how to use uart1 uart2 uart3 on nRF5340? uart0 is ok for console

RE: how to use uart1 uart2 uart3 on nRF5340? uart0 is ok for console

Jared — Thu, 19 Oct 2023 14:10:05 GMT

Hi,

The error log that you shared in the problem statement indicates that the issue is with the definition of the label 'uart2_default, where in the overlay do you define this?

[quote user="upupsky"]but in net core default uart0 is same with uart1 in app core (in the file "nrf5340_cpunet_common-pinctrl.dtsi)[/quote]

These pins are forwarded to the netcore by default, if you want to use them then you have to disable the forwarding by deleting the node in the overlay.

regards

Jared

RE: how to use uart1 uart2 uart3 on nRF5340? uart0 is ok for console

upupsky — Thu, 19 Oct 2023 01:05:26 GMT

uart1 use the default in app core (in the file "nrf5340_cpuapp_common-pinctrl.dtsi)

uart1_default: uart1_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 1)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 1, 0)>;
			bias-pull-up;
		};
	};

	uart1_sleep: uart1_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 1)>,
				<NRF_PSEL(UART_RX, 1, 0)>;
			low-power-enable;
		};
	};

but in net core default uart0 is same with uart1 in app core (in the file "nrf5340_cpunet_common-pinctrl.dtsi)

uart0_default: uart0_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 1)>,
				<NRF_PSEL(UART_RTS, 0, 11)>;
		};
		group2 {
			psels = <NRF_PSEL(UART_RX, 1, 0)>,
				<NRF_PSEL(UART_CTS, 0, 10)>;
			bias-pull-up;
		};
	};

	uart0_sleep: uart0_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 1)>,
				<NRF_PSEL(UART_RX, 1, 0)>,
				<NRF_PSEL(UART_RTS, 0, 11)>,
				<NRF_PSEL(UART_CTS, 0, 10)>;
			low-power-enable;
		};
	};

RE: how to use uart1 uart2 uart3 on nRF5340? uart0 is ok for console

Jared — Wed, 18 Oct 2023 10:43:32 GMT

Hi,

What pins are you using for each uart?

regards

Jared