/ps_nrf52840/gpio.html#register.OUT

Kenneth

RE: Reading the output pin value

nikitag — Tue, 16 Aug 2022 12:56:55 GMT

Yes. I want to read the value of OUTPUT GPIO pin that I have written. But I have found that nrf_gpio_pin_out_read gives me back incorrect value. I am trying to figure out whether my flow is correct, because we use nrf_gpio_pin_write -> nrf_gpio_pin_set -> nrf_gpio_port_out_set to set the value of the pin and nrf_gpio_pin_out_read to read the state of the output pin. Is it correct? Can we use nrf_gpio_pin_out_read in this case?

RE: Reading the output pin value

Kenneth — Tue, 16 Aug 2022 12:51:30 GMT

I am not entirely sure what you want to do here, since you are basically reading back the register you just set, but yes.

Kenneth

RE: Reading the output pin value

nikitag — Tue, 16 Aug 2022 12:45:32 GMT

As I understand, nrf_gpio_pin_out_read can be used only if nrf_gpio_port_out_write is used. Am I right?

RE: Reading the output pin value

Kenneth — Tue, 16 Aug 2022 12:05:39 GMT

You can read the difference between OUT and OUTSET here:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/gpio.html#register.OUT

For instance notice the "Write: a '1' sets the pin high; a '0' has no effect" for OUTSET.

Kenneth