Configure Uart serial for a custom board

[Aya2555]

I am trying to develop a project using a custom nrf52 board. The goal is to use the uart serial communication to receive and send the data via bluetooth. 

To do so I developed a sotfware and I tested on the nrf52-dk and it working well.

Now I want to port the soft to my custom bord. and to do so I need to descripe the uart pin. and I still didn't figure out how to do so.

[helsing]

Check out the documentation on Custom boards, including the Board Porting Guide.

If you navigate to the folder (...)\zephyr\boards\arm\nrf52dk_nrf52832 you will find the board files for nRF52 DK. The file nrf52dk_nrf52832-pinctrl.dtsi defines the pins used for the UART. The first number is the port, the second is the pin number of that port:

&pinctrl {
	uart0_default: uart0_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 6)>,
				<NRF_PSEL(UART_RX, 0, 8)>,
				<NRF_PSEL(UART_RTS, 0, 5)>,
				<NRF_PSEL(UART_CTS, 0, 7)>;
		};
	};

	uart0_sleep: uart0_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 0, 6)>,
				<NRF_PSEL(UART_RX, 0, 8)>,
				<NRF_PSEL(UART_RTS, 0, 5)>,
				<NRF_PSEL(UART_CTS, 0, 7)>;
			low-power-enable;
		};
	};
};

Please let me know if you have any further questions.

[helsing]

PS: You will need to change the pin number for both uart0_default and uart0_sleep.

[Aya2555]

thank you for the explanation !!

[ArvidBlaser]

Hi,

Is it possible to just comment away flow control RTS/CTS if they are not going to be used?

I'm having trouble to write debug messages from my custom board to an FTDI-uart-dongle. It works fine on the dk. Is there any common pitfalls that I can look into?

BR Arvid