Zephyr, nrf5340 and pin number

RE: Zephyr, nrf5340 and pin number

Jørgen Holmefjord — Thu, 31 Mar 2022 08:51:36 GMT

Hi,

This looks like a good approach, it is quite similar to the helper macros defined in the nrf9160dk_nrf52840 board file.

Best regards,
Jørgen

RE: Zephyr, nrf5340 and pin number

Riccardo Gaiati — Wed, 30 Mar 2022 11:17:28 GMT

Hi,

i came out with this approach:

#define GPIO_PORT(pin)    DT_PROP_BY_PHANDLE_IDX(DT_NODELABEL(pin), gpios, 0, port)
#define GPIO_PIN(pin)     DT_GPIO_PIN(DT_ALIAS(pin), gpios)
#define GPIO_ABS_PIN(pin) NRF_GPIO_PIN_MAP(GPIO_PORT(pin), GPIO_PIN(pin))

where pin is the label used (in bold) in the device tree file (see below).

leds {

compatible = "gpio-leds";

led0: led_0 {

gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;

label = "Green LED 0";

};

RE: Zephyr, nrf5340 and pin number

Riccardo Gaiati — Tue, 29 Mar 2022 09:50:32 GMT

Could you please elaborate with an example when you say 'for pins on P1, you can use gpio1 in the devicetree.'.

thanks in advance !

RE: Zephyr, nrf5340 and pin number

Riccardo Gaiati — Tue, 29 Mar 2022 09:43:41 GMT

Hi Jørgen,

i just tried to run quickly an example project where the led0 is configured in the device tree in this way:

leds {

compatible = "gpio-leds";

led0: led_0 {

gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;

label = "Green LED 0";

};

So the absolute pin number is 32 + 7 = 39

The macro

#define INPUT_PIN DT_GPIO_PIN(DT_ALIAS(led0), gpios)

has a value of 7 instead. So the port number is not considered.

RE: Zephyr, nrf5340 and pin number

Riccardo Gaiati — Tue, 29 Mar 2022 09:19:50 GMT

Hi Jørgen. Thanks for the reply. I saw this example. The point is that both the pins used here are on the GPIO port 0. I was wondering if those macro works properly even when the pin belong to GPIO port 1. Does it ? Since im interested in the absolute value of the pin, so port_number * 32 + pin_number.

RE: Zephyr, nrf5340 and pin number

Jørgen Holmefjord — Tue, 29 Mar 2022 08:57:56 GMT

Hi,

There is an existing example in nRF Connect SDK/Zephyr that shows how to use the GPIOTE and PPI peripherals using nrfx drivers.

These lines shows how you can get the GPIOs from the devicetree, for pins on P1, you can use gpio1 in the devicetree.

Best regards,
Jørgen