UART unable to confiogure

RE: UART unable to confiogure

Håkon Alseth — Wed, 25 Sep 2024 09:38:40 GMT

Hi,

Glad to hear that you got it working!

If you want to change the pins, you can ask the AI, in the lower right corner.

For instance "show me how to change pins on uart1", and it'll give you a device tree overlay showing something like this:

&pinctrl {
   uart1_default_alt: uart1_default_alt {
      group1 {
         psels = <NRF_PSEL(UART_TX, 0, 14)>,
                 <NRF_PSEL(UART_RX, 0, 16)>;
      };
   };
   /* required if CONFIG_PM_DEVICE=y */
   uart1_sleep_alt: uart1_sleep_alt {
      group1 {
         psels = <NRF_PSEL(UART_TX, 0, 14)>,
                 <NRF_PSEL(UART_RX, 0, 16)>;
         low-power-enable;
      };
   };
};

&uart1 {
  pinctrl-0 = <&uart1_default_alt>;
  /* if sleep state is not used, use /delete-property/ pinctrl-1; and
   * skip the "sleep" entry.
   */
  pinctrl-1 = <&uart1_sleep_alt>;
  pinctrl-names = "default", "sleep";
};

Change this to the GPIO that you wanted.

Kind regards,

Håkon

RE: UART unable to confiogure

Nordic_Swapnil — Wed, 25 Sep 2024 09:35:07 GMT

YES ! i did the same thanks for support,
I observed that it is working for P0.06,P0.08 and P1.01,P1.02

latest 2.7 version sdk dont suggest pins, cant just random choose pins to configure

RE: UART unable to confiogure

Håkon Alseth — Tue, 24 Sep 2024 10:42:22 GMT

Hi,

[quote user="Nordic_Swapnil"]But I am still not getting output string, i had configured settings same as uart0 for uart1.[/quote]

You cannot enable both uart1 and uart0 on the same pins. one will need to be enabled on other pins, and you have to connect a external uart adapter to be able to communicate.

Kind regards,

Håkon

RE: UART unable to confiogure

Nordic_Swapnil — Tue, 24 Sep 2024 05:56:02 GMT

heyy Hakon,
I tried this step it had only eliminated the error and program is compiled successfully
But I am still not getting output string, i had configured settings same as uart0 for uart1.

RE: UART unable to confiogure

Håkon Alseth — Mon, 23 Sep 2024 16:47:28 GMT

Hi,

nRF52840 has two UARTE instances:

https://docs.nordicsemi.com/bundle/ps_nrf52840/page/uarte.html#d1676e397

The newer Cortex M33 based devices, such as nRF5340 and nRF91-series, they have up to 4 UART instances, which are shared with SPI and TWI.

If you want to use uart1, you have to enable it in device tree:

&uart1 {
    status = "okay";
};

Kind regards,

Håkon