Using multiple UARTs on nRF9160dk

RE: Using multiple UARTs on nRF9160dk

Håkon Alseth — Wed, 29 Jan 2020 07:47:52 GMT

Great to hear that its working now!

RE: Using multiple UARTs on nRF9160dk

Jagruti — Tue, 28 Jan 2020 15:36:25 GMT

Initially, I assigned rts and cts pins with Pin - 19 and 21, at that time it did not work. Now when I changed it to 0xFFFFFFFF, both UARTs started working together.

RE: Using multiple UARTs on nRF9160dk

Håkon Alseth — Tue, 28 Jan 2020 15:18:46 GMT

[quote user="Jagruti_N2A"]But when I connect the sensor, the data is not printed on the terminal. When I connect the sensor to UART_1 pins, the data is printed on the terminal. Does UART_2 also uses UART_0 for printing?[/quote]

printk() goes through uart0 by default.

Are you using the DK for testing, if yes, what pins are you using? The TXD pin is active low, while the RXD should float (ie: driven by the other side). If you measure it as high before attaching your external UART, its the TXD line.

RE: Using multiple UARTs on nRF9160dk

Jagruti — Tue, 28 Jan 2020 15:13:30 GMT

Yes, I have enabled UART2 in nrf9160_pca10090ns.overlay file. At tx-pin of UART_2 I can see the voltage also. But when I connect the sensor, the data is not printed on the terminal. When I connect the sensor to UART_1 pins, the data is printed on the terminal. Does UART_2 also uses UART_0 for printing?

RE: Using multiple UARTs on nRF9160dk

Håkon Alseth — Tue, 28 Jan 2020 15:07:04 GMT

Hi,

Have you enabled the UART2 in your overlay? This is done by creating a nrf9160_pca10090ns.overlay file in your application folder, which should contain (P0.10 and P0.11 chosen as an example here):

&uart2 {
	status = "okay";
	current-speed = <115200>;
	tx-pin = <11>;
	rx-pin = <10>;
	rts-pin = <0xFFFFFFFF>;
	cts-pin = <0xFFFFFFFF>;
};

Kind regards,

Håkon