how to get real gpio high/low

RE: how to get real gpio high/low

user116085 — Mon, 13 Jun 2022 05:28:27 GMT

Hi Edvin,

I have tested the experience and it is workable.

sample code:

nrf_gpio_cfg_output(NRF_GPIO_PIN_MAP(1, 0));
nrf_gpio_pin_set(NRF_GPIO_PIN_MAP(1, 0));

nrf_gpio_cfg_input(NRF_GPIO_PIN_MAP(1, 1), NRF_GPIO_PIN_PULLDOWN);

// connect P1.00 and P1.01
value = nrf_gpio_pin_read(NRF_GPIO_PIN_MAP(1, 1)); // high

Thank you

Best regards,

Gavin

RE: how to get real gpio high/low

user26071 — Tue, 07 Jun 2022 07:42:13 GMT

Hello Gavin,

[quote user="panpgg"]

Could I use nrf_gpio_pin_read() to read P1.01 high/low ? Is the answer high ?

[/quote]

Did you try?

It should be possible to do so.

Best regards,

Edvin

RE: how to get real gpio high/low

user116085 — Mon, 06 Jun 2022 02:03:12 GMT

Hi Edvin,

Thanks for the response. One more question.
There are two gpios. For example, one is P1.00, the other is P1.01.

If I set P1.00 as output high and P1.01 as input/no pull.
Then, short P1.00 and P1.01.

Could I use nrf_gpio_pin_read() to read P1.01 high/low ? Is the answer high ?

Best Regards,

Gavin

RE: how to get real gpio high/low

user26071 — Thu, 02 Jun 2022 12:56:24 GMT

Hello,

If you have configured it as an output pin, so when you short it to GND, you just make a circuit from VDD to GND drawing current (if you put an LED in between it would light up).

If you want to use it to check for high or low, you need to configure it as an input pin instead of an output pin. nrf_gpio_cfg_input() instead of nrf_gpio_cfg_output();

FYI: A common thing to do is to set up an event handler/button handler to trigger an interrupt when a button is pressed. You can look into one of the example using button handlers to see how you can do that, such as the SDK\examples\peripheral\bsp.

Best regards,

Edvin